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ProtoDUNE dual-phase planning Dario Autiero (IPNL Lyon) LBNC meeting April 29, 2016 WA105 Dual-Phase ProtoDUNE DUNE

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Page 1: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

ProtoDUNE dual-phase planning

Dario Autiero (IPNL Lyon)

LBNC meeting

April 29, 2016

WA105

Dual-Phase ProtoDUNE

DUNE

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January 2016 LBNC questions/recommendations: Written answers summarized below content addressed in the slides of this talk

1) No details of the Photon Detection System for the Dual Phase were given. Could the

system proposed for the single-phase design be used (or vice versa), and would this save

effort/resource?

The light readout system is described in the WA105 TDR and in the DUNE CDR. It is based on

8” Hamamatsu R5912mod02 cryogenic photomultipliers with TPB coating. The use of this

system, which provides satisfying efficiency at low energy (5 MeV) in the 10 kton DP modules,

is made possible by the geometrical arrangement of the double phase readout with available

space below the transparent cathode at the bottom of the detector.

2) Possible interference was noted with the installation and commissioning of the test beams

in the beam hall.

There is no interference since the beam line is isolated from the detector with a beam stopper

and the commissioning, mostly performed without beam, is not supposed to interfere with the

detector construction. Some positive interference is desirable for the calibration/shape study

of the electron energy spectrum in presence of passive materials. This calibration can be

performed at the end of the beamline and after the beam plug inside the cryostat by exposing

a lead glass calorimeter. The exposure inside the detector will only be possible during the

construction period so matching this beam commissioning period.

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3) Common elements between the Dual and Single-phase prototypes were shown in the

earlier talks on ProtoDune. Maximizing the number of common elements between the two

designs will make it easier to meet schedule/cost goals for both sub-projects.

Indeed synergies on several items are being developed, as summarized in the specific slide

of this talk. A complete description is provided in the SPSC report (SPSC-SR-184). A joint SP-

DP meeting week was organized on that sense during the week of February 22nd. A dedicated

meeting on the field cage design and construction synergy was held yesterday at CERN.

4) Very little time exists between the scheduled first operation of the 3x1x1m detector and the

finalization of the design for the Dual Phase Dune Prototype.

The design of the 6x6x6 is going to be finalized by July 2016. It does not depend on the

operation of the 3x1x1. The 3x1x1 program was very useful in order to perform all the

developments and tests of the several detector elements, bringing them to a very advanced

stage of prototyping, such as: the cryostat and its steel structure; the cryogenic system; the

slow control system; the signal chimneys; the penetration flanges; the LEM procurement and

QA chain; the Charge Readout Plane mechanics and its suspension system.

Most of these elements, which were validated by dedicated test benches, will be also

deployed on the 6x6x6. The design of specific elements for the 6x6x6 evolving from the 3x1x1

design, such as the 3x3 CRP structure design, needed dedicated cold bath tests, independent

from the 3x1x1 operation. The 3x1x1 will allow testing a downscaled version of the online

storage and processing system, useful to optimize the design of the final system to be

deployed on the 6x6x6. In this case there is a direct connection with the design finalization.

However the online storage/processing system for the 6x6x6 is expected to be installed at

the beginning of 2018. In general there are no interferences, apart constructive synergies,

among the time schedules of the 3x1x1 and of the 6x6x6.

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5) A manpower loaded schedule should be developed to make sure that personnel exist and

are being properly deployed to deliver the overall schedule.

The dual-phase ProtoDUNE schedule is manpower and resources loaded following the

commitments already defined at the level of the WA105 MOU in 2015. The installation

schedule and resources manpower counting are detailed in the project planning chart and

in the related excel files, which can be provided if needed. We are in the process of

integrating the DP ProtoDUNE schedule within the DUNE PM tools (Primavera).

6) Project management should understand and report how operations of the 3x1x1 pilot

detector will contribute to the design of the Dual Phase prototype and what this implies for

the schedules of the two elements of the project.

As described in answer (4), the design of the 6x6x6 is not supposed to be affected by the

operation of the 3x1x1 pilot. Completely unexpected problems at the level of the 3x1x1

operation would imply a whole rethinking of the design and radical changes. On the

contrary the 3x1x1 program was intended as a technological catalyst in order to speed up

the production of final elements for the 6x6x6 well in advance of time. A typical, “historical”,

example was the 3x1x1 cryostat and the related steel structure which allowed CERN to sort

out all the legal problems and to set up the collaboration agreement with GTT for the

construction of the cryostats for the ProtoDUNEs and the DUNE 10 kton modules. Other

examples concern the cryogenic system and the design and procurement of the LEM and

the signal penetrations.

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Dual-phase readout: Long drift, high S/N: extraction of electrons from the liquid and multiplication with avalanches in

pure argon within micro-pattern detectors like LEM (Large Electron Multipliers)

Tunable gain (~20 minimum), two symmetric collection views, coupling to cold electronics

Drift field 0.5-1 kV/cm

Extraction field 2 kV/cm

Collection field 5 kV/cm

Anode 0V

Grid

2 mm

1 cm

LAr

GAr

LEM (1mm)

25-35 kV/cm

Anode PCB

500 um holes

800 um pitch

Avalanches in LEM holes

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Advantages of double-phase design:

• Anode with 2 collection (X, Y) views (no induction views), no ambiguities

• Strips pitch 3.125 mm, 3 m length

• Tunable gain in gas phase (20-100), high S/N ratio for m.i.p. > 100, <100 KeV

threshold, min. purity requirement 3ms operative margins vs purity, noise

• Long drift projective geometry: reduced number of readout channels

• No materials in the active volume

• Accessible and replaceable cryogenic FE electronics, high bandwidth low cost

external uTCA digital electronics

Dual-phase 10 kton

FD module

80 CRP units

60 field shaping

rings

240 signal FT

chimneys

240 suspension

chimneys

180 PMTs

153600 readout

channels

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WA105 Technical Design Report:

TDR

submitted on 31st March 2014

CERN-SPSC-2014-013

SPSC-TDR-004(2014)

2015 Annual SPSC progress

report 31st March 2015

SPSC-SR-158

WA105 project MOU fully

signed, December 2015

History of Dual-Phase ProtoDUNE / WA105

Project started in 2013 (CERN RB

approval) following the submission

of LBNO Expression of Interest

Collaborators from 10 countries

and 22 institutes

7

Integration in DUNE project as DP-ProtoDUNE

December 2015; EOI call for ProtoDUNEs, January 2016

2016 Annual SPSC progress

report, 7th April 2016

CERN-SPSC-2016-017

SPSC-SR-184

DUNE CDR, July 2015:

WA105 and Dual-phase

10 kton design

Page 8: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

The Dual-Phase ProtoDUNE/WA105 6x6x6 m3 detector is built out of the same 3x3m2 Charge Readout Plane units (CRP) foreseen for the 10 kton Dual-Phase DUNE Far Detector (same QA/QC and installation chains)

WA105: 4 CRP

6 m

6 m

10 kton: 80 CRP

60 m 6 m

12 m

8

Page 9: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

WA105 Accessible cold front-end electronics and uTCA DAQ system 7680 ch

Cryogenic ASIC amplifiers (CMOS 0.35um)

16ch externally accessible:

• Working at 110K at the bottom of the signal

chimneys

• Cards fixed to a plug accessible from outside

Short cables capacitance, low noise at low T

Digital electronics at warm on the tank deck: • Architecture based on uTCA standard

• 1 crate/signal chimney, 640 channels/crate

12 uTCA crates, 10 AMC cards/crate, 64 ch/card

9

ASICs 16 ch. (CMOS 0.35 um)

Full accessibility provided by the double-phase charge readout at the top of the detector

uTCA crate

Signal chimney

CRP

Warm

Cold

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Progress on WA105 DLAr detector 6x6x6 m3:

Membrane vessel design and procurement

Cryogenics

Charge Readout Plane (CRP) detectors

CRP structure and hanging system

Feedthroughs

HV and field cage

Charge readout FE electronics + digital electronics

Light readout system + electronics

DAQ and online processing

Slow Control

Advanced state of

design, prototyping and

production preparation

For many items huge

benefit from immediate

application of a smaller

3x1 prototype LAr-proto

(minimal size of RO unit

in 6x6x6)

Fully engineered versions of many

detector components with pre-

production and direct implementation

(installation details and ancillary

services)

First overview of the complete system

integration: set up full chains for QA,

construction, installation, commissioning

Anticipate legal and practical aspects

related to procurement, costs and

schedule verification

Dedicated weekly meeting to follow up

construction progress

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cryostat

detector assembly

structure

clean room

11

detector assembly

structure

clean

room

cryostat

WA105 tests infrastructure in Building 182

3x1x1 cryostat

(17 m3)

Clean room for LEM tests +

CRP production and assembly

3x1x1 detector

Top-cap assembly

structure

3x1 cabling

Page 12: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

Being assembled now in Bdg 182 ! Cryogenic operation in September

Topcap and detector assembly

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Full design, prototyping and integration of WA105 feedthroughs/chimneys

Design of slow control/services

feedthroughs

CRP hanging system feedthroughs

and motorization system (adjust CRP

distance and parallelism to LAr level)

Cathode HV

feedthrough

Studied and

implemented

in 3x1

TopCap

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WA105 Slow Control (PCS/DCS/DSS)

Fully engineered system designed

for 3x1 as building block easy to

extrapolate to 6x6 in collaboration

with CERN PH-DT

Based on National Instruments

compact RIO modules + UNICOS

supervisor + single LabView

interface

Integrates controls of level meters,

temperature and pressure sensors,

strain gauges, cryocamera + safety

Cryocamera

3x1 CRP sensors instrumentation (highly redundant)

High accuracy (100 um)

and standard (1 mm) level meters

SC

Test rack

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Light readout

3x1x1: mechanical supports for PMTs +

different TPB coating options implemented

Single coax for HV+signals

Development prototype of uTCA light readout

digitization boards based on Bittware S4AM, 9

channels/card, 36 PMTs in 6x6x6

Trigger from PARISCROC2 ASIC:

mezzanine card produced

Hamamatsu R5912-02mod PMTs +

TPB coating, at the bottom of the tank

below cathode, minimal: 1 PMT/4m2

10 kton ~100% efficiency at 200 MeV

>50% efficiency at 5 MeV (conservative)

Larger efficiency achievable with more PMTs

coverage, e.g: 1 PMT/1m2 as tested in

WA105

PARISROC

mezzanine

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WA105 6x6x6 timeline

16

WA105 6x6x6 plans are integrated in the official EHN1 schedule The critical path is defined by availability of infrastructure (clean room in Bld 185, cryostat, cryogenics) provided by Neutrino Platform

Cryostat ready for detector installation

Jul 2016

Sep 2016

Mar 2017

Apr 2017

Start of cryostat construction

Cryogenics ready

Final design of detector elements

All CRPs assembled Ready for installation

CRPs installed & cabled

Detector fully installed and cabled

Aug 2017

Dec 2017

… Jan

2018 Feb

2018 Mar

2018 Apr

2018

TCO & cryostat sealed

Beam data

Start cryogenic operation & detector commissioning

Ready to start beam data taking

EHN1 infrastructure milestones

First cosmics

In a year from now

Jan 2017

Clean room for CRP assembly Bld 185

… … …

Start CRP assembly

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Definition of beam line

instrumentation (TOF, triggers,

beam profile and spectrometer,

Cerenkov common work also

with single-phase group to define

and procure the missing

hardware. In particular to set up a

performant TOF system (~20ps

resolution, on 18 m lever arm)

Synergy with SP in definition of

beam window/beam plug in non

active LAr volume

H2-VLE beamline Tertiary beam on H2 beamline:

1-12 GeV/c, momentum bite 5% (can be reduced

to 1% with integrated spectrometer

measurements)

Mixed hadrons beam 1-12 GeV/c: pions,

kaons, protons + electrons contamination at

low energies

Pure electron beams

Parasitic muon halo

O(100 M beam triggers to be acquired in 2018)

Page 18: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

Cryostat: design study with GTT concluded completed

definition of all detector interfaces with WA105

Full engineering study and procurement launched

Cryogenics:

Design closure in April 2016

Tender closure June 2016

Delivery October 2017

System acceptance January 2018

Cryostat schedule:

Construction of steel structure: July-September 2016

Assembly of cryogenic insulation: October 2016-April

2017

Detector assembly inside the cryostat: April-November

2017

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Cryostat-detector integration

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Preparation for PMTs procurement:

Test calibration system at warm/cold

Preparation of cathode HV system:

HV power supply for 300 kV already purchased

from Heinzinger

HV feedthrough to be deployed on 3x1x1 but

designed to work up to 300 kV under construction

(being tested at CERN up to 300 kV)

Synergy with SP which can use the same (at 180

kV)

Finalization of CRP mechanical

structure design:

Cold bath tests + photogrammetry

on differential effects in thermal

contraction, decoupling mechanism

Extraction grid wires integration

tests

Page 21: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

To be built in collaboration with

CERN, interest of UTA in participating to the construction

Baseline design from LBNO DS with pipes and hanging chains of FR4

Design synergy with SP by using similar profiles as foreseen by SP but with a slightly different shape more « closed C » like

6 m

6 m 6 m

Transparent cathode with ITO (Indium-Thin-Oxyde) resistive coating on two sides + TPB deposition at the top side: Completion of R&D Infrastructure set up for TPB evaporation coating Tested ITO coated PMMA plates up to 850x600

mm2 (produced by industry) Executive integration design by July 2016

Field cage:

Test of SP open profiles in Bdg 182. Final design with SP like panels aimed by July 2016

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Cost effective and fully accessible cold front-end electronics and DAQ

Ongoing R&D since 2006 entered in production phase for 6x6x6 (7680 readout channels)

ASIC (CMOS 0.35 um) 16 ch. amplifiers working at

~110 K to profit from minimal noise conditions:

• FE electronics inside chimneys, cards fixed to a plug

accessible from outside

• Distance cards-CRP<50 cm

• Dynamic range 40 mips, (1200 fC) (LEM gain =20)

• 1300 e- ENC @250 pF, <100 keV sensitivity

• Single and double-slope versions

• Power consumption <18 mW/ch

• Produced at the end of 2015 in 700 units (entire 6x6x6)

DAQ in warm zone on the tank deck:

• Architecture based on uTCA standard

• Local processors replaced by virtual processors

emulated in low cost FPGAs (NIOS)

• Integration of the time distribution chain (improved PTP)

• Bittware S5-PCIe-HQ 10 Gbe backend with OPENCL

and high computing power in FPGAs

• Production of uTCA cards started at the end of 2015,

pre-batch to be deployed on 3x1x1

ASIC 16 ch.

(CMOS 0.35 um)

Large scalability (150k channels for 10kton) at low costs

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Global uTCA DAQ architecture integrated with « White Rabbit » (WR) Time and Trigger distribution network

+ White Rabbit slaves nodes in uTCA crates

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Beam time request • Maximum particle rate to avoid too many particle overlaps in TPC:

𝑅 = 100 Hz Assume this could be achieved for any momentum setting of the beamline

• For SPS spill of 4.8 s and super-cycle of 2 spills / 50 s the number of particles expected to be delivered to the detector per super-cycle

2 × 4.8 𝑠 × 100 𝐻𝑧 = ~1000 particles / super-cycle

• Assuming 50% running efficiency: ~829k per day

24

Thanks to L. Gatignon (CERN) N. Charitonidis (CERN)

• Simulation of beam developed with G4Beamline toolkit

• Detailed breakdown of particles rates obtained for different species to estimate required running time

• about 100M beam triggers expected on 120 days

Page 25: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

Beam time request

The running time in each momentum set is calculated based on the number of days needed to collect a desired pion statistics with reasonable rates for other particles acquired in “parasitic” mode taken into account

25

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For each beam trigger we can have on average 70 cosmics overlapped on the

drift window after the trigger (these cosmics may have interacted with the detector in the

4 ms before the trigger and in the 4 ms after the trigger chopped tracks, “belt conveyor” effect

26

Example of cosmics only event (in one of the views)

Typical event signature for ground surface Liquid Ar TPC operation

Page 27: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

C.R. stands for Counting Room

Online processing and storage facility: internal bandwidth 20 GB/s, 1 PB storage, 384 cores: key element for online analysis (removal of cosmics, purity, gain, events filtering)

Smaller scale test system being prepared for the operation of the 3x1x1 in September

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Offline (downstream the online computing farm) and computing model: MC production and code management actually centralized at CCIN2P3 in Lyon

Massive MC production expected at CCIN2P3 and possible other centers

6x6x6 data production at CERN and Fermilab

Software based on QSCAN (simulation/reconstruction); fast execution and easily adaptable

for detector performance analysis, online monitoring and analysis :

Framework dealing with all the aspects of the detector simulation and reconstruction going

from: geometry description, interface to MC transport codes like Geant3/4 via VMC, events

generators like Genie, detector response and electronics simulation for both single and dual-phase,

simulated and real events reconstruction and event display. Interface to the raw and simulated data

formats for various detector setups going from several R&D prototypes to WA105 3x1x1 and 6x6x6

and the 20 and 50 kton detectors considered in the LAGUNA-LBNO design study. Allowing to

understand the performance of the detectors under construction like the 3x1X1 and 6x6x6 by also

comparing to the result obtained in the last 10 years with different prototypes.

3x1x1 simulation analysis and monitoring with QSCAN (September 2016). Developing

QSCAN for 6x6x6, needed for detector optimization analysis and online analysis/monitoring

O(100 M) beam triggers expected in 2018 (+ cosmic runs and technical tests). If totally

stored in non-zero-skipped, lossless compression format (Huffman factor 10 compression:

15MB/event) 2.4 PB total data volume

Computing infrastructure (storage/processing) under discussion with CERN IT and

Fermilab computing division:

• Requested link from online-storage to CERN computing division at 20 Gbps, compatible

with 100 Hz non-zero-skipped, Huffman compressed data flow

• Existing fast link between CERN and FNAL

Page 29: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

Detector installation in EHN1 (details given in the installation sequence in spare slides)

29

TCO

4.4

m

1.2m

• Feedthroughs are installed first

• The material for detector installation is brought to a clean room buffer and then via TCO into the cryostat

• CRPs will be pre-assembled at CERN, packed in a protective case, and then brought in vertically via TCO

Installation sequence same as for 10kt DUNE

• For CRP assembly at CERN clean room in Bld 185 is requested from January 2017 (4 CRP assembly in parallel)

TCO = Temporary Construction Opening

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Synergies with single-phase protoDUNE:

• Beam monitoring detectors – joint Working Group.

• Beam window/Beam plug – common development through DUNE FD Working Group

• Field cage – common development through DUNE Far Detector Working Group

• High Voltage – common development through DUNE Far Detector Working Group

• Slow Control/Detector Monitoring – joint Working Group

• DAQ with areas of common interest such as DAQ software, Run Control software, data

formatting software, and potentially timing distribution hardware

• Online Computing focusing on online computing farm, online disk storage, online

monitoring, and data transmission to Tier 0 – joint Working Group

• Offline Computing - joint effort through DUNE Software & Computing Working Group

• Cosmic triggering - joint Working Group

EOI call within DUNE (January 2016):

New institutes have expressed their interest to work on WA105:

FNAL (Computing and Neutrino Divisions), Czech Republic Institutes, University of Texas

Arlington, National Centre for Nuclear Research, Kyiv National University, University of

Wisconsin, Maryland, Argonne National Laboratory and DUNE-UK.

The expressions of interest included input for construction, commissioning, operation as

well as intellectual contributions to WA105.

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Conclusions:

The dual-phase design provides many appealing aspects in improving the detector

performance and reducing its construction costs. Long standing efforts have been

spent in this direction during the last 10 years and are now culminating in a large

scale implementation with the 6x6x6 detector operation in the CERN North Area.

The activity on the 3x1x1 pilot detector has been extremely useful in order to reach

an advanced state of prototyping and costs assessment of most of the components

for the 6x6x6 and to anticipate legal and procurement problems. The 3x1x1 assembly

is being finalized now for cryogenic operation in September. The operation of the

3x1x1 will allow for testing and optimizing the design of the online storage/data

processing system, having a subset of the system already available.

The design of the remaining aspects of the 6x6x6 is going to be finalized by July

2016. Some parts (electronics, PMTs, HV) are already in production phase. Full

installation planning, driven by the EHN1 infrastructure planning, has been developed

for data taking in April 2018 and beam requests have been formulated for 100M of

beam triggers obtainable over a period of several months.

The DP ProtoDUNE successfully passed the SPSC annual review. We are looking

forward to the DP ProtoDUNE detector exploitation with the beamline in 2018 !

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Page 33: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

CRP 3X3 m²

• First CRP assembled and in

position

33

A sequence of frames showing a cut view inside the cryostat will illustrate the assembly procedure

Page 34: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

CRP 3X3 m²

• CRP lifted

34

Page 35: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

CRP 3X3 m²

• Same Procedure for the other

CRPs

35

Page 36: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

CRP 3X3 m²

• All CRPs fixed on nominal

Position

36

Page 37: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

Field Cage

• First Field Shaper Installed

37

Page 38: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

Field Cage

• Drift Cage is lifted as the field

shaper are istalled

38

Page 39: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

Field Cage

• Last field shapers not yet

mounted

39

Page 40: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

• Part of the temporary floor is

removed

Cathode and PMTs

40

Page 41: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

• Cathode structure assembled

on the floor

Cathode and PMTs

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Page 42: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

• PMTs Installation at the

structure

Cathode and PMTs

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Page 43: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

• PMMA coated Plates installed

at the Cathode

Cathode and PMTs

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Page 44: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

Cathode and PMTs

• Installation of the last field

shapers

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Page 45: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

Cathode and PMTs

• Cathode connected to the

Drift Cage and Lifted

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Page 46: ProtoDUNE dual-phase planning - Fermilab · DP meeting week was organized on that sense during the week of February 22nd. A dedicated meeting on the field cage design and construction

Removal of Temporary Assembly Floor

• Temporary Assembly floor

removed

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Closure of the TCO

• Membrane and TCO closed

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Schedules: Main milestones

3x1x1 Building 182: • February 2016: start detector installation (arrival at CERN of the

Top Cap build by Gabadi which is supporting the detector structure) • June 2016: weld top cap. and seal cryostat • July 2016: perform test in Gas Ar • August 2016: start cryogenic operation • September 2016: start cosmic ray data taking

6x6x6 in the NA EHN1: • September 2016: start cryostat construction • April 2017: start detector installation • December 2017: seal TCO & cryostat • January 2018: start cryogenic operation (cooldown+filling)

• April 2018: ready to collect beam data

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CRP cryogenic tests

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• 50x50 cm2 LEMs have been successfully tested in pure gas argon at 87K

• The fully assembled CRP mechanical structure has been tested twice in open LAr bath

• Photogrammetry and strain gauges to measure deformations

• Test of near final configuration (anodes, LEMs, level meters, cameras, …) done in March 2016

• All instrumentation functioned properly

With help from cryo group at CERN: J. Bremer, D. Montanari

3x1 CRP in open LAr bath

Mini CRP

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High voltage

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• Minimal required HV on the cathode for DLAr is 300 kV 0.5 kV/cm drift field strength over 6m

• HV feedthrough for LArProto capable to withstand 300kV operation has been designed

• The FT will be tested at CERN with 300kV Heinzinger PS already acquired for WA105

COMSOL simulation of fields around feedthrough

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uTCA crates

Readout in groups of 640 channels/chimney 640 channels/chimney

1 uTCA crate/chimney, 10 Gb/s link

10 AMC digitization boards per uTCA crate, 64 readout channels per AMC board, memory buffer

12228 samples/channel

12 uTCA crates for charge readout + 1 uTCA crate for light readout

uTCA charge readout architecture

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2015 prototype of the 64 channels AMC digitization card (2.5-25 MHz, 12 bits, 2V, AD5297) hosted on Bittware S4AM, 10 GbE output on uTCA backplane

Production of uTCA AMC cards for the 6x6x6 started at the end of 2015, first batch to be deployed on 3x1x1

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Cold front-end electronics

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ASIC under testing

Anode capacitance is 150 pF/m 450 pF for a 3x3m2 module: expected noise = 1600 ENC For LEM equivalent gain of 20 (10 per each view)

S/N ~ 100 for 1MIP signal

Measured ENC as a function of Cdet

• Accessible via chimneys (without opening of the TPC cryostat)

• Shielded from digital electronics

• Preamplifier ASIC final version: • 16 channels

• Double slope gain with “kink” at 400 fC

• 1200 fC dynamic range

• Full production of 700 chips performed in Sep. 2015 (covers fully 7680 ch required for 6x6x6)

• A batch of 25 circuit tested in Jan 2016

• Good performance observed

• Will be available to instrument LArProto

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t=beam trigger - 2 ms t=beam trigger reconstructed event

drift

t=beam trigger t=beam trigger + 2 ms reconstructed event

drift

The « belt conveyor » effect

+- 4 ms around the beam

trigger time

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Typical event signature for ground surface Liquid Ar TPC operation

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During spills it is needed a continuous digitization of the light in the +-4 ms around the

trigger time (the light signal is instantaneous and keeps memory of the real arrival time of

the cosmics)

Sampling can be coarse up to 400 ns just to correlate to charge readout

Sum 16 samples at

40MHz to get an effective

2.5 MHz sampling like for

the charge readout

The LRO card has to know

spill/out of spill

Out of spill it can define self-

triggering light triggers when “n”

PMTs are over a certain

threshold and transmit its

time-stamp over the WR 55

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Data size

Data are expected to be taken without zero skipping and exploiting loss-less

compression and the system has been designed to support up to 100 Hz of beam triggers

without zero-skipping and no compression

7680 channels, 10k samples in a drift windows of 4ms 146.8MB/events, No zero skipping

Beam rate: 100Hz

Data flow= 14.3 GB/s

Light readout does not change in a significant way this picture (<0.5 GB/s)

Integrated local DAQ bandwidth on the “20 GB/s scale”

Local data buffer ~ 1000TB (no zero skipping, no compression), also used for local processing

Huffman lossless compression can reduce the non-zero-skipped charge readout data

volume by at least a factor 10 (S/N for double phase ~100:1, small noise fluctuations in

absolute ADC counts)

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