dØ calorimeter status

DD

DØ Collab Meeting April 27, 20011

Leslie GroerColumbia University DØ Calorimeter Status

1

DØ Calorimeter Status

Z

y

x

p

Liquid argon sampling Stable, uniform response,

rad. hard, fine spatial seg. LAr purity important

Uranium absorber (Cu or Steel for coarse hadronic)

Compensating e/ 1, dense compact

Uniform, hermetic with full coverage

< 4.2, int total) L. Ar in gap 2.3 mm

Ur absorber3, 4 or 6 mm Cu pad readout on 4.6 mm

G10 with resistive coat epoxy

p_

Energy Resolution e: E / E = 15% /E+ 0.3% (e.g. 3.7% @ 20 GeV)

: E / E = 45% /E + 4% (e.g. 14% @ 20 GeV)

ICD

DD



2

Run II Calorimeter Electronics

55K readout channels Replace signal cables from cryostat to preamps (110 30) Replacement of preamps, shapers, baseline subtraction circuitry (BLS) Addition of analog storage: 48-element deep Switched Capacitor Array – SCA New Timing and Control New calibration pulser + current cables

Preamp/Driver

Trig. sum

Filter/Shaper

x1

x8

SCA (48 deep)

SCA (48 deep)

SCA (48 deep)

SCA (48 deep)

BLSOutputBuffer

Bank 0

Bank 1

Replace cablesfor impedancematch

new low noise preamp & driver

Shorter shaping~400ns

SCA analog storage> 4sec, alternate

Additionalbuffering for L2 & L3

SCA

new calibratedpulse injection

BLS Card

DETECTOR

DD



3

Calorimeter Electronics Status

Preamp All tested and installed (1152 motherboards x 48 preamps = 55k) ECS recabled after being off platform All 24 + 1 ICD power supplies installed All calibration pulsers installed, cabled, tested and commissioned Commission preamps and readout chain Fix known broken cables in shutdown

BLS 36/36 PS installed + 3 spares; 12 BLS fanouts installed >10/12 quadrants populated (964/1152).

Need 200 more (~100 for high eta – MG, ICD) Final board assembly/modifications/testing at SUNY-SB (> 20/week).

Commission ADC Readout and Timing & Control

Run I ADC’s working fine and being readout as part of data taking 12 Timing and Control cards being used

need T&C controller (1-2 week layout, 2-4 week production) PIB control working and being readout into data

DD



4

Calorimeter Electronics StatusT

&C

AD

C

AD

C

T&

C

Co

mm

issi

on

Trig

ger

PS

Boa

rds

Boa

rds

Boa

rds

PS

Boa

rds

Trig

ger

P S P S

0 11

1 10

2 9

3 8

4 7

5 6

Key: complete partially complete incomplete

BL

S

BL

S

Co

mm

issi

on

PS

PS

Pre

amp

Pre

amp

ENDCAPSOUTH

CENTRALCALORIMETER

ENDCAPNORTH

N

DD



5

Intercryostat Detector (ICD) Installation

ICD Tiles and Electronics Readout through Calorimeter BLS

system with slightly different preamps

1.5 tiles installed and instrumented on ECS-SW for 36 x 36

PMT box, HV + LV power, electronics pulser installed

Calibration, fiber characterization and PMT matching for signal optimization ongoing in cosmic ray test-stand

Final install in May shutdown on ECS. ECN might depend on FPS cabling issues

DD



6

Calorimeter Commissioning Shifts

Calorimeter Commissioning prior March 1 startup. Got most of CC done (<0.5% bad channels) Shifts ongoing 2-3/day. Thanks to all who

contributed U. Bassler, F. Beaudette, G. Bernardi, M. Bhattacharjee,

V. Bhatnagar, L. Duflot, T. Eltzroth, S. Fu, M. Gao, R. Hauser, M. Hohlfeld, B. Kehoe, N. Parua, M. Ridel, D. Schamberger, M. Tuts, V. Zutshi

Will finish up ECS and most of ECN in May shutdown

DD



7

Calorimeter LAr, HV

LAr and HV All cryostats

filled with LAr – no leaks!!!

All HV has been turned on to 2kV on all channels – stable over the last few weeks

LAr purity tested (< 0.4 ppm O2 equiv.)

LAr temp. and purity being monitored

DD



8

Calorimeter Downloads & Controls

Downloads/controls Final download system

(COMICS) not in place yet but tested with prototype

Pedestal/limits files will be read from pickle file in Comics and downloaded to ADC

Working on pulser and T&C communication

Control GUIs (via EPICS) for LV and HV work

General alarm monitoring of all systems via SES needs to be fully implemented

General “health” GUI for shifters needed

DD



9

Calorimeter Calibration Calibration

Pedestal calibration data sent to and processed in L3 scriptrunner node

Data sent to CalibManager and then to Online Oracle dB. Need to extend for gain calibrations and to send to offline.

Python tools extract data to pickle files

Working on handling dual gain pedestals and gain runs with pulser

Need automatic setup, validation and extraction tools

DD



10

L1/L2 Calorimeter Trigger

L1/L2 Cal trigger uses EM and FH layers (no CH) Trigger Hardware – BLS boards

Layer weights determined for CC and EC Trigger drivers/summers 94% installed for CC (|| < 1.2)

Remaining summers being repaired Triggers drivers here for EC (1.8 < || < 3.8). Summers here in ~ 1 wk New for Run II – trigger on MG and ICD at L2.

Recovers jet response and resolution in ICR region Sampling weights have been determined and in the process of ordering parts to make

the high eta summers and drivers. Trigger summers – first pass. Final tuning done with beam

Trigger Hardware – MCH1 L1 CTFE boards – use Run I electronic resistor network for CC –0.8 < < 0.8 Run II variable gain mezzanine cards out for production soon For start of run expect 16 trigger terms available

CEM(1or 2,rsi), CJT(1 or 2,rsi) 4 reference sets: EM: 2, 5, 7, 10, Total: 2, 3, 5, 7 GeV. Uncertainty in energy scale about 30%

Full readout to L2 + L3 needs some coding and equipment ~ 1 month Can readout via monitoring path for 36x36

Final timing of trigger to the signal and beam crossing needs to be done

DD



11

Hot off the Press!!!Data taken around 00:00 today!

Date Created: Friday, April 27, 2001 12:18:00 AM CDT

Date Saved: Friday, April 27, 2001 12:38:28 AM CDT Category - Topic - sequence number: CAPTAIN_Shift/Log - General_Log - 3016 Operator(s): Horst Wahl Keyword(s): :CAPTAIN:

0:15 experts around: Dean Schamberger, Mike Tuts, Dan Edmunds, Michael Begel

**** first calorimeter trigger run taken *** run # 119575, CAL only, trigger: 1 em tower > 7 GeV 36x0 store in the Tevatron

DD



12

Pulser Timing Studies

time

pulseheight

0 +6+3-3sampling time with respect to trigger

increasing pulser delay

Variation of pulse delay to study signal shape and to determine timing for maximal response for different preamp type and calorimeter capacitance

Variation of pulse height to determine linearity and gain calibration factors

Automatic ramp mechanism will allow for detailed studies of timing and linearity

Offline unpacking and analysis software needed

DD



13

Pulser Delay Curves

EM2EM1

EM3a EM3b

EM3c EM3d

EM4 FH1

CH

FH3FH2

CH

EM – 4 parameter fit HAD – 6 parameter fit

Extract timing parameters and gain calibration coefficients

Correction factors due to difference between pulser and physics signal

DD



14

Calorimeter Status and PlansApr-May 2001

Status Almost all infrastructure in place All crates reading out. Few need some internal timing for readout. T&C controller still ~6 weeks >10/12 quadrants instrumented.

200 BLS boards to go, 100 for high eta, > 20/week CC mostly debugged (0.5% level), work on ECS + ECN in May Trigger summers/drivers

CC essentially done (94%) EC summers should be here for May shutdown – test and install Ordering parts for high eta (MG, ICD)

Run Plan for 36 x 36 Think we are timed in relative to TFW using pulser and trigger pickoffs to within

one bunch crossing (132 ns) Use triple digitized readout to get this exact Compare L1 trigger energy and precision readout (gains are off a bit as Run 1

hardware at first) Take steady data for online/offline calibrations, -intercalibration, timing +

response studies, energy-scale determination etc., etc.

dØ calorimeter status

Documents