rbx prr overview mar 01 - boston university physicsphysics.bu.edu/cms/hcal/rbx_prr/rbx prr overview...

HCAL RBX PRR: Mar 1-2, 2001 1

HCAL RBX PRR OverviewHCAL RBX PRR OverviewHCAL RBX PRR Overview

Jim Freeman

RBX PRRMarch 1-2, 2001


HB Optics OverviewHB Optics OverviewHB Optics Overview

RBX


Central HCAL RBX’sCentral HCAL RBX’sCentral HCAL RBX’s

HE

HB 15

16RBX

RBX

HO


Optics-MegatilesOpticsOptics--MegatilesMegatiles

Components are the machined scintillator plates, cover plates, fiber assembly (WLS spliced to clear fiber, optical connector)

pigtails


Optics-MegatilesOpticsOptics--MegatilesMegatiles

Cross section view of a megatile


Installing MegatileInstalling MegatileInstalling Megatile


HB-HBHB--


HPDHPDHPD

Hybrid PhotoDiode photon transducer for HB, HE, HO. Fiberoptic front window, conventional photocathode, pixelated diode (19 or 73

channels/device). From DEP, Holland. Need ~ 600 total.


HPDHPDHPD

19 x 5.5mm 73 x 2.75mm

HCAL will use the DEP hybrid photodiodes for the photodetector.

There will be two types of tubes one with 73 and one with 19.


HPDHPDHPD

PIN Diode arrayCeramic feedthrough

Fiber-OpticWindowPhotocathode

e

4

16 kV

Gain

0

0

4000

8

4 p.e spectrum

0

1000

2000

3000

4000

5000

6000

7000

0 50 100 150 200 250 300


HB RBX Detail ViewHB RBX Detail ViewHB RBX Detail View

12.323 [313.00]

37.992 [965.00]

LOW VOLTAGE

AND PIPING AREA

HIGH VOLTAGEMODULE

4.173 [106.00]

CALIBRATIONMODULE

CCMMODULE

TOP VIEW

FRONT VIEW HB RBX COMPOSITE ASSEMBLY DRAWING

R. FOLTZ, FERMI LABJ. MARCHANT, UNIV. OF NOTRE DAMEAS OF 23 FEBRUARY 2001

COOLING WATERIN & OUT

19-CHANNELRM-1

19-CHANNELRM-2

73-CHANNELRM

19-CHANNELRM-3

19-CHANNELRM-4

CHUNC


RBX Readout ModuleRBX Readout ModuleRBX Readout Module• The readout module (RM) integrates the HPD, front end

electronics, and digital optical drivers.

HPD unit QIEs CCAs

Electronics Cards

Optical Drivers

Digital optical connector


RBX Readout ModuleRBX Readout ModuleRBX Readout Module• The readout module (RM) integrates the HPD, front end

electronics, and digital optical drivers.

HPD unit QIEs CCAs

Electronics Cards

Optical Drivers

Digital optical connector

Electronics cards

HPD MountHV

Interface Card

Optical Sorter


HCAL QIE-based Front EndHCAL QIEHCAL QIE--based Front Endbased Front End

ChannelControlASIC

Exponent(1:0)CapID(1:0)

Mantissa(4:0)

800 Mbit/sSerializer

VCSEL

CMS QIE

Exponent(1:0)CapID(1:0)

Mantissa(4:0)

ClockResetPedestal(3:0)

Test Pulse

Test PulseClockResetPedestal(3:0)

Data(15:0)

Clock

Control

Serial Control Bus

Global ResetBunch Crossing Zero40 MHz ClockSPLITTER

INTEGRATOR

ENCODER

FADC

CMS QIE

CMS QIE Solution

T. Shaw5/18/00


Access to FE ElectronicsAccess to FE ElectronicsAccess to FE Electronics

End of HB wedges obscured by cables and services from HB, EB, tracker. Servicing electronics nontrivial.

53 degree end of HB wedge.

Blue = HCAL services

Green = ECAL

Red = Tracker


HCAL Electronics OverviewHCAL Electronics OverviewHCAL Electronics Overview


CalibrationCalibrationCalibration

Moving Wire radioactive source calibration

Source Co60, 2mC

Carries calibration from test beam to CMS detector by taking ratio of source/(test beam), then re-measuring source at CMS.

Generates about 5nA current into the electronics

Laser Calibration System

Exercise electronics over full dynamic range, get slopes/crossovers for QIE ranges.

Set up timing of detector. Hits every channel with pulse of known timing.

LED Calibration System

Useful in factory, for “heartbeat” signal


Light Yield and NoiseLight Yield and NoiseLight Yield and Noise

Some NumbersLight Yield 10 pe / GeV

MIP Signal in HO ~10 pe

MIP Signal in Layer 0 ~ 5 pe

HPD Gain 2000X à MIP in HO is 20K e-

Desire well-separated signal from pedestal

à noise level of ~4000 e-

Radioactive Source Calibration (~5nA) uses 40Mhz path

5 nAà ~0.4 pe/25 ns.

Radioactive source appears as pedestal shift/broadening. Measure by massive oversampling. (106 samples). Nr samples increases with pedestal width.


Influence on Ped width on Calibration measurementInfluence on Influence on Ped Ped width on width on Calibration measurementCalibration measurement

.05 DNL Interpolated .5 SrcNoise 1.0 10 M Samples

0

5

10

15

20

25

-0.0

0048

9

-0.0

0036

2655

-0.0

0023

6309

-0.0

0010

9964

1.63

818E

-05

0.00

0142

727

0.00

0269

073

0.00

0395

418

0.00

0521

764

0.00

0648

109

0.00

0774

455

Mor

e

Error

Freq

uenc

y

.05 DNL Interpolated .5 SrcNoise 3.0 10 M Samples

02468

101214161820

-0.0

0084

03

-0.0

0053

2775

-0.0

0022

525

8.22

75E

-05

0.00

0389

8

0.00

0697

325

0.00

1004

85

0.00

1312

375

Mor

e

ErrorF

req

uen

cy


Noise vs Input CapacitanceNoise Noise vsvs Input CapacitanceInput Capacitance

Noise = 2400 + (30 * Cd)

y = 29.197x + 2358.2

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

0 20 40 60 80 100

Detector Capacitance (pf)

Inp

ut

No

ise

(ele

ctro

ns)

Series1

Linear (Series1)

Spice model of QIE. 50 ohm cable ~ 1pf/cm


HB ScheduleHB ScheduleHB Schedule

Major HB Activity 2001 2002 2003 2004 2005 20061 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6

Install Scintillators in HB- (186)Install RBX HB-QIE Calibration System Study (FNAL)Move HB- to SX5Assemble HB- (SX5)HB+ arrives 186Install Scintillators in HB+ (186)Test Beam H2Move HB+ to SX5Assemble HB+ (SX5) Install RMs into RBX (SX5)Burn-in period (SX5)HB Trial Insertion into VactankHB Complete in UX5


Design Criteria for RBXDesign Criteria for RBXDesign Criteria for RBX

• Interfaces to other subsystems• Accessibility/Serviceability• Environment for Electronics (volume,

cooling, power, clock, noise)• Safety• Manufacturability • Cost


Some of the tasks waiting until after PRR

Some of the tasks waiting Some of the tasks waiting until after PRRuntil after PRR

• Analog optical cable factory • Optical cable shrouds• Finalize backplane, power, clock distribution• Connectors for card/backplane• Card layout• HV/LV cable procurement• HV/LV Connectors• Digital optical connectors


RBX SituationRBX SituationRBX Situation

• Have a very complete design• Staff organized to immediately start factory• Many HCAL design issues contingent on

finalizing RBX• Electronics (geometry, card layout, backplane,

grounding, cooling, noise, …)• Optical cables (length)• HV/LV cables (acquisition)

• Need to finalize so design group can move on to next jobs (HE, HO)

• Delays = $$

rbx prr overview mar 01 - boston university physicsphysics.bu.edu/cms/hcal/rbx_prr/rbx prr overview...

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