Status of The D0 Calorimeter

Nirmalya Parua(For the Calorimeter

Group)

02/11/02 Nirmalya Parua

General Overview 55k channel Ur/liq. Argon calorimeter Run II upgrade:

replacement of electronics to accommodate faster bunch crossings

55k dual FET PreAmps 23k Switch Capacitor Arrays (SCA) on 1200 BaseLineSubtraction (BLS)-boards~ 50 bad channels (~0.1%)

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

SCACalorimeter

Calibrationelectronicsreadoutchain

All Experimenters meeting

02/11/02 Nirmalya Parua

Installation & CommissioningC

om

mis

sio

n

T&

C

AD

C

Tri

gg

er

Bo

ard

Tri

gg

e B

oa

rd

AD

C

Tri

gg

er

PS

Bo

ard

s

Bo

ard

s

Bo

ard

s

PS

Bo

ard

s

Tri

gg

er

P S P S

0 11

1 10

2 9

3 8

4 7

5 6

Key: complete partially complete incomplete

BL

S

Pu

lse

r

BL

S

Pu

lse

r

PS

PS

Pre

am

p

Pre

am

p

ENDCAPSOUTH

CENTRALCALORIMETER

ENDCAPNORTH

N

Only Remaining piece is Trigger readout for ||>0.8We have occasional failure of power supplies.

02/11/02All Experimenter’s

MeetingNirmalya Parua

Finer Debugging

… .…

… .…

x8

x1

L1 SCA up

L2 SCAADC

down

Mean value

AD

C c

ou

nts

L1 SCA up

L1 SCA down

L2 SCA

R. Zitoun, Stony Brook

Most problems are traced to slower SCA chips.

More than 250 are replaced

02/11/02 Nirmalya Parua

Impedance Measurement

PreAmp-Cryostat Cable

Feedthrough

various detector capacitances

Broken cable

Paris & Orsay

A total 31 channels are not connected

02/11/02 Nirmalya Parua

• -50 ns 98.01%• -20 ns 99.69%• -10 ns 99.92%• 10 ns 99.93%• 20 ns 99.71%• 50 ns 98.23%

Sampling time vs amount sampled

Nominal sampling time varies from –6 ns to 35ns

Pedestal Values were different for Early, Nominal or Late sampling.

Corrected after putting additional CAPS on BLS boards.

••

•

M. Gao, Columbia, NY

132 ns later

Nominal

Timing Studies

132 ns early

02/11/02 Nirmalya Parua

Online Data Quality Check

Shifter’s are continuously monitoring quality of data.

When hot cells are found corresponding readout channels are suppressed.

N.Parua

02/11/02 Nirmalya Parua

Pulser CalibrationPulser signal injected here (measured in DAC

counts)

DAC/1000

Non linearity <0.3% for DAC>1000

For Lower DAC values non linearity is parametrized (same for all channels).

ADC

8 1

saturation

R. Zitoun

pulser ADC readout

pulser shaper output

S. Beauceron

02/11/02 Nirmalya Parua

W/Z candidate

Yuri Gerstein kado, zitoun Transverse mass

Invariant Mass

Chan, Zutshi

Em Cluster with track

02/11/02All Experimenter’s

MeetingNirmalya Parua

Multi jet events

2-jets event• ET

jet1~230GeV• ET

jet2~190GeV

3-jets event• ET

jet1~310GeV• ET

jet2~240GeV• ET

jet3~110GeV• ET~8GeV

A. Kupco

02/11/02 Nirmalya Parua

Jet Energy Scale

Et=27 GeV

Et=24 GeV

Energy Density for Min-bias Data

Two-jet Events

N. Parua, J. Coss, S. MuanzaIa Iashvilli