Calorimeter: Electronics Upgrade

1
Calorimeter Electronics Upgrade

• 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)

Trig. sum
Bank 0
Calibration
electronics readout chain
SCA (48 deep)
SCA (48 deep)
x1
Filter/ Shaper
Output Buffer
Preamp/ Driver
BLS
SCA
x8
Calorimeter
SCA (48 deep)
SCA (48 deep)
Bank 1
2
Calorimeter Performances
Timing Studies using triple sampling runs all
crates timed in at 10ns
Energy Scale estimation from electronic
calibration absolute scale verified at 10
SCA-behavior pedestal measurement over all
channels of 1 chip spread 1ADC count
ADC counts
L1 SCA up
pulser ADC-readout
L1 SCA down
pulser shaper output
L2 SCA
3
Calorimeter W/Z events
Z ?ee candidate 2 EM objects, ET gt 20
GeV, isolation and shower shape cuts
m(e,e) L0.7pb-1
DØ
DØ
mT(e,n) L0.7pb-1
MZ
un-calibrated energies
un-calibrated energies
transverse mass (GeV)
invariant mass (GeV)
4
Calorimeter jet events
?-jet event ET?27 GeV em-fraction 0.9
2-jet event ETjet1230 GeV, ETjet2190GeV
Etjet24GeV em-fraction 0.5
DØ
Run I- jet corrections
DØ
0.7 cone