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Trig. sum. Bank 0. Calibration. electronics readout chain. SCA (48 deep). SCA (48 deep). x1. Filter/ Shaper. Output Buffer. Preamp/ Driver. SCA. BLS. x8. Calorimeter. SCA (48 deep). SCA (48 deep). Bank 1. Calorimeter: Overview. Ursula Bassler.

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calorimeter overview

Trig. sum

Bank 0

Calibration

electronics

readout

chain

SCA (48 deep)

SCA (48 deep)

x1

Filter/

Shaper

Output

Buffer

Preamp/

Driver

SCA

BLS

x8

Calorimeter

SCA (48 deep)

SCA (48 deep)

Bank 1

Calorimeter: Overview

Ursula Bassler

New Phenomena Meeting 10/11/01

problems during post shutdown data taking
Problems during Post-Shutdown Data Taking
  • Problem with timing with respect to the beam.
  • Frequent failures of BLS (base line subtracter) power supplies.
  • Dead, noisy, hot electronics channels
  • Problems in understanding ADC to GeV conversion.

New Phenomena Meeting 10/11/01

timing studies triple sampling
Timing Studies: triple sampling

comparison of energies measured at the

nominal BX,132ns earlier/later:

  • ratios allow to determine time offset
  • more precise timing from comparison with model

signal

time

-1

0

+1

+ 97 ns

+ 113 ns

+ 81 ns

early/

nominal

=0.64

=0.61

=0.39

=0.69

late/

nominal

=1.04

=0.82

=0.77

=0.78

Mingcheng Gao

Mingcheng Gao,. ColumbiaNew Phenomena Meeting 10/11/01

bls power supplies
BLS Power Supplies
  • Put Magnetic circuit breakers on all BLS supplies.
    • A total of 36 supplies (+spares) needs to be worked on.
    • 10 are already done.
    • We will finish this job in 3-4 weeks.

New Phenomena Meeting 10/11/01

dead noisy and hot channels
Dead, Noisy and Hot Channels
  • Lot of bad electronics channels were replaced during past few months.
  • In particular during the supervised access of 2nd week of September ~ 400 bad channels were replaced.
  • Data taken after run ~131000 are the cleanest .
  • There is clear enthusiasm about reprocessing this data set with off-line hotcell killer (NADA) and corrected weight factor.
  • More Hot cells were found by shifter’s using Examines.
  • During Shutdown we plan to eradicate these.

New Phenomena Meeting 10/11/01

dead noisy and hot cells
Dead, Noisy and Hot cells

Replacing bad preamplifiers.

New Phenomena Meeting 10/11/01

slide7

Alan Stone

New Phenomena Meeting 10/11/01

slide8

using pulser with DAC=25k delay=0

  • T&C: x889, BLS: Base-2ticks, ADC: 0-sign suppressed

had channel

em channel

  • ADC measurement:

DAC=25k ADC counts: 6355

Ursula Bassler

New Phenomena Meeting 10/11/01

scope measurement
Scope Measurement
  • 1 em-channel (crate 8 ADC 6 BLS 0 Tower 3 Depth 3)

Shaper Output for ReadOut

PreAmp Input at BLS-card

  • DAC=25k shaper Output=2.2V  SCA (after gain selection) 1.1V
  • Electronics Design: 4V in SCA = 32000 Adc counts
  • estimation: 25k = 1.1V= 8800 Adc Counts

New Phenomena Meeting 10/11/01

slide10

This problem was later identified by Dean as 2 resistors on the BLS board put in the wrong order.

  • So all ADC to GeV conversion should be corrected by a factor of 1.4

New Phenomena Meeting 10/11/01

slide11

Runs Database from August 7- October 4 is available at

  • \\D0server4\projects\CalorimeterElectronics\Tuts\Cal_Runs_databse\fpdb\cal.access
  • Please look at the data and give us feed-back for hotcells, dead regions or starange behaviours.

New Phenomena Meeting 10/11/01

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