Transcript CLEO Plenary, 10/16/99

Jianchun Wang
Syracuse University
10/16/99
CLEO Meeting
Outline
• DAQ problems solved
• Recent results
• Status of DAQ
• Work to be done
DAQ Problems Solved
 Software problem
 Corrupted data
 DAQ bug, results in digital +2 V not set
 Hardware problems in digital data boards
 VME buffer/driver destroyed ( 14 boards affected )
 Wrong VME and Sequencer code
 ADC buffer damaged ( 20 boards affected )
 Buffer enable conflict
 Timing problem
 Wrong timing caused wrong ADC to be read out
10/16/99
Jianchun WANG, Syracuse University
2
Corrupted Data
o Noise expected to be 3-4 ADC
counts (~500 e)
o DAC address 0-3 was shifted to be
1-4
o Effectively digital +2V not set
o Bug fixed and noise as good as
expected
o Parameter monitor and alarm
working now
Pedestal RMS (ADC counts)
10/16/99
Jianchun WANG, Syracuse University
3
Noise Performance
 Each crate checked, no
problem with CC and cable
 Half cylinder tested
simultaneously with
repaired boards
 Total noise ~ 3.6 ADC
counts
 Incoherent noise ~ 2.6
ADC counts (400 e)
10/16/99
Jianchun WANG, Syracuse University
4
Parameter Monitor
 Parameter monitor: Voltages, Bias currents, Temperatures
 protect data board, chamber, ensure data quality
 Readout via SBUS
 By Bayar & Jian
 Auto measurement
and alarm implemented
 Need to integrate into
main slow control and
alarm system
10/16/99
******************************
* Crate: 123
Board: 4 *
* Board ID: RICH ANALOG A025 *
******************************
** Board values**
Ch. 0 -> +5 analog: 480
4.996
Ch. 1 -> -5 analog: 343 -5.191
Ch. 2 -> +2 digital: 470
2.460
Ch. 3 -> -2 digital: 477 -2.543
Ch. 4 -> board temp: 509 25.224
Ch. 5 -> cal pulse: 615
0.097
** Cell values**
Ch. 0 -> +2 analog: 524
2.013
Ch. 1 -> -2 analog: 216 -2.288
Ch. 2 ->
Vfp: 625 -0.486
Ch. 3 ->
Vfs: 688
0.673
Ch. 4 ->
Vref: 472 -0.673
Ch. 5 ->
prebias: 634
0.494
Ch. 6 ->
shabias: 298
0.023
Ch. 7 ->
iBuf:
0
0.000
Ch. 8 -> thermistor: 544 22.110
Ch. 9 -> ADC offset: 741
1.811
Jianchun WANG, Syracuse University
V
V
V
V
C
V
526
213
628
682
474
644
321
1
541
741
2.015
-2.291
-0.483
0.667
-0.671
0.502
0.025
0.000
22.375
1.811
526
214
630
685
479
594
325
1
542
740
2.015
-2.290
-0.480
0.670
-0.665
0.463
0.025
0.000
22.287
1.808
5
V
V
V
V
V
mA
mA
mA
C
V
Data Boards
10/16/99
Jianchun WANG, Syracuse University
6
ADC Buffer Problem
 ADC readout difference is small within one chain with no
front end electronics connected
 Difference of 256 suggests that bit 8 may be wrong
 Buffer damaged and bits
shorted
 Wrong buffer enable
before initialization and
during reprogramming
 All 20 boards repaired ;
all digital boards modified
pull-up resistor array
10/16/99
Jianchun WANG, Syracuse University
7
Timing Problem
o Wrong buffer timing or
FIFO timing may cause
wrong ADC selected
(duplication, rotation )
o Test chain with no CC4
used to check all boards
o 4 boards found such
problem
o All boards are adjusted
10/16/99
Jianchun WANG, Syracuse University
8
Wirepulse Calibration
• Calibration pulse sent to
anode wire and measure
induced charge
• Half cylinder shown here
• Signal height quite
uniform
• Dead channels 0.4%
10/16/99
Jianchun WANG, Syracuse University
9
Plane Radiator
10/16/99
Jianchun WANG, Syracuse University
10
10/16/99
Jianchun WANG, Syracuse University
11
Status of DAQ
 DAQ version 9902 and 9904 were used in the runs shown
 Version 9902 uses only software trigger on TIM, so two
crates can not be triggered simultaneously
 Version 9904 use DFC and GCAL send trigger to TIM,
configuration manager not function
 DAQ version dlib (Y2K) has a successful run on two RICH
crates. More functions need to be tested.
 More details, see Todd’s talk
10/16/99
Jianchun WANG, Syracuse University
12
Work To Be Done
 Read out all RICH crates with new DAQ system
 Measure pedestal, noise performance and wirepulse
calibration to find any remaining problematic boards
 Test new DAQ functions including single channel
calibration and data sparsification
 Continue coding on online monitor
 Determine the mode for big calibration
 Cosmic ray run
10/16/99
Jianchun WANG, Syracuse University
13