CDET scintillator test

From Hall A Wiki
Revision as of 09:59, 15 July 2014 by Murthan (Talk | contribs)

Jump to: navigation, search

Test setup

Setting up the hardware and DAQ required for the scintillator test project.

DAQ setup

  • Working on computer wm122 under account adaq ( which uses usual password)
  • Created script /home/adaq/coda_user_setup_bash to define CODA 2.6 variables. This script is sourced by .bash_profile .
    • Set EXPID=wmtest and SESSION=wmtest instead of previous eeltest.
  • The msql daemon must be running. Chcek by command ps -ef | grep -i msqld . It should return the process number for the msqld.
  • The CODA database is wmtest.
    • The eeltest database is being used by yer122 so that name cannot be used.
    • The eeltest database was dumped to a file.
    • The dump file was editted to change eeltest to wmtest .
    • A database wmtest was created and then the dump file with wmtest edits was restored into the msql
    • The file /home/adaq/msql/readme explains these basic msql commands.
    • On June 28th, an msql dump of database wmtest was made called /home/adaq/msql/msql_dump-wmtest
  • To start up CODA ( right now do not use startcoda script) run this command in separate terminal windows
    • et_start ( note that if it gives error message try deleting files /tmp/et_start*)
    • rcplatform
    • coda_eb_rc3 -i -n EB1 -t CDEB
    • coda_er_rc3 -i -n ER1 -t ER
    • the roc process is started when the CPU ( a1nccvme ) in the VME crate is booted.
    • rcgui
  • To start taking data from the rcgui interface
    • SESSION=wmtest and CONFIG=KAeel122 should be selected.
      • Note that if you update the CODA database, the COOLHANDS database needs to be updated.
    • From menu select Connect
    • Click on the Config button. EB1, ER1 and ROC1 should be configured.
    • Click on the Download button. EB1, ER1 and ROC1 should be downloaded.
    • Click on the "Start" button to do a Prestart and Go. One can also first click on the Prestart button and then the Go button.
  • Setup of VME cpu a1nccvme
    • The boot script is at /home/vx/gc_test_2.5.boot . Script initiates one 792 TDC and one 792 QDC.
    • ROC task spawned as ROC1
  • Setup of KAEEL112 configuration in wmtest database.
    • For the event list use /home/vx/bbite/2.5/examples/crl/event_list.o
    • For readout of the QDC and TDC, the crl code is at /home/vx/bbite/newele_test.crl.
      • TDC setup in common stop mode with bin width of 222.5ns and sparsification on.
      • QDC setup with sparsification off.


Hardware Setup

There are two "paths" of interest to follow; the signal from the WLS, and the signal from the fingers. File:SetupTest.pdf

  • The fingers are each hooked to a Philips XP2282/B PMT, while the WLS/bar is hooked to a Philips XP2262/B PMT. The fingers share a common HV supply.
  • A model V792 ADC is used. Signals from each PMT pass into the ADC in the following channels:
    • Channel 1 -> Top finger
    • Channel 2 -> WLS/bar
    • Channel 3 -> Bottom finger

WLS

The raw signal from the WLS is fed into an amplifier (10x amplification). The amplified signal is then sent to an octal discriminator and to a delay box (200 ns delay) as two separate signals. The delayed signal is sent right to an ADC (wire 2, channel 1). The discriminated signal is sent to the level translator, translating NIM to ECL, which is sent to the TDC.

Fingers

Both signals are fed into a fan in/out. The signals are then sent to a delay box and to an octal discriminator as two separate paths. The delay box path (200 ns delay) goes right to the ADC. The discriminated signals go to a logic unit, which looks for coincidence between signals (the bottom signal is delayed 12 ns to control timing). When a coincidence is seen, the logic unit sends a signal to the ECL module. The ECL module then sends a signal to the MVME, which returns a level 1 accept to the ECL module. The level 1 accept is then translated to NIM and sent to a gate generator, which sends back a gate signal to the ECL module. The ECL module then translates this gate to an ECL signal, and sends a gate to the ADC and to the TDC (the TDC gate is delayed 100 ns).

Data runs

  • Run 2627 .
    • Machined bar
    • Start time: Fri June 27th 17:54
    • Stop time : Mon June 30th 9:33
    • Total events: 2165
    • Top scintillator HV=-1700. No amplifier. Threshold = -60mV . Use linear FI/FO to 200ns delay to ADC Chan 0.
    • Bottom scintillator HV=-1700. No amplifier. Threshold = -60mV . Use linear FI/FO to 200ns delay to ADC Chan 3. Did not see ADC signal in data. Switch signal to ADC chan 0 and saw signal in earlier run.
    • WLS fiber bar HV = -1700. Amplifier 10x to 200ns delay to ADC Chan 2. Threshold = -350mV .
    • Trigger is coincidenc between top and bottom . Gate widths are 30ns with the bottom delayed by 12ns.
    • Gate width to the ADC is 310ns.
  • Run 2635
    • Machined bar
    • Trigger on bottom finger
    • WLS fiber HV = -1700V
    • Finger HV = -2300V
    • 100126 events
  • Run 2636
    • Machined bar
    • Same as run 2635, except WLS HV = -1750V
    • Start: June 30 @ 13:21
    • Stop : June 30 @ 14:03
    • 100086 events
  • Run 2637
    • Machined bar
    • Same as run 2636
    • Start: June 30 @ 14:50
    • Stop : June 30 @ 15:36
    • 100078 events
  • Run 2638
    • Machined bar
    • Trigger on coincidence
    • WLS HV = -1700V, threshold = -200mV
    • Finger HV = -1700V, threshold = -40mV
    • Start: June 30 @ 16:40
    • Stop : July 1 @ 13:19
    • 802 events
  • Run 2639
    • Machined bar
    • Added 100ns delay to bottom finger to measure accidental rate, same as 2638 otherwise.
    • No accidentals after 1.5 hours.
  • Run 2645
    • Machined bar
    • Measuring cosmics
    • Gate = 80ns
    • WLS HV = -1750V, threshold = -200mV
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on coincidence
    • Fibers glued to PMT face
    • Start: July 2 @ 15:03
    • Stop : July 3 @ 11:12
    • 772 events
    • Bar placed with long side of cross section between fingers. Front of top finger was 22cm from the edge of the bar. The fiber was closer to the top finger.
  • Run 2646
    • Machined bar
    • Measuring pedestal
    • Gate = 80ns
    • WLS HV = 0V, threshold = -200mV
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on either finger
    • Fibers glued to PMT face
    • Start: July 3 @ 11:15
    • Stop : July 3 @ 11:20
    • 260 events
  • Run 2647
    • Machined bar
    • Measuring cosmics
    • Gate = 80ns
    • WLS HV = -1750V, threshold = -200mV
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on coincidence
    • Fibers glued to PMT face
    • Start: July 3 @ 12:00
    • Stop : July 3 @ 15:26
    • 156 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 1.5cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 22cm from edge of bar, fiber was closer to structure support.
  • Run 2649
    • Machined bar
    • Measuring single electron
    • Gate = 80ns
    • WLS HV = -1750V, threshold = -200mV
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on gate module random trigger
    • Fibers glued to PMT face
    • Start: July 3 @ 16:18
    • Stop : July 3 @ 16:19
    • 726000 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 1.5cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 22cm from edge of bar, fiber was closer to structure support.
  • Run 2650
    • Machined bar
    • Measuring cosmics
    • Gate = 80ns
    • WLS HV = -1750V, threshold = -200mV
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on coincidence
    • Fibers glued to PMT face
    • Start: July 3 @ 17:05
    • Stop : July 4 @ 11:30
    • 757 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 2.5cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 22cm from edge of bar, fiber was closer to structure support.
  • Run 2651
    • Machined bar
    • Measuring cosmics
    • Gate = 80ns
    • WLS HV = -1750V, threshold = -200mV
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on coincidence
    • Fibers glued to PMT face
    • Start: July 4 @ 11:44
    • Stop : July 5 @ 13:06
    • 1029 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 0.9cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 22cm from edge of bar, fiber was closer to structure support.
  • Run 2652
    • Machined bar
    • Measuring cosmics
    • Gate = 80ns
    • WLS HV = -1750V, threshold = -200mV
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on coincidence
    • Fibers glued to PMT face
    • Start: July 5 @ 13:10
    • Stop : July 3 @ 11:49
    • 947 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 1cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 7cm from edge of bar, fiber was closer to structure support.
  • Run 2653
    • Machined bar
    • Measuring cosmics
    • Gate = 80ns
    • WLS HV = -1750V, threshold = -200mV
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on coincidence
    • Fibers glued to PMT face
    • Start: July 7 @ 8:40
    • Stop : July 7 @ 13:39
    • 207 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 0.9cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 39.1cm from edge of bar, fiber was closer to structure support.
  • Run 2655
    • Unmachined bar
    • Measuring cosmics
    • Gate = 80ns
    • WLS HV = -1750V, threshold = -200mV
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on coincidence
    • Fibers glued to PMT face
    • Start: July 8 @ 9:15
    • Stop : July 8 @ 13:54
    • 201 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 1.5cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 20.6cm from edge of bar, fiber was closer to structure support.
  • Run 2656
    • Unmachined bar
    • Measuring pedestal
    • Gate = 80ns
    • WLS HV = -1750V, threshold = -200mV
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on either finger
    • Fibers glued to PMT face
    • Start: July 8 @ 14:07
    • Stop : July 8 @ 14:10
    • 261 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 1.5cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 20.6cm from edge of bar, fiber was closer to structure support.
  • Run 2658
    • Unmachined bar
    • Measuring single electron
    • Gate = 80ns
    • WLS HV = -1750V, threshold = -200mV
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on fast random trigger from gate module
    • Fibers glued to PMT face
    • Start: July 8 @ 14:13
    • Stop : July 8 @ 14:13
    • 720000 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 1.5cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 20.6cm from edge of bar, fiber was closer to structure support.


Note that up until this point, the fibers are suspected to have not fallen off of the face of the PMT. Runs from this point on with fibers glued to PMT face are suspect to having had the fibers become de-attached.


  • Run 2659
    • Unmachined bar, reflectors on fibers
    • Measuring cosmics
    • Gate = 80ns
    • WLS HV = -1750V, threshold = -200mV
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on coincidence
    • Fibers glued to PMT face
    • Start: July 8 @ 16:44
    • Stop : July 9 @ 9:58
    • 261 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 1.5cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 21cm from edge of bar, fiber was closer to structure support.
  • Run 2660
    • Unmachined bar, reflectors on fibers
    • Measuring single electron
    • Gate = 120ns
    • WLS HV = -1750V, threshold = -200mV
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on random fast trigger from gate module
    • Fibers glued to PMT face
    • Start: July 9 @ 10:00
    • Stop : July 9 @ 10:05
    • 706000 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 1.5cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 21cm from edge of bar, fiber was closer to structure support.


Added NINO here, attached fibers with a cookie and optical grease.


  • Run 2665
    • Machined bar
    • Measuring cosmic
    • Gate = 120ns
    • WLS HV = -1750V, NINO threshold set at 1.29V (essentially 0mV threshold)
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on coincidence
    • Fibers attached via cookie
    • Start: July 10 @ 16:49
    • Stop : July 11 @ 9:08
    • 681 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 2cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 24.5cm from edge of bar, fiber was closer to structure support.
  • Run 2667
    • Machined bar
    • Measuring pedestal
    • Gate = 120ns
    • WLS HV = 0V, NINO threshold set at 1.41V
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on either finger
    • Fibers attached via cookie
    • Start: July 11 @ 10:14
    • Stop : July 11 @ 10:17
    • 282 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 2cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 24.5cm from edge of bar, fiber was closer to structure support.
  • Run 2669
    • Machined bar
    • Measuring single electron
    • Gate = 120ns
    • WLS HV = -1750V, NINO threshold set at 1.40V (~4mV threshold)
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on NINO or one of the fingers
    • Fibers attached via cookie
    • Start: July 11 @ 10:56
    • Stop : July 11 @ ?
    •  ? events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 2cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 24.5cm from edge of bar, fiber was closer to structure support.
  • Run 2672
    • Machined bar
    • Measuring single electron
    • Gate = 120ns
    • WLS HV = -1750V, NINO threshold set at 1.35
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on NINO or one of the fingers
    • Fibers attached via cookie
    • Start: July 11 @ 11:09
    • Stop : July 11 @ 11:10
    •  ? events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 2cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 24.5cm from edge of bar, fiber was closer to structure support.
  • Run 2672
    • Machined bar
    • Measuring single electron
    • Gate = 120ns
    • WLS HV = -1750V, NINO threshold set at 1.32V
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on NINO or one of the fingers
    • Fibers attached via cookie
    • Start: July 11 @ ?
    • Stop : July 11 @ ?
    •  ? events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 2cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 24.5cm from edge of bar, fiber was closer to structure support.
  • Run 2675
    • Machined bar
    • Measuring single electron
    • Gate = 120ns
    • WLS HV = -1750V, NINO threshold set at 1.40V (~4mV threshold)
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on fast trigger from gate module
    • Fibers attached via cookie
    • Start: July 11 @ 11:22
    • Stop : July 11 @ 11:37
    • ~700000 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 2cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 24.5cm from edge of bar, fiber was closer to structure support.
  • Run 2676
    • Machined bar
    • Measuring single electron
    • Gate = 120ns
    • WLS HV = -1950V, NINO threshold set at 1.40V (~4mV threshold)
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on NINO or one of the fingers
    • Fibers attached via cookie
    • Start: July 11 @ 11:49
    • Stop : July 11 @ 11:50
    •  ? events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 2cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 24.5cm from edge of bar, fiber was closer to structure support.
  • Run 2677
    • Machined bar
    • Measuring single electron
    • Gate = 120ns
    • WLS HV = -1850V, NINO threshold set at 1.40V (~4mV threshold)
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on NINO or one of the fingers
    • Fibers attached via cookie
    • Start: July 11 @ 11:57
    • Stop : July 11 @ 11:59
    •  ? events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 2cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 24.5cm from edge of bar, fiber was closer to structure support.
  • Run 2679
    • Machined bar
    • Measuring cosmic
    • Gate = 120ns
    • WLS HV = -1850V, NINO threshold set at 1.40V (~4mV threshold)
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on finger coincidence
    • Fibers attached via cookie
    • Start: July 11 @ 12:08
    • Stop : July 11 @ 16:39
    • 177 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 2cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 24cm from edge of bar, fiber was closer to structure support.
  • Run 2690
    • Machined bar
    • Measuring single electron
    • Gate = 120ns
    • WLS HV = -1800V, NINO threshold set at 1.40V (~4mV threshold)
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on NINO only
    • Fibers attached via cookie
    • Start: July 12 @ 11:25
    • Stop : July 12 @ 11:26
    • 290000 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 2cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 24cm from edge of bar, fiber was closer to structure support.
  • Run 2691
    • Machined bar
    • Measuring single electron
    • Gate = 120ns
    • WLS HV = -1900V, NINO threshold set at 1.40V (~4mV threshold)
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on NINO only
    • Fibers attached via cookie
    • Start: July 12 @ 11:34
    • Stop : July 12 @ 11:35
    • 250000 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 2cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 24cm from edge of bar, fiber was closer to structure support.
  • Run 2692
    • Machined bar
    • Measuring single electron
    • Gate = 120ns
    • WLS HV = -1850V, NINO threshold set at 1.40V (~4mV threshold)
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on NINO only
    • Fibers attached via cookie
    • Start: July 12 @ 11:38
    • Stop : July 12 @ 11:40
    • 177 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 2cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 24cm from edge of bar, fiber was closer to structure support.
  • Run 2694
    • Machined bar
    • Measuring pedestal
    • Gate = 120ns
    • WLS HV = -0V, NINO threshold set at 1.40V (~4mV threshold)
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on either finger
    • Fibers attached via cookie
    • Start: July 12 @ 11:47
    • Stop : July 12 @ 11:50
    • 306 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 2cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 24cm from edge of bar, fiber was closer to structure support.
  • Run 2695
    • Machined bar
    • Measuring cosmic
    • Gate = 120ns
    • WLS HV = -1850V, NINO threshold set at 1.40V (~4mV threshold)
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on coincidence
    • Fibers attached via cookie
    • Start: July 12 @ 11:57
    • Stop : July 13 @ 11:46
    • 1075 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 2.9cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 24.5cm from edge of bar, fiber was closer to structure support.
  • Run 2697
    • Machined bar
    • Measuring single electrons
    • Gate = 120ns
    • WLS HV = -1850V, NINO threshold set at 1.40V (~4mV threshold)
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on NINO only
    • Fibers attached via cookie
    • Start: July 13 @ 11:59
    • Stop : July 13 @ 12:00
    • 870000 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 2.9cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 24.5cm from edge of bar, fiber was closer to structure support.
  • Run 2699
    • Machined bar
    • Measuring cosmic
    • Gate = 120ns
    • WLS HV = -1850V, NINO threshold set at 1.40V (~4mV threshold)
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on coincidence
    • Fibers attached via cookie
    • Start: July 13 @ 12:15
    • Stop : July 14 @ 16:05
    •  ? events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 1.2cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 24.5cm from edge of bar, fiber was closer to structure support.
  • Run 2700
    • Machined bar
    • Measuring cosmic
    • Gate = 120ns
    • WLS HV = -1850V, NINO threshold set at 1.40V (~4mV threshold)
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on coincidence
    • Fibers attached via cookie
    • Start: July 13 @ 16:08
    • Stop : July 14 @ 8:43
    • 665 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 1.5cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 5.5cm from edge of bar, fiber was closer to structure support.
  • Run 2702
    • Machined bar
    • Testing NINO
    • Gate = 120ns
    • WLS HV = -1500V, NINO threshold set at 1.88V
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on NINO only
    • Fibers attached via cookie
    • Start: July 14 @ 9:13
    • Stop : July 14 @ 9:19
    • 1211 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 1.5cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 5.5cm from edge of bar, fiber was closer to structure support.
  • Run 2704
    • Machined bar
    • Testing NINO (10x amplification used)
    • Gate = 120ns
    • WLS HV = -1500V, NINO threshold set at 1.88V
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on coincidence
    • Fibers attached via cookie
    • Start: July 14 @ 9:29
    • Stop : July 14 @ ?
    •  ? events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 1.5cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 5.5cm from edge of bar, fiber was closer to structure support.
  • Run 2706
    • Coated bar
    • Testing cosmics
    • Gate = 120ns
    • WLS HV = -1850V, NINO threshold set at 1.40V
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on coincidence
    • Fibers attached via cookie
    • Start: July 14 @ 15:44
    • Stop : July 15 @ 8:42
    • 1211 events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 2cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 21.5cm from edge of bar, fiber was closer to structure support.
  • Run 2708
    • Coated bar
    • Testing NINO (10x amplification used)
    • Gate = 120ns
    • WLS HV = -1500V, NINO threshold set at 1.50V
    • Finger HV = -1800V, threshold = -50mV
    • Trigger on coincidence
    • Fibers attached via cookie
    • Start: July 15 @ 8:52
    • Stop : July 15 @ 9:19
    • --- events
    • Bar placed with thin side of cross section between fingers. Top finger edge was 2cm from edge of bar (edge that's further from supporting beam of structure), front of finger was 21.5cm from edge of bar, fiber was closer to structure support.

June 24, 2014

Set up most of the modules required to collect data; gate generator still needs to be hooked up after the level 1 alert is sent from the computer. Important information includes:

  • Threshold of top finger was set to -40 mV in an octal discriminator.
  • Threshold of bottom finger was set to -50 mV in the same octal discriminator, different port.
  • Threshold of the WLS/bar was set to -10 mV (to be double checked) in a separate 16-channel discriminator.
  • Bottom finger signal is delayed by 12.5 ns, relative to the top finger signal, passing from the discriminator into the logic module (so that coincidence timing depends on the bottom finger). 12.5 ns offset allows sufficient buffer against spread in incoming logical signal times due to analog signals of different magnitude.
Retrieved from "https://hallaweb.jlab.org/wiki/index.php?title=CDET_scintillator_test&oldid=21158"