Logbook

1. Discriminators: All at 15 mV

1. Discriminators: All at 15 mV

1. Discriminators: 50 mV

1. Discriminators: 40 mV

1. Channels from 0 - 31 are from NIM/ECL AND from Blue camac disc
2. Channels from 32 - 63 are from Black Camac disc

Configuration being saved in conf_040710_cm1.txt

Trigger time in CH 0 of the NIM ECL translator

• TDC: RED cables from 1 - 24
  1. Cables 1 - 3 : splitted to acquire Both Time AND Charge. Go to Nim - Ecl translator Ch 10 - 11 - 12. [Guess TDC 9,10,11]
  2. Cables 4 - 21 : Camac discriminators .. last 2 chs of 1° black disc + ALL 2° black disc
  3. Cables 22 - 24 : NIM discriminator .. (2° NIM !io discriminator). Go to Nim - Ecl translator Ch 13 - 14 - 15. [Guess TDC 12,13,14]
• QDC: red cables from 1 - 3
  1. Cables 1 - 3 : From io Nim disc to Channels 8 - 10 QDC. Delay of 200 ns

• TDC: black cables from 0 - 31
  1. Cables 0 - 3 : splitted to acquire Both Time AND Charge. Go to Nim - Ecl translator Ch 6 - 7 - 8 - 9. [Guess TDC 5,6,7,8]
  2. Cables 4 - 31 : Camac discriminators .. All blue camac discr [4-18] + first 14 channels of 1° camac black disc [19-31].
• QDC: black cables from 0 - 3
  1. Cables 0 - 3 : From io Nim disc to Channels 4 - 7 QDC. Delay of 200 ns

• TDC: black cables from 32 - 33. Nim io discriminator. Go to Nim - Ecl translator Ch 2 - 3. [Guess TDC 1,2]
• QDC: black cables from 32 - 33
  1. Cables 32 - 33 : From linear Fan IO to Channels 0 - 1 QDC. Delay of 100 ns

• TDC: black cables from 34 - 35. Nim io discriminator. Go to Nim - Ecl translator Ch 4 - 5. [Guess TDC 3,4]
• QDC: black cables from 34 - 35
  1. Cables 34 - 35 : From linear Fan IO to Channels 2 - 3 QDC. Delay of 100 ns

• TDC: red cables from 25 - 26. Nim discriminator. NOT BEING ACQUIRED.
• QDC: red cables from 25 - 26. Nim discriminator. NOT BEING ACQUIRED.

After proper shaping of NaI signals we see also times in the Beam Dump. Brought HV of Old Chamber to 2.0 kV. Now NaI is acquired and Start Counter is not

1. OLD CHmb cable 14 11 blue discriminator
2. New Chmb cable 13 8 second black discriminator

• HV old : 2.2, HV new 2.3; BD HV 1.65 kV; BD is not attenuated. First Beam studies started at ~20:00
• Collimator is not used (just the 3cm before the SC). Picture is obtained… PMMA has been removed by Francesco.

• First run:: data/run_5jul10_beam1.txt . Slowly getting the BEAM. They are opening the BEAM, with increasing Freq. Started with Less than 1 Hz. QDC Channel 4 on the SCOPE
• Second run:: data/run_5jul10_beam2.txt 7 channels (-1 that is curren.ty looked at on the scope) are being attenuated. BD no attenuation. QDC channel 4 and 8 on the scope

• Third run:: data/run_5jul10_beam3.txt . All QDC channels connected Channels cannot be attenuated more. They are saturating the QDC. Try to go down with HV. New Chamber 2.1kV , Old CHmb 2.1 kV.
• QDC seems broken (20:43). several run beam3 –> beam6 done as study.
• Delayed CH 32 about 5 ns to remove time jitter of BD.

Both QDC and SC are not working…. Struggling to see something

• Recovered QDC: was going in busy state: needed few read cycles to exit from busy. 23:30 We start to see something again
• First Beam Dump reasonable peak: data/run_5jul10_beam13.txt
• Start counter is a ~ complete failure: NO signal on QDC [noise ~ + baseline subtracting charge from pedestal]. Time resolution ~3 ns.
• 00:53 decided to go for a scan of HV of the DCH.
  1. First points 1.6 kV. Chamber is attenuated. Beam dump is not anymore attenuated run_6jul10_beam1 . Attenuated @ 0.5 all the wire chambers to the QDC

• Preparing night acq. Threshold Start Counter moved to 30 mV for night acquisition. HV of all the chambers is 2.2 kV. Mixture still 80/20. Attenuate the Beam Dump (only 1 channel). Removed all the attenuators from the NEW chamber signals [chs 8,9,10 of QDC].
• Acquired 1.5M events in ~ 3 hours. run_6jul10_allnight with conf_050710_beam2 configuration.

There is a good chance that all the data below that are screwed, due to gas flow problems.

• Started the scans @ high L for the S-T relations measurements: 2 other points at 2.3 and 2.1 kV with 300k events each are foreseen:
  1. data/run_6jul10_stscan2.3.txt : 300k @ 2.3 kV for both chambers.
  2. data/run_6jul10_stscan2.1.txt : 300k @ 2.1 kV for both chambers.
• 7:55 Raised the thresholds to 70 mV for all the Chambers channels. First scan point @ 2.1 kV
  1. data/run_6jul10_stscan2.1_70mV.txt
  2. data/run_6jul10_stscan2.2_70mV.txt
  3. data/run_6jul10_stscan2.3_70mV.txt
• 10:00 Finished the Scan. Change the Start counter and go to get breakfast… 2.3 kV , 70mV Now we have the collimator
  1. data/run_6jul10_Collim2.3_70mV.txt :: 460 k events
• 11:20 Taking O(10)k events at low HV, High Th. 2.0 kV
  1. data/run_6jul10_Collim2.0_70mV.txt 20k
  2. data/run_6jul10_Collim1.9_70mV.txt 10k
  3. data/run_6jul10_Collim1.8_70mV.txt 10k

Major change of configuration. conf_060710_lunch

1. Old start counter gets in. [connected in place of the channels 1-2 of New Chamber]
2. 3x3 Scintillator gets in [connected in place of the channel 3 of New Chamber]
3. New Chamber chs 1-3 are TDC disconnected
4. Change of the delay of the New start counter. From 250 we go to 200ns each.
5. Connected Red cables 2,3 to Old start counter. Disc IN/out Chs 7-8.

After the major change of configuration we restarted to take the night data in steps of 100k evts.

1. First dataset with GAS OK: run_6jul10_Collim2.3_70mV_regas.txt 100k evts. Run with old+new Start Counter discriminator TH @ 20 mV. One HV Ch (Ch0:: U view of old chamber) is @ 2.2 kV
2. Second dataset @ 2.2 kV run_6jul10_Collim2.2_70mV_regas.txt . Old+new Start Counter Discriminator Thresholds now are at 30 mV
3. Second dataset @ 2.1 kV run_6jul10_Collim2.1_70mV_regas.txt . Old+new Start Counter Discriminator Thresholds now are at 15 mV

Note:

1. New Start Counter QDC channels 2,11
2. Old Start Counter QDC channels 8,9

1. New Chamber is Turned Off
2. Triggering on Beam Dump: we see just the events that are not STOPPED by the 3x3. ~60 Hz.
3. 6.5 k events taken in data/run_6jul10_3x3Dumper.txt
4. Added 3x3 to the trigger: 10k events taken in data/run_6jul10_3x3DumperTrig.txt Too much light
5. Damped the 3x3 signal by a factor of 4. run_6jul10_3x3DumperTrig_Attx4
6. Added a 3mm collimator to study the scotch: run_6jul10_3x3DumperTrig_Attx4_Coll3mm

1. High rate, triggering on the Beam Dump. [Forget about neutrals we do not have time]
2. HV chmb old is 2.2 kV
3. New Chmb has been un-cabled, powered off
4. Thresholds @ 70 mV …. Config file to be worked out
5. Meas 3: 3x3 delayed.