Difference between revisions of "PePPO 03132012"

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=Accelerator Configuration=
  
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;Accelerator Settings
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{| border="1"
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| beam energy || 6.8 MeV
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|-
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| Beam type: ||  Electron
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|-
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| I_average:    || 0.3 nA
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|-
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| I_peak:    || 0.05<math> \mu</math> A 0.006 duty factor
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|-
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| pulse width:|| 10 <math>\mu</math>s  (it seems on 200 <math> \mu</math>s is possible?)
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|-
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| Rate:|| 60 Hz
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|-
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| PEPPO Spectrometer:|| 151.3 A
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|-
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|}
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= Set HV to Detectors  =
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{| border="1"  |cellpadding="20" cellspacing="0
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|-
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|                || Signal channel  || HV dac || HV (V)
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|-
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|  Detectors #1  || A1  || 2.4 || 960
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|-
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|  Detectors #2  || A2  || 3.0 || 1200
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|-
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|}
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[https://positron.jlab.org/wiki/index.php/PEPPo_Annihilation_Counter_Descriptions#Turning_on_HV_PS How to turn HV On]
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=Scope Pictures=
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CH1: Beam Sync
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CH2: A1
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CH3: A2
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{| border="1"  |cellpadding="20" cellspacing="0
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|-
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| Target|| Pictures
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|-
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|    No Target || [[File:1_03132012_AnnhCountScopePic.png| 200 px]] [[File:2_03132012_AnnhCountScopePic.png| 200 px]]
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|-
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|    Chromox Target|| [[File:3_03132012_AnnhCountScopePic.png| 200 px]]  [[File:4_03132012_AnnhCountScopePic.png| 200 px]]
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|}
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= Run Plan=
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;Signal Definitions for Trigger logic
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:SYNC:=60 Hz sync pulse 200 micro seconds long
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:Det1:= Annihilation Counter #1 (HV1)
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:Det2:=Annihilation Counter #2 (HV2)
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Please make the following measurements
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{| border="1"  |cellpadding="20" cellspacing="0
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|-
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| Run#|| run mode|| Run length ||Beam||Target ||Trig Logic||  VME discriminator Threshold (mV)|| HV1 (setting/V) || HV2 (setting/V) || PL (setting/ns)|| PTW (setting/ns)
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|-
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|  2902  || sample  || 5 minutes || e<math>^-</math> ||  Chromox  ||  (Det1 OR Det2) ||                      50        ||  2.4/960      ||    3/1200      ||      ||
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|-
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|  2903  || sample  || 5 minutes ||e<math>^-</math>  ||  Empty  ||    (Det1 OR Det2) ||                      50        ||  2.4/960      ||    3/1200      ||      ||   
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|-
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|  2905 || sample  || 10 minutes || e<math>^-</math> || Chromox  ||  Det1 AND Det2||                      50        ||  2.4/960      ||    3/1200      ||        ||   
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|-
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|  2904  || sample  || 15 minutes ||e<math>^-</math>  ||  Empty  ||  Det1 AND Det2 ||                      50        ||  2.4/960      ||    3/1200      ||      ||   
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|-
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|    2908 || sample  || 30 minutes After Beam Studies end || off  ||  out  ||    (Det1 or Det2) ||                      50        ||  2.4/960      ||    3/1200      ||        ||   
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|-
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|    2909 || sample  || 30 minutes After Beam Studies end || off  ||  out  ||    (Det1 AND Det2) ||                      50        ||  2.4/960      ||    3/1200      ||        ||   
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|-
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|}

Revision as of 01:34, 14 March 2012

Accelerator Configuration

Accelerator Settings
beam energy 6.8 MeV
Beam type: Electron
I_average: 0.3 nA
I_peak: 0.05[math] \mu[/math] A 0.006 duty factor
pulse width: 10 [math]\mu[/math]s (it seems on 200 [math] \mu[/math]s is possible?)
Rate: 60 Hz
PEPPO Spectrometer: 151.3 A

Set HV to Detectors

Signal channel HV dac HV (V)
Detectors #1 A1 2.4 960
Detectors #2 A2 3.0 1200

How to turn HV On


Scope Pictures

CH1: Beam Sync CH2: A1 CH3: A2

Target Pictures
No Target 1 03132012 AnnhCountScopePic.png 2 03132012 AnnhCountScopePic.png
Chromox Target 3 03132012 AnnhCountScopePic.png 4 03132012 AnnhCountScopePic.png

Run Plan

Signal Definitions for Trigger logic
SYNC:=60 Hz sync pulse 200 micro seconds long
Det1:= Annihilation Counter #1 (HV1)
Det2:=Annihilation Counter #2 (HV2)


Please make the following measurements


Run# run mode Run length Beam Target Trig Logic VME discriminator Threshold (mV) HV1 (setting/V) HV2 (setting/V) PL (setting/ns) PTW (setting/ns)
2902 sample 5 minutes e[math]^-[/math] Chromox (Det1 OR Det2) 50 2.4/960 3/1200
2903 sample 5 minutes e[math]^-[/math] Empty (Det1 OR Det2) 50 2.4/960 3/1200
2905 sample 10 minutes e[math]^-[/math] Chromox Det1 AND Det2 50 2.4/960 3/1200
2904 sample 15 minutes e[math]^-[/math] Empty Det1 AND Det2 50 2.4/960 3/1200
2908 sample 30 minutes After Beam Studies end off out (Det1 or Det2) 50 2.4/960 3/1200
2909 sample 30 minutes After Beam Studies end off out (Det1 AND Det2) 50 2.4/960 3/1200
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