Difference between revisions of "PePPO 03132012"

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Why there is negative?  
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This run 2902, Int_Ch14 histogram. Why there is negative?  
  
 
[[File:peppo-032302012-r2902-int14-negative.png | 700 px]]
 
[[File:peppo-032302012-r2902-int14-negative.png | 700 px]]

Revision as of 16:26, 15 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

Annihilation Counter Runs

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



Run# run mode Run length (sec) Beam Target Trig Logic VME discriminator Threshold (mV) HV1 (setting/V) HV2 (setting/V) Deadtime
2902 sample 0 e[math]^-[/math] Chromox (Det1 OR Det2) 50 2.4/960 3/1200 93.1818% [math]\pm[/math] 10.3874%
2903 sample 203 e[math]^-[/math] Empty (Det1 OR Det2) 50 2.4/960 3/1200 84.9788% [math]\pm[/math]0.106622%
2904 sample 452 e[math]^-[/math] Empty Det1 AND Det2 50 2.4/960 3/1200 12.2563% [math]\pm[/math] 2.32772%
2905 sample 556 e[math]^-[/math] Chromox Det1 AND Det2 50 2.4/960 3/1200 3.16901% [math]\pm[/math] 4.2301%
2908 sample 150 off out (Det1 or Det2) 50 2.4/960 3/1200 74.0667% [math]\pm[/math] 0.157206%
2909 sample 1118 off out (Det1 AND Det2) 50 2.4/960 3/1200 3.57143% [math]\pm[/math]26.9725%

This run 2902, Int_Ch14 histogram. Why there is negative?

Peppo-032302012-r2902-int14-negative.png