Difference between revisions of "PePPO 03132012"
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| 2905|| sample || 556 || e<math>^-</math> || Chromox || Det1 AND Det2 || 50 || 2.4/960 || 3/1200 || 3.16901% <math>\pm</math> 4.2301% || [[File:03212012_Ch14r2905.png| 200 px]] | | 2905|| sample || 556 || e<math>^-</math> || Chromox || Det1 AND Det2 || 50 || 2.4/960 || 3/1200 || 3.16901% <math>\pm</math> 4.2301% || [[File:03212012_Ch14r2905.png| 200 px]] | ||
|- | |- | ||
| − | | 2908|| sample || 150 || off || out || (Det1 or Det2) || 50 || 2.4/960 || 3/1200 || 74.0667% <math>\pm</math> 0.157206% || | + | | 2908|| sample || 150 || off || out || (Det1 or Det2) || 50 || 2.4/960 || 3/1200 || 74.0667% <math>\pm</math> 0.157206% || [[File:03212012_Ch14r2908.png| 200 px]] |
|- | |- | ||
| 2909|| sample || 1118 || off || out || (Det1 AND Det2) || 50 || 2.4/960 || 3/1200 || 3.57143% <math>\pm</math>26.9725% || | | 2909|| sample || 1118 || off || out || (Det1 AND Det2) || 50 || 2.4/960 || 3/1200 || 3.57143% <math>\pm</math>26.9725% || | ||
| Line 171: | Line 171: | ||
[[File:03212012_Coinc2904-5.png | 200 px]] | [[File:03212012_Coinc2904-5.png | 200 px]] | ||
| + | |||
| + | Normalizing using run time and correcting for DAQ deadtime: | ||
| + | |||
| + | [[File:03212012_NormCoinc2904-5.png | 200 px]] | ||
Latest revision as of 06:35, 22 March 2012
Accelerator Configuration
- Accelerator Settings
| beam energy | 6.8 MeV |
| Beam type: | Electron |
| I_average: | 0.3 nA |
| I_peak: | 0.05 A 0.006 duty factor |
| pulse width: | 10 s (it seems on 200 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 |
Scope Pictures
CH1: Beam Sync CH2: A1 CH3: A2
| Target | Pictures |
| No Target |  
|
| Chromox Target |  
|
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 | Chromox | (Det1 OR Det2) | 50 | 2.4/960 | 3/1200 | 93.1818% 10.3874% | |
| 2903 | sample | 203 | e | Empty | (Det1 OR Det2) | 50 | 2.4/960 | 3/1200 | 84.9788% 0.106622% | |
| 2904 | sample | 452 | e | Empty | Det1 AND Det2 | 50 | 2.4/960 | 3/1200 | 12.2563% 2.32772% | |
| 2905 | sample | 556 | e | Chromox | Det1 AND Det2 | 50 | 2.4/960 | 3/1200 | 3.16901% 4.2301% |  
|
| 2908 | sample | 150 | off | out | (Det1 or Det2) | 50 | 2.4/960 | 3/1200 | 74.0667% 0.157206% | |
| 2909 | sample | 1118 | off | out | (Det1 AND Det2) | 50 | 2.4/960 | 3/1200 | 3.57143% 26.9725% |
data analysis
Negative Energy ?
This run 2902, Int_Ch14 histogram. Why there is negative?
Pulses
run 2905
1st 100 puleses
pulse that only partially read-in:
first 10 pulses, some pulses that only partially read-in:
looks like some pulses are only partially read-in. We need to delay signal more?
One possible cut may to determine if the signal is increasing within the first 100 - 300 $Iterations. This would be like creating a leading edge discriminator in software.
T->Draw("CH14:Iteration$","Iteration$<300 & CH14<100","L",10,1)
looks like it just won't draw. I need to know the to way exclude that event does not satisfy "Iteration$<300 & CH14<100" requirement.
Why CH14 histogram is all positive, but int_14 histogram has negatives?
TF Analysis
Using the following ROOT programs
| 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 | Chromox | (Det1 OR Det2) | 50 | 2.4/960 | 3/1200 | 93.1818% 10.3874% | |
| 2903 | sample | 203 | e | Empty | (Det1 OR Det2) | 50 | 2.4/960 | 3/1200 | 84.9788% 0.106622% | |
| 2904 | sample | 452 | e | Empty | Det1 AND Det2 | 50 | 2.4/960 | 3/1200 | 12.2563% 2.32772% | 
|
| 2905 | sample | 556 | e | Chromox | Det1 AND Det2 | 50 | 2.4/960 | 3/1200 | 3.16901% 4.2301% | 
|
| 2908 | sample | 150 | off | out | (Det1 or Det2) | 50 | 2.4/960 | 3/1200 | 74.0667% 0.157206% | 
|
| 2909 | sample | 1118 | off | out | (Det1 AND Det2) | 50 | 2.4/960 | 3/1200 | 3.57143% 26.9725% |
Run 2904 and 2905 coincidence overlay (NOT Deadtime corrected)
Normalizing using run time and correcting for DAQ deadtime:
