PePPO 03132012: Difference between revisions

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=Accelerator Configuration=


;Accelerator Settings
{| border="1"
| 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  =
{| border="1"  |cellpadding="20" cellspacing="0
|-
|                || Signal channel  || HV dac || HV (V)
|-
|  Detectors #1  || A1  || 2.4 || 960
|-
|  Detectors #2  || A2  || 3.0 || 1200
|-
|}
[https://positron.jlab.org/wiki/index.php/PEPPo_Annihilation_Counter_Descriptions#Turning_on_HV_PS How to turn HV On]
=Scope Pictures=
CH1: Beam Sync
CH2: A1
CH3: A2
{| border="1"  |cellpadding="20" cellspacing="0
|-
| Target|| Pictures
|-
|    No Target || [[File:1_03132012_AnnhCountScopePic.png| 200 px]] [[File:2_03132012_AnnhCountScopePic.png| 200 px]]
|-
|    Chromox Target|| [[File:3_03132012_AnnhCountScopePic.png| 200 px]]  [[File:4_03132012_AnnhCountScopePic.png| 200 px]]
|}
= 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)
{| border="1"  |cellpadding="20" cellspacing="0
|-
| 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%      ||    [[File:peppo-032302012-r2905-A1.png | 300 px]] [[File:peppo-032302012-r2905-A2.png | 300 px]]
|-
| 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%    ||   
|-
|}
= data analysis =
==Negative Energy ? ==
This run 2902, Int_Ch14 histogram. Why there is negative?
[[File:peppo-032302012-r2902-int14-negative.png | 700 px]]
== Pulses ==
=== run 2905 ===
1st 100 puleses
[[File:PePPO-03132012-pulses-2905-1to100.png | 400 px]]
pulse that only partially read-in:
[[File:PePPO-03132012-pulses-2905-1-pulse-cut-off.png | 400 px]]
[[File:PePPO-03132012-pulses-2905-9th-pulse-cut-off.png | 400 px]]
first 10 pulses, some pulses that only partially read-in:
[[File:PePPO-03132012-pulses-2905-10-pulse-cut-off.png | 400 px]]
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.
[[File:PePPO-03132012-pulses-selection-try-1.png | 400 px]]
Why CH14 histogram is all positive, but int_14 histogram has negatives?
[[File:PePPO-03132012-pulses-2905-CH14-Hist.png | 400 px]]
[[File:PePPO-03132012-pulses-2905-int_14-Hist.png | 400 px]]
==TF Analysis==
Using the following ROOT programs
[[Media:03212012_T.C.txt]]
[[Media:03212012_T.h.txt]]
{| border="1"  |cellpadding="20" cellspacing="0
|-
| 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%    ||    [[File:03212012_Ch14r2904.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%  ||    [[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%    ||   
|-
|}
Run 2904 and 2905 coincidence overlay (NOT Deadtime corrected)
[[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[math]\displaystyle{ \mu }[/math] A 0.006 duty factor
pulse width: 10 [math]\displaystyle{ \mu }[/math]s (it seems on 200 [math]\displaystyle{ \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
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[math]\displaystyle{ ^- }[/math] Chromox (Det1 OR Det2) 50 2.4/960 3/1200 93.1818% [math]\displaystyle{ \pm }[/math] 10.3874%
2903 sample 203 e[math]\displaystyle{ ^- }[/math] Empty (Det1 OR Det2) 50 2.4/960 3/1200 84.9788% [math]\displaystyle{ \pm }[/math]0.106622%
2904 sample 452 e[math]\displaystyle{ ^- }[/math] Empty Det1 AND Det2 50 2.4/960 3/1200 12.2563% [math]\displaystyle{ \pm }[/math] 2.32772%
2905 sample 556 e[math]\displaystyle{ ^- }[/math] Chromox Det1 AND Det2 50 2.4/960 3/1200 3.16901% [math]\displaystyle{ \pm }[/math] 4.2301%
2908 sample 150 off out (Det1 or Det2) 50 2.4/960 3/1200 74.0667% [math]\displaystyle{ \pm }[/math] 0.157206%
2909 sample 1118 off out (Det1 AND Det2) 50 2.4/960 3/1200 3.57143% [math]\displaystyle{ \pm }[/math]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

Media:03212012_T.C.txt

Media:03212012_T.h.txt


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]\displaystyle{ ^- }[/math] Chromox (Det1 OR Det2) 50 2.4/960 3/1200 93.1818% [math]\displaystyle{ \pm }[/math] 10.3874%
2903 sample 203 e[math]\displaystyle{ ^- }[/math] Empty (Det1 OR Det2) 50 2.4/960 3/1200 84.9788% [math]\displaystyle{ \pm }[/math]0.106622%
2904 sample 452 e[math]\displaystyle{ ^- }[/math] Empty Det1 AND Det2 50 2.4/960 3/1200 12.2563% [math]\displaystyle{ \pm }[/math] 2.32772%
2905 sample 556 e[math]\displaystyle{ ^- }[/math] Chromox Det1 AND Det2 50 2.4/960 3/1200 3.16901% [math]\displaystyle{ \pm }[/math] 4.2301%
2908 sample 150 off out (Det1 or Det2) 50 2.4/960 3/1200 74.0667% [math]\displaystyle{ \pm }[/math] 0.157206%
2909 sample 1118 off out (Det1 AND Det2) 50 2.4/960 3/1200 3.57143% [math]\displaystyle{ \pm }[/math]26.9725%

Run 2904 and 2905 coincidence overlay (NOT Deadtime corrected)

Normalizing using run time and correcting for DAQ deadtime:

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