Difference between revisions of "12 10 2012 HRRL DetectorTests"

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=2/11/12=
+
=12/12/12=
  
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HRRL_12-12-12
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Worked on evaluating the background after the installation of 8" thick Pb wall in accelerator room and installing a FC, Scintillator, and Phosphorous screen at the end of the 90 degree line.
−
=RunPlan=
 
  
−
==BeamTune==
+
[[HRRL_Dec_12_2012Run]]
  
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Tune beam into zero line, max current, 10.5 MeV energy, 20 ns width, 300 Hz rep rate
+
=12/13/12=
  
−
For Reference, below is the the tune used on last day of July 2012 Positron run
+
Worked on establishing a small spot size on the Phosphorous target and then documenting the beam properties.
  
−
https://wiki.iac.isu.edu/index.php/Beam_Test_Jul_27_2012#Tune
+
[[HRRL_Dec_13_2012Run]]
  
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==Measure Emittance==
 
  
−
==Ilyusha Background measurements==
 
  
 +
=12/14/12=
  
−
Previous Background tests during 2n correlation run
+
Worked on establishing a small spot size on the Phosphorous target and then documenting the beam properties.
  
−
https://wiki.iac.isu.edu/index.php/2n_BKG_data
+
[[HRRL_Dec_14_2012Run]]
  
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HV=1000
+
=12/19/12=
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CFD = -12 mV
 
  
 +
[[HRRL_Dec_19_2012Run]]
  
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Previous run during neutron correlation experiment found 1 gamma/15 electron beam pulses
+
When Target T1 goes in and Accelerator side lights up( as viewed by scintillator Kelly) and Illyusha (when next to the beam exit window) also lights.
  
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Tune beam into zero line, max current, 10.5 MeV energy, 20 ns width, 300 Hz rep rate
+
There is no Pb around T1.
  
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1.) Take a run with no shielding around Ilyusha
+
Lets directionally shield Illyusha (when positioned next to the hallway) to determine how much lead to add around T1.
  
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2.) Move Pb bricks around the scintillator to determine direction of background
 
  
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3.) add shielding to accelerator
+
ADC3 = NaI Left
 +
ADC7 = NaI Right
  
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=== compare previous measurements & adjust threshold & Width ===
+
TDC 29 = NaI right
  
 +
TDC 31 = NaI left
  
−
 
+
{| border="1"
−
{| border="1" cellpadding="20" cellspacing="0"
+
| Area || Conditions
 
|-
 
|-
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| Rate (gamma/pulse)
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|800 \pm 130 pVs|| No shielding T1 in
−
| Beam COnfig (E,pulse width,peak current)
 
−
|Configuration
 
 
|-
 
|-
−
| 213/3746 =  1 /17 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 12 mV threshold on CFD, 255 ns CFD output pulse width (this width was sued in the 2n correlation exp)
+
|1600 \pm 200 pVs || 1 Pb brick (2") shielding T1 in Add Pb and signal goes up?  Just noise!
 
|-
 
|-
−
| 213/2343 = 1/11 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 12 mV threshold on CFD, 4 ns CFD output pulse width
+
| || Move Illyusha so it is right next to experimental side flag, no shielding.
 
|-
 
|-
−
|220/2374 = 1/11  ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 12 mV threshold on CFD, 100 ns CFD output pulse width
+
|}
 +
 
 +
==Take data using 3 MeV electrons on the T2 target. ==
 +
 
 +
The Scintillator known as Kelly is has an output of about 1 Volt.
 +
 
 +
{| border="1"
 +
| Run # || Configuration
 
|-
 
|-
−
| 53202/616 = nonsense  ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 0 mV threshold on CFD, 4 ns CFD output pulse width
+
|4611|| T1 and T2 are in, Veto discrimnator, ADC overflows , TDC31-TDC29 looks OK, 25 Hz counting rate
 
|-
 
|-
−
| 794/862 = 1/1  ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 2 mV threshold on CFD, 4 ns CFD output pulse width
+
|4612|| T1 and T2 are in, Veto discrimnator, cut the beam current in half, rate is 0.06 Hz
 
|-
 
|-
−
| 574/1213 = 1/2  ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 4 mV threshold on CFD, 4 ns CFD output pulse width
+
|4613|| T1 and T2 are in, Veto discrimnator, cut the beam current in half, rate is 4 Hz, lowered threshold from 20 to 7 mV
 
|-
 
|-
−
| 247/906 =  1/4 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 6 mV threshold on CFD, 4 ns CFD output pulse width
+
|4614|| T1 in  '''T2 out''', Veto discrimnator, cut the beam current in half, rate is 0.03 Hz
 
|-
 
|-
−
| 662/3914 = 1/6 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 8 mV threshold on CFD, 4 ns CFD output pulse width
+
|}
 +
 
 +
==Take data using 3 MeV '''Positrons''' on the T2 target. ==
 +
 
 +
The Scintillator known as Kelly is has an output of about 1 Volt.
 +
 
 +
ADC9 = NaI right
 +
 
 +
{| border="1"
 +
| Run # || Configuration
 
|-
 
|-
−
| 201/1328 = 1/6.6 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 10 mV threshold on CFD, 4 ns CFD output pulse width
+
|4621|| T1 and T2 are in, Veto discrimnator, threshold is 5 mV, Kelly at 3.5 Volt ,rate is 0.2 Hz
 +
|}
 +
 
 +
=12/20/2012=
 +
 
 +
[[HRRL_Dec_20_2012Run]]
 +
==RF noise measurement==
 +
 
 +
{| border="1"
 +
| Run # || Configuration || ADC3 || ADC9
 
|-
 
|-
−
|220/1580 = 1/7.2 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 14 mV threshold on CFD, 4 ns CFD output pulse width
+
|4625|| Na-22 Source run with RF no beam current || [[File:r4625_ADC3.png | 200 px]]|| [[File:r4625_ADC9.png | 200 px]]
 +
|}
 +
 
 +
{| border="1"  |cellpadding="20" cellspacing="0
 
|-
 
|-
−
|250/1176 = 1/5 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 12 mV threshold on CFD, 4 ns CFD output pulse width
+
| run#  || Mode and Energy || T1 || T2 || Sweep Magnet|| D1 and D2 (Amp) || logic || HV NaI Left (CH3) (Det#1) || HV NaI R Right (CH9) (Det#2) ||Dis Threshold Left ||Dis Threshold Right || Reprate  || start || stop || Run time (s)|| Int Rate ||comments || event || pulses
 
|-
 
|-
−
|252/937 = 1/4 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 10 mV threshold on CFD, 4 ns CFD output pulse width
+
| 4623  ||  3 MeV e+ on T2 ||in || in || out|| 5.8, 5.8 || (NaIL & GunTrig) & (NaIR & GunTrig) || 1100V || 1190V || 5 mV || 5 mV|| 300 || 16:43:26|| 16::||  ||  events/s||  beam pulses ||  ||
 
|-
 
|-
−
|221/917 = 1/4 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 12 mV threshold on CFD, 4 ns CFD output pulse width
+
|}
 +
 
 +
{| border="1" |cellpadding="20" cellspacing="0
 
|-
 
|-
−
|239/634 = 1/3  ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 8 mV threshold on CFD, 4 ns CFD output pulse width
+
| Run # || Source  || logic || Run starts  || Run ends || HV NaI Left (CH3) (Det#1) || HV NaI R Right (CH9) (Det#2) || Spectrum
 
|-
 
|-
−
|241/718 = 1/3 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 10 mV threshold on CFD, 4 ns CFD output pulse width
+
|  4624  || Na22  ||  NaI Right && NaI Left || 19:42:36 || 08:03:30 next day  || 1100 V || 1190 V  || ||   
−
|-
+
 
−
|222/819 = 1/4 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 12 mV threshold on CFD, 4 ns CFD output pulse width
+
|}
−
|-
 
−
| 241/1011 = 1/4 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 14 mV threshold on CFD, 4 ns CFD output pulse width
 
−
|-
 
−
| 246/884 = 1/4 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 12 mV threshold on CFD, 4 ns CFD output pulse width
 
−
|-
 
−
| 224/713 = 1/3 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 10 mV threshold on CFD, 4 ns CFD output pulse width
 
−
|-
 
−
| 242/561 = 1/2 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 8 mV threshold on CFD, 4 ns CFD output pulse width
 
−
|-
 
−
| 269/550 = 1/2 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 6 mV threshold on CFD, 4 ns CFD output pulse width
 
−
|-
 
−
| 254/666 = 1/3 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 8 mV threshold on CFD, 4 ns CFD output pulse width
 
−
|-
 
−
|250/755 = 1/3 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 10 mV threshold on CFD, 4 ns CFD output pulse width
 
−
|-
 
−
|233/775 = 1/3 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 12 mV threshold on CFD, 4 ns CFD output pulse width
 
−
|-
 
−
|205/754 = 1/3 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 14 mV threshold on CFD, 4 ns CFD output pulse width
 
−
|-
 
−
|204/718 = 1/3 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 12 mV threshold on CFD, 4 ns CFD output pulse width
 
−
|-
 
−
|214/760 = 1/3 ||10.5 MeV : 100 ns FWHM, 5.4 mA || UNshielded illyusha scintilltor, 10 mV threshold on CFD, 4 ns CFD output pulse width
 
−
|-
 
−
|390/808 = 1/2 ||10.5 MeV : 100 ns FWHM, 3.2 mA || UNshielded illyusha scintilltor, 6 mV threshold on CFD, 4 ns CFD output pulse width
 
−
|}<br>
 
  
 +
RF adds 50 channels of noise to NaI signal and moves Source peak forward.
  
−
beam current decreased from 5 to 3 mA during the measurements ; must measure beam current for each measurement.
+
RF was for 3 MeV electrons, perhaps RF for higher energy electrons will add the remaining 30 channels of noise on the NaI detectors.
  
−
[[File:12102012_CFDcal.jpg | 200 px]]
+
[[File:NaINoise_232425.png | 200 px]]
  
−
===Add 3 Pb Bricks to accelerator side===
+
==Positron attempt==
  
 +
{| border="1"
 +
| Run # || Configuration || ADC3 || ADC9
 +
|-
 +
|4632|| Transporting 3 MeV positrons, Looks like beam right (ADC9) has 511s beam left (ADC3) swamped with photons || [[File:r4632_ADC3.png | 200 px]]|| [[File:r4632_ADC9.png | 200 px]]
 +
|}
  
−
We discovered that a gate vavle was slowly closing due to a gas pressure problem.  This explains why the rates were dropping above during the threshold tests.
+
Need to shield beam left more.
  
−
{| border="1" cellpadding="20" cellspacing="0"
 
−
|-
 
−
| Rate (gamma/pulse)
 
−
| Beam COnfig (E,pulse width,peak current)
 
−
|Configuration
 
−
|-
 
−
| 51/3031 =  1/60  (.3 Hz) ||10.5 MeV : 100 ns FWHM, 6.8 mA, 20 Hz || 5" Pb in, UNshielded illyusha scintilltor, 10 mV threshold on CFD, 4 ns CFD output pulse width
 
−
|-
 
−
| 47/2307 = 1/50 ||10.5 MeV : 100 ns FWHM, 0 mA , RF on, 20 Hz|| 5" Pb in, UNshielded illyusha scintilltor, 10 mV threshold on CFD, 4 ns CFD output pulse width
 
−
|-
 
−
|70/3126 = 1/44 , 1/50 ||10.5 MeV : 100 ns FWHM, 6.8  mA , RF on, 20 Hz|| 5" Pb out, UNshielded illyusha scintilltor, 10 mV threshold on CFD, 4 ns CFD output pulse width
 
−
|-
 
−
| 60/2728 = 1/45 (0.43) ||10.5 MeV : 100 ns FWHM,  0 mA , RF on, 20 Hz|| 5" Pb out, UNshielded illyusha scintilltor, 10 mV threshold on CFD, 4 ns CFD output pulse width
 
−
|-
 
−
| 57/20728 = 1/363 (0.8 Hz) ||10.5 MeV : 100 ns FWHM,  6.8 mA , RF on, 300 Hz|| 5" Pb out, UNshielded illyusha scintilltor, 10 mV threshold on CFD, 4 ns CFD output pulse width
 
−
|}<br>
 
  
 +
==Scintillator and Quartz cabling==
  
−
adding 5" of Pb between detector and accelerator decreased the rate from  to 1/60 beam pulses
+
Changed the scintillator detector known as "Jenni" so its HV is controlled remotely through connector SHV59A7 and its signal is on connector 223A7.
  
 +
Kelly is the scintillator on the accelerator side.
  
−
The cosmic + RF noise rate = 1/50 pulses
+
The quartz detector is on connector SHV59A8 and the signal on 223A8.
  
 +
=12/21/2012=
  
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=== Increased PMT Voltage by 100 and decrease beam current===
+
[[HRRL_Dec_21_2012Run]]
  
  
−
{| border="1" cellpadding="20" cellspacing="0"
+
{| border="1"
 +
| Run # || Configuration || ADC3 || ADC9
 +
|-
 +
|4648|| Transporting 3 MeV electrons, Trigger is OR with beam gate No TDC , T2 out|| [[File:r4648_ADC3.png | 200 px]]|| [[File:r4648_ADC9.png | 200 px]]
 +
|-
 +
|4651|| Transporting 3 MeV positrons, TDC working now , T2 out , or between NAI|| [[File:r4632_ADC3.png | 200 px]]|| [[File:r4632_ADC9.png | 200 px]]
 
|-
 
|-
−
| Rate (gamma/pulse)
+
|4652|| Transporting 3 MeV positrons, TDC working now , T2 IN, T1 in , or between NaIs, ADC3 was 100 Volts too high for the above runs|| [[File:r4632_ADC3.png | 200 px]]|| [[File:r4632_ADC9.png | 200 px]]
−
| Beam COnfig (E,pulse width,peak current)
 
−
|Configuration
 
 
|-
 
|-
−
| 160/25837 = 1/161  (1.9 Hz) ||10.5 MeV : 100 ns FWHM, 1.68 mA , RF on, 300 Hz|| 5" Pb out, UNshielded illyusha scintilltor, 10 mV threshold on CFD, 4 ns CFD output pulse width
+
|4653|| Transporting 3 MeV positrons, T2 IN, T1 in , or between NaIs, || [[File:r4632_ADC3.png | 200 px]]|| [[File:r4632_ADC9.png | 200 px]]
 
|-
 
|-
−
| 128/22979 = 1/180 (1.7 Hz) ||10.5 MeV : 100 ns FWHM, 0 mA , RF on, 300 Hz|| 5" Pb out, UNshielded illyusha scintilltor, 10 mV threshold on CFD, 4 ns CFD output pulse width
+
|4653|| Transporting 3 MeV positrons, T2 IN, T1 in , or between NaIs,Lowered NaI HV by 100 VOlts || [[File:r4632_ADC3.png | 200 px]]|| [[File:r4632_ADC9.png | 200 px]]
−
 
+
|}
−
|}<br>
 
  
−
==Electron/photon ratio==
+
NaI voltages
−
 
 
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Compare magnet in and out using a scintillator at the exit window of the 90 degree line.
 
−
 
 
−
 
 
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=12/12/12=
 
  
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Beam tuning
+
HV Left  = 1100 V
  
−
FC 90
+
Right = 1190 V
  
−
[[File:FC90_121212_A.png | 200 px]]
+
The ADC3 spectrum seemed to have a lot less photons, but then so did the ADC9 spectrum.

Latest revision as of 04:04, 22 September 2013

12/12/12

Worked on evaluating the background after the installation of 8" thick Pb wall in accelerator room and installing a FC, Scintillator, and Phosphorous screen at the end of the 90 degree line.

HRRL_Dec_12_2012Run

12/13/12

Worked on establishing a small spot size on the Phosphorous target and then documenting the beam properties.

HRRL_Dec_13_2012Run


12/14/12

Worked on establishing a small spot size on the Phosphorous target and then documenting the beam properties.

HRRL_Dec_14_2012Run

12/19/12

HRRL_Dec_19_2012Run

When Target T1 goes in and Accelerator side lights up( as viewed by scintillator Kelly) and Illyusha (when next to the beam exit window) also lights.

There is no Pb around T1.

Lets directionally shield Illyusha (when positioned next to the hallway) to determine how much lead to add around T1.


ADC3 = NaI Left ADC7 = NaI Right

TDC 29 = NaI right

TDC 31 = NaI left

Area Conditions
800 \pm 130 pVs No shielding T1 in
1600 \pm 200 pVs 1 Pb brick (2") shielding T1 in Add Pb and signal goes up? Just noise!
Move Illyusha so it is right next to experimental side flag, no shielding.

Take data using 3 MeV electrons on the T2 target.

The Scintillator known as Kelly is has an output of about 1 Volt.

Run # Configuration
4611 T1 and T2 are in, Veto discrimnator, ADC overflows , TDC31-TDC29 looks OK, 25 Hz counting rate
4612 T1 and T2 are in, Veto discrimnator, cut the beam current in half, rate is 0.06 Hz
4613 T1 and T2 are in, Veto discrimnator, cut the beam current in half, rate is 4 Hz, lowered threshold from 20 to 7 mV
4614 T1 in T2 out, Veto discrimnator, cut the beam current in half, rate is 0.03 Hz

Take data using 3 MeV Positrons on the T2 target.

The Scintillator known as Kelly is has an output of about 1 Volt.

ADC9 = NaI right

Run # Configuration
4621 T1 and T2 are in, Veto discrimnator, threshold is 5 mV, Kelly at 3.5 Volt ,rate is 0.2 Hz

12/20/2012

HRRL_Dec_20_2012Run

RF noise measurement

Run # Configuration ADC3 ADC9
4625 Na-22 Source run with RF no beam current R4625 ADC3.png R4625 ADC9.png
run# Mode and Energy T1 T2 Sweep Magnet D1 and D2 (Amp) logic HV NaI Left (CH3) (Det#1) HV NaI R Right (CH9) (Det#2) Dis Threshold Left Dis Threshold Right Reprate start stop Run time (s) Int Rate comments event pulses
4623 3 MeV e+ on T2 in in out 5.8, 5.8 (NaIL & GunTrig) & (NaIR & GunTrig) 1100V 1190V 5 mV 5 mV 300 16:43:26 16:: events/s beam pulses
Run # Source logic Run starts Run ends HV NaI Left (CH3) (Det#1) HV NaI R Right (CH9) (Det#2) Spectrum
4624 Na22 NaI Right && NaI Left 19:42:36 08:03:30 next day 1100 V 1190 V

RF adds 50 channels of noise to NaI signal and moves Source peak forward.

RF was for 3 MeV electrons, perhaps RF for higher energy electrons will add the remaining 30 channels of noise on the NaI detectors.

NaINoise 232425.png

Positron attempt

Run # Configuration ADC3 ADC9
4632 Transporting 3 MeV positrons, Looks like beam right (ADC9) has 511s beam left (ADC3) swamped with photons 200 px 200 px

Need to shield beam left more.


Scintillator and Quartz cabling

Changed the scintillator detector known as "Jenni" so its HV is controlled remotely through connector SHV59A7 and its signal is on connector 223A7.

Kelly is the scintillator on the accelerator side.

The quartz detector is on connector SHV59A8 and the signal on 223A8.

12/21/2012

HRRL_Dec_21_2012Run


Run # Configuration ADC3 ADC9
4648 Transporting 3 MeV electrons, Trigger is OR with beam gate No TDC , T2 out 200 px 200 px
4651 Transporting 3 MeV positrons, TDC working now , T2 out , or between NAI 200 px 200 px
4652 Transporting 3 MeV positrons, TDC working now , T2 IN, T1 in , or between NaIs, ADC3 was 100 Volts too high for the above runs 200 px 200 px
4653 Transporting 3 MeV positrons, T2 IN, T1 in , or between NaIs, 200 px 200 px
4653 Transporting 3 MeV positrons, T2 IN, T1 in , or between NaIs,Lowered NaI HV by 100 VOlts 200 px 200 px

NaI voltages

HV Left = 1100 V

Right = 1190 V

The ADC3 spectrum seemed to have a lot less photons, but then so did the ADC9 spectrum.

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