Difference between revisions of "HRRL 4-13-09"

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It looks like the rate is not changing much in region of the DC Sense HV ~1250-1500 Volts. Below 1200 Volts of DC Sense i was not getting any events. So i decided to stop At 1200 Volts and not go below that.
 
It looks like the rate is not changing much in region of the DC Sense HV ~1250-1500 Volts. Below 1200 Volts of DC Sense i was not getting any events. So i decided to stop At 1200 Volts and not go below that.
  
−
<math>Rate % = ({[\frac{DCSenseWire4 + FSC + RF}{RF}]}_{BrickOut} - {[\frac{DCSenseWire4 + FSC + RF}{RF}]}_{BrickIn}) \times 100 %</math>
+
<math>Rate % \equiv \left ( \left [\frac{\mbox{Counts(DCSenseWire4 + Front Scint + RF)}}{\mbox{RF Pulses}} \right ]_{\mbox{BrickOut}} - \left [\frac{\mbox{Counts(DCSenseWire4 + Front Scint + RF)}}{\mbox{RF pulses}}\right ]_{\mbox{BrickIn}}\right ) \times 100 %</math>
 +
 
 +
 
  
 
;Data Table
 
;Data Table
  
 
{| border="3"  cellpadding="20" cellspacing="0"
 
{| border="3"  cellpadding="20" cellspacing="0"
−
|DC Sense HV (Volts)|| Rate % (BrickOut-BrickIn) || Stand. Dev.
+
|DC Sense HV (Volts)|| Rate % (BrickOut-BrickIn) || Rate % (Brick Out) || Rate % (Brick In)
 
|-
 
|-
−
| 1200 || 0.11 || 0.008
+
| 1200 || 0.11 <math>\pm</math> 0.008 || 0.2 <math>\pm</math> 0.09 || 0.09 <math>\pm</math> 0.1
 
|-
 
|-
−
| 1300 || 2.07 || 0.18
+
| 1300 || 2.07 <math>\pm</math> 0.18 || 2.29 <math>\pm</math> 0.29 || 0.21 <math>\pm</math> 0.12
 
|-
 
|-
−
| 1400 || 9.25 || 1.35
+
| 1400 || 9.25 <math>\pm</math> 1.35 || 10.73 <math>\pm</math> 1.97 || 0.3 <math>\pm</math> 0.08
 
|-
 
|-
−
| 1500 || 11.3  || 3.4
+
| 1500 || 11.3  <math>\pm</math> 3.4 || 12.6 <math>\pm</math> 4.4 || 1.3 <math>\pm</math> 1
 
|-
 
|-
−
| 1550 || 32.57 || 0.46
+
| 1550 || 32.57 <math>\pm</math> 0.46 || 37.17 <math>\pm</math> 0.62 || 4.6 <math>\pm</math> 0.16
 
|}
 
|}
  
Line 133: Line 135:
  
  
 +
[[Image:PlateauCurveDCMetalica_LogarithmicScale_4-16-09_HRRL_BrickInOutBrickIn-Out.jpg|450px]]
  
  
 
;Plateau Curve  [[Image:Forest_IoniztionChamberOperatingRegions.jpg|300px]]
 
;Plateau Curve  [[Image:Forest_IoniztionChamberOperatingRegions.jpg|300px]]
  
 +
ODU Efficiency curve.  HV = Sense - Field
 +
 +
[[Image:ODU_R1eff-vs-HV.png|300 px]]
 +
 +
Our baby chamber measurements suggests a plateau near a sense wire HV of 1400 Volts and ODU saw a plateau near a Sense-Field high voltage of 2250 => Sense HV around 1400 volts like ours.
  
 
==DC + FSC1 Coinc==
 
==DC + FSC1 Coinc==
Line 291: Line 299:
 
| In||  34700 ||  120 || 0.3 %
 
| In||  34700 ||  120 || 0.3 %
 
|-
 
|-
−
| Out|| 9835  || 1278  || %
+
| Out|| 9835  || 1278  || 13 %
−
|-
 
−
| In|| 44456 ||  102 ||  %
 
 
|-
 
|-
−
| Out|| 47695  ||  2410 || %
+
| In|| 44456 ||  102 || 0.2%
 
|}
 
|}
  
Line 375: Line 381:
 
(from Center) 2" r952 16:06:20 16:06:54
 
(from Center) 2" r952 16:06:20 16:06:54
  
−
4" r953 16:07:54 16:08:08
+
6" r954 16:09:01 16:09:16
  
−
6" r954 16:09:01 16:09:16
+
[[Image:HRRL_DCPosition_Measurements_4-16-09_UsingADC_ShutterOut.jpg|550px]]
  
  
−
The histograms below are weighted by time, y axis reprezent number of counts per second.
+
The histograms below are weighted by time and background is eliminated, y axis represent number of counts per second.
  
−
[[Image:Position_Measurements_For_DCMetallica_SenseWire1450Volts.gif|550px]]
+
{| border="3"  cellpadding="20" cellspacing="0"
 +
| Distance from the Endplate of DCSenseWire4 (inches) || Run Number || Number of Events/sec  (BrickOut, Integral)|| ADC Histogram (>100 channels)
 +
|-
 +
| 0" || r949 || 219 <math>\pm</math> 0.067 ||  [[Image:Position_Measurements_For_DCMetallica_SenseWire4_1450Volts_949.gif|150px]]
 +
|-
 +
| 1.5" || r954 || 257 <math>\pm</math> 0.062 || [[Image:Position_Measurements_For_DCMetallica_SenseWire4_1450Volts_954.gif|150px]]
 +
|-
 +
| 5.5" || r952 || 388 <math>\pm</math> 0.05 || [[Image:Position_Measurements_For_DCMetallica_SenseWire4_1450Volts_952.gif|150px]]
 +
|-
 +
| 7.5 " || r951 || 221 <math>\pm</math> 0.067 || [[Image:Position_Measurements_For_DCMetallica_SenseWire4_1450Volts_951.gif|150px]]
 +
|-
 +
| background || r950 || 0.36 <math>\pm</math> 1.7 || [[Image:Position_Measurements_For_DCMetallica_SenseWire4_1450Volts_950.gif|150px]]
 +
|}
  
 
=4/17/09=
 
=4/17/09=
Line 409: Line 427:
 
==Trigger setup==
 
==Trigger setup==
  
−
[[Image:Trigger_3Scint_RFgate.png|200px]]
 
  
−
[[Image:Trigger_3Scint_RFgate_DC.png|200px]]
+
As a trigger 3 Scintillators with RF Gate were used. Drift Chamber was sandwiched between the 1cm^2 Small fron PMT and Blue Second scintillator. At the end we had also blue scintillator. Two Blue scintillators were forming cross.
 +
 
 +
[[Image:ExperimentalSetup_4-20-09.gif|500px]]  
  
 +
[[Image:Trigger_3Scint_RFgate.png|200px]][[Image:Trigger_3Scint_RFgate_DC.png|200px]]
  
 
== Run Range==
 
== Run Range==
Line 433: Line 453:
  
 
==Plateau Measurements==
 
==Plateau Measurements==
 +
[[Image:HRRL_16-04-09_DCSenseHV_vs_RateShutterInandOut_ADCMeasurements.jpg|450px]][[Image:HRRL_16-04-09_DCSenseHV_vs_RateShutterInandOut_ADCMeasurements_1.jpg|450px]]
 +
  
 
{| border="3"  cellpadding="20" cellspacing="0"
 
{| border="3"  cellpadding="20" cellspacing="0"
Line 492: Line 514:
 
== Position measurements==
 
== Position measurements==
  
−
===Scaler Measurements===  
+
===Scaler and ADC Measurements===  
  
  
−
;Data Summery Table
+
On y axis of ADC Histograms i have number of events per second.
  
 
{| border="3"  cellpadding="20" cellspacing="0"
 
{| border="3"  cellpadding="20" cellspacing="0"
−
| Distance from the Endplate of DCSenseWire4 (inches) || Rate % || Error %
+
| Run #|| Brick In/Out|| rep rate (Hz)|| current (ma) || Distance from the Endplate of DCSenseWire4 (inches) || Number RF gates (SCAL13)|| Number Coincidences (SCAL08)|| DC coinc with 3PMT + RF gate (SCAL02)|| Rate SCAL02/SCAL13 (%) || DC_ADC Histograms(ADC15 && ADC8(FC)>1000) || DC_ADC Histograms(ADC15>80 && FC>1000)  || Rate% (ADC15>80&&FC>1000) || Rate % (ADC15>80&&FC>1000/ADC15&&ADC8(FC)>1000)
 +
|-
 +
| 1028 || Out || 900 || 65 || 1" || 3561 || 1462 || 819 || 22 || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1028.gif|100px]] || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1028_1.gif|100px]] ||
 +
|-
 +
| 1029 || Out || 900 || 65 || 2" || 9988 || 4012 || 2480 || 25|| [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1029.gif|100px]] || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1029_1.gif|100px]] ||
 +
|-
 +
| 1030 || Out || 900 || 65 || 3" || 4738 || 1943 || 1217 || 25 || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1030.gif|100px]] || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1030_1.gif|100px]] ||
 +
|-
 +
| 1031 || Out || 900 || 65 || 4" || 4683 || 1891 || 1214 || 26|| [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1031.gif|100px]] || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1031_1.gif|100px]] ||
 +
|-
 +
| 1032 || Out || 900 || 65 || 6" || 2440 || 1001 || 619 || 26|| [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1032.gif|100px]] || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1032_1.gif|100px]] ||
 +
|-
 +
| 1033 || Out || 900 || 65 || 7.5" || 3420 || 1414 || 965 || 28|| [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1033.gif|100px]] || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1033_1.gif|100px]] ||
 
|-
 
|-
−
| 1" || 12 || 0.53
+
| 1041 || Out || 900 || 65 || -2" || 4570 || 1843 || 41 || 0.9|| [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1041.gif|100px]] || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1041_1.gif|100px]] ||
 +
|-
 +
| 1039 || In || 900 || 65 || 1" || 4074 || 1342 || 388 || 10 || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1039.gif|100px]] || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1039_1.gif|100px]] ||
 
|-
 
|-
−
| 2" || 12 || 0.52
+
| 1038 || In || 900 || 65 || 2" || 5242 || 1681 || 554 || 10 || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1038.gif|100px]] || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1038_1.gif|100px]] ||
 
|-
 
|-
−
| 3" || 15 || 0.5
+
| 1037 || In || 900 || 65 || 3" || 2366 || 755 || 261 || 11 || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1037.gif|100px]] || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1037_1.gif|100px]] ||
 
|-
 
|-
−
| 4" || 14 || 0.48
+
| 1036 || In || 900 || 65 || 4" || 2437 || 821 || 287 || 12 || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1036.gif|100px]] || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1036_1.gif|100px]] ||
 
|-
 
|-
−
| 6" || 15 || 0.5
+
| 1035 || In || 900 || 65 || 6" || 2926 || 904 || 320 || 11 || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1035.gif|100px]] || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1035_1.gif|100px]] ||
 
|-
 
|-
−
| 7.5 " || 18 || 0.51
+
| 1034 || In || 900 || 65 || 7.5" || 3948 || 1247 || 408 || 10 || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1034.gif|100px]] || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1034_1.gif|100px]] ||
−
|}
+
|-
 +
| 1040 || In || 900 || 65 || -2" || 5516 || 1780 || 18 || 0.3  || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1040.gif|100px]] || [[Image:HRRL_16-04-09_DCS4_1450Volts_PosMeas_1040_1.gif|100px]] ||
 +
|}  
  
−
 
+
====Scaler Results====
−
 
 
  
  
 +
<math>Rate = \frac{Coinc(DC+PMT+RFGate)}{RF Gate} \times 100 %</math>
  
 +
;Data Summery Table
  
 
{| border="3"  cellpadding="20" cellspacing="0"
 
{| border="3"  cellpadding="20" cellspacing="0"
−
| Run #|| Brick In/Out|| rep rate (Hz)|| current (ma) || Distance from the Endplate of DCSenseWire4 (inches) || Number RF gates (SCAL13)|| Number Coincidences (SCAL08)|| DC coinc with 3PMT + RF gate (SCAL02)|| Rate SCAL02/SCAL13 (%)
+
| Distance from the Endplate of DCSenseWire4 (inches) || Rate % (BrickOut-BrickIn) || Rate % (Brick In) || Rate % (Brick  Out)
 +
|-
 +
| 1" || 12 <math>\pm</math> 0.53 || 10 <math>\pm</math>0.3 || 22 <math>\pm</math> 0.2
 
|-
 
|-
−
| 1028 || Out || 900 || 65 || 1" || 3561 || 1462 || 819 || 22
+
| 2" || 12 <math>\pm</math> 0.52 || 10 <math>\pm</math> 0.3  || 25 <math>\pm</math> 0.2
 
|-
 
|-
−
| 1029 || Out || 900 || 65 || 2" || 9988 || 4012 || 2480 || 25
+
| 3" || 15 <math>\pm</math> 0.5 || 11 <math>\pm</math> 0.3  || 25 <math>\pm</math> 0.2
 
|-
 
|-
−
| 1030 || Out || 900 || 65 || 3" || 4738 || 1943 || 1217 || 25
+
| 4" || 14 <math>\pm</math> 0.48 || 12 <math>\pm</math> 0.3 || 26 <math>\pm</math> 0.19
 
|-
 
|-
−
| 1031 || Out || 900 || 65 || 4" || 4683 || 1891 || 1214 || 26
+
| 6" || 15 <math>\pm</math> 0.5 || 11 <math>\pm</math> 0.3  || 26 <math>\pm</math> 0.19
 
|-
 
|-
−
| 1032 || Out || 900 || 65 || 6" || 2440 || 1001 || 619 || 26
+
| 7.5 " || 18 <math>\pm</math> 0.51 || 10 <math>\pm</math> 0.3  || 28 <math>\pm</math> 0.19
 
|-
 
|-
−
| 1033 || Out || 900 || 65 || 7.5" || 3420 || 1414 || 965 || 28
+
| -2 || 0.6 <math>\pm</math> 2.88 || 0.9 <math>\pm</math> 1 || 0.3 <math>\pm</math> 1.8
 +
|}
 +
 
 +
[[Image:DCMetalica_Position_vs_Rate_1450Volts_4-20-09.jpg|450px]][[Image:DCMetalica_Position_vs_Rate_1450Volts_4-20-09_ShutterIn_Out_out-In.jpg|450px]]
 +
 
 +
====ADC Results====
 +
 
 +
;Example Calculating the mean value of Rate
 +
I chose r1028.root file. The run was broken into three runs. For each run Faraday Cup was made(FC>1000).
 +
 
 +
[[Image:FC_HRRL_16-04-09_r1028.gif|450px]][[Image:FC_HRRL_16-04-09_r1028_after_cut.gif|450px]]
 +
 
 +
Run divided into three separate files:
 +
 
 +
 
 +
[[Image:ADC_HRRL_16-04-09_r1028_1.gif|350px]][[Image:ADC_HRRL_16-04-09_r1028_2.gif|350px]][[Image:ADC_HRRL_16-04-09_r1028_3.gif|350px]]
 +
 
 +
<math>Rate % = \frac{ADC Counts (FC>1000 ADC>80)}{ADC Counts(FC>1000)} \times 100 %</math>
 +
 
 +
THe mean value and error for each file was done using the weighted error propagation [http://www.physics.umd.edu/courses/Phys261/F06/ErrorPropagation.pdf].
 +
 
 +
 
 +
 
 +
 
 +
;Data Summery Table
 +
 
 +
 
 +
{| border="3"  cellpadding="20" cellspacing="0"
 +
| Distance from the Endplate of DCSenseWire4 (inches) || Rate % (BrickOut-BrickIn) || Rate % (Brick Out) || Rate % (Brick  In)
 
|-
 
|-
−
| 1041 || Out || 900 || 65 || DC is removed from the beam || 4570 || 1843 || 41 || 0.9
+
| 1" || 17 <math>\pm</math> 0.87 || 28 <math>\pm</math>0.4 || 11 <math>\pm</math> 0.47
−
|-
 
−
| 1039 || In || 900 || 65 || 1" || 4074 || 1342 || 388 || 10
 
 
|-
 
|-
−
| 1039 || In || 900 || 65 || 2" || 5242 || 1681 || 554 || 10
+
| 2" || 21 <math>\pm</math> 1.23 || 35 <math>\pm</math> 0.48  || 14 <math>\pm</math> 0.75
 
|-
 
|-
−
| 1039 || In || 900 || 65 || 3" || 2366 || 755 || 261 || 11
+
| 3" || 20 <math>\pm</math> 1.34 || 36 <math>\pm</math> 0.44  || 16 <math>\pm</math> 0.9
 
|-
 
|-
−
| 1039 || In || 900 || 65 || 4" || 2437 || 821 || 287 || 12
+
| 4" || 21 <math>\pm</math> 1.4 || 38 <math>\pm</math> 0.6  || 17 <math>\pm</math> 0.8
 
|-
 
|-
−
| 1039 || In || 900 || 65 || 6" || 2926 || 904 || 320 || 11
+
| 6" || 22 <math>\pm</math> 1.297 || 39 <math>\pm</math> 0.557  || 17 <math>\pm</math> 0.74
 
|-
 
|-
−
| 1039 || In || 900 || 65 || 7.5" || 3948 || 1247 || 408 || 10
+
| 7.5 " || 22 <math>\pm</math> 1.32 || 39 <math>\pm</math> 0.48  || 17 <math>\pm</math> 0.84
 
|-
 
|-
−
| 1040 || In || 900 || 65 || DC is removed from the beam || 5516 || 1780 || 18 || 0.3
+
| -2 || 0.3 <math>\pm</math> 0.97 || 2.7 <math>\pm</math> 0.4 || 2.4 <math>\pm</math> 0.57
−
|}
+
|}
 +
 
 +
[[Image:HRRL_16-04-09_Position_vs_Rate_ADCMeasuremts_AllData_UsingSimpleErrorCalculation.jpg|650px]]
 +
 
 +
;Example Calculating Weighted Error
 +
 
 +
<math>\sigma _{\bar{X}} = \sqrt{\frac{1}{\Sigma _i \sigma_i^{-2}}} = \sqrt{\frac{1}{(\frac{1}{\sqrt{17642}})^{-2} + (\frac{1}{\sqrt{17679}})^{-2} + (\frac{1}{\sqrt{17631}})^{-2}}} = 0.4 %</math>
 +
 
 +
 
 +
Puts cuts on ADC data until rate is the same as with scaler data then overlay position measurements plots
 +
 
 +
====DC efficiency====
 +
 
 +
Plot histogram for all runs to check if pedestal is in same location.
 +
 
 +
Some ADC runs had  3 scintillators in coincidence.  Use this to check DC efficiency.  plot as function of HV the ratio of DC hits to coincidences.  use the ADC value for the wire output to do several different signal thresholds.
 +
 
 +
 
  
  
 
[http://wiki.iac.isu.edu/index.php/Qweak Go Back] [[Qweak]]
 
[http://wiki.iac.isu.edu/index.php/Qweak Go Back] [[Qweak]]

Latest revision as of 22:19, 10 June 2009

Default HRRL running Conditions

[math]I_{peak}[/math] Pulse Width Rep Rate Energy
8 mA 25 ns 1 Hz 3 MeV


run plan

Date Task
4/11/09 Vaho stil running til 7 pm, configure Motion Sliders
4/12/09 Build shutter and unstack beam line
4/13/09 Install Aluminum brick shutter and interlock with HRRL, test beam transport: Run HRRL accelerator from 3pm til 5 pm (25 ns pulse width, 3 MeV electrons, 1 Hz rep rate, 8 mA peak)
4/14/09 Repair Freon leak in Chiller, HRRL down, Install DAQ
4/15/09 Run HRRL from 3 pm til 5 pm (25 ns pulse width, 3 MeV electrons, 1 Hz rep rate, 8 mA peak), Do Plateau measurements and test readout
4/16/09 Run HRRL from 9 am til 5 pm (25 ns pulse width, 3 MeV electrons, 1 Hz rep rate, 8 mA peak), Do Plateau measurements and test readout
4/17/09 Run HRRL from 2 pm til 5 pm, position studies using Drift chamber and GEM
4/20/09 Run HRRL from 9 am til 5 pm finish detector tracking studies

4/13/09

Electron Dose tests

Shutter In

0.1 mrad/hr outside HRRL experimental door.

2.7 mrad/hr in the end of HRRL experimental hallway.

Shutter Out

0.1 mrad/hr in Dr. Forest office.

Sintillator tests

RS1 = 2 aluminum blocks are in front of Long BLue Scintillator plugged into the cable patch panel 223A2

FS2 = Small scintillator is in 223A1

FS1 = Front Long Blue Scintillator plugged into the 223A4 and High Voltage - A3 channel.


HV SC1 HV RS1 Desc.
840 840

GEM noise

100 ns RF pulse width

GEM in Accelerator room

Bag Rep Rate Beam Current Peak to peak noise
Off No ground strap 990 Hz 3 V =60 mA [math]29 \pm 2[/math] mV on 1 mus scale ScopePic 4-13-09 3.png
Off + ground strap 990 Hz 3 V =60 mA [math] 72\pm 1[/math] mV on 1 mus scale ScopePic 4-13-09 4.png
on No Ground strap 990 Hz 4 V =80 mA [math] 42 \pm 2[/math] mV on 1 mus scale ScopePic 4-13-09 2.png
on + Ground strap 990 Hz 3 V =60 mA [math]66 \pm 2[/math] mV on 1 mus scale ScopePic 4-13-09 1.png
on + Ground strap + insulation 990 Hz 3 V =60 mA [math] 52\pm 30[/math] mV on 1 mus scale ScopePic 4-13-09 5.png

The insulation was placed between the mylar bag and the BNC conenctor on the HV board. The inside of the mylar bag is conducting. There is a film covering the outside of the mylar bag which prevents conduction test with voltmeter.

GEM in HRRL exp cell

Bag Rep Rate Current Peak to peak noise
Off No ground strap 990 Hz 3 V =60 mA [math] 46\pm [/math]1 mV on 1 mus scale ScopePic 4-13-09 3 HRRL exp cell.png
on + Ground strap + insulation 990 Hz 3 V =60 mA [math] 52 \pm 16[/math] mV on 1 [math]\mu[/math]s scale ScopePic 4-13-09 5 HRRL exp cell.png

The insulation was placed between the mylar bag and the BNC conenctor on the HV board. The inside of the mylar bag is conducting. There is a film covering the outside of the mylar bag which prevents conduction test with voltmeter.


FSC1ScopePic 4-13-09 1 HRRL exp cell.png FSC1ScopePic 4-13-09 2 HRRL exp cell.png

4/16/09

The Plateau Measurements were done using Aluminum Brick. A 2X4X8 Aluminum brick shutter stopped 3 MeV electrons from entering the HRRL experimental cell. The rates seen by the DC and front scintillator were compared when the brick was in vs out. Plateau Curve shown below is based on the data which is represented in this section for each DC Sense High Voltage. The DC Sense HV range was chosen from 1200 Volts to 1550 Volts. For each voltage the data was taken two or three times. It looks like the rate is not changing much in region of the DC Sense HV ~1250-1500 Volts. Below 1200 Volts of DC Sense i was not getting any events. So i decided to stop At 1200 Volts and not go below that.

[math]Rate % \equiv \left ( \left [\frac{\mbox{Counts(DCSenseWire4 + Front Scint + RF)}}{\mbox{RF Pulses}} \right ]_{\mbox{BrickOut}} - \left [\frac{\mbox{Counts(DCSenseWire4 + Front Scint + RF)}}{\mbox{RF pulses}}\right ]_{\mbox{BrickIn}}\right ) \times 100 %[/math]


Data Table
DC Sense HV (Volts) Rate % (BrickOut-BrickIn) Rate % (Brick Out) Rate % (Brick In)
1200 0.11 [math]\pm[/math] 0.008 0.2 [math]\pm[/math] 0.09 0.09 [math]\pm[/math] 0.1
1300 2.07 [math]\pm[/math] 0.18 2.29 [math]\pm[/math] 0.29 0.21 [math]\pm[/math] 0.12
1400 9.25 [math]\pm[/math] 1.35 10.73 [math]\pm[/math] 1.97 0.3 [math]\pm[/math] 0.08
1500 11.3 [math]\pm[/math] 3.4 12.6 [math]\pm[/math] 4.4 1.3 [math]\pm[/math] 1
1550 32.57 [math]\pm[/math] 0.46 37.17 [math]\pm[/math] 0.62 4.6 [math]\pm[/math] 0.16


Our Plateau Curve

PlateauCurveDCMetalica LinearScale 4-16-09 HRRL.jpgPlateauCurveDCMetalica LogarithmicScale 4-16-09 HRRL.jpg


PlateauCurveDCMetalica LogarithmicScale 4-16-09 HRRL BrickInOutBrickIn-Out.jpg


Plateau Curve Forest IoniztionChamberOperatingRegions.jpg

ODU Efficiency curve. HV = Sense - Field

ODU R1eff-vs-HV.png

Our baby chamber measurements suggests a plateau near a sense wire HV of 1400 Volts and ODU saw a plateau near a Sense-Field high voltage of 2250 => Sense HV around 1400 volts like ours.

DC + FSC1 Coinc

Accelerator Rep rate is 100 Hz
Brick Gun Pulses DC pulses DC/Gun pulses
Out 16990 1568 9.2 %
In 54801 310 0.6%
Out 10242 841 8.2%
In 17945 93 0.5 %
Out 20871 1791 8.6%
In 15101 71 0.47 %
Out 6549 531 8.1%

It looks like we have electrons firing the DC 10% of the time and photons less than 1% of the time.


HV Settings S:F:G=1800:-900:1260

Accelerator Rep rate is 900 Hz
Brick Gun Pulses DC pulses DC/Gun pulses
Out 1820 285 15.6 %
In 6048 161 2.7 %
Out 1420 219 15.4%
In 3230 110 3.4 %

HV Settings S:F:G=1750:-875:1225

Accelerator Rep rate is 900 Hz
Brick Gun Pulses DC pulses DC/Gun pulses
Out 2022 213 10.5%
In 37277 308 0.8 %
Out 1502 178 %
In 12152 112 %
Out 2325 287 %
In 35474 368 %

HV Settings S:F:G=1700:-850:1190

Accelerator Rep rate is 900 Hz
Brick Gun Pulses DC pulses DC/Gun pulses
Out 2358 428 18 %
In 6576 123 1.9 %
Out 3115 531 17 %
In 86819 1278 1.5 %

HV Settings S:F:G=1650:-825:1155

Accelerator Rep rate is 900 Hz
Brick Gun Pulses DC pulses DC/Gun pulses
Out 2690 679 25 %
In 3560 119 3.3 %

HV Settings S:F:G=1600:-800:1120

Accelerator Rep rate is 900 Hz
Brick Gun Pulses DC pulses DC/Gun pulses
Out 3428 1010 29 %
In 3904 120 3%

HV Settings S:F:G=1550:-775:1085

Accelerator Rep rate is 900 Hz
Brick Gun Pulses DC pulses DC/Gun pulses
Out 2690 982 36.5 %
In 2352 105 4.4 %
Out 645 240 37%
In 61988 2878 4.6 %
Out 2391 927 38%
In 2872 139 4.8%

HV Settings S:F:G=1500:-750:1050

Accelerator Rep rate is 900 Hz
Brick Gun Pulses DC pulses DC/Gun pulses
Out 8021 1442 17 %
In 37506 884 2.3 %
Out 5428 1431 8.2%
In 4496 116 0.3 %

HV Settings S:F:G=1400:-700:980

Accelerator Rep rate is 900 Hz
Brick Gun Pulses DC pulses DC/Gun pulses
Out 50815 5703 11 %
In 41621 178 0.4 %
Out 70392 8274 8.2%
In 34700 120 0.3 %
Out 9835 1278 13 %
In 44456 102 0.2%

HV Settings S:F:G=1300:-650:910

Accelerator Rep rate is 900 Hz
Brick Gun Pulses DC pulses DC/Gun pulses
Out 38108 1016 2.66 %
In 48996 190 0.38 %
Out 23693 532 2.24%
In 71868 103 0.14 %
Out 86296 1693 1.96%
In 124099 147 0.118 %

HV Settings S:F:G=1200:-600:840

Accelerator Rep rate is 900 Hz
Brick Gun Pulses DC pulses DC/Gun pulses
Out 63976 141 0.2 %
In 108886 97 0.09 %



ADC Measurements

1300 r936 14:41:51 14:49:18 BreakOut

1400 r937 14:50:40 14:51:14 BreakOut

1500 r938 14:54:30 14:55:44 BOut

1600 r939 14:57:10 14:58:47 Bout

1700 r940 15:00:39 15:04:47 bO

1800 r942 15:12:26 15:15:46 bo


1350 r946 15:25:24 15:26:39

1450 r948 15:31:29 15:32:05

1550 r943 15:17:40 15:19:19

1650 r944 15:20:08 15:21:00

1750 r945 15:21:40 15:22:49

Position Measurement

break Out

HV 1450 Sense Wire

on edge of the drift chamber r949 15:48:06 15:48:50

Drift Chamber is removed from the beam r950 15:51:39 15:55:41

Beam is at the center of DC r951 15:59:45 16:00:12

(from Center) 2" r952 16:06:20 16:06:54

6" r954 16:09:01 16:09:16

HRRL DCPosition Measurements 4-16-09 UsingADC ShutterOut.jpg


The histograms below are weighted by time and background is eliminated, y axis represent number of counts per second.

Distance from the Endplate of DCSenseWire4 (inches) Run Number Number of Events/sec (BrickOut, Integral) ADC Histogram (>100 channels)
0" r949 219 [math]\pm[/math] 0.067 Position Measurements For DCMetallica SenseWire4 1450Volts 949.gif
1.5" r954 257 [math]\pm[/math] 0.062 Position Measurements For DCMetallica SenseWire4 1450Volts 954.gif
5.5" r952 388 [math]\pm[/math] 0.05 Position Measurements For DCMetallica SenseWire4 1450Volts 952.gif
7.5 " r951 221 [math]\pm[/math] 0.067 Position Measurements For DCMetallica SenseWire4 1450Volts 951.gif
background r950 0.36 [math]\pm[/math] 1.7 Position Measurements For DCMetallica SenseWire4 1450Volts 950.gif

4/17/09

Started at 2:25 pm 

 where are the log book entries for today?

Screen

100 mA no electrons on the screen, the highest current.

At 1850 Volts on sense DC starts sparking on lowest Beam current.

Installing Collimator Current into ADC

Adjusting HRRL Beam Current to Drift Chamber HV

Determine Trigger

Scaler Measurements

4/20/09

Trigger setup

As a trigger 3 Scintillators with RF Gate were used. Drift Chamber was sandwiched between the 1cm^2 Small fron PMT and Blue Second scintillator. At the end we had also blue scintillator. Two Blue scintillators were forming cross.

500px

Trigger 3Scint RFgate.pngTrigger 3Scint RFgate DC.png

Run Range

Determine range of operating conditions for DC HV, rep rate and beam current


Run # Brick In/Out rep rate (Hz) current (ma) Number RF gates (SCAL13) Number Coincidences (SCAL08) DC singles FC spectrum DC spectrum comments
999 Out 65 40 R999 FC.gif
1000 Out 900 40 R1000 FC.gif 100px


Looks like we should run at 40 mA peak current and change the DC HV from 1200 to 1600 Volts on the sense wire


Plateau Measurements

HRRL 16-04-09 DCSenseHV vs RateShutterInandOut ADCMeasurements.jpgHRRL 16-04-09 DCSenseHV vs RateShutterInandOut ADCMeasurements 1.jpg


Run # Brick In/Out rep rate (Hz) current (ma) DC HV (S:F:G) Number RF gates (SCAL13) Number Coincidences (SCAL08) DC coinc with 3PMT + RF gate (SCAL02) Rate SCAL02/SCAL13 (%) FC spectrum DC spectrum DC spectrum(CUT on ADC>80, log scale) Events/sec comments
1003 Out 65 40 1600:: 109632 217476 28709 26.2 R999 FC.gif 100px 100px Overflows in DC ADC spectrum
1006 Out 900 40 1600 115719 212130 37534 32.4 R1006 FC.gif R1006 ADC.gif R1006 ADC log.gif
1007 Out 900 40 1550 5781 2427 1751 30.3 R1007 FC.gif R1007 ADC.gif 100px
1008 Out 900 40 1550 5803 2399 1832 32 R1008 FC.gif R1008 ADC.gif R1008 ADC log.gif 2dB attenuation added
1009 Out 900 40 1500 5650 2376 1705 30.2 R1009 FC.gif R1009 ADC.gif 100px
1010 Out 900 40 1500 R1010 FC.gif R1010 ADC.gif 100px
1012 Out 900 40 1500 4589 1842 1385 30.2 R1012 FC.gif R1012 ADC.gif R1012 ADC log.gif 5dB attenuation added
1014 Out 900 40 1450 6285 2609 1875 30 R1014 FC.gif R1014 ADC.gif R1014 ADC log.gif
1015 Out 900 40 1400 6089 2501 1743 28.6 R1015 FC.gif R1015 ADC.gif R1015 ADC log.gif
1016 Out 900 40 1350 9398 3799 998 10.6 R1016 FC.gif R1016 ADC.gif R1016 ADC log.gif
1017 Out 900 40 1300 6567 2681 1167 17.7 R1017 FC.gif R1017 ADC.gif R1017 ADC log.gif
1018 Out 900 40 1250 5440 2278 694 12.7 R1018 FC.gif R1018 ADC.gif R1018 ADC log.gif
1019 Out 900 40 1200 4123 1738 619 15 R1019 FC.gif R1019 ADC.gif R1019 ADC log.gif
1020 out 900 40 1150 4402 1798 790 17 R1020 FC.gif R1020 ADC.gif R1020 ADC log.gif
1021 out 900 40 1425 5521 2280 1812 32 R1021 FC.gif R1021 ADC.gif R1021 ADC log.gif
1022 in 900 40 1425 4681 1531 825 17.6 R1022 FC.gif R1022 ADC.gif R1022 ADC log.gif
1023 in 900 40 1600 3748 1155 739 19 R1023 FC.gif R1023 ADC.gif 100px
1024 in 900 40 1550 6156 1899 1172 19 R1024 FC.gif R1024 ADC.gif 100px
1025 in 900 40 1500 6280 1920 1230 19 R1025 FC.gif R1025 ADC.gif 100px
1026 in 900 40 1450 3631 1142 799 22 R1026 FC.gif R1026 ADC.gif 100px
1042 in 900 40 1300 3616 1167 424 11.7 R1042 FC.gif R1042 ADC.gif R1042 ADC log.gif
1043 in 900 40 1350 3453 1094 441 13 R1043 FC.gif R1043 ADC.gif R1043 ADC log.gif
1044 in 900 40 1250 3719 1262 598 16 R1044 FC.gif R1044 ADC.gif R1044 ADC log.gif
1045 in 900 40 1200 3270 1004 342 10 R1045 FC.gif R1045 ADC.gif R1045 ADC log.gif
1046 in 900 40 1150 2731 911 282 10 R1046 FC.gif R1046 ADC.gif R1046 ADC log.gif

At 1350 Volts HV of Sense wire the count rate seemed like dropped, so i did scaler measurements again twice when the brick was out, and i got the following result: 27 % instead of 10 %. (2867 - 1116 - 776) .

Position measurements

Scaler and ADC Measurements

On y axis of ADC Histograms i have number of events per second.

Run # Brick In/Out rep rate (Hz) current (ma) Distance from the Endplate of DCSenseWire4 (inches) Number RF gates (SCAL13) Number Coincidences (SCAL08) DC coinc with 3PMT + RF gate (SCAL02) Rate SCAL02/SCAL13 (%) DC_ADC Histograms(ADC15 && ADC8(FC)>1000) DC_ADC Histograms(ADC15>80 && FC>1000) Rate% (ADC15>80&&FC>1000) Rate % (ADC15>80&&FC>1000/ADC15&&ADC8(FC)>1000)
1028 Out 900 65 1" 3561 1462 819 22 HRRL 16-04-09 DCS4 1450Volts PosMeas 1028.gif HRRL 16-04-09 DCS4 1450Volts PosMeas 1028 1.gif
1029 Out 900 65 2" 9988 4012 2480 25 HRRL 16-04-09 DCS4 1450Volts PosMeas 1029.gif HRRL 16-04-09 DCS4 1450Volts PosMeas 1029 1.gif
1030 Out 900 65 3" 4738 1943 1217 25 HRRL 16-04-09 DCS4 1450Volts PosMeas 1030.gif HRRL 16-04-09 DCS4 1450Volts PosMeas 1030 1.gif
1031 Out 900 65 4" 4683 1891 1214 26 HRRL 16-04-09 DCS4 1450Volts PosMeas 1031.gif HRRL 16-04-09 DCS4 1450Volts PosMeas 1031 1.gif
1032 Out 900 65 6" 2440 1001 619 26 HRRL 16-04-09 DCS4 1450Volts PosMeas 1032.gif HRRL 16-04-09 DCS4 1450Volts PosMeas 1032 1.gif
1033 Out 900 65 7.5" 3420 1414 965 28 HRRL 16-04-09 DCS4 1450Volts PosMeas 1033.gif HRRL 16-04-09 DCS4 1450Volts PosMeas 1033 1.gif
1041 Out 900 65 -2" 4570 1843 41 0.9 HRRL 16-04-09 DCS4 1450Volts PosMeas 1041.gif HRRL 16-04-09 DCS4 1450Volts PosMeas 1041 1.gif
1039 In 900 65 1" 4074 1342 388 10 HRRL 16-04-09 DCS4 1450Volts PosMeas 1039.gif HRRL 16-04-09 DCS4 1450Volts PosMeas 1039 1.gif
1038 In 900 65 2" 5242 1681 554 10 HRRL 16-04-09 DCS4 1450Volts PosMeas 1038.gif HRRL 16-04-09 DCS4 1450Volts PosMeas 1038 1.gif
1037 In 900 65 3" 2366 755 261 11 HRRL 16-04-09 DCS4 1450Volts PosMeas 1037.gif HRRL 16-04-09 DCS4 1450Volts PosMeas 1037 1.gif
1036 In 900 65 4" 2437 821 287 12 HRRL 16-04-09 DCS4 1450Volts PosMeas 1036.gif HRRL 16-04-09 DCS4 1450Volts PosMeas 1036 1.gif
1035 In 900 65 6" 2926 904 320 11 HRRL 16-04-09 DCS4 1450Volts PosMeas 1035.gif HRRL 16-04-09 DCS4 1450Volts PosMeas 1035 1.gif
1034 In 900 65 7.5" 3948 1247 408 10 HRRL 16-04-09 DCS4 1450Volts PosMeas 1034.gif HRRL 16-04-09 DCS4 1450Volts PosMeas 1034 1.gif
1040 In 900 65 -2" 5516 1780 18 0.3 HRRL 16-04-09 DCS4 1450Volts PosMeas 1040.gif HRRL 16-04-09 DCS4 1450Volts PosMeas 1040 1.gif

Scaler Results

[math]Rate = \frac{Coinc(DC+PMT+RFGate)}{RF Gate} \times 100 %[/math]

Data Summery Table
Distance from the Endplate of DCSenseWire4 (inches) Rate % (BrickOut-BrickIn) Rate % (Brick In) Rate % (Brick Out)
1" 12 [math]\pm[/math] 0.53 10 [math]\pm[/math]0.3 22 [math]\pm[/math] 0.2
2" 12 [math]\pm[/math] 0.52 10 [math]\pm[/math] 0.3 25 [math]\pm[/math] 0.2
3" 15 [math]\pm[/math] 0.5 11 [math]\pm[/math] 0.3 25 [math]\pm[/math] 0.2
4" 14 [math]\pm[/math] 0.48 12 [math]\pm[/math] 0.3 26 [math]\pm[/math] 0.19
6" 15 [math]\pm[/math] 0.5 11 [math]\pm[/math] 0.3 26 [math]\pm[/math] 0.19
7.5 " 18 [math]\pm[/math] 0.51 10 [math]\pm[/math] 0.3 28 [math]\pm[/math] 0.19
-2 0.6 [math]\pm[/math] 2.88 0.9 [math]\pm[/math] 1 0.3 [math]\pm[/math] 1.8

DCMetalica Position vs Rate 1450Volts 4-20-09.jpgDCMetalica Position vs Rate 1450Volts 4-20-09 ShutterIn Out out-In.jpg

ADC Results

Example Calculating the mean value of Rate

I chose r1028.root file. The run was broken into three runs. For each run Faraday Cup was made(FC>1000).

FC HRRL 16-04-09 r1028.gifFC HRRL 16-04-09 r1028 after cut.gif

Run divided into three separate files:


ADC HRRL 16-04-09 r1028 1.gifADC HRRL 16-04-09 r1028 2.gifADC HRRL 16-04-09 r1028 3.gif

[math]Rate % = \frac{ADC Counts (FC\gt 1000 ADC\gt 80)}{ADC Counts(FC\gt 1000)} \times 100 %[/math]

THe mean value and error for each file was done using the weighted error propagation [1].



Data Summery Table


Distance from the Endplate of DCSenseWire4 (inches) Rate % (BrickOut-BrickIn) Rate % (Brick Out) Rate % (Brick In)
1" 17 [math]\pm[/math] 0.87 28 [math]\pm[/math]0.4 11 [math]\pm[/math] 0.47
2" 21 [math]\pm[/math] 1.23 35 [math]\pm[/math] 0.48 14 [math]\pm[/math] 0.75
3" 20 [math]\pm[/math] 1.34 36 [math]\pm[/math] 0.44 16 [math]\pm[/math] 0.9
4" 21 [math]\pm[/math] 1.4 38 [math]\pm[/math] 0.6 17 [math]\pm[/math] 0.8
6" 22 [math]\pm[/math] 1.297 39 [math]\pm[/math] 0.557 17 [math]\pm[/math] 0.74
7.5 " 22 [math]\pm[/math] 1.32 39 [math]\pm[/math] 0.48 17 [math]\pm[/math] 0.84
-2 0.3 [math]\pm[/math] 0.97 2.7 [math]\pm[/math] 0.4 2.4 [math]\pm[/math] 0.57

HRRL 16-04-09 Position vs Rate ADCMeasuremts AllData UsingSimpleErrorCalculation.jpg

Example Calculating Weighted Error

[math]\sigma _{\bar{X}} = \sqrt{\frac{1}{\Sigma _i \sigma_i^{-2}}} = \sqrt{\frac{1}{(\frac{1}{\sqrt{17642}})^{-2} + (\frac{1}{\sqrt{17679}})^{-2} + (\frac{1}{\sqrt{17631}})^{-2}}} = 0.4 %[/math]


Puts cuts on ADC data until rate is the same as with scaler data then overlay position measurements plots

DC efficiency

Plot histogram for all runs to check if pedestal is in same location.

Some ADC runs had 3 scintillators in coincidence. Use this to check DC efficiency. plot as function of HV the ratio of DC hits to coincidences. use the ADC value for the wire output to do several different signal thresholds.



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