Difference between revisions of "GEM Cosmic V792 Measurements"

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=11-07-08=
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=DAQ setup =
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[[Image:Pulse_output_from_the_Stanford_Pulse_Generator_12-13-08.png|150px|thumb|Two Identical '''A''' and '''B''' Pulse Generator Output Signals]][[Image:Amplified_Pulse_the_Stanford_Pulse_Generator_12-13-08.png|150px|thumb| Amplified Pulse Generator output signals '''A_494-09''' && '''B_494-06''']]<br>
 +
 
 +
A Stanford Pulse Generator, Model DG535, was used to create signals similar to the GEM output pulse.  Two identical signals ('''A''' && '''B''') were injected into the Timing Filter Amplifiers to set the amplifier gain of each channel to the same value. Pulse '''A''' was injected to the Timing Filter Amplifier, Model 474-09 and Signal '''B''' was going into the Model 474-09. Integration time was set to 20 ns on each Timing Filter Amplifier. Coarse gain and Fine gain were set so that the Amplification for each channel was the same.
 +
 
 +
After matching the amplifier gain, the output pulse '''A''' from the Timing Filter Amplifier, Model 474-09, was tee'd. One output was amplified again, using Timing Filter Amplifier and the second output was delayed and putted into the ADC with delayed and amplified '''B''' pulse.
 +
 
 +
First two histograms below show the ADC results for two amplified pulses, and the last histogram shows the ratio of ADC1/ADC5. As one can notice, the charge ratio is close to one, mean value is ~ 1.<br>
 +
 
 +
[[Image:Pulse_output_from_the_Stanford_Pulse_Generator_Noise_level_12-13-08.png|150px|thumb| Pulse Genereator Output Noise Levell]][[Image:Amplified_Pulse_the_Stanford_Pulse_Generator_Noise_level_12-13-08.png|150px|thumb| Amplified Pulse Generator Noise Level]]<br>
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[[Image:Amplified_and_delayed_Pulse_the_Stanford_Pulse_Generator_12-13-08.png|150px|thumb|Amplified and Delayed Pulse Generator Output]]<br>
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*Run Number 650.dat<br>
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[[Image:ADC1_SPG_12-13-08.gif|400px]][[Image:ADC5_SPG_12-13-08.gif|400px]]<br>
  
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The pulse coming from the strips is delayed and amplified using the Timing Filter Amplifier Model_474(X6). The amplified pulse is connected to the V792 QDC.<br>
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[[Image:ADC1_over_ADC5SPG_12-13-08.gif|600px]]<br>
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Run 550<br>
 
  
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Start Time: Nov 6 19:58:03; End Time: Nov 7 09:45:57<br>
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=GEM Measurements=
  
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[[Image:ADC_measurement_GEMDetector_HV3800V_ADC1_11-07-08.gif|300px]][[Image:ADC_measurement_GEMDetector_HV3800V_ADC1_11-07-08_Landau_fit.gif|300px]]<br>
 
  
 
=12-10-08=
 
=12-10-08=
Line 21: Line 35:
 
The Threshold on DIFF. CFD is set to 0.70 (ULD=9.9~10 && LLD=0.5)<br>
 
The Threshold on DIFF. CFD is set to 0.70 (ULD=9.9~10 && LLD=0.5)<br>
  
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=12-10(11)-08=
 
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HV Settings: <math>V_{Drift}=3200</math> Volts and <math>V_{GEM}=2900</math> Volts.<br>
 
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Using again only TrigOut and the signal from the Strip.<br>
 
  
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Electronics Setup: done (might change CFD threshold)<br>
 
  
 
=12-11-08=
 
=12-11-08=
Line 36: Line 44:
 
[[Image:TrigOut_electronics_setup_12-11-08.png|250px]][[Image:StripPulse_electronics_setup_12-11-08.png|250px]]<br>
 
[[Image:TrigOut_electronics_setup_12-11-08.png|250px]][[Image:StripPulse_electronics_setup_12-11-08.png|250px]]<br>
  
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==Electronics Setup==
 
  
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TrigOut and the stripsignal, both are used as a pulse and  go to ADC.<br>
 
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The pulse from the Strips is used as a trigger and gate.<br>
 
  
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The pulse from the  trigout is delayed, Amplified by the Timinig Filter Amplifier(Coarse_Gain=X20, Fine_Gain=8.5 && Integrate=20ns).<br>
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=12-13-08=
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Signal from the Strips goes to the Timing Filter Amplifier(Coarse_Gain=X20, Fine_Gain=10.5 && Integrate=20ns). Amplified pulse is devided into two signals,  One is sued as a trigger and gate and second as a pulse for ADC. The first one(gate && trigger) is amplified using the Timing Filter Amplifier(Coarse_Gain=X2, Fine_Gain=10 && Integrate=50ns) and used in DIFF. CFD for gate and trigger. Second output from the Amplified strips, goes to delay box(TENNELEC TC 215 DELAY AMPLIFIER) and putted to the ADC.
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 +
 
 +
 
 +
Below Channel 1 represents StripOut and Channel 2 trigOut.<br>
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The results shown below are for different Diff. CFD values.<br>
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[[Image:Noise_level_On_GEM_detector_HV_3310_3010Volts_12-13-08.png|400px]][[Image:Pulse_On_GEM_detector_HV_3310_3010Volts_12-13-08.png|400px]]<br>
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'''1).''' Threshold Values: Threshold=1.90, ULD=9.65  && LLD=2.10 <br>
 
  
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Run Number is r613<br>
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*Run Number r651<br>
  
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Start time: Dec 11 16:31:42  End Time: Dec 11 17:32:23<br>
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Start Time: Dec 13 19:43:14 and End Time: Dec 14 00:21:47
  
 +
Electronics Settings:
  
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'''2).''' Threshold Values: Threshold=3.10, ULD=9.65  && LLD=2.90 <br>
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'''TrigOut.)'''
 +
Timing Filter Amplifier Model 474-06(Coarse Gain=X10, Fine Gain=5 && Integrate=20ns)<br>
  
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Run Number is r622<br>
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'''StripOut.)'''
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Timing Filter Amplifier Model 474-09(Coarse Gain=X10, Fine Gain=5 && Integrate=20ns)<br>
  
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Start time: Dec 11 19:25:28  End Time: Dec 11 21:53:44<br>
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'''Pulse for DIFF. CFD'''
 +
Timing Filter Amplifier Model 474-02(Coarse Gain=X4, Fine Gain=2 && Integrate=20ns)<br>
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DIFF. CFD(Threshold= 3, LLD=2.80 && ULD=9.55)<br>
  
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[[Image:Charge_leaving_last_GEM_foil-12-11-08_r622.gif|300px]][[Image:Charge_collected_by_the_strips_GEM-1l-12-11-08_r622.gif|300px]]<br>
 
  
 +
The Amplification on Strip pulse and TrigOut is the same. Signal is amplified and delayed after amplification.
  
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'''2).''' Threshold Values: Threshold=3.70, ULD=9.65  && LLD=3.50 <br>
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[[Image:Charge_collected_by_the_strips_and_charge_leaving_last_GEM_foil_Prelim_results_12-13-08.gif|400px]]<br>
  
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Run Number is r624<br>
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Charge leaving last GEM foil divided by the charge that was collected by the Strips.<br>
  
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Start time: Dec 11 21:58:37  End Time: Dec 12 12:19:53 <br>
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[[Image:Charge_leaving_last_GEM_foil_divided_by_the_charge_that_was_collected_by_the_Strips_ADC5_over_ADC_1_12-13-08.gif|500px|thumb|left|Charge leaving last GEM Foil divided by the Charge that was collected by the Strips]]<br>
  
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[[Image:GEM_RUN_Number_r624_charge_collected_by_the_strips_and_charge_leaving_last_GEM_foil-12-12-08.gif|500px]]<br>
 
  
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The result shown  below is reasonable. The charge that left the last GEM foil is greater than the charge collected by the strips.<br>
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[[Image:Charge_leaving_last_GEM_foil_divided_by_the_charge_that_was_collected_by_the_Strips_ADC5_over_ADC1_12-13-08.gif|300px|thumb|left|Charge leaving last GEM Foil divided by the Charge that was collected by the Strips]][[Image:Charge_leaving_last_GEM_foil_divided_by_the_charge_that_was_collected_by_the_Strips_ADC1_over_ADC5_12-13-08.gif|300px|thumb|right| Charge collected by the Strips divided by the Charge leaving last GEM Foil]]<br>
  
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change the picture below so they have the same units and overlay them.  Then plot ADC1/ADC5.  This will tell you the charge collection efficiency if the gains are the same..
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=12-14-08=
  
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I will Dr. Forest
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*Run Number r653
  
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[[Image:Charge_leaving_last_GEM_foil_run_number_r624-12-12-08.gif|350px]][[Image:Charge_collected_by_the_Strips_number_r624-12-12-08.gif|350px]]
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Electronics Settings are the same, only integration time is set to 50ns for both signals(Strip and TrigOut)<br>
  
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=12-12-08=
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Start Time: Dec 14 00:39:31 and End Time: Dec 14 16:07:21
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There is not enough documentation below to illustrate the gain measurement.
 
  
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Take scope pictures of the stanford pulse generator signal which goes into each amplifer. 
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[[Image:Charge_collected_by_the_strips_and_charge_leaving_last_GEM_foil_12-13-08_integration_time_50ns.gif|400px]]<br>
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Then take scope pictures of the stanford pulse as it exits both amplifiers. 
 
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Take data if the pulses are sufficiently similar. 
 
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You could try to gain match the amplifiers such that ADC1/ADC5 = 1.
 
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After the ratio of the amplifier gains are measured you should measure the GEM detector
 
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output from cosmic rays again.
 
  
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Dr. Not because of '''laziness''' andf Not '''motivation''' but I think what was done above is right. I still will do as you want,    because you are the  '''boss'''  and  I am the one who is mentaly unstable, not motivated, future accounter, materialist and what    else I do not remember. i am sure you know bettter who I am :).
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=12-15-08=
  
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Reproducing data.<br>
  
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*Run number r671
  
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Finding out what is gain for each channel using the Stanford pulse generator.
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Start time: Dec 15 15:43:00 Stop time: Dec 15 17:46:23<br>
  
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Setting: <br>
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Electronics Settings:
  
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Run Number: r634 && r635<br>
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'''TrigOut.)'''
 +
Timing Filter Amplifier Model 474-06(Coarse Gain=X10, Fine Gain=5 && Integrate=20ns)<br>
  
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[[Image:Amplified_pulse_for_two_channels.gif|300px]][[Image:Amplified_pulse_for_two_channels_swapped.gif|300px]]
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'''StripOut.)'''
 +
Timing Filter Amplifier Model 474-09(Coarse Gain=X10, Fine Gain=5 && Integrate=20ns)<br>
  
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Original pulse from stanford pulse generator goes to the ADC: r636 && r637<br>
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'''Pulse for DIFF. CFD'''
 +
Timing Filter Amplifier Model 474-02(Coarse Gain=X4, Fine Gain=2 && Integrate=20ns)<br>
 +
DIFF. CFD(Threshold= 3, LLD=2.80 && ULD=9.55)<br>
  
  
−
[[Image:pulse_for_two_channels.gif|300px]][[Image:pulse_for_two_channels_swapped.gif|300px]]<br>
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[[Image:Charge_collected_by_the_strips_12-15-08.gif|350px]]<br>
  
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I used the attenuator for both channels and it was set to the same value: 12dB = 10.7918. 
+
=11-07-08=
  
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<math>X db = 20 log_{10}\frac{I_1}{I_2}</math>
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The pulse coming from the strips is delayed and amplified using the Timing Filter Amplifier Model_474(X6). The amplified pulse is connected to the V792 QDC.<br>
 +
Run 550<br>
  
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<math>\frac{I_1}{I_2} = exp^{12/20} = 3.98</math>
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Start Time: Nov 6 19:58:03; End Time: Nov 7 09:45:57<br>
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==Gain Calculation==
 
  
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Dr. Forest, I still used my way to find out the gain. It is not accurate, but below are shown some first calculations:<br>
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[[Image:ADC_measurement_GEMDetector_HV3800V_ADC1_11-07-08.gif|300px]][[Image:ADC_measurement_GEMDetector_HV3800V_ADC1_11-07-08_Landau_fit.gif|300px]]<br>
  
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Gain_for_Channel_1 = Gain_TrigOut = <math>\frac{175 \times 10.7918}{110} = 17.1688</math><br>
 
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Gain_for_Channel_5 = Gain_Strip = <math>\frac{650 \times 10.7918}{145} = 48.377</math><br>
 
  
 
[http://www.iac.isu.edu/mediawiki/index.php/GEMS Go Back]
 
[http://www.iac.isu.edu/mediawiki/index.php/GEMS Go Back]

Latest revision as of 03:11, 19 December 2008

DAQ setup

Two Identical A and B Pulse Generator Output Signals
Amplified Pulse Generator output signals A_494-09 && B_494-06


A Stanford Pulse Generator, Model DG535, was used to create signals similar to the GEM output pulse. Two identical signals (A && B) were injected into the Timing Filter Amplifiers to set the amplifier gain of each channel to the same value. Pulse A was injected to the Timing Filter Amplifier, Model 474-09 and Signal B was going into the Model 474-09. Integration time was set to 20 ns on each Timing Filter Amplifier. Coarse gain and Fine gain were set so that the Amplification for each channel was the same.

After matching the amplifier gain, the output pulse A from the Timing Filter Amplifier, Model 474-09, was tee'd. One output was amplified again, using Timing Filter Amplifier and the second output was delayed and putted into the ADC with delayed and amplified B pulse.

First two histograms below show the ADC results for two amplified pulses, and the last histogram shows the ratio of ADC1/ADC5. As one can notice, the charge ratio is close to one, mean value is ~ 1.

Pulse Genereator Output Noise Levell
Amplified Pulse Generator Noise Level


Amplified and Delayed Pulse Generator Output


  • Run Number 650.dat

ADC1 SPG 12-13-08.gifADC5 SPG 12-13-08.gif

ADC1 over ADC5SPG 12-13-08.gif

GEM Measurements

12-10-08

The signal below represents a measurement of the Trig out signal from a 10 cm x 10 cm ionization chamber with 3 GEM preamplifiers. The chamber gas a 90/10 % mixture of Arcon and CO2. The Drift HV was set to 3200 Volts and the GEM preamplifier HV distribution network was set to 2900 Volts. The V792 CAEN ADC channels have a gain of 100 fC/channel. The main signal peak appears at channel number 759 and represents an accumulation of [math]75.9 \pm 4[/math] pC of charge.


TrigOutSignal R607.gif

Electronics Settings:

TrigOut goes to Timing Filter Amplifier(Coarse Gain=X6, Fine GAin=7.5ns && Integrate=20ns) and after amplification to ADC
StripOut is used as a trigger and gate. The signal from the strip is amplified by the Timing Filter Amplifier (Coarse Gain=X20, Fine Gain=12.5ns && Integrate=500ns)
The Threshold on DIFF. CFD is set to 0.70 (ULD=9.9~10 && LLD=0.5)


12-11-08

HV Settings: [math]V_{Drift}=3200[/math] Volts and [math]V_{GEM}=2900[/math] Volts.
Gas type 90/10 ArCO2.

TrigOut electronics setup 12-11-08.pngStripPulse electronics setup 12-11-08.png


12-13-08

Below Channel 1 represents StripOut and Channel 2 trigOut.


Noise level On GEM detector HV 3310 3010Volts 12-13-08.pngPulse On GEM detector HV 3310 3010Volts 12-13-08.png

  • Run Number r651

Start Time: Dec 13 19:43:14 and End Time: Dec 14 00:21:47

Electronics Settings:

TrigOut.) Timing Filter Amplifier Model 474-06(Coarse Gain=X10, Fine Gain=5 && Integrate=20ns)

StripOut.) Timing Filter Amplifier Model 474-09(Coarse Gain=X10, Fine Gain=5 && Integrate=20ns)

Pulse for DIFF. CFD Timing Filter Amplifier Model 474-02(Coarse Gain=X4, Fine Gain=2 && Integrate=20ns)
DIFF. CFD(Threshold= 3, LLD=2.80 && ULD=9.55)


The Amplification on Strip pulse and TrigOut is the same. Signal is amplified and delayed after amplification.

Charge collected by the strips and charge leaving last GEM foil Prelim results 12-13-08.gif

Charge leaving last GEM foil divided by the charge that was collected by the Strips.

Charge leaving last GEM Foil divided by the Charge that was collected by the Strips



Charge leaving last GEM Foil divided by the Charge that was collected by the Strips
Charge collected by the Strips divided by the Charge leaving last GEM Foil


12-14-08

  • Run Number r653

Electronics Settings are the same, only integration time is set to 50ns for both signals(Strip and TrigOut)

Start Time: Dec 14 00:39:31 and End Time: Dec 14 16:07:21

Charge collected by the strips and charge leaving last GEM foil 12-13-08 integration time 50ns.gif

12-15-08

Reproducing data.

  • Run number r671

Start time: Dec 15 15:43:00 Stop time: Dec 15 17:46:23

Electronics Settings:

TrigOut.) Timing Filter Amplifier Model 474-06(Coarse Gain=X10, Fine Gain=5 && Integrate=20ns)

StripOut.) Timing Filter Amplifier Model 474-09(Coarse Gain=X10, Fine Gain=5 && Integrate=20ns)

Pulse for DIFF. CFD Timing Filter Amplifier Model 474-02(Coarse Gain=X4, Fine Gain=2 && Integrate=20ns)
DIFF. CFD(Threshold= 3, LLD=2.80 && ULD=9.55)


Charge collected by the strips 12-15-08.gif

11-07-08

The pulse coming from the strips is delayed and amplified using the Timing Filter Amplifier Model_474(X6). The amplified pulse is connected to the V792 QDC.
Run 550

Start Time: Nov 6 19:58:03; End Time: Nov 7 09:45:57

ADC measurement GEMDetector HV3800V ADC1 11-07-08.gifADC measurement GEMDetector HV3800V ADC1 11-07-08 Landau fit.gif


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