Foretony: /* Electron/photon ratio */

2012-12-14T04:54:52Z

Electron/photon ratio

Foretony: /* Increased PMT Voltage by 100 and decrease beam current */

2012-12-14T04:54:18Z

Increased PMT Voltage by 100 and decrease beam current

Foretony: /* 2/11/12 */

2012-12-14T04:50:35Z

2/11/12

Foretony: Created page with "=2/11/12= HRRL_12-12-12 =RunPlan= ==BeamTune== Tune beam into zero line, max current, 10.5 MeV energy, 20 ns width, 300 Hz rep rate For Reference, below is the the tune used …"

2012-12-14T04:50:25Z

Created page with "=2/11/12= HRRL_12-12-12 =RunPlan= ==BeamTune== Tune beam into zero line, max current, 10.5 MeV energy, 20 ns width, 300 Hz rep rate For Reference, below is the the tune used …"

New page

=2/11/12=

HRRL_12-12-12
=RunPlan=

==BeamTune==

Tune beam into zero line, max current, 10.5 MeV energy, 20 ns width, 300 Hz rep rate

For Reference, below is the the tune used on last day of July 2012 Positron run

https://wiki.iac.isu.edu/index.php/Beam_Test_Jul_27_2012#Tune

==Measure Emittance==

==Ilyusha Background measurements==

Previous Background tests during 2n correlation run

https://wiki.iac.isu.edu/index.php/2n_BKG_data

HV=1000
CFD = -12 mV

Previous run during neutron correlation experiment found 1 gamma/15 electron beam pulses

Tune beam into zero line, max current, 10.5 MeV energy, 20 ns width, 300 Hz rep rate

1.) Take a run with no shielding around Ilyusha

2.) Move Pb bricks around the scintillator to determine direction of background

3.) add shielding to accelerator

=== compare previous measurements & adjust threshold & Width ===

{| border="1" cellpadding="20" cellspacing="0"
|-
| Rate (gamma/pulse)
| 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)
|-
| 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
|-
|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
|-
| 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
|-
| 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
|-
| 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
|-
| 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
|-
| 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
|-
| 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
|-
|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
|-
|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
|-
|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
|-
|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
|-
|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
|-
|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
|-
|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>

beam current decreased from 5 to 3 mA during the measurements ; must measure beam current for each measurement.

[[File:12102012_CFDcal.jpg | 200 px]]

===Add 3 Pb Bricks to accelerator side===

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.

{| 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>

adding 5" of Pb between detector and accelerator decreased the rate from to 1/60 beam pulses

The cosmic + RF noise rate = 1/50 pulses

=== Increased PMT Voltage by 100 and decrease beam current===

{| border="1" cellpadding="20" cellspacing="0"
|-
| Rate (gamma/pulse)
| 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
|-
| 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

|}<br>

==Electron/photon ratio==

Compare magnet in and out using a scintillator at the exit window of the 90 degree line.

← Older revision		Revision as of 04:54, 14 December 2012
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	[[File:FC90_121212_A.png \| 200 px]]		[[File:FC90_121212_A.png \| 200 px]]

−	~~==Electron/photon ratio==~~	+	[[12_10_2012_HRRL_DetectorTests]]
−
−	~~Compare magnet in and out using a scintillator at the exit window of the 90 degree line.~~

← Older revision		Revision as of 04:50, 14 December 2012
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−	~~=2/11/12=~~
−
−	~~HRRL_12-12-12~~
	=RunPlan=		=RunPlan=

@@ Line 147: / Line 147: @@
 |}<br>
 ==Electron/photon ratio==
 Compare magnet in and out using a scintillator at the exit window of the 90 degree line.

HRRL Dec 12 2012Run - Revision history

Foretony: /* Electron/photon ratio */

Foretony: /* Increased PMT Voltage by 100 and decrease beam current */

Foretony: /* 2/11/12 */

Foretony: Created page with "=2/11/12= HRRL_12-12-12 =RunPlan= ==BeamTune== Tune beam into zero line, max current, 10.5 MeV energy, 20 ns width, 300 Hz rep rate For Reference, below is the the tune used …"