12 10 2012 HRRL DetectorTests

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

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

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

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

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.

Rate (gamma/pulse)	Beam COnfig (E,pulse width,peak current)	Configuration
51/3031 = 1/60	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	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
	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

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

Electron/photon ratio

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