12 10 2012 HRRL DetectorTests

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

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