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.
12/13/12
Worked on establishing a small spot size on the Phosphorous target and then documenting the beam properties.
12/14/12
Worked on establishing a small spot size on the Phosphorous target and then documenting the beam properties.
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 |
Take data using 3 MeV Positrons on the T2 target.
The Scintillator known as Kelly is has an output of about 1 Volt.
ADC9 = NaI right
| Run # | Configuration |
| 4621 | T1 and T2 are in, Veto discrimnator, threshold is 5 mV, Kelly at 3.5 Volt ,rate is 0.2 Hz |