12 10 2012 HRRL DetectorTests

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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

HRRL_Dec_19_2012Run

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

12/20/2012

HRRL_Dec_20_2012Run

RF noise measurement

Run # Configuration ADC3 ADC9
4625 Na-22 Source run with RF no beam current R4625 ADC3.png R4625 ADC9.png


RF adds 50 channels of noise to NaI signal and moves Source peak forward.

RF was for 3 MeV electrons, perhaps RF for higher energy electrons will add the remaining 30 channels of noise on the NaI detectors.

NaINoise 232425.png


Positron attempt

Run # Configuration ADC3 ADC9
4632 Transporting 3 MeV positrons, Looks like beam right (ADC9) has 511s beam left (ADC3) swamped with photons 200 px 200 px

12/21/2012

HRRL_Dec_21_2012Run