Positrons Using 40Mev Linac

Detector Calibrations

Electron and Positron dE/dx for NaI

energy	dE/dx for e- (MeV/cm)	dE/dx for e+ (MeV/cm)
8	4.54 +/- 1.05	4.40 +/- 1.03
5	4.36 +/- 1.11	4.22 +/- 1.08
3	4.12 +/- 1.19	4.03 +/- 1.16

10/13/13

PositronDetectorCal_4_40MeV

Run configuration

1. calibrate the NaI detector by sending 5->10 MeV electrons from the 44 machine directly into the NaI detector while the electron current is just above dark current. Use the magnet to deflect the electrons away from the crystal to measure the photon background.

MSC from Air -vs- He

Run list

10/14/13

PosRun_10_14_2013

Positrons#Experiments