Positrons Using 40Mev Linac

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Detector Calibrations

Electron and Positron dE/dx for NaI

Energy (MeV) 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

10172013 6MeV MSC KE.png10172013 6MeV MSC angle.png

10232013 XY.png

Kinematics

The energy and angular correlation distribution of electrons exiting a 2mm thick Tungsten Target for 1 million 42 MeV incident beam. (Zoomed in to the less than 12 MeV range)

E-vs-Theta 42MeV e-.pngE-vs-Theta 42MeV e+.png

Run list

10/14/13

PosRun_10_14_2013

40MeV_BeamLineInstall_10252013


Positrons#Experiments