Improvements HRRL Positron Runs July 2012

1. Make T2 holder without vertical 45 deg angle.

2. Improve TDC inputs, and DAQ system (use veto on the CFD).

3. Put better (more sensitive, thicker) scintillator at the exit of 90 deg, so I can measure the numbers of positrons.

4. Take more data on 3 MeV and 4 MeV positrons.

5. Measure the energy spread of positrons by changing slit width for different energies (1, 2, 3, 4, MeV).

6. It seems we don't need the ion pump at 90 deg beamline, it can be removed next time.

7.

Run Plan

Positron rate measurements

Target in , Target out, Sweep magnet