1-2-07 Tuning

We just received authorization for electrons into the experimental cell.

PMT HV = 1120 Volts Disciminator = 200 mV

Before doing that we made measurements in the accelerator hall using a scintillator. An aluminum brick was placed in front of the scintillator in order to determine gamma contamination.

1. 16 k/min :Gun off, 90 degree bend, integrate over RF pulse, alum block covereing scint
2. 6.5k/min: Gun off, tuned to zero degree port, in RF pulse, alum block covereing scint
3. 50k/min : Gun off, 90 degree bend, over RF pulse, alum block out
4. 16k/min : Gun off, 90 degree bend dipoles looking at 15 MeV side of pulse, int over RF pulse, block out
5. 850 /min: Gun off, 90 degree bend dipoles looking at 15 MeV side of pulse, integrate over Gun pulse, block out
6. 2.8 k/min : Gun On, 90 degree bend dipoles looking at 15 MeV side of pulse, integrate over RF pulse, block out, Decrease accel cavity potential
7. 2.3 k/min : Gun On, 90 degree bend dipoles looking at 15 MeV side of pulse, integrate over Gun pulse, block out, Decrease accel cavity potential, small voltage on anode, small voltage on anode

We were able to accelerate electrons to the Accelerator side of the 1/8 inch collimator and get a rate of 60 Hz within the Gun pulse and zero electron were observed outside the gun pulse. In other words the Field emmision electrons were almost eliminated. Although the gun pulse was 100 ns long we observed a pulse width on the scintilator that was about 200 ns long.

brick out 1700 cnts/min 2800 cnts/min brick in 400 cnts/min 860