CHIPS Run Feb-2008
Configure 25 Mev Beam line
1.5 inch FWHM beam profile measured at 8 mA peak current. The units on the beam scan is in inches. so the grid is 2inch by 2 inch (5cm by 5cm). Frequency is 60 Hz.
_________________________________ 4 mA peak current
Turned beam on zero degree port and NaI lights up whan positioned just after the beam pipe window.
Must be gammas Rate = 10 count/sec. Anode amplified (x64) then discriminated and put into a scaler. Threshold on discriminator is 2 Volts and results in zero counts when beam off. NaI PMT at 1500 volts.
Now move NaI detector so it is near experimental Cell wall. Just inside the wall
Gamma rate goes to zero!
Now change scope to 5 sec accumulation. 1 Mev electron should give 55 mV pulse on scope.