CHIPS Run Feb-2008
2-25-08
Configure 25 Mev Beam line
NaI Detector
PMT HV 1500 Co-60 1microCi source: 1MeV band at about 55mV
PMT HV 1500 no source, noisey tube
Beam Profile
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
_______________________________________________
Beam on
3:20:
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.