Difference between revisions of "CHIPS Run Feb-2008"
| Line 30: | Line 30: | ||
==Beam on == | ==Beam on == | ||
| − | + | ===15:20:=== | |
Turned beam on zero degree port and NaI lights up whan positioned just after the beam pipe window. | Turned beam on zero degree port and NaI lights up whan positioned just after the beam pipe window. | ||
| Line 37: | Line 37: | ||
[[Image:NaI_Pulse_2-24-08.png | 400 px]] | [[Image:NaI_Pulse_2-24-08.png | 400 px]] | ||
| + | |||
| + | ===15:30:=== | ||
| + | |||
| + | |||
| + | Now move NaI detector so it is near experimental Cell wall. Just inside the wall | ||
| + | |||
| + | Gamma rate goes to zero! | ||
| + | |||
| + | [[Image:NaI_Pulse_2-24-08_1.png | 400 px]] | ||
Revision as of 22:32, 26 February 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
15:20:
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.
15:30:
Now move NaI detector so it is near experimental Cell wall. Just inside the wall
Gamma rate goes to zero!
