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User name Reitz
Log entry time 18:45:42 on August 2,2001
Entry number 68661
keyword=double pulsing on t1
Studied the influence of the discriminator output width and
the appearence of double pulses on T1 (HRS_R)
right arm
runid......t1_old.....t2............ts.......t1_clean..width_l/with_r...*)
21453.....6033......3707........9641.......5993......105/105.........6.67
21454.....9505......5794......15121.......9419........81/81...........9.13
21455.....9260......5674......14696.......9145........60/60.........12.58
21456.....3130......1794........4782.......3069........40/40.........19.88
21457.....4400......2622........6584.......4252......105/40.........34.80
21458....23796....14501.....37904.....23595......105/105.........8.52
left arm
runid........t3..........t4.............ts......t3_clean......width.............**)
2440.....10880.....7130.....17873.....10833......105/105...........4.34
2441.....40260....25900....65677.....40105......105/105...........3.86
*) (T1_old - T1_clean)/T1_clean * 1000.
**) (T3_old - T3_clean)/T3_clean * 1000.
Conclusions:
the amount of double pulses depends on the width of the discriminator
signals.
with the maximum value (105 ns) still some double pulsing remains
(8 doublepulses per 1000 T1 on HRS_R, 4 per 1000 T3 on HRS_L)
Using a gate generator or discriminater with 150 ns cleans most of
those pulses.
The double pulsing can be seen right on the output of the discriminators,
and it is quite often correlated between the left and the right PMT
of one scinti.