August 24, 2007 - Cosmic Telescope

This is the data explained on the page of August 23.

The three points with 175 mV, 200 mV, and 300 mV on both were taken just to reassure the tendencies of the scintillators at different thresholds.

Plateau Zeroing
Time	Threshold on top scint.	Threshold on bottom scint.	Singles Count (on top)	Coinc. Counts	Coinc. per minute
30 min	225	225	2108	77	2.57
30 min	250	225	1874	74	2.47
30 min	275	225	1656	78	2.6
30 min	225	250	2697	83	2.77
30 min	250	250	2333	85	2.83
30 min	275	250	1848	82	2.73
30 min	225	275	2606	56	1.87
30 min	250	275	2022	47	1.57
30 min	275	275	1768	76	2.53
30 min	175	175	3787	94	3.13
30 min	200	200	2675	69	2.3
30 min	300	300	1580	57	1.9

This is a graph of the three main sets of points.

After all these experiments, the scintillators will be set at a High Voltage of 1250 Volts and with a Threshold of 225 mV. Longer term measurements are now commencing. With these voltages and thresholds, a measurement was started at 5:13 pm on 8-24 with the telescope vertical (0 degrees). Tomorrow the measurement will stop and we will set the thresholds at 250 just to make sure that the range is still working. That will run until monday. All the data will be put on the page for Monday the 27th.