PMT timing offsets - Revision history

Burgjeff at 23:49, 3 September 2017

2017-09-03T23:49:24Z

2017-09-03T23:49:09Z

2017-09-03T23:48:38Z

2017-09-03T23:48:18Z

2017-09-03T23:47:58Z

2017-09-03T23:47:47Z

2017-09-03T23:46:42Z

2017-09-03T23:45:51Z

2017-09-03T23:45:07Z

2017-09-03T23:42:29Z

← Older revision		Revision as of 23:49, 3 September 2017
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−	Here are the offsets used, in ns (there are 10 TDC ~~chs~~ per ns):	+	Here are the offsets used, in ns (there are 10 TDC channels per ns):

	float D30T_offset = -17.2;		float D30T_offset = -17.2;

← Older revision		Revision as of 23:49, 3 September 2017
Line 20:		Line 20:


−	Here are the offsets used:	+	Here are the offsets used, in ns (there are 10 TDC chs per ns):

	float D30T_offset = -17.2;		float D30T_offset = -17.2;

← Older revision		Revision as of 23:48, 3 September 2017
Line 20:		Line 20:


−	~~These~~ are the ~~resulting~~ offsets:	+	Here are the offsets used:

	float D30T_offset = -17.2;		float D30T_offset = -17.2;

@@ Line 6: / Line 6: @@
 Finally, a single offset is applied to all PMTs in order to center the photon peak around 4 ns, since 4 ns is the time it takes light to travel the distance from target to detector.
 Below is Al target minus MT target after calibration offsets are applied:
@@ Line 12: / Line 13: @@
 [[File:TimeCalibratedPhotonPeak.png|700px]]
-Here is the most recent CF252 run with the same offsets:
 [[File:CF252TimingCalibration.png|650 px]]

← Older revision		Revision as of 23:47, 3 September 2017
Line 4:		Line 4:

	Next, I take the difference between per-pulse-normalized TDC spectra of empty target and Al target.		Next, I take the difference between per-pulse-normalized TDC spectra of empty target and Al target.
		+
	Finally, a single offset is applied to all PMTs in order to center the photon peak around 4 ns, since 4 ns is the time it takes light to travel the distance from target to detector.		Finally, a single offset is applied to all PMTs in order to center the photon peak around 4 ns, since 4 ns is the time it takes light to travel the distance from target to detector.

@@ Line 3: / Line 3: @@
 First, I used the clean photon peak from a CF252 run to synchronize all the detectors. Here is what the timing spectra look like after these offsets are applied:
-[[File:CF252TimingCalibration.png|650 px]]
+Next, I take the difference between per-pulse-normalized TDC spectra of empty target and Al target.
-Below is Al target minus MT target after calibration  offsets are applied:
+[[File:TimeCalibratedPhotonPeak.png|700px]]
 These are the resulting offsets:

← Older revision		Revision as of 23:46, 3 September 2017
Line 7:		Line 7:

	Next, I take the difference between per-pulse-normalized TDC spectra of empty target and Al target. Finally, a single offset is applied to all PMTs in order to center the photon peak around 4 ns, since 4 ns is the time it takes light to travel the distance from target to detector.		Next, I take the difference between per-pulse-normalized TDC spectra of empty target and Al target. Finally, a single offset is applied to all PMTs in order to center the photon peak around 4 ns, since 4 ns is the time it takes light to travel the distance from target to detector.
		+
		+	Below is Al target minus MT target after calibration offsets are applied:

← Older revision		Revision as of 23:45, 3 September 2017
Line 9:		Line 9:


−		+	[[File:TimeCalibratedPhotonPeak.png\|700px]]

	These are the resulting offsets:		These are the resulting offsets:

← Older revision		Revision as of 23:45, 3 September 2017
Line 6:		Line 6:


−	Next, I take the difference between per pulse normalized TDC spectra of empty target ~~runs~~ and Al ~~runs~~. ~~Next~~, a single offset is applied to all ~~detectors so that~~ the photon peak ~~lies at~~ 4 ns ~~- or~~ the time it takes light to travel the distance from target to detector.	+	Next, I take the difference between per-pulse-normalized TDC spectra of empty target and Al target. Finally, a single offset is applied to all PMTs in order to center the photon peak around 4 ns, since 4 ns is the time it takes light to travel the distance from target to detector.

@@ Line 7: / Line 7: @@
 Next, I take the difference between per pulse normalized TDC spectra of empty target runs and Al runs. Next, a single offset is applied to all detectors so that the photon peak lies at 4 ns - or the time it takes light to travel the distance from target to detector.
 These are the resulting offsets:
 float D30T_offset = -17.2;