MiniDC Signals 10-0-07 - Revision history

Oborn at 19:50, 23 October 2007

2007-10-23T19:50:46Z

Oborn at 19:50, 23 October 2007

2007-10-23T19:50:35Z

Oborn at 15:38, 23 October 2007

2007-10-23T15:38:26Z

Oborn at 18:11, 12 October 2007

2007-10-12T18:11:26Z

Oborn at 15:48, 10 October 2007

2007-10-10T15:48:27Z

Oborn at 15:47, 10 October 2007

2007-10-10T15:47:56Z

Oborn at 15:45, 10 October 2007

2007-10-10T15:45:38Z

Oborn at 01:51, 10 October 2007

2007-10-10T01:51:21Z

Oborn at 01:50, 10 October 2007

2007-10-10T01:50:31Z

Oborn at 01:48, 10 October 2007

2007-10-10T01:48:56Z

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 The Scintillator mounted on top of the Chamber was set to -900 Volts
-Below is a scope picture representing the observation of a coincidence event between a particle which passed through both the top scintillator and the Mini Drift Chamber.  The scope was triggered on the scintillator output.  The top trace is the output of the drift chamber from one of the sense wires capacitively coupled to the scope and terminated in 50 Ohm.  The bottom trace is the fast output from the Scintilaltor.
+Below is a scope picture representing the observation of a coincidence event between a particle which passed through both the top scintillator and the Mini Drift Chamber.  The scope was triggered on the scintillator output.  The top trace is the output of the drift chamber from one of the sense wires capacitively coupled to the scope and terminated in 50 Ohm.  The bottom trace is the fast output from the Scintillator.
 [[Image:MiniChamber_CosmicCoincidence_10-9-07.jpg | 400 px]]

@@ Line 21: / Line 21: @@
 The Scintillator mounted on top of the Chamber was set to -900 Volts
-Below is a scope picture representing the observation of a coincidence event between a particle which passed through both the top scintillator and the Mini Drift Chamber.  The scope was triggered on the scintillator output.  The top trace is the output of the drift chamber from one of the sense wires capacitively coupled to the scope and terminated in 1 Meg Ohm.  The bottom trace is the fast output from the Scintilaltor.
+Below is a scope picture representing the observation of a coincidence event between a particle which passed through both the top scintillator and the Mini Drift Chamber.  The scope was triggered on the scintillator output.  The top trace is the output of the drift chamber from one of the sense wires capacitively coupled to the scope and terminated in 50 Ohm.  The bottom trace is the fast output from the Scintilaltor.
 [[Image:MiniChamber_CosmicCoincidence_10-9-07.jpg | 400 px]]

← Older revision		Revision as of 15:38, 23 October 2007
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	[[Image:MiniChamber_CosmicCoincidence_10-9-07.jpg \| 400 px]]		[[Image:MiniChamber_CosmicCoincidence_10-9-07.jpg \| 400 px]]

−	Noise Level Measured by scope in infinite persistance mode indicate that the Mini Prototype with plastic feedthroughs (Plastica) has noise levels spanning +/- 8 mV. A PMT connected to a scintillator shows noise levels around+/- 2 mV.	+	Noise Level Measured by scope in infinite persistance mode indicate that the Mini Prototype with plastic feedthroughs (Plastica) has noise levels spanning +/- 10 mV (10 Mv peak-to-peak). A PMT connected to a scintillator shows noise levels around+/- 2 mV.

← Older revision		Revision as of 18:11, 12 October 2007
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	[[Image:MiniChamber_CosmicCoincidence_10-9-07.jpg \| 400 px]]		[[Image:MiniChamber_CosmicCoincidence_10-9-07.jpg \| 400 px]]

−	Noise Level Measured by scope in infinite persistance mode indicate that the Mini Prototype with plastic feedthroughs (Plastica) has noise levels spanning +/- 10 mV. A PMT connected to a scintillator shows noise levels around+/- 2 mV.	+	Noise Level Measured by scope in infinite persistance mode indicate that the Mini Prototype with plastic feedthroughs (Plastica) has noise levels spanning +/- 8 mV. A PMT connected to a scintillator shows noise levels around+/- 2 mV.

← Older revision		Revision as of 15:48, 10 October 2007
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−	Signals were observed in the LDS on the Mini DC prototype sense wires capacitively coupled to a digital oscilloscope. The drift chamber was filled with a Ar/CO2 (75/25) gas mixture. A UPS was used to filter the line noise to the scope and NIM bin housing the Power supply. The noise level was 40 mV peak-to-peak when I started and was cut in half in the end after adding the UPS and a grounding strap between the chamber and the scope. ~~I think the~~ grounding strap was the most effective at reducing the noise.	+	Signals were observed in the LDS on the Mini DC prototype sense wires capacitively coupled to a digital oscilloscope. The drift chamber was filled with a Ar/CO2 (75/25) gas mixture. A UPS was used to filter the line noise to the scope and NIM bin housing the Power supply. The noise level was 40 mV peak-to-peak when I started and was cut in half in the end after adding the UPS and a grounding strap between the chamber and the scope. The grounding strap was the most effective at reducing the noise.

	The apparatus		The apparatus

← Older revision		Revision as of 15:47, 10 October 2007
Line 1:		Line 1:
−	Signals were observed in the LDS on the Mini DC prototype sense wires capacitively coupled to a digital oscilloscope. The drift chamber was filled with a Ar/CO2 (75/25) gas mixture.	+	Signals were observed in the LDS on the Mini DC prototype sense wires capacitively coupled to a digital oscilloscope. The drift chamber was filled with a Ar/CO2 (75/25) gas mixture. A UPS was used to filter the line noise to the scope and NIM bin housing the Power supply. The noise level was 40 mV peak-to-peak when I started and was cut in half in the end after adding the UPS and a grounding strap between the chamber and the scope. I think the grounding strap was the most effective at reducing the noise.

	The apparatus		The apparatus

← Older revision		Revision as of 15:45, 10 October 2007
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−	A few ~~Characteristic~~ scope pictures of ~~event~~ triggered on the chamber output. The trigger threshold was set to ~-14 mV for all but the last picture which was set at -17 mV. Signals ~~beyond~~ -14 mV are ~~beond~~ the ~~intrinsic~~ detector noise and considered ionization events.	+	A few characteristic scope pictures of events triggered on the chamber output. The trigger threshold was set to ~-14 mV for all but the last picture which was set at -17 mV. Signals below -14 mV are beyond the detector noise measured above and considered ionization events.

	[[Image:MiniChamber_Singles_A_10-9-07.jpg \| 400 px]]		[[Image:MiniChamber_Singles_A_10-9-07.jpg \| 400 px]]

← Older revision		Revision as of 01:51, 10 October 2007
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−	A few Characteristic scope pictures of event triggered on the chamber output. The trigger threshold was set to ~-14 mV for all but the last picture which was set at -17 mV. Signals beyond -14 mV are ~~well outside~~ the intrinsic detector noise and considered ionization events.	+	A few Characteristic scope pictures of event triggered on the chamber output. The trigger threshold was set to ~-14 mV for all but the last picture which was set at -17 mV. Signals beyond -14 mV are beond the intrinsic detector noise and considered ionization events.

	[[Image:MiniChamber_Singles_A_10-9-07.jpg \| 400 px]]		[[Image:MiniChamber_Singles_A_10-9-07.jpg \| 400 px]]

← Older revision		Revision as of 01:50, 10 October 2007
Line 25:		Line 25:
	[[Image:MiniChamber_CosmicCoincidence_10-9-07.jpg \| 400 px]]		[[Image:MiniChamber_CosmicCoincidence_10-9-07.jpg \| 400 px]]

−	Noise Level Measured by scope in infinite persistance mode indicate that the Mini Prototype with plastic feedthroughs (Plastica) has noise levels spanning +/- 10 mV. A PMT connected to a scintillator shows noise levels around+/- 2.5 mV.	+	Noise Level Measured by scope in infinite persistance mode indicate that the Mini Prototype with plastic feedthroughs (Plastica) has noise levels spanning +/- 10 mV. A PMT connected to a scintillator shows noise levels around+/- 2 mV.

← Older revision		Revision as of 01:48, 10 October 2007
Line 1:		Line 1:
−	Signals were observed in the LDS on the Mini DC prototype ~~using~~ Ar/CO2 (75/25) gas.	+	Signals were observed in the LDS on the Mini DC prototype sense wires capacitively coupled to a digital oscilloscope. The drift chamber was filled with a Ar/CO2 (75/25) gas mixture.

	The apparatus		The apparatus