Qweak Qsqrd Tracking - Revision history

Oborn: /* Qqsrd Error code */

2009-08-07T15:07:32Z

Qqsrd Error code

2009-02-15T00:18:25Z

Tracking system Description

2009-02-15T00:17:10Z

Error using only R1

2009-02-15T00:16:24Z

Error using only R1

2009-02-15T00:14:30Z

Error using only R1

2009-02-15T00:14:08Z

Error using only R1

2009-02-15T00:13:23Z

Error using only R1

2009-02-14T21:58:03Z

Error using only R1

2009-02-14T21:57:52Z

Error using only R1

2009-02-14T21:57:20Z

Error using only R1

← Older revision		Revision as of 15:07, 7 August 2009
Line 53:		Line 53:

	[[Qweak_Qsqrd_Error_Code_2Trackers]]		[[Qweak_Qsqrd_Error_Code_2Trackers]]
		+
		+	= References=
		+
		+	[http://arxiv.org/abs/0908.0851 Track fitting by Kalman Filter method for a prototype cosmic ray muon detector]

← Older revision		Revision as of 00:18, 15 February 2009
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	=Tracking system Description=		=Tracking system Description=

−	The Qweak tracking system is composed of three tracking regions. Region 1 is a GEM based ionization chamber which measures the radial distance of a hit from the beam pipe center and is located 50 cm away from a 20 cm long target. Region 2 is a drift chamber with 6 layers located ~~1.5~~ m from target center. A Torous magnet is place centered 2 meters from the target which selects elasticly scattered electrons that pass through a primary collimator just before the magnet. Region 2 is another drift chamber located just in front of the quartz cherenkov detectors. A scintillator appears after the quartz cherenkov detector which is used to trigger the tracking system.	+	The Qweak tracking system is composed of three tracking regions. Region 1 is a GEM based ionization chamber which measures the radial distance of a hit from the beam pipe center and is located 132 cm away from a 35 cm long target. Region 2 is a drift chamber with 6 layers located XXX m from target center. A Torous magnet is place centered 2 meters from the target which selects elasticly scattered electrons that pass through a primary collimator just before the magnet. Region 2 is another drift chamber located just in front of the quartz cherenkov detectors. A scintillator appears after the quartz cherenkov detector which is used to trigger the tracking system.

@@ Line 34: / Line 34: @@
 then
-:<math>\frac{\delta \tan(\theta)}{\tan \theta}= 0.27 \approx \frac{\delta \theta}{\theta}</math>
+:<math>\frac{\delta \tan(\theta)}{\tan \theta}= 0.27 \approx \frac{\delta \theta}{\theta}</math>; dominated by <math>\delta Z</math> error.
 :<math>\Rightarrow \frac{\delta Q^2}{Q^2} = 54%</math> with Term "B" above being the biggest contributor to the error because <math>\frac{\delta Z}{Z}</math> = 26%

@@ Line 35: / Line 35: @@
 :<math>\frac{\delta \tan(\theta)}{\tan \theta}= 0.27 \approx \frac{\delta \theta}{\theta}</math>
-:<math>\Rightarrow \frac{\delta Q^2}{Q^2} = 54%</math> with Term "B" above being the biggest contributor to the error
+:<math>\Rightarrow \frac{\delta Q^2}{Q^2} = 54%</math> with Term "B" above being the biggest contributor to the error because <math>\frac{\delta Z}{Z}</math> = 26%
 ==Using only R1 and R2==

@@ Line 34: / Line 34: @@
 then
-;<math>\frac{\delta \tan(\theta)}{\tan \theta}= 0.27 \approx \frac{\delta \theta}{\theta}</math>
+:<math>\frac{\delta \tan(\theta)}{\tan \theta}= 0.27 \approx \frac{\delta \theta}{\theta}</math>
-;<math>\Rightarrow \frac{\delta Q^2}{Q^2} = 54%</math> with Term "B" above being the biggest contributor to the error
+:<math>\Rightarrow \frac{\delta Q^2}{Q^2} = 54%</math> with Term "B" above being the biggest contributor to the error
 ==Using only R1 and R2==

← Older revision		Revision as of 00:13, 15 February 2009
Line 35:		Line 35:

	;<math>\frac{\delta \tan(\theta)}{\tan \theta}= 0.27 \approx \frac{\delta \theta}{\theta}</math>		;<math>\frac{\delta \tan(\theta)}{\tan \theta}= 0.27 \approx \frac{\delta \theta}{\theta}</math>
		+	;<math>\Rightarrow \frac{\delta Q^2}{Q^2} = 54%</math>

	==Using only R1 and R2==		==Using only R1 and R2==