GEM Efficiency

Qweak GEM High Voltage vs Efficiency

Experimental setup: Qweak GEM detector is sandwiched between the two Drift chambers and two scintillators.

GEM [math]V_{Drift}[/math] Voltage (Volts)	GEM Efficiency %
3550	47.25 [math]\pm[/math] 6.05
3555	60 [math]\pm[/math] 4
3560	83 [math]\pm[/math] 13
3575	95.25 [math]\pm[/math] 3.45

3500/3200

run number is 1365

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100%
4	Top DC(Metalica)		16 %
3	Bottom DC(Plastika)		16 %
5	Qweak GEM Detector		6 %

40% [math]\pm[/math] 2%

3550/3250

• run number is 1366

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100 %
4	Top DC(Metalica)		5 %
3	Bottom DC(Plastika)		11 %
5	Qweak GEM Detector		6 %

• run number 1377

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100 %
4	Top DC(Metalica)		6 %
3	Bottom DC(Plastika)		16 %
5	Qweak GEM Detector		10%

68% [math]\pm[/math] 4%

3555/3255

• run number is 1373

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100 %
4	Top DC(Metalica)		6 %
3	Bottom DC(Plastika)		14 %
5	Qweak GEM Detector		10 %

• run number 1381 && 1382

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100 %
4	Top DC(Metalica)		6.6%
3	Bottom DC(Plastika)		15 %
5	Qweak GEM Detector		10 %

3560/3260

• run number is 1370

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100 %
4	Top DC(Metalica)		6%
3	Bottom DC(Plastika)		14%
5	Qweak GEM Detector		17 %

• run number is 1378

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100 %
4	Top DC(Metalica)		7%
3	Bottom DC(Plastika)		16%
5	Qweak GEM Detector		14 %

3575/3275

• run number is 1369

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100 %
4	Top DC(Metalica)		4 %
3	Bottom DC(Plastika)		15 %
5	Qweak GEM Detector		17 %

• run number 1379

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100 %
4	Top DC(Metalica)		5 %
3	Bottom DC(Plastika)		18 %
5	Qweak GEM Detector		20 %