Runs 4111(D2O)/4112(H2O) - Revision history

Kosiolek: /* Neutron energy analysis */

2012-10-04T15:35:43Z

Neutron energy analysis

Kosiolek: /* Neutron energy analysis */

2012-10-04T15:27:19Z

Neutron energy analysis

Kosiolek: /* Neutron energy analysis */

2012-10-04T15:26:53Z

Neutron energy analysis

Kosiolek: /* Neutron energy analysis */

2012-10-04T15:25:34Z

Neutron energy analysis

Kosiolek: /* Neutron energy analysis */

2012-10-03T23:54:03Z

Neutron energy analysis

Kosiolek: /* Neutron energy analysis */

2012-10-03T23:52:45Z

Neutron energy analysis

Kosiolek: /* Neutron energy analysis */

2012-10-03T23:50:54Z

Neutron energy analysis

Kosiolek: /* Neutron energy analysis */

2012-10-03T23:49:47Z

Neutron energy analysis

Kosiolek: /* Neutron energy analysis */

2012-10-03T23:32:14Z

Neutron energy analysis

Kosiolek: /* Neutron energy analysis */

2012-10-03T23:31:03Z

Neutron energy analysis

← Older revision		Revision as of 15:35, 4 October 2012
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	[[File:DetM_Calibr_data_mis_nCut.png]]		[[File:DetM_Calibr_data_mis_nCut.png]]
		+
		+
		+	If we take into account only photon region, we'll get
		+
		+
		+	[[File:DetM_Calibr_data_mis_gCut.png]]
		+

	Neutron ToF to the surface of the detector can be calculated as <math>t_n = 0.5 \cdot ((TDC_{left}+TDC_{right})-ToF_{sint+lg})</math>, where <math>ToF_{sint+lg}</math> is the total light ToF inside the detector and it was taken to be a const <math>ToF_{sint+lg} = 100cm \cdot \frac{1}{2.5 cm/ns} \simeq 40 ns</math>. So, the neutron ToF can be calculated as <math>t_n = 0.5 \cdot ((TDC_{left}+TDC_{right})-40)</math>		Neutron ToF to the surface of the detector can be calculated as <math>t_n = 0.5 \cdot ((TDC_{left}+TDC_{right})-ToF_{sint+lg})</math>, where <math>ToF_{sint+lg}</math> is the total light ToF inside the detector and it was taken to be a const <math>ToF_{sint+lg} = 100cm \cdot \frac{1}{2.5 cm/ns} \simeq 40 ns</math>. So, the neutron ToF can be calculated as <math>t_n = 0.5 \cdot ((TDC_{left}+TDC_{right})-40)</math>

← Older revision		Revision as of 15:27, 4 October 2012
Line 50:		Line 50:


−	However, there is a question on how to define the uncertainty on the coefficient <math>R</math>. Calibration <math>R_{calibr}</math> does not correspond to the measured one <math>R_{data}</math> (measured w/ Co-60 source). As an example for Det M we have(~~neutron~~ and photons together):	+	However, there is a question on how to define the uncertainty on the coefficient <math>R</math>. Calibration <math>R_{calibr}</math> does not correspond to the measured one <math>R_{data}</math> (measured w/ Co-60 source). As an example for Det M we have (neutrons and photons combined together):

	[[File:DetM_Calibr_data_mis.png]]		[[File:DetM_Calibr_data_mis.png]]

@@ Line 48: / Line 48: @@
 The neutron flight path length was calculated using the following expression: <math>l_n = \sqrt{l_c^2 + (X_c-X_i)^2}</math>, where <math>X_c=75/2=37.5cm</math> is the coordinate of the middle of the neutron detector active area and <math>X_i</math> is the current x-coordinate extracted from time difference spectrum. <math>l_c</math> is the distance from the middle of the target to the middle of the neutron detector surface. The current coordinate can be defined as <math>X_i = (((TDC_{left}-TDC_{right}) \cdot 0.223 ns/ch) \pm S) \cdot R</math>, where <math>S</math> is a shift factor due to the difference in delays for the two channels and should be taken to be the lowest value in <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum. The coefficient <math>R</math> is equal to active area dimension divided by the total width of <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum measured at base,i.e. <math>R = \frac{ 75(cm)}{abs(MAX[(TDC_{left}-TDC_{right})(ch) \cdot 0.223(ns/ch)]-MIN[(TDC_{left}-TDC_{right})(ch) \cdot 0.223(ns/ch)])} </math> or it can be measured by moving a radioactive source along the neutron detector surface.
 However, there is a question on how to define the uncertainty on the coefficient <math>R</math>. Calibration <math>R_{calibr}</math> does not correspond to the measured one <math>R_{data}</math> (measured w/ Co-60 source). As an example for Det M we have:
 [[File:DetM_Calibr_data_mis.png]]

← Older revision		Revision as of 15:25, 4 October 2012
Line 52:		Line 52:
	[[File:DetM_Calibr_data_mis.png]]		[[File:DetM_Calibr_data_mis.png]]

		+	If we take into account only neutron region, we'll get
		+
		+
		+	[[File:DetM_Calibr_data_mis_nCut.png]]

	Neutron ToF to the surface of the detector can be calculated as <math>t_n = 0.5 \cdot ((TDC_{left}+TDC_{right})-ToF_{sint+lg})</math>, where <math>ToF_{sint+lg}</math> is the total light ToF inside the detector and it was taken to be a const <math>ToF_{sint+lg} = 100cm \cdot \frac{1}{2.5 cm/ns} \simeq 40 ns</math>. So, the neutron ToF can be calculated as <math>t_n = 0.5 \cdot ((TDC_{left}+TDC_{right})-40)</math>		Neutron ToF to the surface of the detector can be calculated as <math>t_n = 0.5 \cdot ((TDC_{left}+TDC_{right})-ToF_{sint+lg})</math>, where <math>ToF_{sint+lg}</math> is the total light ToF inside the detector and it was taken to be a const <math>ToF_{sint+lg} = 100cm \cdot \frac{1}{2.5 cm/ns} \simeq 40 ns</math>. So, the neutron ToF can be calculated as <math>t_n = 0.5 \cdot ((TDC_{left}+TDC_{right})-40)</math>

@@ Line 48: / Line 48: @@
 The neutron flight path length was calculated using the following expression: <math>l_n = \sqrt{l_c^2 + (X_c-X_i)^2}</math>, where <math>X_c=75/2=37.5cm</math> is the coordinate of the middle of the neutron detector active area and <math>X_i</math> is the current x-coordinate extracted from time difference spectrum. <math>l_c</math> is the distance from the middle of the target to the middle of the neutron detector surface. The current coordinate can be defined as <math>X_i = (((TDC_{left}-TDC_{right}) \cdot 0.223 ns/ch) \pm S) \cdot R</math>, where <math>S</math> is a shift factor due to the difference in delays for the two channels and should be taken to be the lowest value in <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum. The coefficient <math>R</math> is equal to active area dimension divided by the total width of <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum measured at base,i.e. <math>R = \frac{ 75(cm)}{abs(MAX[(TDC_{left}-TDC_{right})(ch) \cdot 0.223(ns/ch)]-MIN[(TDC_{left}-TDC_{right})(ch) \cdot 0.223(ns/ch)])} </math> or it can be measured by moving a radioactive source along the neutron detector surface.
-However, there is a question on how to define the uncertainty on the coefficient <math>R</math>. Calibration <math>R_{calibr}</math> does not correspond to measured one <math>R_{data}</math>. As an example for Det M we have:
+However, there is a question on how to define the uncertainty on the coefficient <math>R</math>. Calibration <math>R_{calibr}</math> does not correspond to the measured one <math>R_{data}</math> (measured w/ Co-60 source). As an example for Det M we have:
 [[File:DetM_Calibr_data_mis.png]]

@@ Line 46: / Line 46: @@
 Where uncertainty in the neutron flight pass due to the finite width of the detector <math>U(l_n)</math> was simulated using GEANT4 and uncertainty in zero time definition in neutron TOF spectrum <math>U(t_n)</math> was defined from the experimental data as sigma of the zero time photon peak.
-The neutron flight path length was calculated using the following expression: <math>l_n = \sqrt{l_c^2 + (X_c-X_i)^2}</math>, where <math>X_c=75/2=37.5cm</math> is the coordinate of the middle of the neutron detector active area and <math>X_i</math> is the current x-coordinate extracted from time difference spectrum. <math>l_c</math> is the distance from the middle of the target to the middle of the neutron detector surface. The current coordinate can be defined as <math>X_i = (((TDC_{left}-TDC_{right}) \cdot 0.223 ns/ch) \pm S) \cdot R</math>, where <math>S</math> is a shift factor due to the difference in delays for the two channels and should be taken to be the lowest value in <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum. The coefficient <math>R</math> is equal to active area dimension divided by the total width of <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum measured at base,i.e. <math>R = \frac{ 75(cm)}{MAX[(TDC_{left}-TDC_{right})(ch) \cdot 0.223(ns/ch)]-MIN[(TDC_{left}-TDC_{right})(ch) \cdot 0.223(ns/ch)]} </math> or it can be measured by moving a radioactive source along the neutron detector surface.
+The neutron flight path length was calculated using the following expression: <math>l_n = \sqrt{l_c^2 + (X_c-X_i)^2}</math>, where <math>X_c=75/2=37.5cm</math> is the coordinate of the middle of the neutron detector active area and <math>X_i</math> is the current x-coordinate extracted from time difference spectrum. <math>l_c</math> is the distance from the middle of the target to the middle of the neutron detector surface. The current coordinate can be defined as <math>X_i = (((TDC_{left}-TDC_{right}) \cdot 0.223 ns/ch) \pm S) \cdot R</math>, where <math>S</math> is a shift factor due to the difference in delays for the two channels and should be taken to be the lowest value in <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum. The coefficient <math>R</math> is equal to active area dimension divided by the total width of <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum measured at base,i.e. <math>R = \frac{ 75(cm)}{abs(MAX[(TDC_{left}-TDC_{right})(ch) \cdot 0.223(ns/ch)]-MIN[(TDC_{left}-TDC_{right})(ch) \cdot 0.223(ns/ch)])} </math> or it can be measured by moving a radioactive source along the neutron detector surface.
 However, there is a question on how to define the uncertainty on the coefficient <math>R</math>. Calibration <math>R_{calibr}</math> does not correspond to measured one <math>R_{data}</math>. As an example for Det M we have:

← Older revision		Revision as of 23:49, 3 October 2012
Line 48:		Line 48:
	The neutron flight path length was calculated using the following expression: <math>l_n = \sqrt{l_c^2 + (X_c-X_i)^2}</math>, where <math>X_c=75/2=37.5cm</math> is the coordinate of the middle of the neutron detector active area and <math>X_i</math> is the current x-coordinate extracted from time difference spectrum. <math>l_c</math> is the distance from the middle of the target to the middle of the neutron detector surface. The current coordinate can be defined as <math>X_i = (((TDC_{left}-TDC_{right}) \cdot 0.223 ns/ch) \pm S) \cdot R</math>, where <math>S</math> is a shift factor due to the difference in delays for the two channels and should be taken to be the lowest value in <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum. The coefficient <math>R</math> is equal to active area dimension divided by the total width of <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum measured at base,i.e. <math>R = \frac{ 75(cm)}{MAX[(TDC_{left}-TDC_{right})(ch) \cdot 0.223(ns/ch)]-MIN[(TDC_{left}-TDC_{right})(ch) \cdot 0.223(ns/ch)]} </math> or it can be measured by moving a radioactive source along the neutron detector surface.		The neutron flight path length was calculated using the following expression: <math>l_n = \sqrt{l_c^2 + (X_c-X_i)^2}</math>, where <math>X_c=75/2=37.5cm</math> is the coordinate of the middle of the neutron detector active area and <math>X_i</math> is the current x-coordinate extracted from time difference spectrum. <math>l_c</math> is the distance from the middle of the target to the middle of the neutron detector surface. The current coordinate can be defined as <math>X_i = (((TDC_{left}-TDC_{right}) \cdot 0.223 ns/ch) \pm S) \cdot R</math>, where <math>S</math> is a shift factor due to the difference in delays for the two channels and should be taken to be the lowest value in <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum. The coefficient <math>R</math> is equal to active area dimension divided by the total width of <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum measured at base,i.e. <math>R = \frac{ 75(cm)}{MAX[(TDC_{left}-TDC_{right})(ch) \cdot 0.223(ns/ch)]-MIN[(TDC_{left}-TDC_{right})(ch) \cdot 0.223(ns/ch)]} </math> or it can be measured by moving a radioactive source along the neutron detector surface.

		+	However, there is a question on how to define the uncertainty on the coefficient <math>R</math>. Calibration <math>R_calibr</math> does not correspond to measured one. As an example for Det M we have:
		+
		+	[[File:DetM_Calibr_data_mis.png]]

← Older revision		Revision as of 23:32, 3 October 2012
Line 46:		Line 46:
	Where uncertainty in the neutron flight pass due to the finite width of the detector <math>U(l_n)</math> was simulated using GEANT4 and uncertainty in zero time definition in neutron TOF spectrum <math>U(t_n)</math> was defined from the experimental data as sigma of the zero time photon peak.		Where uncertainty in the neutron flight pass due to the finite width of the detector <math>U(l_n)</math> was simulated using GEANT4 and uncertainty in zero time definition in neutron TOF spectrum <math>U(t_n)</math> was defined from the experimental data as sigma of the zero time photon peak.

−	The neutron flight path length was calculated using the following expression: <math>l_n = \sqrt{l_c^2 + (X_c-X_i)^2}</math>, where <math>X_c=75/2=37.5cm</math> is the coordinate of the middle of the neutron detector active area and <math>X_i</math> is the current x-coordinate extracted from time difference spectrum. <math>l_c</math> is the distance from the middle of the target to the middle of the neutron detector surface. The current coordinate can be defined as <math>X_i = (((TDC_{left}-TDC_{right}) \cdot 0.223 ns/ch) \pm S) \cdot R</math>, where <math>S</math> is a shift factor due to the difference in delays for the two channels and should be taken to be the lowest value in <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum. The coefficient <math>R</math> is equal to active area dimension divided by the total width of <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum measured at base,i.e. <math>R = \frac{ 75(cm)}{(TDC_{left}-TDC_{right})(ch) \cdot 0.223(ns/ch)} </math> or it can be measured by moving a radioactive source along the neutron detector surface.	+	The neutron flight path length was calculated using the following expression: <math>l_n = \sqrt{l_c^2 + (X_c-X_i)^2}</math>, where <math>X_c=75/2=37.5cm</math> is the coordinate of the middle of the neutron detector active area and <math>X_i</math> is the current x-coordinate extracted from time difference spectrum. <math>l_c</math> is the distance from the middle of the target to the middle of the neutron detector surface. The current coordinate can be defined as <math>X_i = (((TDC_{left}-TDC_{right}) \cdot 0.223 ns/ch) \pm S) \cdot R</math>, where <math>S</math> is a shift factor due to the difference in delays for the two channels and should be taken to be the lowest value in <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum. The coefficient <math>R</math> is equal to active area dimension divided by the total width of <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum measured at base,i.e. <math>R = \frac{ 75(cm)}{MAX[(TDC_{left}-TDC_{right})(ch) \cdot 0.223(ns/ch)]-MIN[(TDC_{left}-TDC_{right})(ch) \cdot 0.223(ns/ch)]} </math> or it can be measured by moving a radioactive source along the neutron detector surface.

@@ Line 46: / Line 46: @@
 Where uncertainty in the neutron flight pass due to the finite width of the detector <math>U(l_n)</math> was simulated using GEANT4 and uncertainty in zero time definition in neutron TOF spectrum <math>U(t_n)</math> was defined from the experimental data as sigma of the zero time photon peak.
-The neutron flight path length was calculated using the following expression: <math>l_n = \sqrt{l_c^2 + (X_c-X_i)^2}</math>, where <math>X_c=75/2=37.5cm</math> is the coordinate of the middle of the neutron detector active area and <math>X_i</math> is the current x-coordinate extracted from time difference spectrum. <math>l_c</math> is the distance from the middle of the target to the middle of the neutron detector surface. The current coordinate can be defined as <math>X_i = (((TDC_{left}-TDC_{right}) \cdot 0.223 ns/ch) \pm S) \cdot R</math>, where <math>S</math> is a shift factor due to the difference in delays for the two channels and should be taken to be the lowest value in <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum. The coefficient <math>R</math> is equal to active area dimension divided by the total width of <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum measured at base,i.e. <math>R = \frac{ 75(cm)}{(TDC_{left}-TDC_{right})(ch) \cdot 0.223(ns/ch)} </math>
+The neutron flight path length was calculated using the following expression: <math>l_n = \sqrt{l_c^2 + (X_c-X_i)^2}</math>, where <math>X_c=75/2=37.5cm</math> is the coordinate of the middle of the neutron detector active area and <math>X_i</math> is the current x-coordinate extracted from time difference spectrum. <math>l_c</math> is the distance from the middle of the target to the middle of the neutron detector surface. The current coordinate can be defined as <math>X_i = (((TDC_{left}-TDC_{right}) \cdot 0.223 ns/ch) \pm S) \cdot R</math>, where <math>S</math> is a shift factor due to the difference in delays for the two channels and should be taken to be the lowest value in <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum. The coefficient <math>R</math> is equal to active area dimension divided by the total width of <math>(TDC_{left}-TDC_{right}) \cdot 0.223</math> spectrum measured at base,i.e. <math>R = \frac{ 75(cm)}{(TDC_{left}-TDC_{right})(ch) \cdot 0.223(ns/ch)} </math> or it can be measured by moving a radioactive source along the neutron detector surface.
 Neutron ToF to the surface of the detector can be calculated as <math>t_n = 0.5 \cdot ((TDC_{left}+TDC_{right})-ToF_{sint+lg})</math>, where <math>ToF_{sint+lg}</math> is the total light ToF inside the detector and it was taken to be a const <math>ToF_{sint+lg} = 100cm \cdot \frac{1}{2.5 cm/ns} \simeq 40 ns</math>. So, the neutron ToF can be calculated as <math>t_n = 0.5 \cdot ((TDC_{left}+TDC_{right})-40)</math>