LB January Flux Simulations - Revision history

Brenleyt: /* 1.5 cm Diam beam */

2018-02-26T17:06:09Z

1.5 cm Diam beam

← Older revision		Revision as of 17:06, 26 February 2018
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	For a 1.5cm diameter beam I was able to find a place on the nickel foil that had half as much flux as the selenium. Below is a plot of the selenium flux with both fine bins and coarse bins		For a 1.5cm diameter beam I was able to find a place on the nickel foil that had half as much flux as the selenium. Below is a plot of the selenium flux with both fine bins and coarse bins

			[[File:LB SeleniumFlux G4Sim 1.5cmBeam FullViewFineBins Jan2018.png\|200px]]

	[[File:LB SeFluxPlot FullView 1.5cmBeam Jan2018.png\|200px]]		[[File:LB SeFluxPlot FullView 1.5cmBeam Jan2018.png\|200px]]

Brenleyt: /* 1.5 cm Diam beam */

2018-02-26T16:49:26Z

1.5 cm Diam beam

← Older revision		Revision as of 16:49, 26 February 2018
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	==1.5 cm Diam beam==		==1.5 cm Diam beam==
	Below is a more finely binned histogram so a better flux profile can be seen:		Below is a more finely binned histogram so a better flux profile can be seen:

	[[File:LB NickelFlux G4Sim 1.5cmBeam FullViewFineBins Jan2018.png\|200px]]		[[File:LB NickelFlux G4Sim 1.5cmBeam FullViewFineBins Jan2018.png\|200px]]

	For a 1.5cm diameter beam I was able to find a place on the nickel foil that had half as much flux as the selenium. Below is a plot of the selenium flux		For a 1.5cm diameter beam I was able to find a place on the nickel foil that had half as much flux as the selenium. Below is a plot of the selenium flux with both fine bins and coarse bins



	[[File:LB SeFluxPlot FullView 1.5cmBeam Jan2018.png\|200px]]		[[File:LB SeFluxPlot FullView 1.5cmBeam Jan2018.png\|200px]]

Brenleyt: /* 1.5 cm Diam beam */

2018-02-26T16:48:59Z

1.5 cm Diam beam

← Older revision		Revision as of 16:48, 26 February 2018
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	==1.5 cm Diam beam==		==1.5 cm Diam beam==
			Below is a more finely binned histogram so a better flux profile can be seen:
			[[File:LB NickelFlux G4Sim 1.5cmBeam FullViewFineBins Jan2018.png\|200px]]

	For a 1.5cm diameter beam I was able to find a place on the nickel foil that had half as much flux as the selenium. Below is a plot of the selenium flux		For a 1.5cm diameter beam I was able to find a place on the nickel foil that had half as much flux as the selenium. Below is a plot of the selenium flux

Brenleyt: /* 1.5 cm Diam beam */

2018-02-26T16:40:29Z

1.5 cm Diam beam

← Older revision		Revision as of 16:40, 26 February 2018
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	[[File:LB NickelFlux G4Sim 1.5cmBeam FullView Jan2018.png\|200px]]		[[File:LB NickelFlux G4Sim 1.5cmBeam FullView Jan2018.png\|200px]]

			From here we can see that the flux is half from the center at the bottom of the foil and from <math>\pm</math>10-15mm in the x position

Brenleyt: /* 1.5 cm Diam beam */

2018-02-26T16:39:13Z

1.5 cm Diam beam

← Older revision		Revision as of 16:39, 26 February 2018
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	<math> \frac{10309}{19207} = 0.54 </math>		<math> \frac{10309}{19207} = 0.54 </math>

			We can also simply look at the nickel foil flux and find a region where the flux would be half as much. Below is a plot of the nickel foil

			[[File:LB NickelFlux G4Sim 1.5cmBeam FullView Jan2018.png\|200px]]

Foretony at 19:23, 25 January 2018

2018-01-25T19:23:46Z

← Older revision		Revision as of 19:23, 25 January 2018
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			=Simulation Geometry=
	Simulations were run using geant4 to try and see if the ratio of the flux between the nickel foil and the inner selenium pellet would explain why the ratios of the rates are not correct. A general particle source was used to fire electrons in a beam at a titanium beam window, which then proceeds to an aluminum/tungsten radiator. After that the particles will encounter a nickel foil followed by an aluminum sheet and finally a selenium pellet that is -0.75cm off of the beam axis (to try and replicate the location of the foil relative to the selenium pellet). The run.mac file is shown below		Simulations were run using geant4 to try and see if the ratio of the flux between the nickel foil and the inner selenium pellet would explain why the ratios of the rates are not correct. A general particle source was used to fire electrons in a beam at a titanium beam window, which then proceeds to an aluminum/tungsten radiator. After that the particles will encounter a nickel foil followed by an aluminum sheet and finally a selenium pellet that is -0.75cm off of the beam axis (to try and replicate the location of the foil relative to the selenium pellet). The run.mac file is shown below

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	[[File:LB JanFluxSim SideView.png\|200px]]		[[File:LB JanFluxSim SideView.png\|200px]]
	[[File:LB JanFluxSim RotatedView.png\|200px]]		[[File:LB JanFluxSim RotatedView.png\|200px]]

			=Results=

	==2.5 cm diam electron beam==		==2.5 cm diam electron beam==

Foretony at 19:23, 25 January 2018

2018-01-25T19:23:16Z

← Older revision		Revision as of 19:23, 25 January 2018
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	[[File:LB JanFluxSim RotatedView.png\|200px]]		[[File:LB JanFluxSim RotatedView.png\|200px]]

			==2.5 cm diam electron beam==
	Below are the flux plots as a function of position for the nickel foil and the selenium pellet using a 2.5cm beam diameter.		Below are the flux plots as a function of position for the nickel foil and the selenium pellet using a 2.5cm beam diameter.

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	It could be feasible that with a 2.5cm diameter beam that if the pellet were centered at 1.5cm off beam axis in the x direction, then the flux would be half.		It could be feasible that with a 2.5cm diameter beam that if the pellet were centered at 1.5cm off beam axis in the x direction, then the flux would be half.

			==1.5 cm Diam beam==
	For a 1.5cm diameter beam I was able to find a place on the nickel foil that had half as much flux as the selenium. Below is a plot of the selenium flux		For a 1.5cm diameter beam I was able to find a place on the nickel foil that had half as much flux as the selenium. Below is a plot of the selenium flux

Brenleyt at 18:28, 25 January 2018

2018-01-25T18:28:43Z

← Older revision		Revision as of 18:28, 25 January 2018
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	[[File:LB SeFlux G4Sim FullView Jan2018.png\|200px]]		[[File:LB SeFlux G4Sim FullView Jan2018.png\|200px]]

	Now try moving the target around until there is an area that has ~~twice~~ as much flux as the selenium pellet.		Now try moving the target around until there is an area that has half as much flux as the selenium pellet.

	[[File:LB NickelFlux G4Sim Jan2018.png\|200px]]		[[File:LB NickelFlux G4Sim Zoom 2.5cmBeam Jan2018.png\|200px]]
	[[File:LB SeFlux G4Sim Jan2018.png\|200px]]		[[File:LB SeFlux G4Sim Jan2018.png\|200px]]


	We can see here that the selenium pellet has 13620 counts in it, while the selected region of the nickel foil has ~~26980~~ counts. Taking the ratio gives 0.50.		We can see here that the selenium pellet has 13620 counts in it, while the selected region of the nickel foil has 6805 counts. Taking the ratio gives 0.50.

	~~If we are looking for~~ a ~~bin~~ that is the ~~size of the target that has twice~~ the ~~amount of counts~~, then ~~that was not found with this beam diameter, so I will try smaller diameter beams as well~~.		It could be feasible that with a 2.5cm diameter beam that if the pellet were centered at 1.5cm off beam axis in the x direction, then the flux would be half.

Brenleyt at 18:20, 25 January 2018

2018-01-25T18:20:11Z

← Older revision		Revision as of 18:20, 25 January 2018
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	/gps/position 0 0 -5 m		/gps/position 0 0 -5 m

	/gps/pos/type ~~Plane~~		/gps/pos/type Beam

	/gps/pos/shape Circle		/gps/pos/shape Circle

	/gps/pos/radius 0.5 cm		/gps/pos/radius 0.75 cm

	/tracking/verbose 2		/tracking/verbose 2
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	/gps/verbose 2		/gps/verbose 2

	/gps/pos/sigma_r 0.5 cm		/gps/pos/sigma_r 0.75 cm

	/gps/energy 32 MeV		/gps/energy 32 MeV

	/run/beamOn ~~50000~~		/run/beamOn 1000000

	The dimensions of the pieces of interest are:		The dimensions of the pieces of interest are:

Brenleyt at 18:19, 25 January 2018

2018-01-25T18:19:18Z

← Older revision		Revision as of 18:19, 25 January 2018
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	Note that this position on the nickel foil is still at the bottom of the Aluminum cylinder, similar to where the selenium would actually be due to the fact that there was not much ash in the cylinder to raise its position in y. It would seem that if the selenium pellet were centered off the x axis by 5mm, then it would be feasible that the flux through the selenium pellet would be half.		Note that this position on the nickel foil is still at the bottom of the Aluminum cylinder, similar to where the selenium would actually be due to the fact that there was not much ash in the cylinder to raise its position in y. It would seem that if the selenium pellet were centered off the x axis by 5mm, then it would be feasible that the flux through the selenium pellet would be half.

			The ratio of the number of photons through the selenium and the number of photons through the small area of the nickel is

			<math> \frac{10309}{19207} = 0.54 </math>