Beta Transmission and Ionization - Revision history

Foretony: /* Primary and secondary ionization */

2015-04-21T23:06:39Z

Primary and secondary ionization

Foretony: /* Primary and secondary ionization */

2015-04-21T23:04:49Z

Primary and secondary ionization

Abdehait at 03:54, 20 April 2015

2015-04-20T03:54:35Z

Abdehait: /* Primary and secondary ionization */

2015-04-18T22:33:39Z

Primary and secondary ionization

Abdehait: /* Primary and secondary ionization */

2015-04-18T22:32:03Z

Primary and secondary ionization

Foretony: /* Primary and secondary ionization */

2015-04-16T22:30:40Z

Primary and secondary ionization

Foretony: /* Primary and secondary ionization */

2015-04-16T22:30:06Z

Primary and secondary ionization

Foretony: /* Primary and secondary ionization */

2015-04-16T22:29:32Z

Primary and secondary ionization

Abdehait: /* Primary and secondary ionization */

2015-04-09T19:10:58Z

Primary and secondary ionization

Abdehait: /* Primary and secondary ionization */

2015-04-09T18:47:19Z

Primary and secondary ionization

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   What is GEANT4 cut that produces 1000 primary ionization.
-;The file Em10PhysicsList.cc in GEANT4 on  line 111 the range cut is set to 0.03 mm which will stop tracking electrons whose mean free path is less than 0.03 mm.  GEANT4 predicts 10^3 primary ionization events for a 100 keV electron traversing a 90/10 mixture of ArCo2 followed by 3 \times 10^2 secondary ionization events.
+;The range cut on line 111 in the GEANT4 file Em10PhysicsList.cc is set to 0.03 mm to prevent the tracking electrons whose mean free path is less than 0.03 mm.  GEANT4 predicts 10^3 primary ionization events for a 100 keV electron traversing a 90/10 mixture of ArCo2 followed by 3 \times 10^2 secondary ionization events.
   Why is Garfield only getting 30

← Older revision		Revision as of 23:04, 21 April 2015
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	What is GEANT4 cut that produces 1000 primary ionization.		What is GEANT4 cut that produces 1000 primary ionization.
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		+	;The file Em10PhysicsList.cc in GEANT4 on line 111 the range cut is set to 0.03 mm which will stop tracking electrons whose mean free path is less than 0.03 mm. GEANT4 predicts 10^3 primary ionization events for a 100 keV electron traversing a 90/10 mixture of ArCo2 followed by 3 \times 10^2 secondary ionization events.

	Why is Garfield only getting 30		Why is Garfield only getting 30

← Older revision		Revision as of 03:54, 20 April 2015
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	[[ HAM_Beta_extras]]		[[ HAM_Beta_extras]]
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		+	GO BACK [https://wiki.iac.isu.edu/index.php/Performance_of_THGEM_as_a_Neutron_Detector#Simulation_and_Analysis]

@@ Line 25: / Line 25: @@
    Why is e-star only getting 200
-G4 cut is in Em10PhysicsList.cc,  line 111, and it is a length cut, to have 10^3 primaries and 3x10^3 secondaries, the cut = 0.03 mm .
+G4 cut is in Em10PhysicsList.cc,  line 111, and it is a length cut, to have 10^3 primaries and 3x10^3 secondaries, range cut = 0.03 mm . which means to track to zero electrons of range of 0.03 mm.
 = Beta Ionization with FR4 shutter=

← Older revision		Revision as of 22:32, 18 April 2015
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	Why is e-star only getting 200		Why is e-star only getting 200
		+
		+	G4 cut is in Em10PhysicsList.cc, line 111, and it is a length cut, to have 10^3 primaries and 3x10^3 secondaries, the cut = 0.03 mm .

	= Beta Ionization with FR4 shutter=		= Beta Ionization with FR4 shutter=

← Older revision		Revision as of 22:30, 16 April 2015
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	What is GEANT4 cut that produces 1000 primary ionization.		What is GEANT4 cut that produces 1000 primary ionization.
		+
		+	Why is Garfield only getting 30
		+
		+	Why is e-star only getting 200

	= Beta Ionization with FR4 shutter=		= Beta Ionization with FR4 shutter=

@@ Line 16: / Line 16: @@
 Leo: 1 e-ion pair per 30 eV of energy loss , a 100 keV electron loosing all of its energy to ionization produces 3333 e-ion pairs
 Sauli: a 100 keV electron causes 1000 e-ion pairs per cm and 3000 secondary e-ion pairs.
 = Beta Ionization with FR4 shutter=

← Older revision		Revision as of 22:29, 16 April 2015
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	[[File: G4_1cmAr90CO2_Beta_primaryElecN.png\| 300 px]][http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1967ApJS...14..207L&db_key=AST&page_ind=0&plate_select=NO&data_type=GIF&type=SCREEN_GIF&classic=YES]		[[File: G4_1cmAr90CO2_Beta_primaryElecN.png\| 300 px]][http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1967ApJS...14..207L&db_key=AST&page_ind=0&plate_select=NO&data_type=GIF&type=SCREEN_GIF&classic=YES]
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		+
		+	Leo: 1 e-ion pair per 30 eV of energy loss , a 100 keV electron loosing all of its energy to ionization produces 3333 e-ion pairs
		+	Sauli: a 100 keV electron causes 1000 e-ion pairs per cm and 3000 secondary e-ion pairs.

	= Beta Ionization with FR4 shutter=		= Beta Ionization with FR4 shutter=

@@ Line 10: / Line 10: @@
 =Primary and secondary ionization=
-A simulation for Beta ionization was performed by using GEANT4. GEANT4 simulated the interaction of a beta particle in the drift region that contained 90/10 Ar/CO2 gas; the simulation estimated the ionization primary and secondary electrons. Figure XX illustrates that the number of primary electrons is inversely proportional to the incident beta particle energy; such a relationship agrees with Bethe-Bloch equation for estimating the energy loss. The figure also shows
+A simulation for Beta ionization was performed by using GEANT4. GEANT4 simulated the interaction of a beta particle in the drift region that contained 90/10 Ar/CO2 gas; the simulation estimated the ionization primary and secondary electrons. Figure XX illustrates that the number of primary electrons is inversely proportional to the incident beta particle energy; such a relationship agrees with Bethe-Bloch equation for estimating the energy loss. The figure also shows GEANT4 underestimation for the number of primaries when for beta particle of energy of 10 keV, and when the energy is higher than 300 keV; one of the reasons that GEANT4 does not consider the minimum ionization for an ion-electron for Ar/CO2 or miscalculate it, or the electron cut is still high that makes it hard to track the low energy electrons. On the other hand, Garfield simulation for the number of electrons in the drift region when a beta particle passes through, and agreed with Bethe-Bloch formula, so the highest number of primaries is for low energy betas.Additionally, the number of primaries decreases gradually as beta energy increases to reach to the minimum ionization for Ar/CO2 gas which is in average 24 eV.
 [[File: G4_1cmAr90CO2_Beta_primaryElecN.png| 300 px]][http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1967ApJS...14..207L&db_key=AST&page_ind=0&plate_select=NO&data_type=GIF&type=SCREEN_GIF&classic=YES]