2012AnnihCountrRateEstimate - Revision history

Setisadi: /* G4 Chromox description */

2012-02-02T17:43:29Z

G4 Chromox description

2012-02-02T17:34:16Z

Rates using GEANT4

2012-02-02T16:49:11Z

2 mm Thick Tungsten annihilation target

2012-02-02T16:48:07Z

Chromox

2012-02-02T16:44:52Z

Chromox target

2012-02-02T16:42:22Z

Chromox

2012-02-02T16:41:55Z

Chromox

2012-02-02T16:38:05Z

Chromox

2012-02-02T16:35:21Z

2 mm Thick Tungsten annihilation target

2012-02-02T16:35:10Z

2 mm Thick Tungsten annihilation target

@@ Line 69: / Line 69: @@
    //             and 0.5% made of  2 Cr and 3 O  Atoms/nuclei
    //
-   //   Al = 99.5 * 2/5 = 39.9 %
+   //   Al = 99.5 * 2/5 = 39.8 %
    //  O = 99.5 * 3/5 = 59.7 %
    //  O = 0.5 * 3/5 = 0.3 %
@@ Line 79: / Line 79: @@
    G4Material* ChroMox = new G4Material("ChroMox", density= 3.85*g/cm3, nel=3);
-   ChroMox->AddElement(Al, 40*perCent);
+   ChroMox->AddElement(Al, 30.8*perCent);
-   ChroMox->AddElement(O, 59.8*perCent);
+   ChroMox->AddElement(O, 60*perCent);
    ChroMox->AddElement(Cr, 0.2*perCent);

← Older revision		Revision as of 17:34, 2 February 2012
Line 86:		Line 86:

	==Rates using GEANT4==		==Rates using GEANT4==
		+
		+	Assume 3 MeV electron and positron beam.

	===2 mm Thick Tungsten annihilation target===		===2 mm Thick Tungsten annihilation target===

@@ Line 93: / Line 93: @@
 :<math>\frac{\mbox{Positrons}}{\mbox{electron}} = \frac{6768}{1367} = \frac{5}{1}</math>
-Integrating between 0.5 and 0.53 MeV (511 peak unclear)
+Integrating between 0.5 and 0.53 MeV
 :<math>\frac{\mbox{Positrons}}{\mbox{electron}} = \frac{2685}{120} = \frac{22}{1}</math>

← Older revision		Revision as of 16:48, 2 February 2012
Line 106:		Line 106:


−	Integrating between 0.5 and 0.53 MeV ~~(511 peak unclear)~~	+	Integrating between 0.5 and 0.53 MeV

	:<math>\frac{\mbox{Positrons}}{\mbox{electron}} = \frac{1094}{8.4} = \frac{130}{1}</math>		:<math>\frac{\mbox{Positrons}}{\mbox{electron}} = \frac{1094}{8.4} = \frac{130}{1}</math>

← Older revision		Revision as of 16:44, 2 February 2012
Line 53:		Line 53:

	[[File:Chromox_datasheet_CERN.pdf]]		[[File:Chromox_datasheet_CERN.pdf]]
		+
		+	====G4 Chromox description====
		+	<pre>
		+	G4Element* Cr =
		+	new G4Element("Chromium", "Cr",z=24., a= 51.9961*g/mole);
		+
		+	G4Element* Al =
		+	new G4Element("Aluminum","Al", z=13., a= 26.98154*g/mole);
		+
		+
		+	//
		+	// typically the viewers are 99.5% Al_2 O_3 and 0.5% Cr_2 O_3
		+	//
		+	// I will construct a material that is 99.5% made of 2 Al and 3 O Atoms/nuclei
		+	// and 0.5% made of 2 Cr and 3 O Atoms/nuclei
		+	//
		+	// Al = 99.5 * 2/5 = 39.9 %
		+	// O = 99.5 * 3/5 = 59.7 %
		+	// O = 0.5 * 3/5 = 0.3 %
		+	// Cr = 0.5 * 2/5 = 0.2%
		+	//
		+	// Jlab PePPo Chromox viewer is 0.011" thick = 0.279 mm
		+	//
		+	//
		+
		+	G4Material* ChroMox = new G4Material("ChroMox", density= 3.85*g/cm3, nel=3);
		+	ChroMox->AddElement(Al, 40*perCent);
		+	ChroMox->AddElement(O, 59.8*perCent);
		+	ChroMox->AddElement(Cr, 0.2*perCent);
		+
		+	</pre>

	==Rates using GEANT4==		==Rates using GEANT4==

← Older revision		Revision as of 16:42, 2 February 2012
Line 72:		Line 72:
	===Chromox===		===Chromox===

−	The photon rates predicted by GEANT4 when electrons and positrons interact with the ChroMox target and enter one of the NaI detectors ~~haing~~ a solid angle of (0.27 strad)	+	The photon rates predicted by GEANT4 when electrons and positrons interact with the ChroMox target and enter one of the NaI detectors having a solid angle of (0.27 strad)

← Older revision		Revision as of 16:41, 2 February 2012
Line 74:		Line 74:
	The photon rates predicted by GEANT4 when electrons and positrons interact with the ChroMox target and enter one of the NaI detectors haing a solid angle of (0.27 strad)		The photon rates predicted by GEANT4 when electrons and positrons interact with the ChroMox target and enter one of the NaI detectors haing a solid angle of (0.27 strad)

−	Integrating	+
		+	Integrating between 0.5 and 0.53 MeV (511 peak unclear)
		+
		+	:<math>\frac{\mbox{Positrons}}{\mbox{electron}} = \frac{1094}{8.4} = \frac{130}{1}</math>
		+

← Older revision		Revision as of 16:38, 2 February 2012
Line 71:		Line 71:

	===Chromox===		===Chromox===
−	~~The photon rates produced when electrons and positrons interact with the ChroMox target and enter one of the NaI detectors haing a solid angle of (0.27 strad)~~

		+	The photon rates predicted by GEANT4 when electrons and positrons interact with the ChroMox target and enter one of the NaI detectors haing a solid angle of (0.27 strad)
		+
		+	Integrating

−	~~The photon rates predicted by GEANT4 when electrons and positrons interact with the ChroMox target and enter one of the NaI detectors haing a solid angle of (0.27 strad)~~

	[[Image:G4AnihCountrRates_01252012.png \| 200px]]		[[Image:G4AnihCountrRates_01252012.png \| 200px]]

@@ Line 66: / Line 66: @@
 :<math>\frac{\mbox{Positrons}}{\mbox{electron}} = \frac{2685}{120} = \frac{22}{1}</math>
-:Experiment at IAC had <math>\frac{12}{1}</math>
+;Experiment at IAC had <math>\frac{12}{1}</math>
 [[Image:G4AnihCountrRates_02022012.png | 200px]]