Niowave 1-2016 - Revision history

Foretony at 15:23, 13 April 2016

2016-04-13T15:23:10Z

Foretony at 15:22, 13 April 2016

2016-04-13T15:22:32Z

Foretony at 15:22, 13 April 2016

2016-04-13T15:22:21Z

Foretony at 15:20, 13 April 2016

2016-04-13T15:20:55Z

Foretony: Created page with " Question: Will a thicker downstream exit window increase the positron production efficiency by providing more material for a brehm photon to pair produce in? Positrons were c…"

2016-04-12T21:01:06Z

Created page with " Question: Will a thicker downstream exit window increase the positron production efficiency by providing more material for a brehm photon to pair produce in? Positrons were c…"

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Question: Will a thicker downstream exit window increase the positron production efficiency by providing more material for a brehm photon to pair produce in?

Positrons were counted exiting a ideal 0.2 Tesla solenoid that was 15 cm long. A ten MeV electron beam with a 0.5 cm cylindrical radius impinged a 2mm thick PbBi liquid target that had a surface area of 2.54 cm x 2.54 cm. A 0.25 mm thick stainless steel entrance window was used.

Target is at -106 mm, entrance SS window is at -108.25 mm , exit SS window is at -103.75 mm, A sensitive detector for positron is placed at Z= +44mm. The sensitive detector is a cylinder of radius 11.74 cm.

{| border="1"
{| border="1"
| SS Exit WIndow Thickness (mm) || Positrons/Million electrons
|-
|0.0 || 1142,1096,1149,1073,1083 = 1109 +/- 35
|-
| 0.25 || 774,836,800,785,798 = 798 +/- 23
|-
| 0.5 || 693,704,713,697,715 = 704 +/- 10
|-
| 1.0 || 587,606,548,592,550 =577 +/- 26
|+
|}

;Conclusion 1: Positron production efficiency improves when the exit window is made thinner

;Conclusion 2 : You loose about 28 +/- 4 % of the positrons in the 0.25 mm thick SS exit window.

@@ Line 5: / Line 5: @@
 {| border="1"
-| [[File:PositronRates-vs-SolenoidField_10-1-15.png |400px]]
+| [[File:PositronRates-vs-SolenoidField_10-1-15.png |600px]]
 |+ Positron Rates -vs- Solenoid Field for 2mm thick PbBi target and several Beam pipe diameters
 |}

@@ Line 5: / Line 5: @@
 {| border="1"
-| [[File:PositronRates-vs-SolenoidField_10-1-15.png |200px]]
+| [[File:PositronRates-vs-SolenoidField_10-1-15.png |400px]]
 |+ Positron Rates -vs- Solenoid Field for 2mm thick PbBi target and several Beam pipe diameters
 |}

← Older revision		Revision as of 15:22, 13 April 2016
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	Niowave Positron Project Progress for January 2016		Niowave Positron Project Progress for January 2016
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		+	The positron collection efficiency was investigated for several solenoidal magnetic field strengths and beam pipe radii to determine the impact of using a solenoidal field strength that was less than one Tesla. The figure below shows the number of positrons that exit the solenoid for every million electrons that impinge a 2mm thick PbBi target sandwiched between 0.25 mm thick stainless steel windows. If the solenoids field strength was limited to a maximum of 0.3 Tesla, then a 97.5 mm diameter beam pipe would have the same positron transport efficiency as a 1.0 Tesla field and a 34.8mm diameter beam pipe. Otherwise, the positron transport efficiency can increase by a factor of two when using a 34.8 mm diameter beam pipe if the solenoidal field strength is increased from 0.3 Tesla to 1.0 Tesla.
		+
		+
		+	{\| border="1"
		+	\| [[File:PositronRates-vs-SolenoidField_10-1-15.png \|200px]]
		+	\|+ Positron Rates -vs- Solenoid Field for 2mm thick PbBi target and several Beam pipe diameters
		+	\|}

← Older revision		Revision as of 15:20, 13 April 2016
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		+	Niowave Positron Project Progress for January 2016
		+

	Question: Will a thicker downstream exit window increase the positron production efficiency by providing more material for a brehm photon to pair produce in?		Question: Will a thicker downstream exit window increase the positron production efficiency by providing more material for a brehm photon to pair produce in?