Difference between revisions of "Linac Run Plan April 2018, Dr. McNulty"

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==Calculations==
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=Beam Line info=
  
−
Assuming <math>100\frac{mA}{pulse}</math> and a pulse width of <math>100ns</math>
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Machine: 25b Linac
  
−
Then <math>100\frac{mA}{pulse}=100\frac{mC}{s*pulse}=0.1\frac{C}{s*pulse}</math>
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0<math>&deg;</math> port
  
−
<math>0.1\frac{C}{s*pulse}(100ns)=10*10^{-9}\frac{C}{pulse}</math>
+
Beam Energy: 8 MeV
  
−
<math>10*10^{-9}\frac{C}{pulse}*\frac{1\ e-}{1.602*10^{-19}}=6.2422*10^{10}\frac{e-}{pulse}</math>
+
Rep Rate: Max (150Hz?)
  
 +
Pulse Width: 100ns
  
 +
=Run Plan=
  
−
==[[Absorbed Dose Information]]==
+
==To find operating point==
  
−
Using a distance of 25cm for all simulations following.
+
- Will use 15 OSLs from reproducibility study to make sure that dose is within acceptable range
  
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===OSL===
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===Table===
  
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<math>\frac{1}{1000}</math> of a pulse. ~62mil e- simulated, ~62bil e- per pulse. With beam parameters given above.
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'''Start at 7am'''
  
−
Deposited Energy: <math>4.46596*10^{6} MeV</math>
+
:{| border="2" style="text-align:center;" |cellpadding="20" cellspacing="0"
 +
! scope="col" style="width: 50px;" | Shot #
 +
! scope="col" style="width: 150px;" | Number of Pulses
 +
! scope="col" style="width: 150px;" | Number of OSLs
 +
! scope="col" style="width: 150px;" | Beam Current
 +
! scope="col" style="width: 150px;" | Dose/pulse
 +
! scope="col" style="width: 150px;" | Expected Dose/pulse
 +
|-
 +
| 1 || 80 || 1 ||50 mA || ||
 +
|-
 +
| 2 ||  || 1 || mA || ||
 +
|-
 +
| 3  || || 1 ||  mA || ||
 +
|-
 +
| 4 || || 1 ||  mA || ||
 +
|-
 +
| 5  || || 1 || mA || ||
 +
|-
 +
| 6  || || 1 ||  mA || ||
 +
|-
 +
| 7  || || 1 ||  mA || ||
 +
|-
 +
| 8  || || 1 ||  mA || ||
 +
|-
 +
| 9  || || 1 || mA || ||
 +
|-
 +
| 10 || || 1 || mA || ||
 +
|-
 +
| 11  || || 1 || mA || ||
 +
|-
 +
| 12  || || 1 || mA|| ||
 +
|-
 +
| 13  || || 1 || mA|| ||
 +
|-
 +
| 14  || || 1 || mA|| ||
 +
|-
 +
| 15  || || 1 || mA|| ||
 +
|}
  
−
OSL geometry: 0.501cm diameter cylinder of 0.03cm thickness with beam incident on flat face.
+
==Experiment==
  
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OSL Crystal density<math>=3.9698\frac{g}{cm^{3}}</math>
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85 Nanodot OSLs for use (dose not include OSLs from reproducibility study)
  
−
Mass of a single OSL crystal: <math>(\pi(0.2505)^{2}*(0.03))*(3.9698)=0.0234777g</math>
+
- upper limit of OSLs is 15Gy, want to be around 7.5Gy with multiple pulses
  
−
Scaling deposited energy by 1000 to account for only shooting a 1000th of a pulse, the deposited energy becomes <math>4.46596*10^{9} MeV</math>
+
Will talk to engineers about double pulsing and guaranteeing number of pulses and update.  
  
−
Converting to Joules for dose calculation: <math>4.46596*10^{9} MeV=7.15525*10^{-4}J</math>
+
===Table===
  
−
Average dose per pulse <math>\frac{7.15525*10^{-4}J}{0.0234777*10^{-3}\ Kg}=30.4768\ Gy=3047.68\ rad</math>
+
:{| border="2" style="text-align:center;" |cellpadding="20" cellspacing="0  
 +
|-
 +
! scope="col" style="width: 50px;" | Shot #
 +
! scope="col" style="width: 120px;" | Number of Pulses
 +
! scope="col"| Number of OSLs
 +
! scope="col" style="width: 150px;" | Beam Current
 +
! scope="col" style="width: 150px;" | Aluminum Brick
 +
! scope="col" style="width: 150px;" | Dose/Pulse
 +
! scope="col" style="width: 150px;" | Expected Dose/Pulse
 +
|-
 +
| 1  ||  || 1 || mA || Out || ||
 +
|-
 +
| 2 ||  || 1 ||  mA || Out || || 
 +
|-
 +
| 3|| || 1 ||  mA || Out  || ||
 +
|-
 +
| 4 || || 1 ||  mA || Out  || ||
 +
|-
 +
| 5 || || 1 || mA || Out  || ||
 +
|-
 +
| 6 || || 1 ||  mA || Out  || ||
 +
|-
 +
| 7 || || 16 ||  mA || In || ||
 +
|-
 +
| 8 || || 16 ||  mA || In  || ||
 +
|-
 +
| 9 || || 16 || mA || Out || ||
 +
|-
 +
| 10 || || 16 || mA || Out || ||
 +
|-
 +
| 11 || || 16 || mA || Out || ||
 +
|-
 +
|}
  
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===Quartz===
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=[[Absorbed Dose Information]]=
  
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<math>\frac{1}{1000}</math> of a pulse. ~62mil e- simulated, ~62bil e- per pulse. With beam parameters given above.
+
Titanium window = 0.5mm thick. Radius = 23.813mm
  
−
Deposited Energy: <math>4.71875*10^{8} MeV</math>
+
Air gap between Titanium window and glass slide = 45mm
  
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Quartz Geometry: 1 inch cylinder with electrons incident upon the base of the cylinder.
+
Glass slide Thickness = 1mm
  
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Quartz density<math>=2.32\frac{g}{cm^{3}}</math>
+
==[[5mA, 100ns pulse width, 100cm from beam pipe with Titanium window]]==
  
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Mass of Quartz used in simulation: <math>(\pi(1.27)^{2}*(2.54))*(2.32)=29.8593g</math>
+
==[[25mA, 100ns pulse width, 100cm from beam pipe, with Titanium window]]==
  
−
Scaling deposited energy by 1000 to account for only shooting a 1000th of a pulse, the deposited energy becomes <math>4.71875*10^{11} MeV</math>  
+
==[[10mA, 100ns pulse width, 100cm from beam pipe, with Titanium window]]==
 +
 
 +
==[[100mA, 100ns pulse width, 100cm from beam pipe, with Titanium window]]==
 +
 
 +
==[[25mA, 100ns pulse width, 50cm from beam pipe, tungsten target with aluminum beamstop]]==
 +
 
 +
----
 +
 
 +
==[[100mA, 100ns pulse width, 25cm from beam pipe]]==
 +
 
 +
==[[25mA, 100ns pulse width, 25cm from beam pipe]]==
 +
 
 +
==[[25mA, 100ns pulse width, 50cm from beam pipe]]==
 +
 
 +
 
 +
----
 +
 
 +
Low Dose Line: Dose = (0.11 +/- 0.01)(PMT Counts) + (119.29 +/- 29.08)
 +
 
 +
High Dose Line: Dose = (1.54 +/- 0.06)(PMT Counts) + (1004.80 +/- 1006.24)
 +
 
 +
 
 +
Peak Current: <math>50\frac{mA}{pulse}</math>
 +
 
 +
Pulse Width: <math>500ns</math>
 +
 
 +
 
 +
<math>50\frac{mA}{pulse}=50\frac{mC}{s*pulse}=0.050\frac{C}{s*pulse}</math>
 +
 
 +
<math>0.050\frac{C}{s*pulse}(500ns)=2.5*10^{-8}\frac{C}{pulse}</math>
 +
 
 +
<math>2.5*10^{-8}\frac{C}{pulse}*\frac{1\ e-}{1.602*10^{-19}}=1.56055*10^{11}\frac{e-}{pulse}</math>
  
−
Converting to Joules for dose calculation: <math>4.71875*10^{11} MeV=0.0756027J</math>
 
  
−
Average dose per pulse <math>\frac{0.0756027\ J}{29.8593*10^{-3}\ Kg}=2.53196\ Gy=253.196\ rad</math>
 
  
  
 
----
 
----
 
[[Thesis]]
 
[[Thesis]]
 +
 +
[[May 31st 2018 - 25b 0 degree port]]

Latest revision as of 01:41, 27 June 2018

Beam Line info

Machine: 25b Linac

0[math]°[/math] port

Beam Energy: 8 MeV

Rep Rate: Max (150Hz?)

Pulse Width: 100ns

Run Plan

To find operating point

- Will use 15 OSLs from reproducibility study to make sure that dose is within acceptable range

Table

Start at 7am

Shot # Number of Pulses Number of OSLs Beam Current Dose/pulse Expected Dose/pulse
1 80 1 50 mA
2 1 mA
3 1 mA
4 1 mA
5 1 mA
6 1 mA
7 1 mA
8 1 mA
9 1 mA
10 1 mA
11 1 mA
12 1 mA
13 1 mA
14 1 mA
15 1 mA

Experiment

85 Nanodot OSLs for use (dose not include OSLs from reproducibility study)

- upper limit of OSLs is 15Gy, want to be around 7.5Gy with multiple pulses

Will talk to engineers about double pulsing and guaranteeing number of pulses and update.

Table

Shot # Number of Pulses Number of OSLs Beam Current Aluminum Brick Dose/Pulse Expected Dose/Pulse
1 1 mA Out
2 1 mA Out
3 1 mA Out
4 1 mA Out
5 1 mA Out
6 1 mA Out
7 16 mA In
8 16 mA In
9 16 mA Out
10 16 mA Out
11 16 mA Out

Absorbed Dose Information

Titanium window = 0.5mm thick. Radius = 23.813mm

Air gap between Titanium window and glass slide = 45mm

Glass slide Thickness = 1mm

5mA, 100ns pulse width, 100cm from beam pipe with Titanium window

25mA, 100ns pulse width, 100cm from beam pipe, with Titanium window

10mA, 100ns pulse width, 100cm from beam pipe, with Titanium window

100mA, 100ns pulse width, 100cm from beam pipe, with Titanium window

25mA, 100ns pulse width, 50cm from beam pipe, tungsten target with aluminum beamstop

100mA, 100ns pulse width, 25cm from beam pipe

25mA, 100ns pulse width, 25cm from beam pipe

25mA, 100ns pulse width, 50cm from beam pipe

Low Dose Line: Dose = (0.11 +/- 0.01)(PMT Counts) + (119.29 +/- 29.08)

High Dose Line: Dose = (1.54 +/- 0.06)(PMT Counts) + (1004.80 +/- 1006.24)


Peak Current: [math]50\frac{mA}{pulse}[/math]

Pulse Width: [math]500ns[/math]


[math]50\frac{mA}{pulse}=50\frac{mC}{s*pulse}=0.050\frac{C}{s*pulse}[/math]

[math]0.050\frac{C}{s*pulse}(500ns)=2.5*10^{-8}\frac{C}{pulse}[/math]

[math]2.5*10^{-8}\frac{C}{pulse}*\frac{1\ e-}{1.602*10^{-19}}=1.56055*10^{11}\frac{e-}{pulse}[/math]



Thesis

May 31st 2018 - 25b 0 degree port

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