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

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−
=[[Absorbed Dose Information]]=
+
=Beam Line info=
  
−
==Calculations (1)==
+
Machine: 25b Linac
  
−
Assuming <math>100\frac{mA}{pulse}</math> and a pulse width of <math>100ns</math>
+
0<math>&deg;</math> port
  
−
Then <math>100\frac{mA}{pulse}=100\frac{mC}{s*pulse}=0.1\frac{C}{s*pulse}</math>
+
Beam Energy: 8 MeV
  
−
<math>0.1\frac{C}{s*pulse}(100ns)=10*10^{-9}\frac{C}{pulse}</math>
+
Rep Rate: Max (150Hz?)
  
−
<math>10*10^{-9}\frac{C}{pulse}*\frac{1\ e-}{1.602*10^{-19}}=6.2422*10^{10}\frac{e-}{pulse}</math>
+
Pulse Width: 100ns
  
−
Using a distance of 25cm for all simulations following.
+
=Run Plan=
  
−
===OSL===
+
==To find operating point==
  
−
<math>\frac{1}{1000}</math> of a pulse. ~62mil e- simulated, ~62bil e- per pulse. With beam parameters given above.
+
- Will use 15 OSLs from reproducibility study to make sure that dose is within acceptable range
  
−
Deposited Energy: <math>4.46596*10^{6} MeV</math>
+
===Table===
  
−
OSL geometry: 0.501cm diameter cylinder of 0.03cm thickness with beam incident on flat face.
+
'''Start at 7am'''
  
−
OSL Crystal density<math>=3.9698\frac{g}{cm^{3}}</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|| ||
 +
|}
  
−
Mass of a single OSL crystal: <math>(\pi(0.2505)^{2}*(0.03))*(3.9698)=0.0234777g</math>
+
==Experiment==
  
−
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>
+
85 Nanodot OSLs for use (dose not include OSLs from reproducibility study)
  
−
Converting to Joules for dose calculation: <math>4.46596*10^{9} MeV=7.15525*10^{-4}J</math>
+
- upper limit of OSLs is 15Gy, want to be around 7.5Gy with multiple pulses
  
−
Average dose per pulse <math>\frac{7.15525*10^{-4}J}{0.0234777*10^{-3}\ Kg}=30.4768\ Gy=3047.68\ rad</math>
+
Will talk to engineers about double pulsing and guaranteeing number of pulses and update.  
  
−
===Quartz===
+
===Table===
  
−
<math>\frac{1}{1000}</math> of a pulse. ~62mil e- simulated, ~62bil e- per pulse. With beam parameters given above.
+
:{| 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 || ||
 +
|-
 +
|}
  
−
Deposited Energy: <math>4.71875*10^{8} MeV</math>
+
=[[Absorbed Dose Information]]=
  
−
Quartz Geometry: 1 inch cylinder with electrons incident upon the base of the cylinder.  
+
Titanium window = 0.5mm thick. Radius = 23.813mm
  
−
Quartz density<math>=2.32\frac{g}{cm^{3}}</math>
+
Air gap between Titanium window and glass slide = 45mm
  
−
Mass of Quartz used in simulation: <math>(\pi(1.27)^{2}*(2.54))*(2.32)=29.8593g</math>
+
Glass slide Thickness = 1mm
  
−
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>
+
==[[5mA, 100ns pulse width, 100cm from beam pipe with Titanium window]]==
  
−
Converting to Joules for dose calculation: <math>4.71875*10^{11} MeV=0.0756027J</math>
+
==[[25mA, 100ns pulse width, 100cm from beam pipe, with Titanium window]]==
  
−
Average dose per pulse <math>\frac{0.0756027\ J}{29.8593*10^{-3}\ Kg}=2.53196\ Gy=253.196\ rad</math>
+
==[[10mA, 100ns pulse width, 100cm from beam pipe, with Titanium window]]==
  
−
==Calculations (2)==
+
==[[100mA, 100ns pulse width, 100cm from beam pipe, with Titanium window]]==
  
−
Cut current by a factor of 4. 100mA->25mA
+
==[[25mA, 100ns pulse width, 50cm from beam pipe, tungsten target with aluminum beamstop]]==
  
−
Assuming <math>25\frac{mA}{pulse}</math> and a pulse width of <math>100ns</math>
+
----
  
−
Then <math>25\frac{mA}{pulse}=25\frac{mC}{s*pulse}=0.025\frac{C}{s*pulse}</math>
+
==[[100mA, 100ns pulse width, 25cm from beam pipe]]==
  
−
<math>0.025\frac{C}{s*pulse}(100ns)=2.5*10^{-9}\frac{C}{pulse}</math>
+
==[[25mA, 100ns pulse width, 25cm from beam pipe]]==
  
−
<math>2.5*10^{-9}\frac{C}{pulse}*\frac{1\ e-}{1.602*10^{-19}}=1.56055*10^{10}\frac{e-}{pulse}</math>
+
==[[25mA, 100ns pulse width, 50cm from beam pipe]]==
  
−
Using a distance of 25cm for all simulations following.
 
  
−
===OSL===
+
----
−
 
 
−
<math>\frac{1}{1000}</math> of a pulse. ~15mil e- simulated, ~15bil e- per pulse. With beam parameters given above.
 
−
 
 
−
Deposited Energy: <math>1.11636*10^{6} MeV</math>
 
−
 
 
−
OSL geometry: 0.501cm diameter cylinder of 0.03cm thickness with beam incident on flat face.
 
−
 
 
−
OSL Crystal density<math>=3.9698\frac{g}{cm^{3}}</math>
 
−
 
 
−
Mass of a single OSL crystal: <math>(\pi(0.2505)^{2}*(0.03))*(3.9698)=0.0234777g</math>
 
−
 
 
−
Scaling deposited energy by 1000 to account for only shooting a 1000th of a pulse, the deposited energy becomes <math>1.11636*10^{9} MeV</math>
 
−
 
 
−
Converting to Joules for dose calculation: <math>1.11636*10^{9} MeV=1.78841*10^{-4}J</math>
 
−
 
 
−
Average dose per pulse <math>\frac{1.78841*10^{-4}J}{0.0234777*10^{-3}\ Kg}=7.61748\ Gy=761.748\ rad</math>
 
−
 
 
−
===Quartz===
 
−
 
 
−
<math>\frac{1}{1000}</math> of a pulse. ~15mil e- simulated, ~15bil e- per pulse. With beam parameters given above.
 
−
 
 
−
Deposited Energy: <math>9.82027*10^{7} MeV</math>
 
−
 
 
−
Quartz Geometry: 1 inch diameter, 0.5 inch tall cylinder with electrons incident upon the base of the cylinder.
 
  
−
Quartz density<math>=2.32\frac{g}{cm^{3}}</math>
+
Low Dose Line: Dose = (0.11 +/- 0.01)(PMT Counts) + (119.29 +/- 29.08)
  
−
Mass of Quartz used in simulation: <math>(\pi(1.27)^{2}*(2.54))*(2.32)=29.8593g</math>
+
High Dose Line: Dose = (1.54 +/- 0.06)(PMT Counts) + (1004.80 +/- 1006.24)
  
−
Scaling deposited energy by 1000 to account for only shooting a 1000th of a pulse, the deposited energy becomes <math>9.82027*10^{10} MeV</math>
 
  
−
Converting to Joules for dose calculation: <math>9.82027*10^{10} MeV=0.0157321J</math>
+
Peak Current: <math>50\frac{mA}{pulse}</math>  
  
−
Average dose per pulse <math>\frac{0.0157321\ J}{29.8593*10^{-3}\ Kg}=0.526873\ Gy=52.6873\ rad</math>
+
Pulse Width: <math>500ns</math>
  
−
==Calculations (3)==
 
  
−
Changed distance from end of beam pipe from 25cm to 50cm.  
+
<math>50\frac{mA}{pulse}=50\frac{mC}{s*pulse}=0.050\frac{C}{s*pulse}</math>
  
−
Cut current by a factor of 4. 100mA->25mA
+
<math>0.050\frac{C}{s*pulse}(500ns)=2.5*10^{-8}\frac{C}{pulse}</math>
−
 
 
−
Assuming <math>25\frac{mA}{pulse}</math> and a pulse width of <math>100ns</math>
 
−
 
 
−
Then <math>25\frac{mA}{pulse}=25\frac{mC}{s*pulse}=0.025\frac{C}{s*pulse}</math>
 
−
 
 
−
<math>0.025\frac{C}{s*pulse}(100ns)=2.5*10^{-9}\frac{C}{pulse}</math>
 
−
 
 
−
<math>2.5*10^{-9}\frac{C}{pulse}*\frac{1\ e-}{1.602*10^{-19}}=1.56055*10^{10}\frac{e-}{pulse}</math>
 
−
 
 
−
===OSL===
 
−
 
 
−
<math>\frac{1}{1000}</math> of a pulse. ~15mil e- simulated, ~15bil e- per pulse. With beam parameters given above.
 
−
 
 
−
Deposited Energy: <math>9.29701*10^{5} MeV</math>
 
−
 
 
−
OSL geometry: 0.501cm diameter cylinder of 0.03cm thickness with beam incident on flat face.
 
−
 
 
−
OSL Crystal density<math>=3.9698\frac{g}{cm^{3}}</math>
 
−
 
 
−
Mass of a single OSL crystal: <math>(\pi(0.2505)^{2}*(0.03))*(3.9698)=0.0234777g</math>
 
−
 
 
−
Scaling deposited energy by 1000 to account for only shooting a 1000th of a pulse, the deposited energy becomes <math>9.29701*10^{8} MeV</math>
 
−
 
 
−
Converting to Joules for dose calculation: <math>9.29701*10^{8} MeV=1.48938*10^{-4}J</math>
 
−
 
 
−
Average dose per pulse: <math>\frac{1.48938*10^{-4}J}{0.0234777*10^{-3}\ Kg}=6.34381*10^{-6}\ Gy=6.34381*10^{-4}\ rad</math>
 
−
 
 
−
===Quartz===
 
−
 
 
−
<math>\frac{1}{1000}</math> of a pulse. ~15mil e- simulated, ~15bil e- per pulse. With beam parameters given above.
 
−
 
 
−
Deposited Energy: <math>9.82027*10^{7} MeV</math>
 
−
 
 
−
Quartz Geometry: 1 inch diameter, 0.5 inch tall cylinder with electrons incident upon the base of the cylinder.
 
−
 
 
−
Quartz density<math>=2.32\frac{g}{cm^{3}}</math>
 
−
 
 
−
Mass of Quartz used in simulation: <math>(\pi(1.27)^{2}*(2.54))*(2.32)=29.8593g</math>
 
−
 
 
−
Scaling deposited energy by 1000 to account for only shooting a 1000th of a pulse, the deposited energy becomes <math>9.82027*10^{10} MeV</math>
 
−
 
 
−
Converting to Joules for dose calculation: <math>9.82027*10^{10} MeV=0.0157321J</math>
 
−
 
 
−
Average dose per pulse <math>\frac{0.0157321\ J}{29.8593*10^{-3}\ Kg}=0.526873\ Gy=52.6873\ rad</math>
 
  
 +
<math>2.5*10^{-8}\frac{C}{pulse}*\frac{1\ e-}{1.602*10^{-19}}=1.56055*10^{11}\frac{e-}{pulse}</math>
  
  
Line 155: Line 154:
 
----
 
----
 
[[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

Retrieved from "https://wiki.iac.isu.edu/index.php?title=Linac_Run_Plan_April_2018,_Dr._McNulty&oldid=123674"