Linac Run Plan April 2018, Dr. McNulty

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Beam Line info

0 degree line

Aluminum window = 0.5mm thick. Radius = 23.813mm

Air gap between Aluminum window and glass slide = 45mm

Glass slide Thickness = 1mm

Run Plan

To find operating point

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

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

Machine: 25b Linac

Beam Energy: 8 MeV

Rep Rate: Max (150Hz)

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

Shot # Start Time End Time Number of Pulses Number of OSLs Distance to end of beampipe Beam Current Aluminum Brick
1 7:00am 7:05am 2 1 1m 5 mA Out
2 7:10am 7:15am 2 1 1m 10 mA Out
3 7:20am 7:25am 2 1 1m 25 mA Out
4 7:30am 7:35am 2 1 1m 50 mA Out
5 7:40am 7:45am 2 1 1m 25 mA Out
6 7:50am 7:55am 2 1 1m 25 mA Out
7 8:00am 8:05am 2 16 1m 25 mA In
8 8:10am 8:15am 2 16 1m 25 mA In
9 8:20am 8:25am 2 16 1m 25 mA Out
10 8:30am 8:35am 2 16 1m 25 mA Out
11 8:40am 8:45am 2 16 1m 25 mA Out


Highest single pulse simulated parameters are 25mA with 100ns pulse width.

Absorbed Dose Information

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

Assuming 100mApulse and a pulse width of 100ns

Then 100mApulse=100mCspulse=0.1Cspulse

0.1Cspulse(100ns)=10109Cpulse

10109Cpulse1 e1.6021019=6.24221010epulse

Using a distance of 25cm for all simulations following.

OSL

11000 of a pulse. ~62mil e- simulated, ~62bil e- per pulse. With beam parameters given above.

Deposited Energy: 4.46596106MeV

OSL geometry: 0.501cm diameter cylinder of 0.03cm thickness with beam incident on flat face.

OSL Crystal density=3.9698gcm3

Mass of a single OSL crystal: (π(0.2505)2(0.03))(3.9698)=0.0234777g

Scaling deposited energy by 1000 to account for only shooting a 1000th of a pulse, the deposited energy becomes 4.46596109MeV

Converting to Joules for dose calculation: 4.46596109MeV=7.15525104J

Average dose per pulse 7.15525104J0.0234777103 Kg=30.4768 Gy=3047.68 rad

Quartz

11000 of a pulse. ~62mil e- simulated, ~62bil e- per pulse. With beam parameters given above.

Deposited Energy: 4.71875108MeV

Quartz Geometry: 1 inch cylinder with electrons incident upon the base of the cylinder.

Quartz density=2.32gcm3

Mass of Quartz used in simulation: (π(1.27)2(2.54))(2.32)=29.8593g

Scaling deposited energy by 1000 to account for only shooting a 1000th of a pulse, the deposited energy becomes 4.718751011MeV

Converting to Joules for dose calculation: 4.718751011MeV=0.0756027J

Average dose per pulse 0.0756027 J29.8593103 Kg=2.53196 Gy=253.196 rad

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

Cut current by a factor of 4. 100mA->25mA

Assuming 25mApulse and a pulse width of 100ns

Then 25mApulse=25mCspulse=0.025Cspulse

0.025Cspulse(100ns)=2.5109Cpulse

2.5109Cpulse1 e1.6021019=1.560551010epulse

Using a distance of 25cm for all simulations following.

OSL

11000 of a pulse. ~15mil e- simulated, ~15bil e- per pulse. With beam parameters given above.

Deposited Energy: 1.11636106MeV

OSL geometry: 0.501cm diameter cylinder of 0.03cm thickness with beam incident on flat face.

OSL Crystal density=3.9698gcm3

Mass of a single OSL crystal: (π(0.2505)2(0.03))(3.9698)=0.0234777g

Scaling deposited energy by 1000 to account for only shooting a 1000th of a pulse, the deposited energy becomes 1.11636109MeV

Converting to Joules for dose calculation: 1.11636109MeV=1.78841104J

Average dose per pulse 1.78841104J0.0234777103 Kg=7.61748 Gy=761.748 rad

Quartz

11000 of a pulse. ~15mil e- simulated, ~15bil e- per pulse. With beam parameters given above.

Deposited Energy: 9.82027107MeV

Quartz Geometry: 1 inch diameter, 0.5 inch tall cylinder with electrons incident upon the base of the cylinder.

Quartz density=2.32gcm3

Mass of Quartz used in simulation: (π(1.27)2(1.27))(2.32)=14.9296g

Scaling deposited energy by 1000 to account for only shooting a 1000th of a pulse, the deposited energy becomes 9.820271010MeV

Converting to Joules for dose calculation: 9.820271010MeV=0.0157321J

Average dose per pulse 0.0157321 J14.9296103 Kg=1.05375 Gy=105.375 rad

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

Changed distance from end of beam pipe from 25cm to 50cm.

Cut current by a factor of 4. 100mA->25mA

Assuming 25mApulse and a pulse width of 100ns

Then 25mApulse=25mCspulse=0.025Cspulse

0.025Cspulse(100ns)=2.5109Cpulse

2.5109Cpulse1 e1.6021019=1.560551010epulse

OSL

11000 of a pulse. ~15mil e- simulated, ~15bil e- per pulse. With beam parameters given above.

Deposited Energy: 9.29701105MeV

OSL geometry: 0.501cm diameter cylinder of 0.03cm thickness with beam incident on flat face.

OSL Crystal density=3.9698gcm3

Mass of a single OSL crystal: (π(0.2505)2(0.03))(3.9698)=0.0234777g

Scaling deposited energy by 1000 to account for only shooting a 1000th of a pulse, the deposited energy becomes 9.29701108MeV

Converting to Joules for dose calculation: 9.29701108MeV=1.48938104J

Average dose per pulse: 1.48938104J0.0234777103 Kg=6.34381 Gy=634.381 rad

Quartz

11000 of a pulse. ~15mil e- simulated, ~15bil e- per pulse. With beam parameters given above.

Deposited Energy: 9.21601107MeV

Quartz Geometry: 1 inch diameter, 0.5 inch tall cylinder with electrons incident upon the base of the cylinder.

Quartz density=2.32gcm3

Mass of Quartz used in simulation: (π(1.27)2(1.27))(2.32)=14.9296g

Scaling deposited energy by 1000 to account for only shooting a 1000th of a pulse, the deposited energy becomes 9.216011010MeV

Converting to Joules for dose calculation: 9.216011010MeV=0.0147657J

Average dose per pulse 0.0147657 J14.9296103 Kg=0.98902 Gy=98.902 rad

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

Added .254cm of Tungsten and 2.286cm of Aluminum to be used as converter and beam stop.

Radiator.png

Assuming 25mApulse and a pulse width of 100ns

Then 25mApulse=25mCspulse=0.025Cspulse

0.025Cspulse(100ns)=2.5109Cpulse

2.5109Cpulse1 e1.6021019=1.560551010epulse

OSL (8MeV)

11000 of a pulse. ~15mil e- simulated, ~15bil e- per pulse. With beam parameters given above.

Deposited Energy: 19.1759MeV

OSL geometry: 0.501cm diameter cylinder of 0.03cm thickness with beam incident on flat face.

OSL Crystal density=3.9698gcm3

Mass of a single OSL crystal: (π(0.2505)2(0.03))(3.9698)=0.0234777g

Scaling deposited energy by 1000 to account for only shooting a 1000th of a pulse, the deposited energy becomes 9.29701108MeV

Converting to Joules for dose calculation: 19.1759103MeV=3.0723177109J

Average dose per pulse: 3.0723177109J0.0234777103 Kg=0.000130861 Gy=0.0130861 rad



Thesis