Linac Run Plan April 2018, Dr. McNulty

Date

85 useable OSLs

Machine: 24b Linac

Beam Energy: 8 MeV

Rep Rate: Max (180Hz)?

Shot #	Start Time	End Time	Number of OSLs	Distance to end of beampipe	Beam Current	Aluminum Brick	Background Subtracted PMT Counts
1	7am	7:15am	1	25cm	amps	Out
2	7:20am	7:35am	1	25cm	amps	Out
3	7:40am	7:55am	1	25cm	amps	Out
4	8:00	8:20	1	25cm	amps	Out
5			1	25cm	amps	Out
6			1	25cm	amps	In
7			1	25cm	amps	In
8			1	25cm	amps	In
9			1	25cm	amps	In
10			1	25cm	amps	In
11			10	25cm	amps	Out
12			10	25cm	amps	Out
13			10	25cm	amps	Out
14			10	25cm	amps	Out
15			10	25cm	amps	Out
16			10	25cm	amps	In
17			15	25cm	amps	In

Calculations

Assuming $100\frac{mA}{pulse}$ and a pulse width of $100ns$

Then $100\frac{mA}{pulse}=100\frac{mC}{s*pulse}=0.1\frac{C}{s*pulse}$

$0.1\frac{C}{s*pulse}(100ns)=10*10^{-9}\frac{C}{pulse}$

$10*10^{-9}\frac{C}{pulse}*\frac{1\ e-}{1.602*10^{-19}}=6.2422*10^{10}\frac{e-}{pulse}$

Absorbed Dose Information

OSL

$\frac{1}{1000}$ of a pulse. ~62mil e- simulated, ~62bil e- per pulse. With beam parameters given above.

Deposited Energy: $4.46596*10^{6} MeV$

OSL Crystal density$=3.9698\frac{g}{cm^{3}}$

Mass of a single OSL crystal: $(\pi(0.501)^{2}*(0.03))*(3.9698)=0.0234777g$

Scaling deposited energy by 1000 to account for only shooting a 1000th of a pulse, the deposited energy becomes $4.46596*10^{10} MeV$

Converting to Joules for dose calculation: $4.46596*10^{10} MeV=7.15525*10^{-5}J$

Average dose per pulse $\frac{7.15525*10^{-5}J}{0.0234777*10^{-3}\ Kg}=3.04768\ Gy=304.768\ rad$

Quartz

$\frac{1}{1000}$ of a pulse. ~62mil e- simulated, ~62bil e- per pulse. With beam parameters given above.

Deposited Energy: $4.71875*10^{8} MeV$

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

Quartz density$=2.32\frac{g}{cm^{3}}$

Mass of Quartz used in simulation: $(\pi(1.27)^{2}*(2.54))*(2.32)=29.8593g$

Scaling deposited energy by 1000 to account for only shooting a 1000th of a pulse, the deposited energy becomes $4.71875*10^{12} MeV$

Converting to Joules for dose calculation: $4.71875*10^{12} MeV=0.756027J$

Average dose per pulse $\frac{0.756027\ J}{29.8593*10^{-3}\ Kg}=25.3196\ Gy=2531.96\ rad$

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Thesis