Linac Run Plan April 2018, Dr. McNulty

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

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

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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]

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Thesis

May 31st 2018 - 25b 0 degree port