Experimental Methods and Setup

A custom run plan was created to test simulated dose per pulse results. This run plan began with an attempt to show reproducibility. To find how reproducible the OSLs are, a single OSL is placed in the center of the beam spot of the 25b accelerator at the IAC. The IAC engineers set up the centered laser for experimental use, and using a glass plate placed at 50cm, to be used as a backing plate, OSLs were exposed to a differing number of pulses under the same beam characteristics. These characteristics are as follows:

Beam energy: 8 Mev

Pulse width: 500ns

Peak current: 50mA.

Shot #	Number of Pulses	Number of OSLs	Dose (Rad) (0,0)	Dose/pulse (Rad) (0,0)	Al Brick with W Converter	Expected Dose/pulse (Rad)
1	6	1	768.10344	128.017	Out
2	6	1	795.26442	132.544	Out
3	6	16	-	Off Center	Out	-
4	6	17	592.89645	98.816075	Out
5	6	1	1435.75504	239.292	Out
6	2	1	468.28238	234.141	Out
7	4	1	842.87814	210.719	Out
8	5	1	1062.99342	212.598	Out
9	3	1	646.63748	215.545	Out
10	6	17	796.48564	199.12141	Out
11	51948	17	531.9275	.01023961461	In
12	52106	17	541.85896	.01039916631	In
13	6	1

Through this run plan, dose per pulse measurements are taken. As the OSLs have a maximum operating point at 1500 Rad, it was decided to keep the dose in the middle of the operating range. With the listed beam characteristics, six unattenuated pulses is the maximum possible to subject the OSLs to without saturating the OSLs.

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The point of the electrons was to find dose/pulse information on-axis of the accelerator to help find total dose for quartz. This information was then used to irradiate some quartz and ABS plastic samples to a known dose, to allow for rad hard tests. Along with structural integrity tests in the plastic. (transparency in quartz).

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Thesis