Speaker
Description
Organic and inorganic Optical Fibers (OFs) are increasingly utilized in space and medical applications, including accelerator and reactor environments to monitor beam currents and shapes, doses, temperatures, and pressures [1-5]. OFs are ideal as they can be radiation hard, small in size, independent from electro-magnetic environments, and linear over a large measurement range. Here we present a new application in conjunction with a medical cyclotron, where a collar of four Ce-doped silica fibers is mounted onto a beam line. In our experiments, measurements of the OF scintillation signal from prompt neutrons and gammas produced by the proton beam as its bombardment position changes in a beam dump are made. This is an extension of our previous work with a similar setup to monitor beam delivery onto a medical isotope target at a cyclotron [6]. The advantage is that the OFs are outside of the vacuum and do not need to intercept the beam. Initial testing shows that monitoring of a 150 nA beam of 18 MeV protons into a beam dump is possible. The monitor can measure relative beam current and beam displacement in X and Y as a function of magnetic steering. Further testing is underway.
Footnotes
[1] Sensors, 2020, 20, 4510
[2] Nukleonika, 2016, 61, 11
[3] IEEE Sensors 2018, 18, 1513
[4] Scientific Report, 2019, 9, 16376
[5] 2016 JINST 11 P03027
[6] Applied Sciences, 2020, 10, 4488
Funding Agency
TRIUMF receives funding via a contribution agreement with the National Research Council of Canada. This research was partially funded by the NSERC [RGPIN 2016-03972] and by the SNSF [CRSII5_180352].
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