Determining spectral response of the National Ignition Facility particle time of flight diagnostic to x rays
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Author(s)
Reichelt, Benjamin L.
Kabadi, Neel V.
Pearcy, Jacob A.
Gatu Johnson, Maria
Dannhoff, S.
Lahmann, Brandon
Frenje, Johan A.
Li, Chi-Kang
Sutcliffe, G.
Kunimune, Justin H.
Date Issued
June 2022
Journal
Review of Scientific Instruments
Publisher
AIP
Abstract
The Particle Time of Flight (PTOF) diagnostic is a chemical vapor deposition (CVD) diamond detector used for measuring multiple nuclear bang times at the National Ignition Facility (NIF). Due to the non-trivial, polycrystalline structure of these detectors, individual characterization and measurement is required to interrogate the sensitivity and behavior of charge carriers. In this paper, a process is developed for determining the xray sensitivity of PTOF detectors and relating it to intrinsic properties of the detector. We demonstrate that the diamond sample measured has a significant non-homogeneity in its properties, with the sensitivity given by a linear model $ax+b$, where $a=0.60 \pm 0.16 V^{-1}mm^{-1}$ and $b=0.00 \pm 0.04 V^{-1}$. We also use this method to confirm an electron to hole mobility ratio of $1.5 \pm 1.0$ and an effective band gap of $1.8 eV$ rather than the theoretical $5.5eV$, leading to a large sensitivity increase.
Description
Submitted for publication in Review of Scientific Instruments
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1063/5.0101725
