Optimization of particle fluence in micromachining of CR-39

Rajta, I.; Baradács, Eszter; Bettiol, A.A.; Csige, I.; Tőkési, K.; Budai, Laszlo; Kiss, Á.Z.

doi:10.1016/j.nimb.2005.01.087

Cited by 9 publications

(1 citation statement)

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“…Previous studies of the usage of CR-39 detectors in high-fluence applications have focused on details of track formation 13 and models of track overlap probability, 10,13,14 as well as the optical properties of CR-39 in the highly saturated regime. 15 This work seeks to determine empirically the minimum etch time required for all tracks to become visible, to asa) Electronic mail: mrosenbe@mit.edu sess the fluence upper limit for 100% detection on CR-39 specifically for protons, and to establish a technique for extending the yield upper limit of operation of CR-39-based measurements by reducing the fluence at the CR-39 surface.…”

Section: Introductionmentioning

confidence: 99%

Empirical assessment of the detection efficiency of CR-39 at high proton fluence and a compact, proton detector for high-fluence applications

Rosenberg

Séguin

Waugh

et al. 2014

Review of Scientific Instruments

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CR-39 solid-state nuclear track detectors are widely used in physics and in many inertial confinement fusion (ICF) experiments, and under ideal conditions these detectors have 100% detection efficiency for ∼0.5-8 MeV protons. When the fluence of incident particles becomes too high, overlap of particle tracks leads to under-counting at typical processing conditions (5 h etch in 6N NaOH at 80 °C). Short etch times required to avoid overlap can cause under-counting as well, as tracks are not fully developed. Experiments have determined the minimum etch times for 100% detection of 1.7-4.3-MeV protons and established that for 2.4-MeV protons, relevant for detection of DD protons, the maximum fluence that can be detected using normal processing techniques is ≲3 × 10(6) cm(-2). A CR-39-based proton detector has been developed to mitigate issues related to high particle fluences on ICF facilities. Using a pinhole and scattering foil several mm in front of the CR-39, proton fluences at the CR-39 are reduced by more than a factor of ∼50, increasing the operating yield upper limit by a comparable amount.

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