scholarly journals Charge Loss Considerations for Fast Ions in Gases

2021 ◽  
Author(s):  
R Musket
Keyword(s):  
Fast Ions ◽  
Charge Loss

scholarly journals Simulation of the loss of passing fast ions induced by magnetic islands in EAST tokamak plasmas

AIP Advances ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 025020
Author(s):  
Limin Yu ◽  
Erbing Xue ◽  
Debing Zhang ◽  
Shuyu Zheng ◽  
Xianmei Zhang ◽  
...  
Keyword(s):  
Tokamak Plasmas ◽  
Magnetic Islands ◽  
Fast Ions

scholarly journals Charge Sharing and Charge Loss in High-Flux Capable Pixelated CdZnTe Detectors

Sensors ◽  
2021 ◽  
Vol 21 (9) ◽  
pp. 3260
Author(s):  
Kjell A. L. Koch-Mehrin ◽  
Sarah L. Bugby ◽  
John E. Lees ◽  
Matthew C. Veale ◽  
Matthew D. Wilson
Keyword(s):  
Carrier Transport ◽  
Hole Transport ◽  
Uniform Electric Field ◽  
Photon Flux ◽  
High Flux ◽  
Charge Sharing ◽  
Cdte Detector ◽  
Charge Loss ◽  
Cdznte Detectors ◽  
Detector Model

Cadmium zinc telluride (CdZnTe) detectors are known to suffer from polarization effects under high photon flux due to poor hole transport in the crystal material. This has led to the development of a high-flux capable CdZnTe material (HF-CdZnTe). Detectors with the HF-CdZnTe material have shown promising results at mitigating the onset of the polarization phenomenon, likely linked to improved crystal quality and hole carrier transport. Better hole transport will have an impact on charge collection, particularly in pixelated detector designs and thick sensors (>1 mm). In this paper, the presence of charge sharing and the magnitude of charge loss were calculated for a 2 mm thick pixelated HF-CdZnTe detector with 250 μm pixel pitch and 25 μm pixel gaps, bonded to the STFC HEXITEC ASIC. Results are compared with a CdTe detector as a reference point and supported with simulations from a Monte-Carlo detector model. Charge sharing events showed minimal charge loss in the HF-CdZnTe, resulting in a spectral resolution of 1.63 ± 0.08 keV Full Width at Half Maximum (FWHM) for bipixel charge sharing events at 59.5 keV. Depth of interaction effects were shown to influence charge loss in shared events. The performance is discussed in relation to the improved hole transport of HF-CdZnTe and comparison with simulated results provided evidence of a uniform electric field.

The Spectral Response of Phosphors to Fast Ions

1973 ◽  
Vol 51 (11) ◽  
pp. 1143-1147 ◽  
Author(s):  
L. Hastings ◽  
E. H. Goh ◽  
B. J. Spenceley
Keyword(s):  
Spectral Distribution ◽  
Spectral Response ◽  
Fast Ions

The spectral distribution of the ionoluminescent response of a number of phosphors is compared to that of photoluminescence. For the single peaked phosphors, the response is the same. For a double peaked phosphor, ZnS:Ag, Cu, the response is quite different.

Computer studies of fast ion trajectories in crystals

1968 ◽  
Vol 46 (6) ◽  
pp. 503-516 ◽  
Author(s):  
D. V. Morgan ◽  
D. van Vliet
Keyword(s):  
Large Angle ◽  
Classical Dynamics ◽  
Perfect Lattice ◽  
Fast Ions ◽  
Angle Scattering ◽  
Initial Work ◽  
Fast Ion ◽  
Thermal Vibrations ◽  
Computer Studies ◽  
Good Agreement

A computer program has been developed which follows the trajectories of fast ions in crystals, based on the assumption of classical dynamics and binary collisions. Initial work has been directed at various aspects of proton channeling in copper in the energy range 5–500 keV. The critical angle and distance of closest approach in a perfect lattice have been evaluated for both rows and planes and compare well with the predictions of the continuum model as developed by Lindhard (1965). We also discuss the overlap of close-packed rows and planes, and the modifications necessary to the basic theory when thermal vibrations are introduced. Experiments have been simulated directly by obtaining a statistical analysis of the velocity distribution of protons reflected from a (100) face of copper and transmitted through a thin (~1800 Â) crystal. In reflection, distinct minima were obtained along directions corresponding to close-packed rows and planes, in good agreement with experimental "blocking patterns" (Nelson 1967a). Transmission patterns also revealed a lack of large-angle scattering parallel to close-packed planes, analogous to the white arms observed experimentally with thinner crystals.

scholarly journals Charge loss experiments in surface channel CCD's explained by the McWhorter interface states model

Physica B+C ◽  
1985 ◽  
Vol 129 (1-3) ◽  
pp. 301-305
Author(s):  
R.G.M. Penning de Vries ◽  
H. Wallinga
Keyword(s):  
Interface States ◽  
Charge Loss
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