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Title: Pulse Saturation Effects In Cosmic Ray Vetoing

Abstract

The anticosmic veto system developed around the extended range HPGe detector is described. In order to maximize the vetoing effect in the low-energy Ge spectrum region, the Ge fast output was amplified and the subsequent CFD threshold was set above background ({approx}20 keV). The timing curve derived with this setup exhibited unusual features. Two peaks appeared at the distance of the 125 ns. The second peak appeared to be ''prompt'' on the position where the coincidence events from positron annihilation (22Na) occur. The apparently superluminal nature of the first peak is discussed in terms of saturation of the spectrum in the fast amplifier.

Authors:
; ; ;  [1];  [2]
  1. Department of Physics, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 4, 21 000 Novi Sad (Serbia)
  2. Faculty of Physics, University of Belgrade, Studentski trg 12-16, 11 000 Belgrade (Serbia)
Publication Date:
OSTI Identifier:
21057296
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 899; Journal Issue: 1; Conference: 6. international conference of the Balkan Physical Union, Istanbul (Turkey), 22-26 Aug 2006; Other Information: DOI: 10.1063/1.2733053; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; AMPLIFIERS; ANNIHILATION; ANTICOINCIDENCE; BACKGROUND RADIATION; COINCIDENCE SPECTROMETRY; COSMIC RADIATION; GAMMA SPECTRA; GAMMA SPECTROMETERS; HIGH-PURITY GE DETECTORS; KEV RANGE; POSITRONS; SODIUM 22

Citation Formats

Bikit, I., Mrdja, D., Veskovic, M., Forkapic, S., and Anicin, I. Pulse Saturation Effects In Cosmic Ray Vetoing. United States: N. p., 2007. Web. doi:10.1063/1.2733053.
Bikit, I., Mrdja, D., Veskovic, M., Forkapic, S., & Anicin, I. Pulse Saturation Effects In Cosmic Ray Vetoing. United States. doi:10.1063/1.2733053.
Bikit, I., Mrdja, D., Veskovic, M., Forkapic, S., and Anicin, I. Mon . "Pulse Saturation Effects In Cosmic Ray Vetoing". United States. doi:10.1063/1.2733053.
@article{osti_21057296,
title = {Pulse Saturation Effects In Cosmic Ray Vetoing},
author = {Bikit, I. and Mrdja, D. and Veskovic, M. and Forkapic, S. and Anicin, I.},
abstractNote = {The anticosmic veto system developed around the extended range HPGe detector is described. In order to maximize the vetoing effect in the low-energy Ge spectrum region, the Ge fast output was amplified and the subsequent CFD threshold was set above background ({approx}20 keV). The timing curve derived with this setup exhibited unusual features. Two peaks appeared at the distance of the 125 ns. The second peak appeared to be ''prompt'' on the position where the coincidence events from positron annihilation (22Na) occur. The apparently superluminal nature of the first peak is discussed in terms of saturation of the spectrum in the fast amplifier.},
doi = {10.1063/1.2733053},
journal = {AIP Conference Proceedings},
number = 1,
volume = 899,
place = {United States},
year = {Mon Apr 23 00:00:00 EDT 2007},
month = {Mon Apr 23 00:00:00 EDT 2007}
}
  • We recently published a detailed summary of our experimental and theoretical research on Ne-like Se x-ray laser line widths, and one of our conclusions was that collisional redistribution rates are likely to have an effect on the saturation behavior of the 206.4 A Se x-ray laser. In this paper we focus on the effects of collisional redistribution on x-ray laser gain coefficients, and discuss ways of including these effects in existing laser line-transfer models. {copyright} {ital 1994} {ital American} {ital Institute} {ital of} {ital Physics}.
  • We present here results of continued efforts to understand the performance of microchannel plate (MCP)–based, high-speed, gated, x-ray detectors. This work involves the continued improvement of a Monte Carlo simulation code to describe MCP performance coupled with experimental efforts to better characterize such detectors. Our goal is a quantitative description of MCP saturation behavior in both static and pulsed modes. A new model of charge buildup on the walls of the MCP channels is briefly described. The simulation results agree favorably with experimental data obtained with a short-pulse, high-intensity ultraviolet (UV) laser. These results indicate that a weak saturation canmore » change the exponent of gain with voltage and that a strong saturation lead to a gain plateau. These results also demonstrate that the dynamic range of an MCP in pulsed mode has a value of between 10^2 and 10^3.« less
  • We recently published a detailed summary of our experimental and theoretical research on Ne-like Se x-ray laser line widths, and one of our conclusions was that collisional redistribution rates are likely to have an effect on the saturation behavior of the 206.4 A Se x-ray laser. In this paper we focus on the effects of collisional redistribution on x-ray laser gain coefficients, and discuss ways of including these effects in existing laser line-transfer models.
  • We present here results of continued efforts to understand the performance of microchannel plate (MCP)-based, high-speed, gated, x-ray detectors. This work involves the continued improvement of a Monte Carlo simulation code to describe MCP performance coupled with experimental efforts to better characterize such detectors. Our goal is a quantitative description of MCP saturation behavior in both static and pulsed modes. A new model of charge buildup on the walls of the MCP channels is briefly described. The simulation results are compared to experimental data obtained with a short-pulse, high-intensity ultraviolet laser, and good agreement is found. These results indicate thatmore » a weak saturation can change the exponent of gain with voltage and that a strong saturation leads to a gain plateau. These results also demonstrate that the dynamic range of a MCP in pulsed mode has a value of between 10{sup 2} and 10{sup 3}.« less