Aging studies for the muon detector of HERA-B

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• 作者：Danilov ; M. ; Guilitsky ; Yu. ; Kvaratschellia ; T. ; Tikhomirov ; I. ; Titov ; M. ; Zaitsev ; Yu.
• 刊名：Nuclear Instruments and Methods in Physics Research Section A ; Accelerators ; Spectrometers ; Detectors and Associated Equipment
• 出版年：2003
• 期刊代码：41_01689002
• 类别：ph
• 出版时间：December 1, 2003
• 卷：515
• 期：1-2
• 页码：202-219
• 文件大小：1.15 M

摘要

The severe radiation environment of the HERA-B experiment leads to a maximum accumulated charge on a wire, within the muon detector, of 200mC/cmwire. For operation in this high-intensity environment, the main criteria for the gas choice turned out to be stability against aging. We report recent results of aging studies performed by irradiating aluminum proportional wire chambers filled with Ar/CF₄/CH₄ (74:20:6), Ar/CF₄/CH₄ (67:30:3), Ar/CF₄/CO₂ (65:30:5) Ar/CF₄ (70:30), CF₄/CH₄ (90:10) and CF₄/CH₄ (80:20) mixtures in three different experimental setups: laboratory conditions (⁵⁵Fe and ¹⁰⁶Ru sources), a 100MeVα-beam and the high-rate HERA-B environment (secondaries from interactions of 920GeV protons with target nucleus). Our experience shows that the aging rate depends not only on the total collected charge, but, in addition, on the mode of operation (high voltage and/or gas gain) and area of irradiation.