Experimental study of columnar recombination in fission chambers

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• 作者：P. Filliatre^a ; ^{philippe.filliatre@cea.fr" class="auth_mail" title="E-mail the corresponding author} ; V. Lamirand^b ; ^c ; B. Geslot^b ; C. Jammes^a
• 关键词：Electrical properties of gases ; Instrumentation ; Fission chambers
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2016
• 出版时间：1 May 2016
• 年：2016
• 卷：817
• 期：Complete
• 页码：1-6
• 全文大小：452 K

文摘

In this paper, we present experimental saturation curves of a small gap miniature fission chamber obtained in the MINERVE reactor. The chamber is filled with argon at various pressures, and the fissile material can be coated on the anode, cathode, or both. For analyzing the recombination regime, we consider a model of columnar recombination and discuss its applicability to our chamber. By applying this model to the data, it is possible to estimate the ratio between the recombination coefficient k and an effective column radius b  , appearing in the model, to be 29" class="mathmlsrc">View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168900216001595&_mathId=si0029.gif&_user=111111111&_pii=S0168900216001595&_rdoc=1&_issn=01689002&md5=3cd67c2d3b513624bed71fc4c22671a7">2" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0168900216001595-si0029.gif"> for argon. From these results, a routine measurement of the recombination regime is proposed in order to detect gas leakage. This online diagnosis would be beneficial in terms of lifetime and reliability of the neutron instrumentation of nuclear reactors.