کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1825896 1027371 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Modelling and optimisation of ionisation gauges for magnetic nuclear devices
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم ابزار دقیق
پیش نمایش صفحه اول مقاله
Modelling and optimisation of ionisation gauges for magnetic nuclear devices
چکیده انگلیسی

We have developed a numerical tool that simulates the operation of an ionisation-based pressure gauge in the presence of magnetic field. In this paper we describe the physical model, the numerical implementation and the validation of the code against laboratory experiments using the so-called ASDEX pressure gauge. We then show how this modelling has led to a deeper understanding of processes associated with the presence of magnetic field in this type of gauge: sensitivity enhancement, sensitivity dependence on primary electron current and output saturation at high gas pressure. The combined electric and magnetic fields may trap electrons long enough so that they can spend all their energy in collisions with the neutral gas, thus increasing the sensitivity and leading to early saturation (with respect to the no B-field case). Although it seems difficult to avoid particle trapping with strong B  -field, the fraction of trapped electrons and the trapping time can be limited by careful tailoring of the electric potential in the gauge and thus creating E×BE×B drifts. This results in a modified sensitivity and saturation characteristic. Finally we show an example of a modified gauge which has an improved upper pressure limit in view of the next generation nuclear fusion experiment such as ITER.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 623, Issue 2, 11 November 2010, Pages 667–671
نویسندگان
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