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Title: Theoretical and experimental investigation on magneto-hydrodynamics of plasma window

As a new device, plasma window has been designed to use plasma discharge to separate atmosphere from vacuum with high difference of pressure. It has many excellent properties, being able to be used as available passage for ion beam with negligible energy loss, also impervious to radiation damage and thermal damage. Normally beam focusing by accelerators is not that easy to achieve within channel of small cross section. 10 mm diameter plasma window's experimental realization could contribute to its further application in accelerator system. In this paper, 10 mm diameter 60 mm long plasma window has first been designed and managed to generate arc discharge with argon gas experimentally. The result proves that it has the ability to separate at least 28.8 kPa (not the upper limit) from 360 Pa with 50 A direct current and 2.5 kW power supplied. Current increase leads to linear inlet pressure increase obviously, while it has less impact on outlet pressure and voltage, coming to the conclusion that the higher current of plasma discharge, the larger pressure difference it creates. Theoretical analysis of 10 mm diameter plasma window in axis symmetrical configuration using argon also has been provided, in which a numerical 2D FLUENT-based magneto-hydrodynamic simulation model is settled. Itmore » has a good agreement with experimental result on voltage and mass flow rate when inlet pressure is increased.« less
Authors:
; ; ; ; ; ;  [1] ;  [2]
  1. State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 (China)
  2. Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
Publication Date:
OSTI Identifier:
22493856
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 23; Journal Issue: 1; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATORS; ARGON; CONTROLLED ATMOSPHERES; DAMAGE; DIRECT CURRENT; ELECTRIC DISCHARGES; ELECTRIC POTENTIAL; ENERGY LOSSES; EXPERIMENT RESULTS; FLOW RATE; FOCUSING; ION BEAMS; MAGNETOHYDRODYNAMICS; PLASMA; PLASMA SIMULATION; RADIATION EFFECTS; SYMMETRY; THEORETICAL DATA