Multi-Cusp Plasma Device Basic aim: To confine contact ionized (tungsten surface) cesium ions in a multi-line cusp magnetic field and do its characterization. Expected Result : A 'text book' like ideal plasma, with Te~Ti, really quiescent, with only 'natural' fluctuations. Then ? : (i) Identify the real thermo-dynamic fluctuations and its sources. (ii) Now perturb the plasma with energy and particles and study the linear/non-linear evolving phenomena |
Old Classical Q-Machine Problem .. 'Drift' waves -low frequency electrostatic waves – propagates perp. B and dn Solution Could it be B ~ 0 in the centre... Cusp fields … |
Major Sub-systems Vacuum chamber - Chamber which can withstand the high temperature and with safety features for Caesium handling Magnet Assembly - Electromagnets with Vacoflux-50 core material and copper pipes as winding for water cooling option – being wound through outside vendor Hot-Cathode Ionizer - Tungsten hot plate with indirect heating from filaments behind – an old design from Chen Caesium Vapour Oven - Caesium capsules kept inside a heater – will deliver caesium vapour through small bore heated pipes Probe Diagnostics - Indirectly heated probe tips are necessary to avoid caesium condensation – also requires linear feed-throughs to work in hot environment |
Major Sub-systems – Vacuum Chamber
Vacuum Chamber
Basic Vacuum Testing Done;
Integration of sub-systems started
Major Sub-systems – Magnet Assembly
Requirement : Electromagnet with high curie temperature soft-core material. Status :
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Major Sub-systems – Hot Cathode Ionizer
Requirement : Indirectly heated Tungsten plate (with uniform heating) Status :
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Major Sub-systems – Caesium vapour oven
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Major Sub-systems – Probe Diagnostics
Status :
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Experiments planned
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