From: felix.budde@googlemail.com

Newsgroups: sci.physics.plasma

Subject: plasma ion source

Date: 5 Oct 2005 08:50:36 -0700

Organization: http://groups.google.com

Dear all,

I`m developing an UHV compatible plasma ion source with microwave

excitation. The main problem is that at high beam energies (anode

voltage up to 5 kV) there is an electrical breakdown of the gas to the

grounded feeding tube. I put an insulator in the gas capillary but at

the pressure, which I need, a glow discharge inside the insulation tube

starts. Has anybody an idea how to avoid an electrical breakdown at

high voltage (up to 5 kV) and low pressure inside an insulator in a gas

feeding tube? So far I found the idea of using magnetic fields or

porous insulators to suppress the glow discharge but that´s not a

simple or UHV compatible solution.

Thanks

Felix