[Sneap] Deuterium valve

[Friedrich, Dr. habil. Manfred]

Dear SNEAPers,
our 2 MV single ended VdG is mainly used for RBS with 1.7 MeV helium
ions (He+).
Sometimes we need also deuterium ions. Unfortunately, the deuterium
inlet valve (thermic needle valve) cannot be completely closed at He ion
operation.
A low fraction of D in the He ion source gas has a strong disturbing
influence on the RBS results due to reactions of DD+ ions. 
Following we have removed the deuterium gas supply.
Does anybody know a safe closing type of valves?
Does anybody know a supplier for heated Pd valves?
M. Friedrich

Dr. Manfred Friedrich
Forschungszentrum Dresden-Rossendorf e.V.
Institute of Ion Beam Physics and Materials Research
P. O. Box 51 01 19  
D-01314 Dresden, Germany
Resident Address:
Forschungszentrum Dresden-Rossendorf e.V.
Bautzner Landstraße 128 (B6)
01328 Dresden
Phone: ++49 351 260 3284/3252      Fax: ++49 351 260 3285
e-mail:  M.Friedrich at fzd.de
http://www.fzd.de/FWI/FWII/