[Sneap] Neutron doses at Tandems with deuteron beams ?

[Ulrich.Giesen at ptb.de]

Dear SNEAPers, 

here at PTB-Braunschweig/Germany we have a 35-year-old KN-3750 
Van de Graaff, which is well-maintained and still runs quite good. 
However, we have to start thinking about replacement and upgrade. 

We are currently considering a 3 MV or higher Tandem in the same vault, 
but the wall at LE-end would have to be reduced or replaced. 
Because we have to run deuteron beams for the production of neutron 
fields, 
we are now concerned about neutron production in/at the stripper canal and 

the resulting neutron doses at the LE-end. 
We realize that these will depend on the amount of deuterons already 
implanted 
in the stripper structures and on back scattering from the walls around 
the accelerator. 
We would wellcome any available data or experiences for neutron production 

with deuteron beams in a Tandem. 
  
Thanks in advance and best wishes for a pleasant meeting in Ann Arbor ! 

Cheers, 

Uli. 
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Dr. Ulrich Giesen
Working Group 6.41  "Microbeam and Ion Dosimetry"
Physikalisch-Technische Bundesanstalt (PTB)
Bundesallee 100
D-38116 Braunschweig
Germany
Tel.: +49 (0)531-592-6410    or  -6401,  Fax : +49 (0)531-592-6405
Email : Ulrich.Giesen at ptb.de         Internet: 
http://www.ptb.de/de/org/6/64/641
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