[Sneap] Active controls to limit current of high energy protons

[jim]

  Another way Barn is the use of a high speed rotating faraday cup, constant 
monitoring of the beam current would allow you to set limits that would 
close farady cups or shut down as appropriate Rad levels are not always the 
limit that you require to control it may not be a safety issue but machine 
issue.   Cheers Jim
----- Original Message ----- 
From: "Doyle, Barney L" <bldoyle at sandia.gov>
To: "Symposium of Northeastern Accelerator Personnel" <sneap at tunl.duke.edu>
Sent: Thursday, November 08, 2007 1:40 PM
Subject: [Sneap] Active controls to limit current of high energy protons


>
> As part of our new Ion Beam Lab (IBL) project at Sandia, a concern is
> being raised that, while we will have adequate rad shielding for nA
> currents of 10MeV protons, how do we prevent someone from increasing the
> current to a uA, and then the shielding is not adequate.  We have the
> same problem in our current lab, and just use administrative controls
> (i.e. the SOP limits the energy of proton beams from the tandem to 4.5
> MeV, and for higher energies, Rad Protection is called in and I have to
> be present).  Does anyone know of active engineering controls that could
> be used for this situation?  Any ideas out there?  This has to be a
> pretty common problem.
>
> -Barney
>
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