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

[Gerhard Randers-Pehrson]

Hi Barney
At RARAF we have a lockup system that includes very low threshold radiation
monitors in unshielded areas that scrams the machine if any radiation is
detected. It usually only trips when someone is moving a source around. 
Gerhard 

-----Original Message-----
From: sneap-bounces at tunl.duke.edu [mailto:sneap-bounces at tunl.duke.edu] On
Behalf Of Doyle, Barney L
Sent: Thursday, November 08, 2007 1:40 PM
To: Symposium of Northeastern Accelerator Personnel
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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