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

[Jan N. Klug]

Doyle, Barney L wrote:

> 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.

You could use radiation detectors sending out a "radiation level too 
high" signal, which automatically turns in a cup at the low-energy end. 
A similar system is used at our lab.

Best Regards,

-jnk

-- 
Dipl.-Phys. Jan N. Klug
Ruhr-Universität Bochum
RUBION / Dynamitron-Tandem-Laboratorium
NT 05 / 130
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44780 Bochum, Germany

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