[Isotope-prod] Possible irradiation design

[Pavel Degtiarenko]

Hi All,
That might be too late for the proposal, but I think that this solution 
for the realistic 50 kW irradiation setup might work. I remembered my 
earlier US Patent, and I think it fits.
If we make the radiator as a 1 mm thick ~30 cm diameter tungsten disc 
and make it rotate in vacuum, we can avoid local melting in ~1 mA beams 
by spreading the heat along the circumference, and enclosing the 
tungsten disc in a cold copper envelope made of copper sheets. Radiative 
losses will be large at temperatures above 1000 C, so we can cool the 
disc effectively. The power will be transferred to the copper, and then 
taken away by the cooling water. There will be little need in beam 
rastering (may be some one-dimensional focusing may help a little). We 
may also set up the low energy electron filtering system after the 
radiator, made similarly out of beryllium discs. The filtering might 
help to take a significant portion of the low energy power (not 
producing isotopes) from the target, and thus make the target design a 
little easier. The target stays as it is now, the only difference is 
that it should be placed in vacuum. There will be need in a vacuum hatch 
to access the target samples.  I would guess it should be doable.
Best regards,
Pavel
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