[Isotope-prod] Possible irradiation design

[Hari Areti]

Dear all, 

Since we have good simulations from Joe Guebeli, I would like to keep Joe's work as 
the main thrust. However, since this is an R&D proposal, I will include Pavel's idea as 
something that we will evaluate. 

Thanks. 

-H 



From: "Andrew Hutton" <andrew at jlab.org> 
To: "Pavel Degtiarenko" <pavel at jlab.org> 
Cc: "isotope-prod" <isotope-prod at jlab.org> 
Sent: Monday, June 13, 2016 5:42:07 PM 
Subject: Re: [Isotope-prod] Possible irradiation design 

Pavel 

I like the design. The last beryllium plate could also be a vacuum window so that the target is in air. It would make the target handling easier. 

Nice idea. 

Andrew 

> On Jun 14, 2016, at 6:28 AM, Pavel Degtiarenko <pavel at jlab.org> wrote: 
> 
> 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 
> <Picture1.png><High Power Gamma Irradiator.pdf>_______________________________________________ 
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