[Isotope-prod] Optimization question

[Andrew Hutton]

Pavel

I like the idea.  However, we now need to stop inventing and focus on finalizing the proposal.  

When we get funding, we should look into all these ideas.  

Andrew

> On Jun 22, 2016, at 3:48 PM, Pavel Degtiarenko <pavel at jlab.org> wrote:
> 
> 
> I'd like to revisit one optimization question that was standing from the very beginning.
> 
> We assume presently that minimizing volume of the isotopically pure target is paramount in this problem and we have to design windows, radiators, and targets that would survive extremely high power densities, to the limits of impossible. But there might be an optimal overall solution, in which the target volume is few times larger than the absolute minimum. The target itself, and the Cu67 separation process would be more expensive (most likely less than linearly). But the cost increase would be compensated by avoiding risky and therefore expensive engineering solutions. So may be the optimum solution would be using larger diameter targets and windows that could be cooled easier. I would suggest to consider for the proposal finding the beam diameter that we know could be run safely, base all estimates on that, and include further optimization as one of the goals of the proposal.
> 
> One of the solutions to consider could be a circular beam rastering when beam position at the target goes in circles at a constant radius. The target does not fill the whole cylinder volume, but is placed in a cylindrical layer, say, 5-10 mm thick, with the core of the cell made of the same material as the whole cell. The Ga/Zn target volume then goes linearly (not quadratically) with increasing radius, so that might be a comfortable variant for the optimization.
> 
> Best regards,
> Pavel
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