[Solid_baffle] [Solid] revised draft agenda for SoLID collaboration meeting 5/14-5/15

[Zhiwen Zhao]

The things I see affect baffle design
0. physics (event generator, background estimation, trigger design)
1. magnet geometry and field
2. target chamber. We assume 1st plane of baffle is now inside of target chamber, because it's too 
close to target.
My guess is this makes it very hard or impossible to adjust for alignment once installed. I think 
target chamber
doesn't want it there either if it's an option. So if new baffle design can make 1st plane further 
away from target
to stay out of target chamber it would be best.
3. neutron shielding. we suppose it just fill space left for it. but in reality, maybe they need to 
be designed
and installed togther.
4. supporting. not just it's not easy to support, we may need the ability adjust things with good 
precision while
the whole thing is fully installed.
5. maybe more, I don't know

Zhiwen

On 5/12/2015 1:31 PM, Richard S. Holmes wrote:
>
> On Tue, May 12, 2015 at 12:48 PM, Zhiwen Zhao <zwzhao at jlab.org <mailto:zwzhao at jlab.org>> wrote:
>
>     About baffle parametrization, we certainly need to improved the current design using small blocks.
>     but the guideline can't be just reducing parameters.
>     I think we should really consider how it will be made or machined.
>
>
> The design and the parameterization of the design are two different things. For example, even if it
> were made using 20 layers of small blocks, the 20 block starting angles and 20 angular widths are 40
> parameters which presumably are not a minimal, robust set of parameters for the relevant degrees of
> freedom. I would guess, for instance, that the 8 or 10 coefficients of two cubic or quartic
> polynomials would adequately generate those 40 numbers, and there are other choices some of which
> probably would be better for optimization.
>
> But you are correct that machining considerations need to be reflected in a realistic design. (Of
> course machining considerations will depend on the materials we choose, based on simulations... so
> there will have to be some iteration to get to an optimized design.)
>
>     Other news about magnet, it will need to be changed!
>     hallA engineering gives us feedback that they need more iron for supporting
>     and SIDIS setup certainly now is too tight to fit everything in.
>     And we haven't cut holes for any cable out yet.
>
>
> Good point. Any other undefineds that would affect baffle design?
>
> --
> - Richard S. Holmes
>    Physics Department
>    Syracuse University
>    Syracuse, NY 13244
>    315-443-5977