Re: FCal

[whitey@jlab.org]

Hi Elke,

 The 3 main reasons for the support structure are to force the blocks
tight together so there is no gap between (tolerance can build up over 60
blocks across)and to hold the blocks in place against the force of the
cell wall against them (that keeps pressure on the cookie). Also, a
structure is needed to hold the TOF. We can probably still stagger and
keep the round shape.

I will speak with Dave Kashey about this matter.

Cheers,
Tim

>
> Dear Tim et al.,
>
> something to think about. On Saturday Curtis and I talked to the primex
> people and Ashot mentioned that the primes calorimeter is staggered with
> out supporting the lead-tungsten and lead glass blocks.
>
> The have quite some blocks and what i understood the calo weighs 8 tonnes.
> Mt question is why do we need a support structure for the FCal. Dave Kashy
> was involved in the design of the primex calorimeter, maybe we can talk to
> him ones on this issue.
>
> One reason why I'm asking is that there is the idea to reuse the Primex
> blocks for the inner part of the FCal. one thing is they are only 20x20
> mm^2 but the other issue is there might be an upgrade for the FCal to
> replace some of lead glass blocks with time with lead tungsten ones. so we
> would need a new cellular wall and so on and so on. Of course the
> staggering does not work for a round calorimeter, but do we need really a
> round one. Okay we have to think this over a bit.
>
> Cheers elke
>
>
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