Re: Chamber Infrastructure

[Elton Smith <elton@jlab.org>]

Hi Curtis,

Ravi already has shown some ideas for a rail system at our last 
collaboration meeting which has many of the design criteria you are 
looking for. We should not try to re-invent this wheel by every group that 
takes a look at it.

Cheers, Elton.




On Fri, 12 Mar 2004, Curtis A. Meyer wrote:

> Dear Eric, Dan and Elton -
> 
>    Gary, Zeb and I started talking about infrastructure for positioning and
> installing the GlueX chambers yesterday. One of he things that came out
> of this is that Gary (our technician building the chamber) is very reluctant
> to have anything like the forward chamber packages "attached" to the front
> end of the strawtube chambers. He was also very reluctant to have the cable
> bundles passing over the length of the strawtube chamber. 
> 
>     We then started to look discuss that we had thought that this would be the
> best way to accurately know where the chambers are with respect to each other.
> We then got to the rail system, and realized that if we had precisely located "stops"
> on the rails, we could accurately reproduce the chamber positions at least as
> well as we could do with the packages being attached, and possibly better. 
> Even if we had the forward chamber come out the down stream end of the 
> chamber, and the CDC come out the upstream end.
> 
>     At the moment, we are looking into a rail/positioning system that would allow
> for this, and allow us to accurately and reproducibly position the chambers 
> inside the magnet. We asre also contacting the Regina group about being able
> to attach precision rails to the calorimeter. What is coming out of this early discussion
> is that the current 5cm of space between the chambers and the caloriemters may not
> be quite enough for the rail system. We may need to look into increasing this to 
> about 7cm or so. 
> 
>      Once we get a reasonable estimate on the numbers, we will need to decide with
> the calorimeter group where this space comes from. Equally spilt, all from DC's or
> all from calorimeter.
> 
>        curtis
> 
> 

-- 
Elton Smith
Jefferson Lab
elton@jlab.org
(757) 269-7625