Re: dimensions

[Richard Jones <richard.t.jones@uconn.edu>]

I suggest a FAQ that summarizes our existing conventions regarding the 
geometry.  This question seems to recur once every few months.  Rather 
than repeating the answer in new words, I simply quote from the xml in 
the hdds repository, bearing a date from two years ago:

> <!-- Origin of Solenoid is center of the upstream edge of the first 
> coil -->

This definition also coincides with the downstream surface of the 
upstream mirror plate, if a mirror plate is used, but does not change if 
you add or subtract iron from the mirror plate, or even if it is removed.

This choice of origin predates my involvement, going back to Paul's 
first MCFast simulations.  I think it is a good choice, so let's all use 
the same coordinate system.

rtj

>
>Elton Smith wrote:
>
>Ravi also questioned the location of the origin, which we thought to be at the upstream edge of the magnet iron. However, this point seems to be
>inconsistent with some of the dimensions that Curtis gave. Ravi should
>check this out with Curtis.
>
>Cheers, Elton.
>
>--
>Elton Smith
>Jefferson Lab
>elton@jlab.org
>(757) 269-7625
>  
>