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Re: question to material in geometry
On Tue, 22 Jan 2008, Tim Whitlatch wrote:
Dear Tim,
thanks a lot. I think we have to see from MC what influences the rates
least. I would naively assume rohacel, but we should check.
I guess an other point for the MC-geom to do list.
cheers elke
> Date: Tue, 22 Jan 2008 11:33:40 -0500
> From: Tim Whitlatch <whitey@jlab.org>
> To: Elke-Caroline Aschenauer <elke@jlab.org>
> Cc: Richard Jones <richard.t.jones@uconn.edu>,
> Matthew Shepherd <mashephe@indiana.edu>, halld-mc@jlab.org,
> halld-me@jlab.org
> Subject: Re: question to material in geometry
>
> Hi Elke,
>
> A quick calculation shows a wall thickness of 4mm steel (the entire
> 45cm length) needed to keep deflections down below 100 microns.This is
> assuming a 2mm thick round tube inside a 2mm thick square tube. This
> will need to be made special. Some other design using rohacel machined
> flat and glued to a thin walled smaller tube may be possible.The rohacel
> would be muck thicker, but may buy us something.
>
> Tim
>
> Elke-Caroline Aschenauer wrote:
> > On Mon, 21 Jan 2008, Richard Jones wrote:
> >
> > Dear Richard,
> >
> > thanks for the answer. I think the best would be to put the material Tim
> > is intending to put to support the lead glas blocks. Tim some rough
> > numbers please?
> >
> > Thanks elke
> >
> >
> >
> >> Date: Mon, 21 Jan 2008 11:14:37 -0500
> >> From: Richard Jones <richard.t.jones@uconn.edu>
> >> To: Elke-Caroline Aschenauer <elke@jlab.org>,
> >> Matthew Shepherd <mashephe@indiana.edu>
> >> Cc: halld-mc@jlab.org
> >> Subject: Re: question to material in geometry
> >>
> >> Elke,
> >>
> >> There is currently no support material to hold the FCal blocks around
> >> the beam hole. I propose to add an iron sleeve of a new mm thickness.
> >> Matt, do you have a recommended thickness for that?
> >>
> >> Adding a helium bag down the beam line after the target is a good idea.
> >> I have it on my to-do list.
> >>
> >> Richard Jones
> >>
> >>
> >> Elke-Caroline Aschenauer wrote:
> >>
> >>> Dear Richard,
> >>>
> >>> I have a small question to the material in the geometry file.
> >>>
> >>> For the FCal beam hole do you have any material in there. Of course I mean not completely filled but some frame/tube is needed to support the blocks.
> >>>
> >>> One other question on the performance with the detector is if we would put a helium bag going from the end of the FDC through the empty cerenkov space to the tof, through the fcal to the photon beam dump.
> >>>
> >>> I can add this 2 items concerning geom-file on the wiki.
> >>>
> >>> cheers elke
> >>>
> >>>
> >>>
> >>> ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
> >>> ) `\ -
> >>> / '. | +
> >>> | `, Elke-Caroline Aschenauer =
> >>> \,_ `-/ -
> >>> ,&&&&&V Jefferson Lab +
> >>> ,&&&&&&&&: HALL-D 12C / F381 121-A Atlantic Avenue =
> >>> ,&&&&&&&&&&; Mailstop: 12H5 Hampton, VA 23664 -
> >>> | |&&&&&&&;\ 12000 Jefferson Ave +
> >>> | | :_) _ Newport News, VA 23606 Tel.: 001-757-224-1216 =
> >>> | | ;--' | Mail: elke@jlab.org Mobil: 001-757-256-5224 -
> >>> '--' `-.--. | +
> >>> \_ | |---' Tel.: 001-757-269-5352 =
> >>> `-._\__/ Fax.: 001-757-269-6331 -
> >>> +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+
> >>>
> >>>
> >>>
> >>
> >
> > ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
> > ) `\ -
> > / '. | +
> > | `, Elke-Caroline Aschenauer =
> > \,_ `-/ -
> > ,&&&&&V Jefferson Lab +
> > ,&&&&&&&&: HALL-D 12C / F381 121-A Atlantic Avenue =
> > ,&&&&&&&&&&; Mailstop: 12H5 Hampton, VA 23664 -
> > | |&&&&&&&;\ 12000 Jefferson Ave +
> > | | :_) _ Newport News, VA 23606 Tel.: 001-757-224-1216 =
> > | | ;--' | Mail: elke@jlab.org Mobil: 001-757-256-5224 -
> > '--' `-.--. | +
> > \_ | |---' Tel.: 001-757-269-5352 =
> > `-._\__/ Fax.: 001-757-269-6331 -
> > +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+
> >
> >
>
( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
) `\ -
/ '. | +
| `, Elke-Caroline Aschenauer =
\,_ `-/ -
,&&&&&V Jefferson Lab +
,&&&&&&&&: HALL-D 12C / F381 121-A Atlantic Avenue =
,&&&&&&&&&&; Mailstop: 12H5 Hampton, VA 23664 -
| |&&&&&&&;\ 12000 Jefferson Ave +
| | :_) _ Newport News, VA 23606 Tel.: 001-757-224-1216 =
| | ;--' | Mail: elke@jlab.org Mobil: 001-757-256-5224 -
'--' `-.--. | +
\_ | |---' Tel.: 001-757-269-5352 =
`-._\__/ Fax.: 001-757-269-6331 -
+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+