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 - > +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+ > >
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