Re: Design drawings

[Alex Dzierba <dzierba@indiana.edu>]

OK - so just to bring everyone up to date ---

Tim and I just talked.  Before we did I found the attached drawing
by Eric that shows a tapered scintillator bar that has an active
length of 2 m, a width of 6 cm and a thickness of 2.54 cm.  The
ends are tapered to accommodate the XP2020 (2-in diameter)
and shielding.  Note Eric's units are inches.   The difference
now is to have a 2.52 m active length.  The two-wall structure
has a 12 cm x 12 cm hole with the center bars being less than
half-bars with readout at only one end for these bars.

w.r.t. the cell wall - our local conversations are to stay
with the same cell design used for E852 - two Al sheets
with holes and soft iron tubes in between.  But this can
revisited.

Matt and I will discuss more on Monday.

Cheers
Alex



At 1:34 PM -0400 4/13/07, Tim Whitlatch wrote:
>Hi Matt,
>
>We are happy to get some details worked out the FCAL and TOF. I have 
>a few questions for you concerning  the FCAL PMT support we spoke 
>about last month. Should we pursue the "screw in" pmt case?
>Also, the scintillating bars on the TOF are 252 cm long. Is there a 
>section of tapered cone from the bar to the pmt?
>Please call me at 757-269-5087 when you get a chance.
>
>Thanks,
>
>       Tim


-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Alex R. Dzierba
Chancellor's Professor of Physics (Emeritus)
Department of Physics / Indiana U / Bloomington IN 47405 / 812-855-9421
JLab Visiting Fellow
Jefferson Lab / 12000 Jefferson Ave / Newport News, VA 23606 / 757-269-7577
Home Phone: 812-825-4063  Cell:  812-327-1881  Fax: 866-541-1263
http://dustbunny.physics.indiana.edu/~dzierba/
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

1x2_35-taper.pdf