Re: Be-window

["Evgeny Maev" <maev@pnpi.spb.ru>]

  Dear Peter,

  Sorry for delay, but we had 4 days the holiday: 1 May- 4May.
  About your questions:
  1.Thickness window: Be-window is hemisphere with 50 mm
    diameter and difference between outer and inner radius
    0.5 mm (we will fax you the drawing). But the thickness
    along beam direction changes from 0.5 mm in centre
    up to 0.8 mm on the edge beam spot (on diameter 40 mm).
  For this reason, we propose to prepare special outer part
  from other material (mylar or plexiglas )that  compencate
  this difference and finally total thikness will be 0.8 mm.

  2. For estimation the properties of muon beam we used
     pencil beam with 3% FWHM momentum spread without any
     divergence. We used for Monte Carlo simulation the Srim
     code. I will prepare more detail report about this calculation.

     With best regards,
                       Evgeny



> Dear Evgeny,
>
> I will redo my old calculations as a check. A few questions:
>
> - Could you please send or fax (number below) me the PNPI technical
>   drawings of the windows! Is it 0.5 or 0.8 mm, you mention both
>   numbers below.
> - A can ask for a bit form a US companies, probably it is even more
>   expensive than your bid. But I would try.
> - Could you document your simulation a bit. I would then post it
>   on the webpage. In particular, what are the assumptions about the beam
> divergence?
>
> With best regards
>
> Peter
>
> On Wed, 30 Apr 2003, Evgeny Maev wrote:
>
>>   Dear Peter,
>>
>>  Now we finished the design Be window and
>>  have preliminary agreement with a company to produce
>>  these.  The prices are very high - 7000 US $ for
>>   4 Be windows ( Be hemisphere of 50 mm in diameter
>>   and with 0.5 mm thickness  with flanges)
>>
>>    I and Oleg made some estimation for Be and Havar
>>    windows using Srim code for MC simulation.
>>   Our conclusion for Havar(0.1 mm ) and Be ( 0.8 mm )
>>   with constant thickness along beam direction is :
>>
>>   Be-window gives as about 35% more muon stops than
>>   Havar window.
>>
>>   It will be very useful  if you inform us about your
>>   estimation and remarks concerning these windows.
>>
>>   With best regards,
>>                      Evgeny
>>
>>
>>
>> --
>> Dr.Evgeny M. Maev
>> Serious scientist
>> High Energy Physics Department (HEPD)
>> Petersburg Nuclear Physics Institute (PNPI) - http://www.pnpi.spb.ru/
>> Tel.: +7(81271)46191
>> Fax.: +7(81271)30010
>> Post Address: Russia, 188300, Gatchina,
>> Leningrad district, Petersburg Nuclear Physics Institut (PNPI)
>>
>>
>
>
> Peter Kammel  /  pkammel@uiuc.edu
> Department of Physics, Loomis Laboratory
> University of Illinois at Urbana-Champaign
> 1110 West Green Street, Urbana, IL 61801
> Tel (217) 333-5424 / Fax (217) 333-1215


-- 
Dr.Evgeny M. Maev
Serious scientist
High Energy Physics Department (HEPD)
Petersburg Nuclear Physics Institute (PNPI) - http://www.pnpi.spb.ru/
Tel.: +7(81271)46191
Fax.: +7(81271)30010
Post Address: Russia, 188300, Gatchina,
Leningrad district, Petersburg Nuclear Physics Institut (PNPI)