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[lcdds 104] Re: [gld-eb 87] GLD baseline design : a cable space issue

Subject:   [lcdds 104] Re: [gld-eb 87] GLD baseline design : a cable space issue
From:   "yamamoto222-ee@xxxxxxxxxxxxxxxx" <yhitoshi@xxxxxxxxxxxxxxxx>
Date:   Mon, 1 Aug 2005 18:28:25 +0900

Dear all,

    The scheme given by Mark does seem to work for n-gonal shapes
other than octagon - it simply depends on the depth of HCAL+ECAL, it
seems. It can certainly be used for hexagon, but it may also be
possible for 10-gon.  Or am I dreaming?

   - Hitoshi






At 1:58 PM +0100 05.7.25, Mark Thomson wrote:
>Hi,
>
>I have just sketched out some VERY basic thoughts on
>cable space issues for the ECAL/HCAL. The main issue
>is where the barrel ECAL/HCAL cables go, either:
>   o at the end of the barrel which introduces a
>     (large?) gap between barrel/endcap
>   o at the sides of the barrel which allows one to
>     minimize the gap between barrel/endcap, but in its
>     simplest form doesn't work for 12-gon, 16-gon geometry.
>Some rather crude diagrams of the two options can be found
>in the .pdf attachment.
>
>To estimate the volume of cables at this stage is very hard
>indeed until we better know what is needed in terms of
>power supply, voltage control (a potential issue with SiPM/MPC)
>and readout.
>
>                       cheers,
>                           Mark
>
>
>
>
>On Mon, 25 Jul 2005, Tohru-Takeshita wrote:
>
>>  Dear Mark,
>>    yes, you're right. It seems to have another problem to
>>  place electronics for ECAL. We have to re-examine this
>>  in case we consider the 16-gonal structure in CAL detector.
>>   Sincerely,
>>     Tohru
>>  On 2005/07/22, at 17:00, Mark Thomson wrote:
>>
>>  > Dear Takeshita-san et al.,
>>  >
>>  > I think this is an interesting question...
>>  >
>>  > Clearly a 12/16-gon geometry has the advantage of a more
>>  > compact use of space. However, I am not convinced that one
>>  > can arrive at a realistic design. For an octagonal geometry
>>  > it is possible to readout the barrel on the outside of the
>>  > detector in the way LDC envisages. Going to 12+ sides this
>>  > no longer works. In this case we have to readout the barrel
>>  > from the ends. This may be OK - but I very much doubt we can
>>  > get the cables out without leaving a VERY large space between
>>  > barrel and endcap (perhaps I'm wrong). For this reason I don't
>>  > think we should consider making this the baseline design
>>  > without addressing these space issues.
>>  >
>>  > I'll try and circulate some diagrams later to illustrate what
>>  > I think are the main issues (and possible solutions).
>>  >
>>  >             cheers,
>>  >                            Mark.
>>  >
>>  >
>>  >
>>  >
>>  > On Fri, 22 Jul 2005, Tohru-Takeshita wrote:
>>  >
>>  >
>>  > > Dear Sugimoto-san and all,
>>  > >     I updated my GLD-CAL cut view for 12 and 16 -gonal (?) structure at
>>  > >  http://atlas.shinshu-u.ac.jp/jlc/GLD-design/gld-cal-design.html
>>  > >  Please look at them at "a whole detector view (12 or 16 gonal)".
>>  > >  Sincerely,
>>  > >    Tohru
>>  > > On 2005/07/21, at 15:40, Yasuhiro Sugimoto wrote:
>>  > >
>>  > >
>>  > > > Dear Takeshita-san,
>>  > > >
>>  > > >  In the slide you showed yesterday's meeting,
>>  > > > the number of layers in HCAL is 36 for the barrel region.
>>  > > > The total thickness including EMCAL and scintillators
>>  > > > is only 5.6 interaction lengths with this configuration.
>>  > > > It could be thicker if you adopt 12-sided or 16-sided
>>  > > > polygonal shape rather than octagonal shape
>>  > > > (octagon -> 5.6,    12-sided  -> 6.3).
>>  > > > How do you think?
>>  > > >
>>  > > > Y. Sugimoto
>>  > > > KEK
>>  > > >
>>  > > >
>>  > > >
>>  > > >
>>  > > >
>>  > >
>>  > > 竹下徹:信州大学:松本市旭3-1-1,0263-37-2898
>>  > >
>>  > >
>>  > >
>>  > >
>>  > >
>>  >
>>  > +---------------------------------------------------------------------+
>>  > |  Dr. Mark A. Thomson                 University of Cambridge,       |
>>  > |  E-mail: thomson@xxxxxxxxxxxxxxxxx   Cavendish Laboratory,          |
>>  > |  Phone:   44 1223 765122             (Room 951 Rutherford building) |
>>  > |        or 44 1223 762332 (College)   Madingley Road,                |
>>  > |  Fax:     44 1223 353920             Cambridge, CB3 0HE, U.K.       |
>>  > |  http://www.hep.phy.cam.ac.uk/~thomson/                             |
>  > > +---------------------------------------------------------------------+
>>  >
>>  >
>>  >
>>  >
>>  >
>>
>>  竹下徹:信州大学:松本市旭3-1-1,0263-37-2898
>>
>>
>>
>>
>
>+---------------------------------------------------------------------+
>|  Dr. Mark A. Thomson                 University of Cambridge,       |
>|  E-mail: thomson@xxxxxxxxxxxxxxxxx   Cavendish Laboratory,          |
>|  Phone:   44 1223 765122             (Room 951 Rutherford building) |
>|        or 44 1223 762332 (College)   Madingley Road,                |
>|  Fax:     44 1223 353920             Cambridge, CB3 0HE, U.K.       |
>|  http://www.hep.phy.cam.ac.uk/~thomson/                             |
>+---------------------------------------------------------------------+
>
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