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[Ext-GDE-68] CCB Response to BDS (Muon Spoiler) Change Config Request of Sep.8, 2006



Dear Colleagues,

I am announcing that the CCB response, with regards to the latest
Change Request for the Beam Delivery section, is now posted at -

   http://www.linearcollider.org/wiki/lib/exe/fetch.php?cache=cache&media=bcd:ccb-com-muon20060923.pdf

The change request was submitted by A.Seryi on Sep. 8, 2006.
It relates to reduction of muon spoilers to implement in the
BDS beamline.

The requester suggested Class 1 for this request, to which
CCB concurred after evaluation of the cost impact.

The summary CCB response is as follows -

1. CCB agrees that the cost change (in this case, reduction) expected from 
   this change request qualifies it as Class-1.
2. CCB agrees to adopt the proposed change request as is, for reasons 
   detailed in the Discussion Section of the CCB response that is
   available at the URI above.
3. CCB approval of this change request is contingent upon continuation of 
   detailed detector studies on their whole system, including both charged 
   particle trackers and calorimeters, to ensure that the occupancy due to 
   muons does not affect the high precision physics measurements.

Additional communication and reference materials are available for
viewing, under CCR #16, at

   http://www.linearcollider.org/wiki/doku.php?id=bcd:bcd_history

The new BCD text is available at

   http://www.linearcollider.org/wiki/doku.php?id=bcd:bcd_home

The following two are "all-in-one" files that incorporate the change
with with this request on the muon spoiler, together with updates from
the 14mrad/14mrad (Class-2) CR that was approved by EC on Sep.20, 2006
and the single e+ DR (again, Class-2) CR that was approved by EC
the same day.

   http://www.linearcollider.org/wiki/lib/exe/fetch.php?cache=cache&media=bcd:bcd.23sep2006.pdf
   http://www.linearcollider.org/wiki/lib/exe/fetch.php?cache=cache&media=bcd:bcd.23sep2006.doc

The BDS section (identical in contents) as a separate file is also 
available for easier viewing as

   http://www.linearcollider.org/wiki/lib/exe/fetch.php?cache=cache&media=bcd:bds.23sep2006.doc

With best regards,

- Nobu Toge (KEK, Accelerator Lab)
  email: toge@xxxxxxxxxxxx
  voice: +81-29-864-5224
  fax:   +81-29-864-3182