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[bds 20] Re: luminosity requirements for e-e- option (fwd)




Hello,

Below are for every ones benefit a question on the luminosity requirement in the e-e- option and an answer with some information and a reference on what it expected to be achievable in e-e- as compared to e+e-.

Cheers,

Philip.

---------- Forwarded Message ----------
Date: samedi 11 dcembre 2004 10:13 -0800
From: "Woods, Michael B." <mwoods@xxxxxxxxxxxxxxxxx>
To: Bambade <bambade@xxxxxxxxxxxx>, Albert De Roeck <deroeck@xxxxxxxxxxxx>
Subject: RE: luminosity requirements for e-e- option

Hi, the achievable e-e- luminosity (corresponding to e+e- lumi in range of
2-3e34) is probably in range 3-6e33.  See, for example SLAC-PUB-10353,
http://www.slac.stanford.edu/pubs/slacpubs/10000/slac-pub-10353.html (also
e-Print Archive: physics/0403037).  Cheers, mike P.s. for this type of
discussion, I would think it beneficial to use the MDI forum?

-----Original Message-----
From: Bambade [mailto:bambade@xxxxxxxxxxxx]
Sent: Saturday, December 11, 2004 4:42 AM
To: Albert De Roeck; Woods, Michael B.
Cc: Appleby, RB (Robert)
Subject: luminosity requirements for e-e- option

Hello,
One specific thing which I wonder about and which could be addressed in the
physics options overview talk is whether it is as essential (given the
physics channels to be studied) to have the highest luminosity in the e-e-
option as for nominal e+e- operation. The reason why this can matter for
the design is that for e-e- luminosity stabilization, various biases from
beam-beam effects and for the extraction of the spent beam, e-e- tends to
be more difficult than e+e-, simply because with e-e- the beam-beam effect
change sign and defocus rather than focus the colliding beam. Cheers,
----------------------------------------------------------------------------
Philip Bambade       E-mail: bambade@xxxxxxxxxxxx
http://www.lal.in2p3.fr/recherche/delphi/bambade/
Home Institute:                                At CERN:
LAL, Campus Universitaire              Delphi Collaboration
pice 129,Bt.208,B.P. 34                 EP Division
F-91898 ORSAY CEDEX France     F-01631 CERN CEDEX
Tel. 0033-(0)1-64468370                   Tel. 0041-22-7676012
Fax. 0033-(0)1-69079404                  Fax. 0041-22-7823084
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---------- End Forwarded Message ----------



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Philip Bambade       E-mail: bambade@xxxxxxxxxxxx
http://www.lal.in2p3.fr/recherche/delphi/bambade/
Home Institute:                                At CERN:
LAL, Campus Universitaire              Delphi Collaboration
pice 129,Bt.208,B.P. 34                 EP Division
F-91898 ORSAY CEDEX France     F-01631 CERN CEDEX
Tel. 0033-(0)1-64468370                   Tel. 0041-22-7676012
Fax. 0033-(0)1-69079404                  Fax. 0041-22-7823084
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