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Re: B field scaling for PANDA [message #7804 is a reply to message #7796] Tue, 03 February 2009 11:01 Go to previous messageGo to previous message
Lars Schmitt is currently offline  Lars Schmitt
Messages: 47
Registered: April 2004
Location: GSI
continuous participant
From: *gsi.de
Dear Stefano,

If you look at Jost's plot in his message it is clear that we need
something like 5 field calculations and then can make a linear
interpolation in between momenta for which the field was calculated.

I guess the most efficient way is to do the work in the initialization
phase and create a new map in memory from the two neighboring
maps calculated by Tosca. I don't believe (and Jost agrees) that one
can just take the function and scale from 15 GeV/c with it to any
value. The plot shown is just the field integral, but the actual field
is different in any given point of the map and can have a slightly
different behavior everywhere.

Coming back to the values: I made a mistake with J/psi. It should
be 4.06 GeV/c. For the higher value I propose either 11.91 (Ds(2460))
or 12.01 (Xi_c) with a slight preference for 11.91.

The 8.9 GeV is the end of electron cooling and the 1.5 GeV/c and
the 15 GeV/c are just the extremes we can have.

I would like to know Mohammad's opinion on this subject.

Cheers,

Lars


 
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