Re: before I forget

[Bernhard Lauss <lauss@berkeley.edu>]

Dear Peter,

we should do this test, but you should not forget,
that this changes the TPC conditions.

- primarily, the cooling power of the water is higher
with the current off, therefore the hydrogen volume will
be roughly 5 degrees C cooler and hence the density higher,
hence the signal gain is changed

In the last 2 runs this was the argument I think to have
the magnet also on during mu-, in order to have
comparable conditions with mu+.

So should we really run a full week for this test, or
is a single day with 5x10^8 statistics enough ?

We can also reverse the field direction (1/2 hours work),
which would not change the temperature.
However, this would change adding/subtracting environmental
fields from COBRA.

	     warm regards

		Bernhard




*******************************************************************
Bernhard Lauss                 E-Mail: lauss@socrates.berkeley.edu
Physics Department
366 LeConte Hall
University of California @ Berkeley
Berkeley, CA 94720                             Tel: (510)-642 4057
United States                                  Fax: (510)-642 9811
*******************************************************************

On Fri, 12 May 2006, Peter Kammel wrote:

> Dear colleagues,
>
> I would propose to continue until Wednesday with Bernhard's magnet
> on and then run one week with the magnet off. The motivation is that
> Dan observed some strange effects in the MuLan data, when the
> entrance field on the EMC was reversed which still need a
> quantitative explanation. I would not expect any change in
> MuCap, but better check.
>
> Let's discuss that in next Tuesday's telconf.
>
> Regards
>
> Peter
>
>