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Shift report 14 Jan 2004 00:00-00:80
The main problem seems to be (see logbook discussion and
plot pages 49-50) the fraction of K+K-
around 20% at the beginning of our shift. This was traced back to
the morning of Jan 13, after magnet turn on.
We investigated this further, by plotting K+K- fractions
out of EventCountHistory.txt by So.
While until FINU00950 the fraction is
consistently 60%, afterwards it shows huge
variations down to 15%. Therefore we are now
running with this fraction
changing wildly. There seems to be a connection with
beam optics, tonight the fraction recovered from 16% to 53%
after some beam tuning. It is very important to monitor the fraction
after each run. A plot of the fraction should
be made available on a web
page.
Cheers,
Bianco, Camerini, So
----------------------------------------------
RUN START END EVNTS TRGR f_K+K-
1109 23:49 00:57 20000 HYP 17% !!!!!!!
1110 00:58 01:48 20000 HYP -- run stopped for DAFNE problems
1111 01:56 03:06 20000 HYP 53%
1112 03:07 04:21 20000 HYP 56%
1113 04:21 05:37 20000 HYP 53%
1114 05:37 06:56 20000 HYP LMDC 4o tripped during
injection
1115 07:02 07:31 15000 HYP.or.BHA
1116 07:33 in progress HYP
=========================================================
Dr.Stefano Bianco
Alte Energie - Laboratori Nazionali di Frascati dell'INFN
v.E.Fermi, 40 - 00044 Frascati (Roma) ITALY
ph. +39-06-94032793 fax +39-06-94032427