Manouch, of course, is right. Try using this tune overnight, see what the rates are like, and see if any small adjustments can decrease the wire chamber scalers without significantly decreasing the Compton rate.
Karen
---------- Original Message ----------------------------------
From: Manouch Farkhondeh <manouch@mit.edu>
Date: Fri, 04 Jun 2004 16:55:53 -0400
>Today, a new SHR beam tuned was developed (L. Loncoy, Jan van der Lan,
>B. Franklin...) that is the best so far for satisfying both the Compton
>rates and the experiment with ABS. We may indeed be able to use this
>tune at all time as the wire chamber scalers rates and the BQM rates
>are reasonable even at 150 mA injected current.
>
>Karen (the current run coordinator) in her last email wrote:
>
>"".. If the tune is not clean enough for the experiment, more work
>may be done on the tune. We should be no more than 25% dead at the top
>of
>the fill, and the wire chamber scalers should read 20 or less at the top
>of
>the fill. If the tune is not satisfactory, we should ask to go back to
>the
>tune we had overnight.""
>
>I would like to REVISE her instructions by emphasizing that we should
>run at least for one shift to give this tune a chance and the
>chief/accelerator physicists to adiabadically improve the current tune.
>After a shift, if the tune seems intolerable we may only then decide to
>switch back to the previous tune we have been using.
>
>Manouchehr
>____________________________________________________________________
>Manouchehr Farkhondeh manouch@mit.edu
>Principal Research Scientist
>Division Head of Physics, Accelerator
>MIT, Bates Linear Accelerator Center tel (617)253-9298
>Middleton, MA 01949 fax (617) 253-9599
>____________________________________________________________________
>
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