Re: [BLAST_SHIFTS] Shift summary 02/23/2004 F (20-24)

From: Douglas Hasell (hasell@MIT.EDU)
Date: Tue Feb 24 2004 - 08:06:46 EST

I think periodic checks with the buffer system are a good idea.

But the resolution is due to the change in the timing I think. The new
t0's are 50 ns less than before and these changes have not been
incorporated into the crunch yet. The problem with introducing them is
two fold: 1, are we finished changing the time of the common stop?, 2.
with the current trigger there are not enough data in the right sector
to determine t0 for all cells.

If we are satisfied with the new coincidence window and the time of the
common stop then we should do a shifts or two with a different trigger
to get data in all cells from which the t0's can be determined.

                                                                         
                      Cheers,
                                                                         
                                      Douglas

26-415 M.I.T.
Tel: +1 (617) 258-7199
77 Massachusetts Avenue Fax: +1 (617)
258-5440
Cambridge, MA 02139, USA E-mail:
hasell@mit.edu
On Feb 24, 2004, at 7:18 AM, Bill Franklin wrote:

> Chi,
>
> It's interesting that you can observe degradation in the resolution
> from
> 1-2 hours of hydrogen data with modest flow rate. Perhaps we should be
> including an occasional unpolarized hydrogen run as a periodic
> systematic
> check. With the buffer system in reliable operation, it doesn't take
> too
> long to make the change.
>
> Bill
>
> On Mon, 23 Feb 2004, Electronic Log Book wrote:
>
>> Operators: adrian zhangchi shino
>>
>>
>> at 5pm, all 4 HV crates had to be power recyled.
>>
>> L21 guard wire tripped and kept tripping, Doug gave instructions to
>> recover that.
>>
>> D2 data takiing, smooth. had to deal with some trippings like usual.
>>
>> the two H2 runs after changing the timing coin window, show worse
>> angular and vertex resolution, 1.5deg now. Doug had an email pointing
>> out WC t0 shift.
>>
>>
>
> --
> **********************************************************************
> Wilbur A. Franklin * Phone: 617-253-9518
> Bates Linear Accelerator Center * FAX: 617-253-9599
> P.O. Box 846 * Email: wafrankl@mit.edu
> Middleton, MA 01949 *
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>

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