Is the target spin abgle 45 degree or 48 degree? I understand that we are
running at 45 degree currently. Thanks,
Haiyan
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Haiyan Gao URL: http://www.tunl.duke.edu/~mep
Triangle Universities Nuclear Laboratory
Department of Physics, Duke University
Office: 426 TUNL Office Phone: (919)-660-2622
Email: gao@tunl.duke.edu Fax: (919)-660-2634
Mailing address: 426 TUNL Building
Science Drive
Box 90308
Duke University
Durham, NC 27708
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On Sat, 30 Oct 2004, Electronic Log Book wrote:
> Operator: akdogan
>
>
> Had some beam problems during the first hour of the shift. The WC scalers
> were around 100 at the top of the fill, reducing barely to 30 after 5 minutes or
> so, and injection was not as smooth. Requested to reduce the injection
> current from 170mA to 160mA, which seems to be working noticably better.
>
> Noticed that the ligit jumps periodically (see elog 30571) by a factor of
> two and returns to normal after a few minutes. And, just noticed that,
> rather curiously, this periodicity is in sync with the end of runs. The
> only effect that I can think of is the rungate. Does it effect the ABS?
> Or could it be because of some electronics cross-talk?
>
> Other than these, took ABS H2 data smoothly, with 48deg target angle.
>
> Had a few WC trips, and a few crate-1 trips.
>
> Beam polarization is at high 60s, close to 70% (note that the systematic
> error may be slighly higher than usual, which will be addressed during the
> next maintenance day). After, the laser&collimator scan the false asymmetry
> went down back to zero (0.0+-0.9% for the last 7 hours).
>
> Both left and right WC TDC spectra looks good/flat. The right sector has
> a little more background.
>
> All runs are being crunched. We should get better (lower error) target
> polarization results by tomorrow.
>
>
>
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