[Sbs] Cancelling A_LL experiment

[Mark Jones]

We were given an update on the status of the beam dump pump room area last night.
An optimistic estimate was that the work would take at  least two weeks. Given that
time frame, I had to cancel the A_LL experiment. The changeover to the GEn_RP experiment
is not simple and to give the GEn-RP experiment the best chance to successfully run
I felt that we could not delay the changeover any longer.

Thanks to everyone's hard work is getting the target and the
BB and SBS detectors ready for A_LL. It was a tremendous effort.
I fell bad about not being able to run A_LL, since it was another high rated experiment to complete
and all the effort that went into it.

At this point the GEN_Rp start will shift to the beginning of April.

Sincerely,
             Mark
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