[Halld] Fwd: [New Logentry] Discussion of special running

[Mark Ito]

don't think this got through...sorry for the repeat if it did


-------- Forwarded Message --------
Subject: 	[New Logentry] Discussion of special running
Date: 	Sat, 26 Mar 2016 22:00:03 -0400 (EDT)
From: 	marki at jlab.org
To: 	marki at jlab.org, halld at jlab.org



  Discussion of special running <https://logbooks.jlab.org/entry/3392451>

Lognumber 3392451 <https://logbooks.jlab.org/entry/3392451>. Submitted 
by marki <https://logbooks.jlab.org/user/marki> on Sat, 03/26/2016 - 21:55.

Logbooks: 	HDLOG <https://logbooks.jlab.org/book/hdlog>
Entry Makers: 	Mark Ito

At the run coordination meeting on Friday, we discussed two proposals 
for special runs once the beam comes back.


      Zero-Field Running

Lubomir presented a proposal <https://logbooks.jlab.org/entry/3392044> 
for running at zero field, taking advantage of having the solenoid 
ramped down. There are several goals, and two sets of running 
conditions, one for four hours, one for two.

We agreed to go ahead with his plan. This will be done after initial 
beam quality checks.


      Tagger Quadrupole Test

Richard presented a proposal 
<https://halldweb.jlab.org/wiki/images/d/de/Quadrupolestudy-3-25-2016.pdf> 
for testing the effectiveness of the quadrupole upstream of the tagger 
magnet for focusing the electron beam on to the middle row of the 
microscope counters. For the proposed study the quadrupole will be set 
at the target current and a single row of the microscope will be turned 
on with the process repeated for each of the five rows. The estimate is 
that one hour of running per row should suffice.

We agreed to defer this running until after we re-establish and sustain 
normal production running (para/perp/amorphous runs) for a few days at 
least. This will allow us to confront any problems that may have crept 
in during the down-time as well as discuss details of the plan.



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