[Halld_src] [EXTERNAL] Fwd: [Cuga] Start of the Experimental Program- a message from Rolf Ent and Camille Ginsburg for the Nuclear Physics Experiment Scheduling Committee (fwd)

[Or Hen]

For those that might have missed this (ARC10 = Hall D).

We are projecting the begin of physics to be around
August 26-27 instead of August 23 for Halls B and C. The situation to get
parts in to make ARC10 functional is uncertain and we expect to give an
update on the Hall D schedule in 1-2 weeks. Hall A schedule is unchanged
(September 3).

 We should discuss tomorrow the impact etc.

Thanks,
Or
--
Or Hen,
Massachusetts institute of Technology,
Cambridge, MA 02139, USA.
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.hen-2Dlab.com&d=DwIFAg&c=CJqEzB1piLOyyvZjb8YUQw&r=66Sb4pp0d4diwFuNQ_jTiKyZDsB_FG2X3Hlmk9_wuSY&m=_ZCVEMfj4-PtKMEJFbOJ5iYjJ8q34DKUSb1VQExqFkE&s=L1E_wL96willqIc3dT4pzSuBYL2wOCSZ2vj2g9-AyGY&e= <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.hen-2Dlab.com_&d=DwIFAg&c=CJqEzB1piLOyyvZjb8YUQw&r=66Sb4pp0d4diwFuNQ_jTiKyZDsB_FG2X3Hlmk9_wuSY&m=_ZCVEMfj4-PtKMEJFbOJ5iYjJ8q34DKUSb1VQExqFkE&s=KYo15FeLcBK40SFqaQaoq5yfRwu41cqcVtkJQ6uVOs0&e= >



Begin forwarded message:

From: Eliezer Piasetzky <eip at tauphy.tau.ac.il<mailto:eip at tauphy.tau.ac.il>>
Subject: [Cuga] Start of the Experimental Program- a message from Rolf Ent and Camille Ginsburg for the Nuclear Physics Experiment Scheduling Committee (fwd)
Date: August 16, 2021 at 10:26:30 AM EDT
To: <hen at mit.edu<mailto:hen at mit.edu>>



---------- Forwarded message ----------
Date: Fri, 13 Aug 2021 12:17:04 +0000
From: Lorelei Carlson <lorelei at jlab.org<mailto:lorelei at jlab.org>>
To: "cuga at jlab.org<mailto:cuga at jlab.org>" <cuga at jlab.org<mailto:cuga at jlab.org>>
Subject: [Cuga] Start of the Experimental Program- a message from Rolf Ent and
   Camille Ginsburg for the Nuclear Physics Experiment Scheduling Committee


The Scheduled Accelerator Down (SAD) period is coming to an end and machine
restoration is in full progress. A 1st-pass tune beam has made its way
through the two linacs and two arcs into a dumplet at the end of ARC2 at
1.82 GeV/pass, the first of the two energies scheduled for the period August
to December 2021.

Many systems were refurbished or upgraded during this SAD to improve the
overall machine reliability. Two well-known examples are the new 2K cold box
and the installation of two new cryomodules in the North linac - one of
them, the first of the new generation of C75 modules also uses a new
generation (3G) of low-level RF controls. Bringing these systems into
operation is going well and are mostly on  schedule. A place we are behind
schedule is in the restoration of the ARC box power supplies which power the
magnets to recirculate the beam.

During regular maintenance on these supplies an unexpected issue was
discovered with a key component that is common for all the ARC power
supplies. After consultation with the manufacturer it was determined that we
must replace these components to support the upcoming run.  The replacement
parts were a mix of spares and newly procured components. Unfortunately,
among the newly procured components were many that experienced early failure
and do not meet specifications.  We are working with the supplier and
manufacturer to evaluate the situation. Further, these components are now in
short supply in the marketplace due to global supply chain issues. With help
from many, we now have sufficient components to bring all the affected ARC
power supplies back into operation by August 22 except for ARC10, which is
necessary to bring Hall D into operation.



Tuning of the machine will take a few days after the ARC9 power supply is
available on August 22. We are projecting the begin of physics to be around
August 26-27 instead of August 23 for Halls B and C. The situation to get
parts in to make ARC10 functional is uncertain and we expect to give an
update on the Hall D schedule in 1-2 weeks. Hall A schedule is unchanged
(September 3).

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