[Esr-users] Hall A heat bubble causing disruption for ESR

[Jessie Butler]

Quick follow up: After looking over signals from our system my “best guess” at what happened to the right arm IOC is that we experienced some form of a power glitch. Jack was able to bring all systems back online (reboot) remotely so whatever caused the issue was no longer present. We were able the reboot the equipment remotely and because of this we did not access the Hall and opted to return to beam operations. We will continue to monitor our systems remotely and update if we see a change. If the problem returns we enter the Hall for a more thorough review of the equipment.

Sent from my iPhone

> On Jan 13, 2018, at 11:08 AM, Joe D. Wilson, Jr <jwilson at jlab.org> wrote:
> 
> The CLOG entry below has plot of the temperature bump from Hall A in
> comparison to other halls.
> 
> https://logbooks.jlab.org/entry/3512279
> 
> -----------------
> Joe D. Wilson, Jr.
> Cryogenic Operations Engineer
> 
> Jefferson Lab
> www.jlab.org
> 757-269-7722
> jwilson at jlab.org
> 
> 
> -----Original Message-----
> From: Esr-users [mailto:esr-users-bounces at jlab.org] On Behalf Of Jessie
> Butler
> Sent: Saturday, January 13, 2018 10:46 AM
> To: Christopher Perry <cperry at jlab.org>
> Cc: esr-users at jlab.org
> Subject: Re: [Esr-users] Hall A heat bubble causing disruption for ESR
> 
> The IOC for the right HRS in Hall A lost communication and was likely the
> cause of this issue. We have since rebooted the IOC and brought the right
> arm back online. We currently don't know what caused the IOC to lock-up but
> we (Jack, Andrew & Jessie) are still investigating it... All Hall A magnets
> have returned to normal liquid levels and lead flows. Sorry for the
> inconvenience. 
> 
> Thanks,
> 
> Jessie Butler
> Jefferson Lab
> Physics/Hall-A Work Coordinator
> 757-269-5544 
> 
> EXCELLENCE IS OUR STANDARD;
> PERFECTION IS OUR GOAL.
> 
> ----- Original Message -----
> From: "Christopher Perry" <cperry at jlab.org>
> To: esr-users at jlab.org
> Sent: Saturday, January 13, 2018 7:02:45 AM
> Subject: [Esr-users] Hall A heat bubble causing disruption for ESR
> 
> It looks like Right D1 at Hall A may have quenched (see attached
> graph)causing a heat bubble to return to ESR, which disrupted liquid levels
> in the other halls.  All liquid levels are recovering with the exception of
> the right dipole.
> 
> Chris Perry
> Mechanical Engineer
> Cryogenics Group
> Thomas Jefferson National Accelerator Facility
> 12000 Jefferson Ave, Newport News, VA 23606 cperry at jlab.org
> (757) 269-6157
> 
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