[Halld-controls] Hall D controls meeting on January 8, at 9:30am

[Hovanes Egiyan]

Hi,

I posted the minutes of the controls meeting on the wiki page:

https://halldweb1.jlab.org/wiki/index.php/Controls_Meeting_8-Jan-2015#Minutes

and also pasted them below.

Best,
     Hovanes.


    Minutes

Present: Dave, Mark, Scot, Hovanes


        [edit
        <https://halldweb1.jlab.org/wiki/index.php?title=Controls_Meeting_8-Jan-2015&action=edit&section=3>]
        Announcements

  * Yi will be leaving at the end of January. Hall D group needs to
    learn the slow controls subsystem that Yi has developed. Dave and
    Brian are looking into the PXI system for the solenoid.


        [edit
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        Gas system

  * Dave will be working on the gas system controls. Namely he will
    implement the communications between PLC and the Brooks controllers
    to be able to set the most parameters in the controller downstairs
    from PLC. We would like to be able to change the flow or to
    completely shut off the valves in the MFC in the hall from the hall.
  * Dave also suggested to have a NC solenoid valve for each FDC package
    so that we do not need to rely on the serial communications in case
    of emergency. It was pointed out that this is something that may
    trigger a review, the FDC group needs to make decisions on that.


        [edit
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        Remote reset of CAENs

  * Dave have plans for redoing the remote reset for CAENs without using
    5V output modules that currently kill the HV from CAEN each time PLC
    is rebooted.
  * This may require additional purchases of PLC equipment, Hovanes will
    ask Eugene about POA.


        [edit
        <https://halldweb1.jlab.org/wiki/index.php?title=Controls_Meeting_8-Jan-2015&action=edit&section=6>]
        Warm magnet power supplies

  * The procedures for TAG5C and SWEEP magnet ramping require approching
    the desired setpoint from above after staying near the saturation
    point for a while.
  * During the fall run we had incidents for both PS and tagger where
    the magnet currents were not raised to the *maximum* values before
    putting them at the nominal setpoint.
  * Accelerator magnets approach their desired setpoints from below
    after looping multiple times for degaussing, so the existing
    software does not accommodate TAG5C and SWEEP, but probably can be
    modified to execute our simple loop.
  * Hovanes will talk to Gary about making such changes.


      [edit
      <https://halldweb1.jlab.org/wiki/index.php?title=Controls_Meeting_8-Jan-2015&action=edit&section=7>]
      Solenoid controls work

  * Mark would like to have the correct time maintained on the solenoid
    power supply. He thinks the precision might be limited to 1sec by
    the power supply, but he will be check that.
  * Dave is planning to implement some mechanism by which the time will
    be transferred from PLC to the power supply either periodically or
    upon some condition being satisfied. He would like to have a PLC tag
    connected to EPICS that reports a correct time.
  * Hovanes suggested to use the time from EPICS/PLC interface IOC for
    the solenoid. He will send Dave the name of the tag, and Dave will
    take care of the conversion. Hovanes will also see if the server on
    which the production version of that IOC is running can be synced
    with JLab time servers.
  * Flow meters for the leads will be replaced by Scot.
  * Dave is considering a possibility of being able to stop a slow dump
    and ramping PS back to the setpoint. This might not be so easy, if
    not impossible, to do without going to the fast dump, according to
    Mark.
  * New liquid level sensor will be installed and needs to be integrated
    with the controls system.
  * Monitoring circuit for GFD is being worked on by Mark.


        [edit
        <https://halldweb1.jlab.org/wiki/index.php?title=Controls_Meeting_8-Jan-2015&action=edit&section=8>]
        More alarms

  * Mark will send Hovanes a list of LCW quantities which will be useful
    to have in the magnet section of the Hall D alarm system.
  * Scot suggested to have the hall humidities and temperatures in the
    alarm system as well. Hovanes will add them.


        [edit
        <https://halldweb1.jlab.org/wiki/index.php?title=Controls_Meeting_8-Jan-2015&action=edit&section=9>]
        Other items

  * Two more motors will probably be installed for April running: beam
    profiler in front of the collimator and the polarimeter target in
    front of the east wall of the collimator cave.
  * The specs for the polarimeter target motion system is still not well
    known, the details are coming in.
  * The stage for the beam profiler is being designed, the cabling is
    expected to be very similar to collimator and harps.
  * Target controls by the JLAB target group is pretty much done. They
    implemented the target controls in compact-RIO, but have an EPICS
    CA-server (or IOC) to interface it with Hall D EPICS. The target
    group needs a Windows PC in the counting house. we can share the
    halldsc7 that Dave is using for PLC with them. Hovanes will setup a
    meeting with the target group to work out the details of integration.
  * Scot reminded us that TAC motor needs to be tested. It has been
    locked-out/tagged-out during the last fall running. Hovanes will get
    together and check that the TAC stage is fine.



On 01/07/2015 09:48 AM, Hovanes Egiyan wrote:
> Happy New Year,
>
> We should restart having our regular Hall D controls meetings this week.
> We will have our Hall D  slow controls meeting on January 8, 2015,
> at 9:30am in A110. I posted the preliminary agenda on the wiki page:
>
> https://halldweb1.jlab.org/wiki/index.php/Controls_Meeting_8-Jan-2015
>
> The main topics of the meeting will be short updates on what each of
> us is working or will be working for the April engineering run.
> Please, feel free to add your topics for discussion to the agenda.
>
> Hovanes.

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