Feature #823

install pneumatically operated Proton Absorbers

Added by Coney, Linda over 12 years ago. Updated almost 9 years ago.

Beam Line
Start date:
14 December 2011
Due date:
15 September 2013
% Done:


Estimated time:
72.00 h


Current manual Proton Absorbers will be replaced by a system that is pneumatically operated and can thus be controlled remotely from the MLCR.

The hardware for the new system is being developed. Likewise, the software for the new system needs to be developed. It is not currently ready and is not a high priority.

The new system will be installed in the Hall around May - the deadline for this work is set accordingly.

Will assign to the MOM, but the software falls under C&M (Pierrick) and the hardware is Geoff Barber.


Updated by MOM, Mice Operations Manager over 12 years ago

  • Category set to Beam Line

The hardware is ready, so waiting on control software prior to installation.

Note that the MICE Hall (therefore DSA) may well be inaccessible during the next shutdown - so this may be delayed until the June shutdown.


Updated by Coney, Linda almost 12 years ago

  • Due date changed from 01 May 2012 to 01 February 2013

Software for the new pneumatic proton absorber C&M is now scheduled to be completed by 1 November 2012.

Installation of the hardware can proceed after that during one of the ISIS shutdowns. Given the ISIS schedule, it is likely that the longer shutdown from end of December to the beginning of Feb 2013 will be the most appropriate time for the installation.


Updated by Hanlet, Pierrick about 11 years ago

  • Estimated time set to 24.00 h

Failed attempt to complete control system for PA; we were given bad advice regarding the capability of hardware kit that we purchased. Have a new plan and new kit (24V relay board) is being delivered to Fermilab. With Andy, we developed a plan for the installation and I requested tests of the PA hardware before installation into the DSA.


Updated by MOM, Mice Operations Manager about 11 years ago

  • Due date changed from 01 February 2013 to 15 September 2013

A crude test of the PA cylinders has been made.

Outstanding high-level sub-tasks are:

  • make a complete installation drawing, inc. survey nests, pipe runs, safety guards, etc. (G Barber)
  • put everything together into a test stand and ensure it all works reliably (???)
  • laser survey on test stand to locate PA axis w.r.t. survey nests (H Nebrensky/J Palin)
  • provide a summary presentation on what/where/how for comment/information to other Hall users (???)
  • connect into building air - follows #1260 (as that gauge is upstream of PA kit) but not necessarily required for test stand (G Barber)
  • after all above complete: final installation, synchronised with DS survey

Updated by Nebrensky, Henry about 11 years ago

  • Estimated time changed from 24.00 h to 72.00 h

Detailed state of play, as of April:

From: Henry Nebrensky
Sent: 19 April 2013 13:17
To: Geoff Barber
Cc: Nichols, Andy (STFC,RAL,TECH); Pierrick Hanlet; Courthold, Mike (STFC,RAL,TECH)
Subject: Proton absorber air


I yesterday checked with Geoff - it looks like the absorber actuators can use building air. We had a quick look in the Hall - there's a connection to the building air in the trench, opposite the shelf by the duct into the DSA.

Proposal is that

  • valve island goes on shelf
  • air lines run from there through duct, then up inside of DSA wall and across to the absorbers roughly where the wires are now
  • electricians will need to break the spur used for sensors and add another socket for power
  • run compressed air over ceiling to valve island

Pierrick/Mike: as we are tapping into the building air supply, this could be a good opportunity to put in that monitoring gauge mentioned at the online group meeting. Please can you identify something suitable for remote readout into EPICS? [This is #1260]

Thus we need to have

bldg air supply -> monitoring gauge -> shut-off valve -> proton absorber regulator and so on.

I've left the survey nests on the proton absorber assembly. The proton absorbers can be installed either way round, but the survey nests must go on the South side.

The plan is to use the survey system to locate the aperture axis of the absorbers relative to the survey points; the whole system can then be placed its correct location by using the laser tracker to monitor the survey points during installation rather than the apertures themselves.

The initial survey probably requires that the entire proton absorber system can be operated on a test stand somewhere, as presumably the rest position of the slabs will depend on the pistons and limit switches, rather than where we can push them to by hand.

Also need to make sure that there is enough adjustment in how the proton absorber assembly is fixed - this may affect also the mounting of GVA1.

Finally, note that the downstream end of the Decay Solenoid MUST be surveyed after the old absorbers are removed, and before the new ones replaced, as that's the only opportunity to get access.




Date: Sun, 21 Apr 2013 20:15:22 +0100
From: Andy Nichols
Subject: RE: Proton absorber air

Thanks Henry,
Do we agree that's a plan then? Geoff is making the installation drawing, so this should be reflected in that. We need the positions of the valve bank, how it's fixed, the air fittings need to be specified, as does the pipe and the pipe runs. We also need a dimensioned location for the absorber body itself.
We won't be installing anything till we have the drawing - I guess it'll be next shutdown now.



Updated by Rogers, Chris almost 11 years ago

  • Assignee changed from MOM, Mice Operations Manager to Nebrensky, Henry

Henry, again I think this is a beamline responsibility not a MOM responsibility so assigned to you. Complain if it isn't.


Updated by Nebrensky, Henry almost 9 years ago

  • Status changed from Open to Closed
  • % Done changed from 0 to 100

The pneumatic PA assembly has been installed and surveyed, and restrictor valves installed to dampen the downwards movement.
Read-out and control panel exists.

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