CAT
Chat Minutes
June 10, 2002
Information and Follow-up Items
It was announced that a new
spam filter is being added to the firewall. We are concerned of the impact and
lost mail that may result. We would
like to be better informed of upcoming changes.
The new spam filter is being installed for only the root APS
addresses (@aps.anl.gov), it will not affect any other addresses (such as
@xxx.aps.anl.gov). We will try to give
you as much warning as possible of upcoming changes that will affect your
network connections.
A front-end mask was
installed this past January for Sector 14-ID. But some realignment of components during the past shutdown also
affected this mask and caused delays in getting the beam down the beamline at
the start of our run. We would like to
know what happened.
A meeting was held with all of the parties to understand the
circumstances. It clarified the reasons
for the realignment, but also indicated that not everyone was aware of the
settlement issues in the beamline and all of the reasons for the
realignment. In the future, a meeting
with APS and affected CAT representatives will be held prior to any storage
ring realignment to discuss the scope of work and potential impacts.
During the last shutdown, the
control for the beamline vacuum isolation valves was switched from our control
to the APS. The information regarding this change was not widely distributed
within the CAT. How can I force this
valve to close?
The beamline isolation valve is now critical to the isolation of
the front-end and the beamline, since most of the exit valves are leaking. Therefore, the valve is controlled through
the front-end equipment protection system, but the beamline equipment
protection system should still have the ability to close this valve. We will review the current policy and
develop a strategy for the future as the leaking exit valves are replaced.
There have been numerous
problems with the air-operated cylinders used on most beamline shutters. I have heard contradictory statements on
whether the problem still exists or has been solved?
Malfunctioning seals within the cylinders caused most of the
problems. We have worked with the
manufacturer to develop a fix and now feel that the problem is being addressed
as the cylinders are outfitted with new seals.
A few recent problems were not related to seal failures, but were caused
by other mechanical problems with the shutter actuator.
The signs in the LOM windows
displaying the CAT name are disintegrating. Can they be replaced?
Contact your floor coordinator and we can have one made up for
you. We will investigate a long-term
solution and provide updated signs for all CATS.
User
Operations
During
the past week, five blocks of downtime occurred, primarily due to rf trips. Thus
far, the availability for the run is over 99.4% and the mean time between
faults is 30 hours.
On Monday, June 10, studies will take place for 48
hours followed by normal singlets in top up mode.
General
Information
Reinhard
Pahl thanked Glen Decker for identifying beam motion last week, which saved a
lot of downtime for Sector 15.
