[Brahms-l] BRAHMS magnet control

Dear collaborator,

we have had over the last couple of days serious problems with the interaction
of our magnet D3 with DX.AS described in some below by Dana, this has been resolve so we can run where our physics program dictates.
The important change to note is

a) The magnets are ONLY to be controlled by the new interfaces on the rHIC control xterm interface.
b) Even though one can still get at the old/standard interface it should NOT be used since it has no built in protection against operator error.
c)It is slightly more cumbersome, but much more failsafe; please educate yourself in this usage.
d) I hope the user description/manul can be updated to reflect this change.
e) Are the any questions an uncertainty how to operate this please contact Hiro or me immediately.
(assuming you are in the counting house)

regards
    Flemming

"
They are:
1)D3 ps has hardware to limit the ramp speed to 60 seconds to full field.
2)The magnet software from Seth has been installed and all magnets will now be operated with it. This prevents changing the state of the power supply if it is not at zero. It also limits the ramp rate to a value of the full current divided by 120 sec. A ramp time is loaded at the time the magnet is operated. This means even if the ramp time was corrupted, it will be loaded with a new acceptable value.
3)The changes to allow for slow ramp downs on magnet interlocks will be implemented in a few weeks. I am told this was deemed acceptable by CA so that work can be done on the warm snake first.
4)The logs have been checked and there appears to be no recent trips of the D3 magnet. There has been almost no problems with this magnet/PS since its installation.
----------------------------------------------------------------
Flemming Videbaek
Physics Department
Brookhaven National Laboratory

e-mail: videbaek@bnl.gov
phone: 631-344-4106



_______________________________________________
Brahms-l mailing list
Brahms-l@lists.bnl.gov
http://lists.bnl.gov/mailman/listinfo/brahms-l