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[Ziyue Zhang <zzhan70 AT uic.edu>]

Hello all,

Yu's summary is very complete.

In short, and to answer Flemming's question, and a little supplement to Yu's summary:

1) PPBs are no longer overheated. This is fixed by connecting the tubes mentioned in part 1) of Yu's summary

2) Yellow alarms for the following modules:

    RDO1 disk1 module 3, 5
    RDO4 disk2 module 8, 10, 12

After some tricky operation on the cooling system, the alarms for RDO1 disk1 module 3, 5 went away, while those for RDO4 disk2 module 8, 10, 12 remained. Good new is by looking at the pedestal and noise plots, RDO4 disk2 module 8, 10, 12 are ok.

3) We have some unexpected tripped channels on MPOD03 (u2, u3, u4, u5). I tested them this evening, u4, u5 can be ramp up manually with very small ramp rate (10% of the original) and u2 u3 are just not stable with the original target voltage. u4 u5 can be fixed by further slowing down the ramp up procedure. u2 u3 will be investigated and discussed further tomorrow.

Best,

Ziyue

On Thu, May 11, 2023 at 4:55 PM videbaek <videbaek AT bnl.gov> wrote:

Hi Ziyue Zhang

Could you send a more detailled report to the FST list on the heating
issue on FST and what you learned today.At the 10 o'clock meeting the
conjecture was that one of the patch panels were overheating. Is this
still true?
Whereas the shift entry today seems to point to a cooling loop issue on
the disk 2

"We still get the yellow alarm on FST RDO 4, disk 2, module 8, 10, 12.
We will stop this run and start a new run to test."

best regards
Flemming


--
Flemming Videbaek
senior scientist, emeritus
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
Bldg 510D
Upton, NY 11973

phone: 631-344-4106
cell     :  631-681-1596
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