Agenda/powerpoint files can be found in
https://indico.bnl.gov/conferenceDisplay.py?confId=3134)
In email, Jon Hock gave us histogram which showed a little progress in the return steel construction and told me on Tue. (May 23): “We fell slightly behind schedule last week.
We lost one man for 1 ½ days for maintenance and two men on Friday for vacation. I have not had the time to redo the MS Project schedule. Presently, I am helping Dave Phillips with the critical lift.”
The critical lift was to facilitate moving the Magnet Coil/Cryostat onto the base. Jon has hoped for the move to happen ~May 31-June 7.
In email, P. Rosas reported on the power supply (May 23) : “The voltage loop is good, the current loop is not working well with this load it oscillates, I will stabilize the loops
and continue on.”
In email, F. Toldo reported on the strain gauge connection (May 24): “There are 6 cables for me to make. I am currently finishing the 4th one now. I will be done with
all cables by the end of today or some time tomorrow.”
J. Muratore also told me in an email today (May 24) about this plan for writing the High-Field Test procedures : “I will have time to do this next week I think.” I talked to
him before and after the meeting.
Brian van Kuik told me that his Cryo Control Software for the High-Field Test is 90% done. There are added signals and there also now interlocks that we didn’t have for the Low-Field
test.
C. Schultheiss reported in the meeting that his front-board design and PCB are done and is in the stage to find a vendor to make 8 of them. We may need to decide on 3 days or
5 days or 10 days (depending on the price difference).
Roberto Than has made two presentations with P. Orfin’s assistance : The first one was about the Storage Dewar Test. He first reminded us about the Low-Field Test in Mar. 2016.
We shouldn’t treat the pressure etc. on the Piping and Instrumentation Diagram too seriously as it was just a screenshot before operating at 4K. We roughly saw ~1.3 bar and 4.6 K on the day of Low-Field Test on Mar. 21, 2016. On the 5th slide,
PT3304H was probably the pressure before coaxial cable and PT3334H was the pressure afterwards.
On the Storage Dewar Test done last week, they went to >1.8 bar and the Dewar still worked at that high pressure. They also successfully produced an environment like in the Low-Field Test. On the 6th slide, PT3313 H ~ 1.85 bar was the pressure
at the dewar.
We (again) discussed about the two modes of working their Cryogenic System in Bldg. 912. In the best scenario, if we can keep on using the “return to the plant” mode, we may be able to use the Cryo system during the day and the Cryo group may recuperate the
system in the evening, 5 days in a week. Otherwise, for the other “low pressure drop return” mode, at best, we can only work Mon., Wed. and Fri. We’ll how the Cryo system perform under loads.
Then, Roberto discussed about the “Cryo interlocks for the High-Field Test”.
I learnt the term “Tare flow” (40% of the design flow) which is the minimum flow that we ought to see when there is no load. ( Otherwise, the system may warm up. ) Roberto introduced the two modes, one is “permissive” which includes a set of parameters that
we ought to satisfy before we can ramp the power supply/magnet; whereas the other one is “interlock” which includes a set of parameters that ought to be satisfied at all time and any violation may trigger slow or fast discharge. Carl suggested that today’s
meeting was just the introduction of the parameters. He said that he’d put everything (including power supply and voltage taps from the magnet) together and have a review with J. Muratore, P. Joshi, P. Rosas and the Cryo group for all the parameters.
It’s not just whether we want to set the set point at 4.8 K or 5.9 K (for example). We have to decide whether we’ll have slow discharge or fast discharge when the set point is reached.
Roberto also mentioned that the LEReC booster cavity will soon start to be tested in Bldg. 912 and hopefully they’ll stop before we start
J
