sPHENIX discussion of the superconducting solenoid

[Kin Yip <kinyip AT bnl.gov>]

Hello,

From Roberto's email below (and after asking him all kinds of stupid questions), I understand that the operational test
for the Cryogenic System in 912 without sub-cooler  seems successful.   They emulated the condition (pressure of 1.85 bar)
that was needed for the operation of cooling sPHENIX Magnet last time in the low-field test.

Roberto told me that the storage dewar has a volume like 3000 liters but it's safe to use up to ~2500 liters. 

For the mode ("low pressure drop return") that consumes the most of He, 250 L/hr as Roberto told us, we can maintain ~10 hours continuously.

But for the other mode ("return to the plant"), which can be used for at least the initial setup (or even at 500 A ?), it can go on much longer
(2500/60 > 40 hours).

We have to see what the real environment will be in our real operation.  But it's likely that we may have to operate like 3 days a week,   Mon., Wed.,
Fri. in a week  as the cryogenic system may not be sustain our operation for 5 days in a row.     Just starting to think ......

Kin

-------- Forwarded Message -------- Subject: RE: [Sphenix-magnet-l] Brief Summary of sPHENIX biweekly meeting on May 10, 2017 at 902 conf. room Date: Tue, 16 May 2017 09:55:26 -0400 From: Than, Yatming (Roberto) <ythan AT bnl.gov> To: Mills, James A <mills AT bnl.gov>, Orfin, Paul <porfin AT bnl.gov>, Yip, Kin <kinyip AT bnl.gov>

 

We ran the test Friday with the Coax transfer line in the loop.

Plant liquefying into  Storage Dewar operating at 1.85 bar.

We got 6.5 g/s returning to the lowest pressure point possible, that is  largest differential pressure, which is basically duplication of what we did on low power test.

This is,  bypass the plant and return to compressor 1.03 atm suction via the 2K return warmup circuit. [it has very low pressure drop because it was engineered for 30 mbar flow]

 

Then we put the cold return into the cold end of the plant, since we did not have a flow meter on the cold return we had to check it somehow.

We were close to breaking even capacity wise, but this is without the current lead flow and thermal shield flow loading on the cryo plant, so in reality we are short by those 2 loads.

To measure flowrate on the flowmeter on the 2K return circuit, we duplicated the flow resistance by throttling a manual return valve on our sPHENIX return interface cryo lines.

Upstream of the throttling valve we tried to hold the same return pressure from the coax line, and hence duplicating the same flow resistance

We manage to measure 5.8 g/s.

 

It is good that we are able to run on the back end of the plant, since we load the system much less.

If we return the 6 g/s via the low pressure drop return, we consume close to 250 Liter/hr

If we return to the plant, we consume around to 50-60 Liter/hr from the storage dewar.

We will

But we will need to run test in 1 day and refill storage dewar over 2 days and test again over 1 day.

 

Last 2 plots is the March 23 2016 test.

I will put everything in powerpoint slides and resend

 

Roberto

 

 

 

 

 

 

 

 

 

    Roberto Than Cryogenic Systems, Collider-Accelerator Department
Brookhaven National Laboratory
Building 1005S, MS 1005S, Room 212
Upton, NY 11973-5000
Telephone: (631) 344-7165
Cell 631-487-6842 
E-mail: ythan AT bnl.gov

 

From: Mills, James A
Sent: Tuesday, May 16, 2017 8:41 AM
To: Orfin, Paul; Than, Yatming (Roberto)
Cc: Yip, Kin
Subject: RE: [Sphenix-magnet-l] Brief Summary of sPHENIX biweekly meeting on May 10, 2017 at 902 conf. room

 

Good morning,

 

How are we making out with the test?  Any news to report? 

 

Thanks,

Jim

 

From: sPHENIX-magnet-l [mailto:sphenix-magnet-l-bounces AT lists.bnl.gov] On Behalf Of Yip, Kin
Sent: Wednesday, May 10, 2017 4:34 PM
To: sphenix-magnet-l AT lists.bnl.gov
Subject: [Sphenix-magnet-l] Brief Summary of sPHENIX biweekly meeting on May 10, 2017 at 902 conf. room

 

Agenda/powerpoint : https://indico.bnl.gov/conferenceDisplay.py?confId=3135

 

1.      Before the meeting, Paul Orfin told me “We just got the plant back up and running after several repairs that were made.”   In Paul’s absence, Roberto told us that Paul et. al. tested the system last week briefly and they had to abort (to presumably do the repair works).  Tomorrow and Friday, they’ll test again and hopefully it’ll verify that the entire cryo system works without the “subcooler”. 2.      A lot of works have been done in the return steel construction in 912 as you can see that the drilling/tapping has changed from 65% to almost ~80% in ~11 days.  Jon Hock and others kind of changed plan not to install the Magnet Cryostat first but instead try to finish the roof steel work (ie. to raise to the top and measure/transfer holes etc.) first.  Without going through his schedule (in MS Project), he estimated that the roof work and the end walls can be finished around May 31- June 7 such that we can then install the Magnet Cryostat.  J. Mills cautioned us that this might create delay and he’s asked Jon to figure out the exact delay.  Ed O’Brien (and others such D. Phillips) thought that Jon’s plan was probably the practical and safe way (working on the roof steels without the magnet underneath).

3.      P. Rosas told me on May 9, 2017: ““We had the PS up to 2700 amps into the dummy load open loop, we will be able to run the PS in voltage and then current loop this week and into next week. This is all been done in local control.”   [  “open loop” simply means “bypassing the regulator”, raising to the 2700 A without regulation, which also means that 2700 A was not really exact. ]

 

4.      Tom Tallerico showed us a few slides about the progress in the connection/cabling work which you may find in the indco page.  The kapton/TEFZEL cables and Dsub connectors have arrived.  Frank Toldo is starting to connect the strain gauge wiring.  Tom’s group will be responsible for the temperature sensor connections.  They all try to put the cables inside the “Extension” before the “Extension” is raised to the final position connecting with the Magnet Cryostat in Bldg. 912.  They’re also working on the controlled document for all the connections. 

Brian van Kuik is working on the PLC logic.

R. Meier would like to install the other two CERNOX RTD and they discussed with Ray Ceruti when they could do it.  Ray told Tom that they could in principle do it any time but they just need to coordinate with Joe Dambra.

 

5.      A. Franz said that they’d like to install their magnetic field probe right after the Magnet Cryostat is installed (to avoid having to climb up and down later).

 

6.      C. Schultheiss  reported that the PCB for his front-end board is almost done (if it’s not done already today).  They’re purchasing the components to stuff the board.

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