sPHENIX discussion of the superconducting solenoid

["Yip, Kin" <kinyip AT bnl.gov>]

Agenda/presentation files can be found at : https://indico.bnl.gov/conferenceDisplay.py?confId=3224) :

 

1.      I’ve helped show Jon Hock’s histogram for steel construction progress. Jon has predicted that we’d move the Magnet to the steel base next week (or if not the week afterwards as Dave has added) .   D. Phillips has completed the pre-engineering lift paperworks, which is a kind of critical lift with the advantage that they don’t need to get approval from M. Gaffney again for the next Magnet lift.

Some time was spent discussing what to do after the Magnet is moved to the base.  Ray Ceruti has promised to try to coordinate with J. Hock, D. Phillips and B. Streckenbach (who has taken care of the ladders).  

Ray wants to check on the Magnet to make sure that everything is tightened appropriately.   He’ll check and adjust again when the Magnet is moved and start installing the Extension.

I understand that, to get the platform to be built for the Cryo group, after we install the Extension, we need to put the remaining end wall steel to cover (a part of) the Extension and then put the roof steel immediately on top of the end wall.  After that, D. Phillips can install the platform.

2.      Pablo Rosas reported on June 6 : “The PS is running in current mode after the modification, I am working on the controls to tie the PS and contactor, and the PET Page we may have next week. I would wait until we  have finished all the controls before moving it. A couple  of weeks.”

W. Pekrul took me to discuss with J. Morris about setting up the above-mentioned Pet page for Pablo next week to ramp the power supply now and during the High-Field Test.

3.      R. Meier and F. Toldo reported on June 6 that they have pulled all the Cryo/strain-gauge cables through the Extension, and terminated on both ends.

After inquiring, I understand from S. Dimaiuta that the voltage-tap cables had been pull through the Extension for a month now.

The J10-J12 connectors ordered is currently due on June 21 according to Kevin Rotunno @ KC Electronics.

 

4.      J. Mills conveyed Ed O’Brien’s request to gather any remaining purchases for the High-Field Test.

5.      A. Franz and J. Haggerty showed us the new magnetic probe that they’re going to use.  They have a plan to use a simple linear translation system to try to move the magnet among the axial axis to measure magnetic field at different positions.   ( See MagnetHighFieldTestProbes.pptx/pdf included in the indico page. ) They need to implement this quickly as the best time to install their probe is right after the Magnet is moved.

6.      Roberto Than reminded us that we still need to decide what to do for the interlock signals.  C. Schultheiss has promised a review which I need to remind him.   We’ve discussed a bit what to do.  It seems in general, all the Cryo interlocks should lead to slow discharge/ramp-down (via the freewheeling diode).    Real temperature rise would lead to fast discharge which would cause quench-back.

Peter Wanderer said again that we should have one fast discharge if it hadn’t happened “naturally” during our High-Field Test.