sPHENIX discussion of the superconducting solenoid

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

Hi,

 

The outlet temperature is now < 65 K and the drop is quite fast … Not sure whether the drop will be linear or not, my

multiplication/division tells me that at the latest (?) Friday, it’ll reach 4.5 K ….

 

 

  ************************           ************************

 

 

Below is the preparation and plan for the low-field test (after I walked around and talked to everybody, Dave, Sonny, Joe Muratore, Achim, Jesse …) :

 

This morning,

(1)   Sonny did and told me “The Power Supply leads are hooked up to the magnet and I left the Plug in the yellow LOTO lock box.” Dave put a “no operation” tag.

(2)   Paul Orfin told me that the Cryo group has installed the 2^nd heater so that both leads have heater to avoid frost.

 

Thanks to all of them …

 

  ************************           ************************

 

A few more things this week :

--- Achim Franz has promised to move his cart to the assigned location before Friday. 

--- And hopefully Fred’s guy (carpenter) will move the yellow scaffolding before Friday, too.   

 --- Dave would put the chain along the 5 G line around the magnet on Thursday.

 

 

ð  Friday (Mar. 18) 8-8:30 am, we’ll have the “Magnet Review” by Jesse Fite --- the time was picked as he needs to go to whole day seminar.

 

 

  ************************         ************************

 

Monday (Mar. 21): we’ll check out everything (hi-pot test, voltage taps etc.) … ( We have the “Traveller” written for this as you all know. ) Depending on situation, Joe will decide whether we’ll ramp the current to 100 A on Monday or wait for Piyush on Tuesday;

 

Tuesday (Mar. 22): to complete low field test (if not yet finished by Monday) and let Piyush test his Quench Detection …

 

Wed. : may not or may not be needed and then we have to decide when to warm up in the slowest way => naturally (drift) to 10 K as Piyush/Muratore

want to measure the resistance at 10 K.

 

 

  ************************         ************************

 

Let me know if you see anything wrong.  The above plan has been in my our mind for a long time and hopefully it’ll happen as we “plan”.

 

 

Kin

 

 

  ************************            ************************

 

 

PS: I kind of feel that the training of being “Scheduling Physicist” ~12 year ago was not completely useless … which at least makes me more confident

in making up bogus plan J

 

 

Attachment: 2016-3-15 17-37.JPG
Description: 2016-3-15 17-37.JPG