sPHENIX discussion of the superconducting solenoid

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

Just send this chain of emails for archiving.

Kin

-------- Original message --------

From: "Than, Yatming (Roberto)" <ythan AT bnl.gov>

Date: 5/27/21 07:28 (GMT-05:00)

To: "Haggerty, John" <haggerty AT bnl.gov>

Cc: "Orfin, Paul" <porfin AT bnl.gov>, "Yip, Kin" <kinyip AT bnl.gov>

Subject: Re: Magnet operation before Run 23

If everything goes according to plan, the LN2 system is supposed to keep the magnet at 90K if it stays inside the Detector Hall.

During the 4 weeks of 45K wave for RHIC we have the option to switch to 45K supply and get it colder than 90K.

When we start the RHIC 4.5K fill wave for the BLUE ring, we will have 4.5K helium and can start the solenoid cooldown.

R.

---

From: John Haggerty <haggerty AT bnl.gov>
Sent: Wednesday, May 26, 2021 11:25 PM
To: Than, Yatming (Roberto) <ythan AT bnl.gov>
Cc: Orfin, Paul <porfin AT bnl.gov>; Yip, Kin <kinyip AT bnl.gov>
Subject: Re: Magnet operation before Run 23

 

Thanks.  I think it would be a bad idea even if it were possible given
the breakneck commissioning period we have.

On 2021-05-26 16:34, Than, Yatming (Roberto) wrote:
> The  magnet does not get to 4K until RHIC is started its cooldown of
> 4K.
>  Pre-run Cryo: Scrub Dec 2022
>  Pre-run Cryo: 45K Wave Jan 2023
>
>  Run starts & Cryo-weeks count starts: Feb 2023 and 4.5K wave starts
> in RHIC
>
>  Week 1: RHIC 4.5K Fill and sPHENIX cooldown
>
>  There is no "starting ahead for sPHENIX"
>
>  R.
>
> -------------------------
>
> From: John Haggerty <haggerty AT bnl.gov>
> Sent: Wednesday, May 26, 2021 4:23 PM
> To: Than, Yatming (Roberto) <ythan AT bnl.gov>; Orfin, Paul
> <porfin AT bnl.gov>
> Cc: Yip, Kin <kinyip AT bnl.gov>
> Subject: Magnet operation before Run 23
>
> Paul and Roberto,
>
> We've started an exercise to figure out how sPHENIX will come on
> before
> Run 23 in February 2023.  A question we have is when we could hope to
> be
> able to cool down and energize the magnet before the run begins.
> Right
> now, we imagine that the magnet will be cooled down for mapping
> between
> April and July, 2022, and then be off until the run begins in February
>
> 2023.
>
> The question is, when could it come on before then?  January 2023?
> December 2022?  (There probably isn't much point in thinking about
> anything earlier than that because of all the installation activities
> that have to take place.)
>
> We're not looking for a promise at this point, just your best guess
> from
> what you know now.  Thanks.
>
> ---
> John Haggerty
> haggerty AT bnl.gov
> cell: 631 741 3358

---
John Haggerty
haggerty AT bnl.gov
cell: 631 741 3358