sPHENIX discussion of the superconducting solenoid

[Achim Franz <afranz AT bnl.gov>]

Hi,

here is a reply from Wuzeng Meng about the field with no return yoke:

Achim, 

 Yes. I tried your Opera-2d model. If I re-set your magnetic material to Air (material =0; mu =1.0), then your new solution will give Bo around 1.25 T. 

 Wuzheng

and this was his reply for the 100A test:

Base upon the information provided by Achim, I confirmed that with the SC solenoids alone (without any magnetic materials), the central field is ~1.25 T @ 4596 A; and ~ 271 Gauss @ 100 A. 

Attached figure shows the B = constant contours if the axis of solenoids is aligned with Z-axis, and coils are powered to 100 Ampere only. The peak field is near the coil edges  (over 320 Gauss);  the 5-Gauss line intersects the Z- axis at +/- 660 cm, and intersects at general radius around 576 cm (due to cylindrical symmetry around common axis of 6 solenoids). 

Good luck for your 100 A test.
Wuzheng

Attachment: BaBar_sole_B-contour.pptx
Description: application/vnd.openxmlformats-officedocument.presentationml.presentation

I'll run my model with 1000A and see what I get for the field valies.

Achim

On Oct 13, 2014, at 18:42 , Gupta, Ramesh C <gupta AT bnl.gov> wrote:

Yousef
Thanks.
Do you have the details of the iron in the original design?
Best regards,
-Ramesh
gupta AT bnl.gov
www.bnl.gov/magnets/staff/gupta
Sent from my Windows Phone

---

From: Makdisi, Yousef I
Sent: ‎10/‎13/‎2014 6:37 PM
To: Anerella, Michael D; Haggerty, John; sphenix-magnet-l AT lists.bnl.gov
Cc: Gupta, Ramesh C
Subject: Re: [Sphenix-magnet-l] Higher current test

Hello Mike,

   Thanks I stand corrected. That is why we added the idea that we need a
simulation (Ramesh's).

Yousef

On 10/13/14 9:03 AM, "Anerella, Michael D" <mda AT bnl.gov> wrote:

>Yousef,
>Just to be clear - I said the forces should not be higher without iron.
>Ramesh of course is the expert and has since made some estimates.
>Regards,
>Mike
>
>
>
>
>-----Original Message-----
>From: sphenix-magnet-l-bounces AT lists.bnl.gov
>[mailto:sphenix-magnet-l-bounces AT lists.bnl.gov] On Behalf Of Makdisi,
>Yousef I
>Sent: Friday, October 10, 2014 1:26 PM
>To: Haggerty, John; sphenix-magnet-l AT lists.bnl.gov
>Subject: Re: [Sphenix-magnet-l] Higher current test
>
>Hello John,
>
>    Mike Anerella had a brief discussion on this issue. Mike thinks with
>no steel, there is minimal forces on the coils. But he fringe field in
>the area could be the problem.
>    We were thinking that one can calculate the forces as well as the
>fringe fields to see the severity. Of course, then related issue would be
>the need for a high current power supply as well as quench protection.
>
>Regards,
>   Yousef
>
>On 10/10/14 1:18 PM, "John Haggerty" <haggerty AT bnl.gov> wrote:
>
>>I asked Pasquale what they did at Ansaldo to test the BaBar solenoid,
>>and I asked him about possibly coming to BNL for a day or two at some
>>point:
>>
>>> -------- Forwarded Message --------
>>> Subject: Re: BaBar
>>> Date: Fri, 10 Oct 2014 13:33:51 +0200
>>> From: fabbric <pasquale.fabbricatore AT ge.infn.it>
>>> To: John Haggerty <haggerty AT bnl.gov>
>>>
>>> John,
>>>
>>> so, very soon, you will have the coil in your lab. That's very good.
>>>
>>> Coming to the test, we did a partial test at Ansaldo without the iron
>>>yoke.
>>> The current was limited at 1/3 of the nominal current just for
>>>avoiding  problems with magnetic forces. However some not negligible
>>>fring field  was present (you need a large area around the coil  free
>>>of magnetic materials and limited access)..
>>>
>>> Next year I will have to go to Fermilab. If you inform me about your
>>>plans  I can try to couple visit to Fermilab with a visit to BNL
>>>
>>> Best regards
>>>
>>> Pasquale
>>>
>>> --
>>> Dr. Pasquale Fabbricatore
>>> INFN Sezione di Genova
>>> via Dodecaneso 33, 16146 Genova Italy Direct tel  + 39 010 3536340
>>> Laboratory  + 39 010 3536437 Secret.fax  + 39 010 313358
>>> E-mail   pasquale.fabbricatore AT ge.infn.it
>>> WEB page  http://www.ge.infn.it/~fabbric/
>>
>>-- 
>>John Haggerty
>>email: haggerty AT bnl.gov
>>cell: 631 741 3358
>>
>>
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