sPHENIX discussion of the superconducting solenoid

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

Hi,

This is a fringe field plot for the sPHENIX Magnet made by Wuzheng and sent to us on Mar. 4, 2019 :

https://collab.external.bnl.gov/sites/sPHENIX-Magnet/Shared%20Documents/Dr.%20Meng%20Wuzheng's%20calculations/Fringe%20field%20outside%20the%20sPHENIX%20Magnet.pptx

It gives you better idea of the field outside the sPHENIX Magnet.

Kin

On 3/21/19 1:00 PM, Kin Yip wrote:

Hi Paul,

>From page 17, the plot below (and other documents):
https://indico.bnl.gov/event/5190/contributions/24416/attachments/21054/28446/Software_and_Simulation.pdf

the level that ~3 m away from the beam center, it's in the order of magnitude 1 rad per year.

As I said on the phone, you guys need to prepare for your devices being hung/locked up (single-event upset), rather than complete damage --- I'm assuming no
instrument of yours would be damaged at 1 rad per year level.  You can typically just recycle the power of that instrument to solve the problem.  We have a couple types
of "AC-RESET" that can help you do this power-cycling (without resorting to network because network can be hung by radiation).  Tony Curcio is the expert who
uses a couple types of AC-RESET devices.  Otherwise, Ralph Schoenfeld also has one type of AC-RESET device.

As for magnetic field,  I include the recent magnetic field pictures in his powerpoint from Wuzheng's recent modelling.   You can see the magnetic field from his
colorful plots.

Kin

On 3/21/19 12:36 PM, Orfin, Paul wrote:

All,

 

Does a report exist defining the specification for radiation in and outside of the IP8 hall?  If not, we need to generate such a document. The document should define the levels expected at different points around the solenoid.  At a minimum, we need to estimate the levels at the solenoid valve box and the new IP8 cold box. This is important for us so we can determine a minimum requirement for radiation hardened equipment in IP8.  After speaking with Kin, he has requested a memo from John on this subject.  Kin will estimate a value for us when quoting and evaluating components in IP8.

 

Similarly, a magnetic field document should also exist. The impact should be low for cryogenic equipment since we saw no issues during the high power test.  However, unless it is listed, there is no way to design for it. 

Thank you,

Paul Orfin
Cryogenic Systems, Collider-Accelerator Department
Brookhaven National Laboratory
Building 1005S, MS 1005S, Room 220
Upton, NY 11973-5000
Telephone: (631) 344-2899
Fax: (631) 344-3329 
E-mail: porfin AT bnl.gov