[PEPPo] positron capture magnet

[Probir Ghoshal]

Great Jay,
First hand look and my initial thoughts...!

  1.  10 A/mm^2 is not bad...
  2.  1.8 T seems optimistic, what impact does this have to physics with 1.7T ?
  3.  What are the space constraint(s)/limitations...?
  4.  What are the operating conditions viz environment (temperature)

Regards
Probir


Probir K Ghoshal, PhD.
Magnet Group Leader, Experimental Nuclear Physics
Jefferson Lab
600 Kelvin Drive, Suite #3, 55C
Room #2545, Newport News, VA 23606 (USA)

Telephone: 757 269 6702 (office)
Mobile: 518 334 3289
email: ghoshal at jlab.org


________________________________
From: PEPPo <peppo-bounces at jlab.org> on behalf of Jay Benesch via PEPPo <peppo at jlab.org>
Sent: Thursday, October 12, 2023 10:10 AM
To: peppo at jlab.org <peppo at jlab.org>
Subject: [PEPPo] positron capture magnet

I did a quick and dirty model of a water cooled copper capture solenoid
30 cm long with 30 cm IR and steel outside 20 cm IR.  In order to get
1.8 T peak I had to increase the current density to unacceptable levels
with 10 cm radial extent so that is 24 cm in the attached.  Current
density 1000 A/cm^2 in coil pack, that in the copper will be larger.
Steel is 15 cm thick and still well into saturation.  There's a 1 cm gap
between coil and steel.  Field at [0.0,-50] 1260 G, about a fifth of
what Andriy showed.  Default "good magnet steel" BH curve used. Field
will be a few percent lower if 6" cold rolled steel of easily available
grade is used.
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