[PEPPo] interesting solenoid article

[Robert Rimmer]

thanks Joe, this is interesting and timely. I was thinking it could be useful for our compact accelerators. I know periodic permanent magnetic focusing has been used for years on vacuum tubes and that KEK had installed weak PM "solenoids" in certain locations to counter electron cloud in super KEKB. I guess old CRT TV's also used permanent magnet beam focusing too. I guess the main concern for the positron target would be radiation hardness. I remember there was some interesting work done in the 90's (?) on "adjustable" permanent magnets using rotating blocks or magnetic material to mechanically adjust field strength. I think those may have been modified Halbach magnets. I wonder if anyone has made such an adjustable PM solenoid?
Bob.

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From: PEPPo <peppo-bounces at jlab.org> on behalf of Joe Grames via PEPPo <peppo at jlab.org>
Sent: Thursday, May 1, 2025 10:24 AM
To: ACCCIS Staff <acccis-staff at jlab.org>; peppo at jlab.org <peppo at jlab.org>; Reza Kazimi <kazimi at jlab.org>; Yan Wang <ywang at jlab.org>; Matthew Poelker <poelker at jlab.org>
Subject: [PEPPo] interesting solenoid article

Hi,

I thought I would pass along this article, perhaps especially interesting to those who of us who often used solenoids in the keV-MeV beam energy.

Joe

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