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Re: [Opal] Fwd: tracking through alpha magnet

Chronological Thread 
  • From: Christof Metzger-Kraus <christof.j.kraus AT>
  • To: Peterpn36 AT
  • Cc: opal <opal AT>
  • Subject: Re: [Opal] Fwd: tracking through alpha magnet
  • Date: Thu, 9 Apr 2020 09:12:27 +0200
  • Authentication-results: localhost; iprev=pass ( smtp.remote-ip=; spf=pass; dkim=pass header.s=20161025 header.a=rsa-sha256; dmarc=pass

Hi Victor,

OPAL-T can track particles through bends that bend more than 90 degrees. But it doesn't expect a quadruple to bend. However when you place the elements manually in 3D it should work. 

Could you send me your input file, then I can try to find out what goes wrong.

Best regards, 

Adelmann Andreas (PSI) <andreas.adelmann AT> schrieb am Do., 9. Apr. 2020, 08:14:

From: peter pan <peterpn36 AT>
Subject: tracking through alpha magnet
Date: 8 April 2020 at 23:17:51 CEST


after about three weeks of learning the code I really enjoyed it.
I am trying to track an electron beam through an alpha magnet
which has a field similar  to one of a half of a quadrupole.
I used a long qudarupole element supplied by Opal, turned it around y-axes
and shifted by some distance away from the x-axes. The beam is supposed to make a full turn
in the magnet and exit it at around 270-degrees. I monitor the reference trajectory in x,z plane.
It seem like the trajectory behaves well for the first half of the loop but then instead of completing
the turn, the reference particle suddenly makes a very quick move which is unphysical.
Could you please comment if I can simulate such a motion in Opal-t? Basically, the question is can I simulate
turns with any arbitrary angle >90-degrees?


I would appreciate any comment.
Thank you in advance
Victor Verzilov

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