The OPAL Discussion Forum

[Christof Metzger-Kraus <christof.j.kraus AT gmail.com>]

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, 

Christof 

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

From: peter pan <peterpn36 AT gmail.com>

Subject: tracking through alpha magnet

Date: 8 April 2020 at 23:17:51 CEST

To: opal-request AT lists.psi.ch

Hello,

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

TRIUMF

Vancouver

Canada