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Re: [Opal] OPAL-t element for 3D (static) fieldmaps


Chronological Thread  
  • From: Christof Metzger-Kraus <christof.j.kraus AT gmail.com>
  • To: "Dr. Simon Friederich" <s.friederich AT uni-mainz.de>
  • Cc: "opal AT lists.psi.ch" <opal AT lists.psi.ch>, "Adelmann Andreas (PSI)" <andreas.adelmann AT psi.ch>
  • Subject: Re: [Opal] OPAL-t element for 3D (static) fieldmaps
  • Date: Mon, 1 Mar 2021 11:19:28 +0100
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Hi Simon,

thank you for your update. I can confirm your assumption: the normalization requires that Ez on-axis (x=y=0) isn't zero everywhere.

Christof

On Mon, Mar 1, 2021 at 10:02 AM Dr. Simon Friederich <s.friederich AT uni-mainz.de> wrote:

Dear all,

Am 01.02.2021 um 09:54 schrieb Christof Metzger-Kraus:
Alternatively: If I chose 3DDynamic with only zero E-field columns but non-vanishing B-field, does this work as expected?

In case others might find this useful:

I tested it. 3DMagnetostatic does not work for RFCavity elements (yet), but 3DDynamic with Zero-E-field columns does.
Here an example of a steerer (dipole) field I've implemented:
steerer: RFCAVITY,  APERTURE = "circle(0.04)", L=0.09, Z=0.1,
    FREQ=1e-10,  // 3DDynamic as static field
    VOLT = 1e12, // Normalization must not be used (see annotation below), hence a high amplitude is needed
    FMAPFN="H-fieldmap_steerer_3DDynamic.t7";


Head of fieldmap file:

Important is here:
The first line in the fieldmap must contain "3DDynamic FALSE", otherwise OPAL won't run
(I guess, because of "Ex, Ey, Ez = 0", the algorithm can not normalize it).

Best regards
Simon




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