The OPAL Discussion Forum

[Daniel Winklehner <winklehn AT mit.edu>]

Hi Simon,

If you are interested in a single quad (doublet, triplet), you may be able to 
use OPAL-cycl for that. It quickly becomes unfeasible for longer beamlines, 
though, because diagnostics are designed for cyclotrons. 

In case you would like to try that, you can just create a midplane field map 
that consists of zeros (OPAL-cycl needs some midplane field file), then 
choose the BANDRF type cyclotron, and add your quad field as a 3D RF cavity 
field (those can be electric, magnetic, or electromagnetic and the frequency 
can be set really low, e.g. 1e-20, to mimic static fields).

If you would like to try this approach, send me an email off-list.

Cheers,
   Daniel

-----Original Message-----
From: opal-request AT lists.psi.ch <opal-request AT lists.psi.ch> On Behalf Of 
Chris Rogers
Sent: Monday, February 24, 2020 9:24 AM
To: opal AT lists.psi.ch
Subject: Re: [Opal] OPAL 3DMagnetostatic

I have been looking at multipoles (with a student), but using an analytical 
formula for the field expansion rather than a field map. Sorry!

Best wishes,
Chris

On 24/02/2020 13:48, Snuverink Jochem (PSI) wrote:
> Dear Simon,
> 
> Unfortunately, the hung mailing list problem seems to happen from time 
> to time with the ETH mailing lists.
> 
> To answer your question: it is currently not possible to have a 
> fieldmap for a quadrupole. Apart from the common attributes a 
> QUADRUPOLE has only the attributes, K1, DK1, K1S and DK1S. I am sorry 
> the example is a bug in the manual, we’ll correct it.
> 
> Perhaps someone (Chris, Christof?) knows a workaround?
> 
> Best regards,
> 
> Jochem
> 
> *From:*opal-request AT lists.psi.ch <opal-request AT lists.psi.ch> *On 
> Behalf Of *Simon Friederich
> *Sent:* Montag, 24. Februar 2020 14:16
> *To:* opal AT lists.psi.ch
> *Subject:* Re: [Opal] OPAL 3DMagnetostatic
> 
> Dear all,
> 
> Seems to be the mailing list was hung. Please ignore all mails from me 
> but the one attached (OPAL 3DMagnetostatic).
> 
> Sorry about that!
> 
> Best regards,
> 
> Simon
> 
> ------------------------------------
> 
> Dr. Simon Friederich
> 
> Helmholtz-Institut Mainz
> 
> Kollaboration B / ACID
> 
> Johannes Gutenberg-Universität Mainz
> 
> Staudingerweg 18
> 
> 55128 Mainz, Deutschland
> 
>   
> 
> Tel.: +49 (0)6131 39-23160
> 
> E-Mail:s.friederich AT uni-mainz.de  <mailto:s.friederich AT uni-mainz.de>
> 
> ------------------------------------
> 
> Am 23.02.2020 um 15:05 schrieb Simon Friederich:
> 
>     Dear all,
> 
>     Can someone please explain how 3DMagnetostatic fields can be
>     implemented
>     (by the way can they be implemented in OPAL-t yet?).
> 
>     E.g. I have this fieldmap of a quadrupole:
> 
>     cst2opal_quad_1Ax_xyz_rough.t7
> 
>     # Origin: cst_quad_1Ax_xyz_rough
>     # x,y,z in cm
>     # Bx,By,Bz in T
>     3DMagnetoStatic
>     -1.500 1.500 60
>     -1.500 1.500 60
>     -10.000 10.000 400
>     -2.56903e-05 3.9909599999999996e-07 1.26009e-05
>     -2.61039e-05 4.04632e-07 1.27818e-05
>     ....
> 
>     I tried using
>     QP1: Quadrupole, L=0.05, ELEMEDGE=0.5,
>           FMAPFN="cst2opal_quad_1Ax_xyz_rough.t7", K1=0.1;
> 
>     But despite the example entry in the wiki
>     (https://gitlab.psi.ch/OPAL/manual-master/wikis/elements) the
>     quadrupole-element does not have a FMAPFN attribute.
> 
>     Thank you very much in advance.
> 
>     Best regards,
>     Simon
> 
>     --
> 
>     ------------------------------------
> 
>     Dr. Simon Friederich
> 
>     Helmholtz-Institut Mainz
> 
>     Kollaboration B / ACID
> 
>     Johannes Gutenberg-Universität Mainz
> 
>     Staudingerweg 18
> 
>     55128 Mainz, Deutschland
> 
>       
> 
>     Tel.: +49 (0)6131 39-23160
> 
>     E-Mail:s.friederich AT uni-mainz.de  
> <mailto:s.friederich AT uni-mainz.de>
> 
>     ------------------------------------
> 


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