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Keywords: non-uniform field, rf field,
Forum: Fields: Magnetic and Otherwise
Re: None how to add non-uniform M-field and rf EM field (long)
Date: 09 Jan, 2007
From: John Apostolakis <John Apostolakis>

I would suggest an alternative approach to "transport an electron beam through a non-uniform magnetic field, then pass through a cavity filled with [an] rf field."

There are a few conditions that would need to be met, for this 
solution to work:
 - the two fields must cover different volumes in space, and these must be well
separated,
 - there must be no conflicts/overlaps between these 'field' volumes and 
'real' volumes which contain parts of the setup

If these conditions are fulfilled it should be possible to create two volumes and put attach a different fields to each one. There would be no problem if one volume contained the other, or if they were apart.

Please remember that each field must use global coordinates only - both for the position and for the field it returns.

For the volume with the magnetic field, the standard way to create the field manager and chord finder can be used.

As Peter mentions, for the RF field, a time-dependent field will be needed. Depending on the field frequency and particle momentum/velocity, such a field could be challenging for the built-in integration. It could be necessary, or just better, to integrate the RF field yourself and give a kick to the particle.

Best regards, John Apostolakis

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1 None: Re: how to add non-uniform M-field and rf EM field   (Tom Roberts - 09 Jan, 2007)
(_ None: Re: how to add non-uniform M-field and rf EM field   (long - 09 Jan, 2007)
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