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AW: [Opal] Example of a chicane?

Chronological Thread 
  • From: "Kuske, Bettina" <bettina.kuske AT>
  • To: Chris Hall <chall AT>
  • Cc: "opal AT" <opal AT>
  • Subject: AW: [Opal] Example of a chicane?
  • Date: Tue, 31 Oct 2017 09:23:33 +0000
  • Accept-language: de-DE, en-US

Hi Chris, 

Try to turn the space charge off.
If it is achromatic then, your have a problem with what we call space charge dispersion. Due to the nonlinear, defocussing effect of space charge the chicane is not closed anymore. You can only try to minimize it, and you will find emittance growth. 
What do you need the chicane for? 


Von Samsung Mobile gesendet
-------- Ursprüngliche Nachricht --------
Von: Chris Hall
Datum:31.10.2017 00:00 (GMT+01:00)
An: opal AT
Betreff: [Opal] Example of a chicane?


I was wondering if anyone has an example of standard 4 dipole bunch compression chicane implemented in OPAL 1.6?

There is a chicane in regression-tests but it is currently listed as broken. I have tried several implementations of my own but the result never appears to be achromatic and I see emittance growth if my bunch has any energy spread.

Thank you,

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