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RE: [Opal] About 3D Electric Field

Chronological Thread  
  • From: "Zhang Hui (PSI)" <hui.zhang AT>
  • To: douguoliang <douguoliang AT>, opal <opal AT>
  • Subject: RE: [Opal] About 3D Electric Field
  • Date: Wed, 23 Mar 2022 10:50:02 +0000
  • Accept-language: en-US, de-CH
  • Authentication-results:; iprev=pass ( smtp.remote-ip=; spf=pass; dmarc=skipped

Dear Guoliang


ESCALE gives you the possibility to scale up or down the strength of the field map(s) imported for OPAL simulation. For example, if the map imported is calculated with a peak voltage 100 kV, and if the applied peak voltage is 80 kV, then you may scale down the map by setting ESCALE =  0.8.


Hopefully this answers your question.


Best regards, Hui  


Paul Scherrer Institut
Dr. Hui Zhang
rschungsstrasse 111
5232 Villigen PSI

Telefon: +41 56 310 53 98
E-Mail: hui.zhang AT

From: opal-request AT <opal-request AT> On Behalf Of douguoliang
Sent: Mittwoch, 23. März 2022 11:29
To: opal <opal AT>
Subject: [Opal] About 3D Electric Field


Hi , all


I'm using 3D electric fields to simulate the spiral sectors cyclotron. When using the field of type BANDRF , we need to set the parameter of ESCALE. I don't understand why  need to set the parameter ESCALE, and I want to verify my idea. Here is my understanding.


In fact, the same electric field has different energy gain for particles due to different number of grid points. OPAL uses raw imported electric fields from users without interpolation. The ESCALE is the ratio of the actual high-frequency voltage to the voltage obtained by integrating the imported electric field.


I'm not sure if I understand this correctly. Hope everyone can give some advice.


Best wishes,



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