The OPAL Discussion Forum

["Zhang Hui (PSI)" <hui.zhang AT psi.ch>]

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
WBGA/C34
Forschungsstrasse 111
5232 Villigen PSI
Schweiz

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

From: opal-request AT lists.psi.ch <opal-request AT lists.psi.ch> On Behalf Of douguoliang
Sent: Mittwoch, 23. März 2022 11:29
To: opal <opal AT lists.psi.ch>
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,

Dou

 

	douguoliang
douguoliang AT impcas.ac.cn