The OPAL Discussion Forum

[Adelmann Andreas <andreas.adelmann AT psi.ch>]

Dear Abel sorry for the delay in answering.

Indeed this is an interesting problem, maybe even a challenge! 

OPAL does not have a predefined alpha magnet. However if a field map could read

into the cyclotron flavour (http://amas.web.psi.ch/opal/Documentation/master/#sec.elements.cyclotron)

or into the Ring element (http://amas.web.psi.ch/opal/Documentation/master/#sec.elements.ringdefinition) one 

could try to model this.

I would guess that there is a need to model synchrotron radiation (maybe in a second phase) and what certainly needs 

to be addressed is the small bending radius. Our field solver uses a Cartesian grid, we need to understand the implication

of this. 

Overall I am certain that OPAL can be used/updated to solve that problem, however some modification are maybe required order.

Cheers A
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Dr. sc. math. Andreas (Andy) Adelmann
Head a.i. Labor for Scientific Computing and Modelling 
Paul Scherrer Institut OHSA/D09 CH-5232 Villigen PSI
Phone Office: xx41 56 310 42 33 Fax: xx41 56 310 31 91
Zoom ID: 470-582-4086 Password: AdA
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On 7 Apr 2023, at 15:38, Abel.PIRES AT cea.fr wrote:

Hello,

 

I am contacting you because I am interested by your code. I am working at CEA in France, close to Paris. I work on a 30 MeV electron LINAC. After first acceleration stage, the beam reach 17 MeV and then travels through two alpha magnets. With appropriate chirp, we can compress beam from 30ps rms to 7ps rms. At high charge (>1nC) there is large emittance growth within the alpha magnets.

We want to simulate properly the beam transport through this magnetic element, which bend the beam trajectory into the shape of a alpha letter. I am joining an image to illustrate.

 

A good simulation of the transport through alpha magnet is necessary, we could use field maps in the laboratory frame, or the alpha transfer matrice. Then a good simulation of space charge effects is necessary, with the least assumptions.

I have three questions, if you could answer them that would help me decide if I should use your code for these simulations.

 

Do you know if your code would enable such simulations ?

What are the assumptions done in your code that could be inappropriate for this situation ?

What are the strength of your code regarding this simulation ?

 

If you have any questions or need more details don’t hesitate to contact me.

 

Best regards,

Abel Pires