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- From: Adelmann Andreas <andreas.adelmann AT psi.ch>
- To: Dou Guoliang <douguoliang AT impcas.ac.cn>
- Cc: "opal AT lists.psi.ch" <opal AT lists.psi.ch>, Pedro Calvo Portela <Pedro.Calvo AT ciemat.es>
- Subject: Re: [Opal] Sprial sector cyclotron - sprial
- Date: Wed, 20 Nov 2024 14:46:53 +0000
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Hi Guoliang thanks for using OPAL! I will answer inline:
On 20 Nov 2024, at 09:09, Dou Guoliang <douguoliang AT impcas.ac.cn> wrote:
hello, everone.
We are designing a spiral sector cyclotron. And I am using OPAL to simulate the beam in the cyclotron.
When I calculate the acceleration orbits, there is no problem in magnet fields. But for the RF cavities， our RF cavities are also spiral cavities. In opal-cycl, only single gap RF cavity can be used. So , how to achieve the spiral RF cavities? I think there may be two ways to simulate the spiral RF cavities.
1.we can import the 3D electrical fields in the opal-cycl. And I have done this work in our designing cyclotron. But the shortcoming of this method is that the size of the electrical fields is so big. And we must have finished the design of RF cavities firstly.
Yes you can import! @Pedro, if I remember correctly you did something like this.
2.The spiral acceleration gap can be divided into hundreds of straight segments, each of which uses a single gap cavity type(in opal-cycl). All single gap cavities have the same RF frequency and initial phase. I think this may be another method to achieve the simulation of spiral RF cavities.
I don't know if the second method is appropriate.
And may be there are some other methods? Can you give me some advise and inspiration?
This is certainly an intersting idea, and you maybe get quick approximate
results. Did you spend some time thinking how you would validate a results from such an approximation?
Maybe it is even enough to add a single gap cavity, in order to get the tuns and energy correct
for initial beam dynamics studies. In the meantime the rf-design is maybe mature and you can
switch in the real field-maps.
Cheers A
Hope your reply, thank you!
Best regards,Guoliang Dou
-
[Opal] Sprial sector cyclotron - sprial,
Dou Guoliang, 11/20/2024
- Re: [Opal] Sprial sector cyclotron - sprial, Adelmann Andreas, 11/20/2024
-
AW: [Opal] Sprial sector cyclotron - sprial,
Zhang Hui, 11/20/2024
- Re: [Opal] Sprial sector cyclotron - sprial, Calvo Portela, Pedro, 11/20/2024
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