The OPAL Discussion Forum

[Dou Guoliang <douguoliang AT impcas.ac.cn>]

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.

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?

Hope your reply, thank you!

Best regards,

Guoliang Dou

	Dou Guoliang Institute of Modern Physic Chines Academy of Science
509 Nanchang Road, Lanzhou, Gansu 730000 China Mobile: +86 13008705793 E-mail: douguoliang AT impcas.ac.cn             douguoliang52 AT gmail.com