The OPAL Discussion Forum

[jjyang <jianjun.yang AT psi.ch>]

Hi Chuan, how is life?

By now in OPAL-CYCL, the RF gap is treated as a straight line and the momenta kick is applied during the gap crossing. 

In order to track particles in the full E-B field, the E field data should also in the cyclinder coordinates,  just like B field.  

As you know in the central region of a compact cyclotron, paticle is quite sensitive to the field shape which should be expressed in greater detail.

Cheers,

Jianjun

在 2011-9-7，下午1:27， wangchuan02513 写道：

Hi, Andreas,

In my simulation on cyclotron cavity multipacting, I just treat the direction of the height of the cavity as Z, and X axis is the symmetrical line of the cavity along angular direction. I don't know how does Jianjun model the cyclotron cavity in OPAL-cycl.

But as far as you know the way how OPAL-cycl treat the cavity field map, you can just modify the converter to read the ASCII field map and convert it into the right XYZ which fit the OPAL-cycl. 

I have to find the converter somewhere in my laptop and I'll send it to you when I come back to home.

Best regards

Chuan

At 2011-09-07 16:16:52,"Andreas Adelmann" <andreas.adelmann AT psi.ch> wrote:

Ok great! 

However there is one thing, because in OPAL-t the y and z axis are  different than in OPAL-cycl where did 

you take that into account?  

In the converter frpm ANSIS to H5Block?

Andreas 

On 07.09.2011, at 07:50, wangchuan02513 wrote:

Hi, Andreas,

I have not implemented the BoundaryGeometry stuff in OPAL-cycl.

However, various 3D cavity field maps are ready for simulation, which are mainly based on the H5Block lib. The one I used to simulate the multipacting in cyclotron is the FM3DH5Block_nonescale.cpp! . Which basically use the order that data varies fastest in X and slowest in Z. And this field map does not scale using scale factor defined in RFCavity class.

I'll find the example of ASCII file and the converter I made using H5Block lib and send them to you if you need them.

Best regards

Chuan Wang

At 2011-09-06 21:19:58,"Andreas Adelmann" <andreas.adelmann AT psi.ch> wrote:
>Hi Chuan can you shortly summarize the status w.r.t
>the usage of a 3D cavity field map in the Cyclotron flavor of OPAL?
>
>We would like to use a 3D field map for the acceleration of
>a proton beam in our Comet proton therapy Cyclotron. The field map
>is most likely generated with ANSYS.
>
>Best Andreas
>------
>Dr. sc. math. Andreas (Andy) Adelmann
>Staff Scientist
>Paul Scherrer Institut WLGB/132 CH-5232 Villigen PSI
>Phone Office: xx41 56 310 42 33 Fax: xx41 56 310 31 91
>Phone Home: xx41 62 891 91 44
>-------------------------------------------------------
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>============================================
>The more exotic, the more abstract the knowledge,
>the more profound will be its consequences.
>Leon Lederman
>============================================
>
>
>
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Best Andreas
------
Dr. sc. math. Andreas (Andy) Adelmann
Staff Scientist
Paul Scherrer Institut WLGB/132 CH-5232 Villigen PSI
Phone Office: xx41 56 310 42 33 Fax: xx41 56 310 31 91
Phone Home: xx41 62 891 91 44
-------------------------------------------------------
Friday: ETH CAB H 83.1  +41 44 632 36 72
============================================
The more exotic, the more abstract the knowledge,
the more profound will be its consequences.
Leon Lederman
============================================