CEA Codes forum

Dear Sir, Thank you so much for your kind help. I have another question to ask. The particle bunch with some energy spread goes through the element "SOLENOID". The particles with different energy have different focus length. It is called chromatic aberration. Some scientists exploit chromatic aberra...

Dear Didier, I still want to figure out how the reference trajectory is determined in “Field map with curved reference trajectory”. Is it an arc linking the entrance point and the exit point, and meets the tangent angle requirement of the entrance ? In the instruction, it tells that “If your ouptut ...

Dear Didier, Thank you so much for your wonderful suggestions. If I use "MULTIPOLE"(for solenoid) and have satisfactory results, how can I decide the aperture, thickness and length of my real solenoid? Could you please tell me how the fieldmap of "MULTIPOLE" is created ? In my research, we need to d...

Dear Didier, In my field map, I just set Bz to be 1T, and Bx, By is equal to 0T, just like a hard-edge model. But it does not match the result of "SOLENOID" element. However, the "SOLENOID" element is a hard-edge model, and it does not consider the real field in the edge. Is that right ? It is so co...

Dear Didier,

Sorry I make a mistake. My field map "idea_sole" is 800mm long. It seems that my field map "idea_sole" results does not match the "SOLENOID" Element.
Could you please show me why this happen?

Kind regards,
Jie Li

Dear Didier, I just make a idea solenoid field map to check the feasibility. It seems that 800mm solenoid field map does not match the "Solenoid element". You say I should check 400 mm. But it also does not match the 400mm "Solenoid element" perfectly. And I use two 400mm solenoid field map, the res...

Dear Didier,

Here is my file. I have two questions in the file:

1. my idea solenoid fiedlmap does not match the "solenoid element"
2. the difference of "Patran or from file" and "Envelope" in "chart"

Kind regards,
Jie Li

Dear Didier, Sorry to trouble you. Tracewin is a powerful tool for my study. Thank you very much. But I have some trouble with the different result of "Patran or from file" and "Envelope". For example, the envelope curve may focus in "Envelope"but defocus in "Patran or from file" . Could you please ...

Dear Didier, Your answer gives me much confidence for my work. Indeed tracewin is a powerful tool for simulating beam dynamics.I will appeal to more colleages to buy and use it. To be honest, I have learned beam physics for just 9 months. Now I just ask another person who have bought it to run my co...

Dear Didier, Thanks for your detailed reply, which gives me much help indeed. According to your idea, my problem can be solved by the latest version of TraceWin. The elemet consists of two parts, entrance and exit. And then I want to repeat it 3 times. In the entrance, the mixed field maps are 2mm_D...