CEA Codes forum

Thank you, Nicholas.

Wai-Ming

Dear Nicholas, I have seen you used the term "space charge compensation field map" or "field map containing the space charge compensation according to z". I do not understand what that is. Using a 1D electric field map as an example (edz), it is a list of numbers for the electric field strength with...

Dear Nicolas,

Thank you for your answer. Do you mean that Ki is a scaling factor for the strength of the field map?
My understanding to SPACE_CHARGE_COMP is scaling factor for the beam current in space charge calculation during transport.

Best regards,
Wai-Ming

Dear Didier,

There is a "Ki" parameter in the FIELD_MAP statement for space charge compensation. Are the two models below equivalent?

(1)
FIELD_MAP x x x x x x 0.5

(2)
SPACE_CHARGE_COMP 0.5
FIELD_MAP x x x x x x 0

Best regards,
Wai-Ming

Dear Didier, The two models give the same input phases (-3.137° and 157.86°) if the FIELD_MAP statement is set to absolute phase, which is good. If the FIELD_MAP statement is set to relative phase, the input phases itself and the differences between these two values are different for the two models....

Dear Didier, Thank you. I would like to make a request to make SET_SYNC_PHASE and ADJUST work together. In my application, I want to optimize the phase for other beam optics. But the initial phase value that makes physics sense to me is the synchronous phase. If I start with an arbitrary absolute ph...

Dear Didier, Thank you for testing on your side. I cannot show more. When I hit run, it flashes and disappears. It had happened several times in the past after a TraceWin upgrade. I suspect that it might be due to the cloud storage and firewall settings on my company computer. Since a few months ago...

Dear Didier,

Thank you. Could you have potentially introduced a bug in the new version? It crashes on some of my models that run fine on the previous version.

Best regards,
Wai-Ming

Dear Didier, Thank you. "Use new synchronous phase definition" works. How do I change the calculation step? It triggers another question: how can I control the "lattice" command, such as calculation step? To my understanding, both "set_sync_phase" and "lattice" are optimization. However, unlike "mat...

Dear Didier, I am aware of the "absolute phase" column in the data tab. It gives the absolute phase when the reference ion is at the beginning and at the end of an element. My problem is that with a field map, I can make it arbitrarily long. Please see fieldmap.PNG. The two models have identical phy...