CEA Codes forum

Thank you very much for the DIAG_PHASE_ADV command. It helps me a lot in beam physics design.

And another function is useful to me: the same size or beta function for X and Y.

For example, I need a beam waist at a position, which could be set by "DIAG_WAIST" or "DIAG_TWISS". At the same time, I need the beta function for X and Y to be the same, which is a weaker requirement than "DIAG_TWISS", not defining the exact value for the beta function.

Do you mind considering it?

Kinds,
shliu

Dear Shliu,

Ok, I added 2 new diagnostics elements, DIAG_BETA and DIAG_DBETA, see manual for details.

Regards,

Didier

Dear Didier,

I noticed the command "DIAG_DBETA" doesn't work in the latest version. Could you please fix it?

Kinds,
shliu

Dear shliu,

That works on my side, please show me your example

Regards,

Didier

Attached the project.

BTW, how to set the same twiss parameters at the same position? Would there be an example?I list a .dat file here.

DRIFT 300 75 0 0 0
ADjust 101 1 0
SOLENOID 100 1 75
DRIFT 300 75 0 0 0
DIAG_WAIST 101 1 1

ADJUST 102 1 0
EDGE 0 1600 150 0 0 75 0
BEND 45 1600 0 75 0
ADJUST 102 1 0
EDGE 0 1600 150 0 0 75 0

DIAG_DTWISS 102 1 1 1 1 0
DRIFT 0 75 0 0 0
DIAG_DTWISS 102 1 1 1 1 0
end

Dear shliu,

Ok, I see now that it is a problem of beta definition (TWISS vs function). I added for DIAG_BETA & DIAG_DBETA a new option to select the beta definition used (see manual for explanation).

Regards,

Didier

Thank you!

Then how about the last problem? How to use diag_dtwiss. Is there a simple example?

Hi,

The explanation in the manual is normally sufficient, if not tell me, because it seems rather trivial

Regards,

Didier

Hi Didier,

I upload the project file to check the problem with the command diag_dtwiss.

Could you help to check it? Maybe I didn't quite understand the description in the manual.

Kinds,
shliu