Elegant users forum

Michael, I tried the 'alphaExpansion' example, and the fitted alphac and alphac2 agree with those from .twi file. In my case(a low alpha lattice), the fitted alphac and alphac2 have large discrepancy with those form .twi file. In addition, I suppose the orbit length should be based on the closed orb...

Michael， Thanks a lot! I can have good results by running the example you provide. Now I optimized the filed and tried to run the tracking again. I found if I put the 50 ｐｈｉ（Ｂｒ） in one page in field.sdds file, I met problem with running computeGeneralizedGradients. The error message is 'warning: no ...

Michael,

How it goes with BGGEXP ? When the new version of elegant will be released?

Ji

Michael,

Yes, the lattice is unstable if the wiggler is switched off. Actually the optics is optimized for wiggler, because we need certain dispersion value at the wiggler to manipulate the damping partition numbers.

The lattice without wiggler is attached.

Ji

Michael,

I am just curious， is it possible to implement sympletic runge-kutta method to simulate wigglers and undulators ? Except the computational cost, is there any other reason not using it?

Ji

Michael, Thanks for your work and help. Two examples are attached. Robinson Wiggler was represented with Ftable and 10000 dipoles,respectively. In "slicing" folder, you will see the estimated emittace value, damping partition numbers and so on after running elegant. The values in the para.txt file w...

Michael, Thanks, I am looking forward to the next release. Is possible to calculate the ID's contributions to damping partition numbers and synchrotron radition integrals in the next version? Those are quite improtant for our case, a Robinson Wiggler. So far we can calculate those numbers by slicing...

Michael, Thanks a lot for your patient help. The plot seems OK now. But I used the generated .ggrad file for BGGEXP in this way: RWGG: BGGEXP,L=2.3, LFIELD=2.3, filename="ggExp.ggrad",strength =-1,Z_INTERVAL=1,symplectic=1 Is there anything wrong?.There is still one error: Adding BGGEXP data from fi...

Michael, Thanks for your reply. There are still errors with the new script. The following is the error when I run: computeGeneralizedGradients -input field.sdds -output GG -mainHarmonic 2 -nHarmonics 5 warning: (z, Bz) does not appear in GG.ref 1 of 1 datanames absent from file GG.ref warning: no da...

Michael,

Thanks a lot, that would be very helpful.

I use single R and much small intervals in z (stepsize 0.00023m), and it shows the same error message.So I am looking forward to the example.

Ji