close orbit and response matrix when random error exist?
Posted: 02 Aug 2022, 06:38
Hi Michael,
Recently, I am trying to evaluate the influence from random errors in our pertra4 lattice. The purpose of this study is to select lattices, with errors, which can insure beta-beating within 5%, coupling factor within 10%, and further used these selected lattices for DA and LMA tracking.
In the attached *.ele file, you can how I set the position offset errors for magnets and tilt errors for quadrupole. The steering element are set as combined horizontal-vertical kicker element.
In my *.ele file, there are several things I am not sure, hopefully you can help me to figure it out.
1) As I set in *.ele file, after the &correct &end command. I assume this command only take care of the closed orbit correction without coupling correction, is it?
2) With &correction_matrix_output &end command, I also print out the response matrix. What I expect is non-zero cross plane response matrix in *.vhrm or *.hvrm, whereas, the matrix elements in *.vhrm or *.hvrm are zero. Since the cross plane response matrix is necessary for the coupling factor calculation, how should I do to get the non-zero cross plane response matrix?
Great thanks for your answers.
yours Chao
Recently, I am trying to evaluate the influence from random errors in our pertra4 lattice. The purpose of this study is to select lattices, with errors, which can insure beta-beating within 5%, coupling factor within 10%, and further used these selected lattices for DA and LMA tracking.
In the attached *.ele file, you can how I set the position offset errors for magnets and tilt errors for quadrupole. The steering element are set as combined horizontal-vertical kicker element.
In my *.ele file, there are several things I am not sure, hopefully you can help me to figure it out.
1) As I set in *.ele file, after the &correct &end command. I assume this command only take care of the closed orbit correction without coupling correction, is it?
2) With &correction_matrix_output &end command, I also print out the response matrix. What I expect is non-zero cross plane response matrix in *.vhrm or *.hvrm, whereas, the matrix elements in *.vhrm or *.hvrm are zero. Since the cross plane response matrix is necessary for the coupling factor calculation, how should I do to get the non-zero cross plane response matrix?
Great thanks for your answers.
yours Chao