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Exploring Initial Condition Input Approaches in the PTC_TWISS Module

This document discusses three approaches for initializing conditions in the PTC_TWISS module developed by Kaizhi Zhang. The methodologies include reading from a map table, manually inputting transfer matrix elements, and transforming Twiss parameters into matrix elements. Examples illustrate the acquisition of Twiss values at various points in a transfer line, emphasizing the necessity of careful handling of coupled cases. Proper safeguarding of the code against failures is also highlighted, marking the start of robust implementations.

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Exploring Initial Condition Input Approaches in the PTC_TWISS Module

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  1. Input of PTC_TWISS module Kaizhi Zhang 2005.07.04

  2. 3 approaches for initial condition input • The point • 3 approches – example file • Read from map_table • Input the elements of transfer matrix manually • Input twiss values and transform to elements of matrix • data_block • Manually • Meaningless when coupled

  3. Example.1 input from the beta0 block • At the end of the ring, data_block is produced SAVEBETA, label=TWSSip, place=#E,sequence=fivecell; select,flag=twiss,column=name,s,betx,bety,dx,dy; • At the start ponit of the line, beta0 block is introduced ptc_twiss,icase=5,no=1,BETA0=TWSSip Resulted twiss values Ring line

  4. Input twiss parameter instead Input betx,alfx,mux,…,muy,and dx, dpx, …, dpy, if betz,alfz,mz<>0,the matrix is overlaid with dx, dpx, …, dpy=0 Using To construct matrix or

  5. Example 2: input twiss parameter manually betx=177.6823337,bety=32.05718846,alfx=-2.411683347, alfy=0.4797516839, dx=2.176379444,dpx=0.02964538223,mux=1.254518853,muy=1.25446531, Twiss values along tranferline

  6. From the map_table At the end of the ring, map_table is created ptc_normal,closed_orbit,maptable,icase=5,no=1 At the beginning of the line, the values are input from map_table with initial_matrix_table.and.k<>-1 k = double_from_table("map_table ", “coef ", 1, d_val) to take “coef” from map_table, then put to the component of taylor series.

  7. Example 3: Read transfer matrix from table • Map_table Result from example1 • Twiss values of transferline: the same as from betablock

  8. Coupled case Kick is added: acbv1=1e-6; acbv2=1e-6; acbv3=1e-6; acbv4=1e-6; acbv5=1e-6; Closed_orbit transferline

  9. Example 4 : Input transfer matrix coef manually • Input elements of matrix directly with Initial_matrix_manual • Command line: ptc_twiss,icase=5,no=1,initial_matrix_manual re11=-2.4571122533365,re12=176.79612000630,re13=0.23000824922475E-01, re14=1.0688611352549,re16=2.3391750911139,re21=-.38675166732927E-01, re22=2.3757451844819,re23=0.59429549540250E-03,re24=0.21234193844153E-01, re26=0.44298917404022E-01,re31= -.13869369418419E-01,re32=1.1108843741365, re33=0.44540891438146,re34=32.763919904586,re36=0.23713296091797E-02, re41=-.10425674606620E-03,re42=0.18936158169385E-01,re43=-.37799347979450E-01, re44=-.53503193709587,re46=-.94686370477940E-03, Twiss values along transferline

  10. Now the main features of ptc_twiss module are in place. • What is left to be done is to safeguard the code against failure. • That is the begining.

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