PTC_TWISS A_ Initialization

Initialization is done in subroutine initmap

There are 2 use cases

1. Transfer lines with provided initial parameters

• Initialisation with Twiss parameters (beta, alpha and dispersion)
• A_ linear coefficients are read from a table, enabled with option initial_ascript_manual=true
• option initial_matrix_manual=true
• option initial_matrix_table=true
• option initial_moments_manual=true
• option initial_map_manual=true

2. Closed solution of rings

Transfer lines with provided initial parameters

1. Initialisation with Twiss parameters (beta and alpha) It is activated when betx and bety passed to ptc_twiss are bigger than zero and all options initial_* are false.

   It is implemented in subroutine readinitialtwiss.

   • It reads the arguments passed to ptc_twiss ** Orbit ** For transverse planes beta, alpha, dispersion ** For longitudinal beta and alpha

   • Beta and alpha is scaled with the reference momentum

      do i=1,c_%nd
        be(i)= beta(i)/(1_dp+orbit(5))
        al(i)=alpha(i)/(1_dp+orbit(5))
        !print*, 'be ', be(i), ' beta', beta(i)
     enddo

Closed solution of rings