elegant2astra

[headdoggy64]

Hello all,

I am having an issue with elegant2astra conversion tool.

After creating a bunch:

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&bunched_beam 
  bunch                    = %s.bun,
  n_particles_per_bunch=50000,
  sigma_s = 5.7735e-7
  sigma_dp = 1e-3
  emit_nx = 1e-6,
  emit_ny = 1e-6, 
  use_twiss_command_values = 1,
  distribution_type[0]     = "gaussian",
  distribution_type[1]     = "gaussian",
  distribution_type[2]     = "hard-edge",
  distribution_cutoff[0]   = 3.0,
  distribution_cutoff[1]   = 3.0,
  distribution_cutoff[2]   = 3.00,
  symmetrize               = 1,
  enforce_rms_values[0]    = 1,
  enforce_rms_values[1]    = 1,
  enforce_rms_values[2]    = 1,
  Po= 1000
&end

I convert it into Astra:

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elegant2astra fodo.bun hardedge.in

and getting this in Astra:

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     total charge                      Q =            NaN nC
     horizontal beam position          x =            NaN mm
     vertical beam position            y =            NaN mm

which ruins the process.

What am I doing wrong here? Thank you.

[michael_borland]

There are two problems:
* The charge is not defined in the &bunched_beam output file, since it is only defined after passing through a CHARGE element.
* The twiss parameters are (presumably) not defined, yet you use "use_twiss_command_values = 1" in the &bunched_beam command.

See attached files, and try

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% elegant run1.ele
% elegant2astra run1.out run1.astra
% head run1.astra

--Michael

[headdoggy64]

Thank you!
I figured this out. One can always redefine the charge values in the .bun file with sddsprocess.