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CST Settings Files

The text files saved out of CST beam simulations do not have much of the critical metadata needed for UVBeam objects. This required metadata can be set via keywords when the files are read in, but it is better for the metadata to be specified once and carried with the data files. To that end, we developed a yaml settings file specification to carry all the metadata. This format is very human readable and writeable and we encourage using such a file as the best way to ensure the metadata is preserved. Note that reading a yaml settings file into UVBeam requires that pyyaml is installed.

Required Fields

The following are the required fields in a CST yaml settings file. The lists of frequencies specifies the frequency in each filename, so the lists must be in the same order (as must the feed_pol if it is a list):

  • telescope_name (str)
  • feed_name (str)
  • feed_version (str)
  • model_name (str)
  • model_version (str)
  • history (str)
  • frequencies (list(float))
  • cst text filenames (list(str)) -- path relative to yaml file location
  • feed_pol (str) or (list(str))

Optional Fields

The following are optional fields:

  • ref_imp (float): beam model reference impedance
  • sim_beam_type (str): e.g. 'E-farfield'
  • any other field that contains useful information that should be propagated with the beam. These will go into the extra_keywords attribute (note that if the field names are more than 8 characters they will be truncated to 8 if the beam is written to a beamfits file).

Example Settings File

An example settings yaml file for a HERA Vivaldi feed simulation is shown below. In this example, 'software', 'layout', and 'port_num' are extra fields that will be propagated with the beam. Note that quotes are used around version numbers that could be interpreted as floats and around filenames with spaces in them, but other strings do not require quotes. The history field shows a way to make a multi-line string (although this history is quite short, there could be many lines of history information there.):

telescope_name: HERA
feed_name: Vivaldi
feed_version: '1.0'
model_name: Mecha design - dish - cables - soil
model_version: '1.0'
software: CST 2016
history: |
    beams simulated in Nov 2018 by NF
frequencies: [50e6, 51e6, 52e6, 53e6, 54e6, 55e6, 56e6, 57e6, 58e6, 59e6, 60e6, 61e6, 62e6, 63e6, 64e6, 65e6, 66e6, 67e6, 68e6, 69e6, 70e6, 71e6, 72e6, 73e6, 74e6, 75e6, 76e6, 77e6, 78e6, 79e6, 80e6, 81e6, 82e6, 83e6, 84e6, 85e6, 86e6, 87e6, 88e6, 89e6, 90e6, 91e6, 92e6, 93e6, 94e6, 95e6, 96e6, 97e6, 98e6, 99e6, 100e6, 101e6, 102e6, 103e6, 104e6, 105e6, 106e6, 107e6, 108e6, 109e6, 110e6, 111e6, 112e6, 113e6, 114e6, 115e6, 116e6, 117e6, 118e6, 119e6, 120e6, 121e6, 122e6, 123e6, 124e6, 125e6, 126e6, 127e6, 128e6, 129e6, 130e6, 131e6, 132e6, 133e6, 134e6, 135e6, 136e6, 137e6, 138e6, 139e6, 140e6, 141e6, 142e6, 143e6, 144e6, 145e6, 146e6, 147e6, 148e6, 149e6, 150e6, 151e6, 152e6, 153e6, 154e6, 155e6, 156e6, 157e6, 158e6, 159e6, 160e6, 161e6, 162e6, 163e6, 164e6, 165e6, 166e6, 167e6, 168e6, 169e6, 170e6, 171e6, 172e6, 173e6, 174e6, 175e6, 176e6, 177e6, 178e6, 179e6, 180e6, 181e6, 182e6, 183e6, 184e6, 185e6, 186e6, 187e6, 188e6, 189e6, 190e6, 191e6, 192e6, 193e6, 194e6, 195e6, 196e6, 197e6, 198e6, 199e6, 200e6, 201e6, 202e6, 203e6, 204e6, 205e6, 206e6, 207e6, 208e6, 209e6, 210e6, 211e6, 212e6, 213e6, 214e6, 215e6, 216e6, 217e6, 218e6, 219e6, 220e6, 221e6, 222e6, 223e6, 224e6, 225e6, 226e6, 227e6, 228e6, 229e6, 230e6, 231e6, 232e6, 233e6, 234e6, 235e6, 236e6, 237e6, 238e6, 239e6, 240e6, 241e6, 242e6, 243e6, 244e6, 245e6, 246e6, 247e6, 248e6, 249e6, 250e6]
filenames: ['farfield (f=50) [1].txt', 'farfield (f=51) [1].txt', 'farfield (f=52) [1].txt', 'farfield (f=53) [1].txt', 'farfield (f=54) [1].txt', 'farfield (f=55) [1].txt', 'farfield (f=56) [1].txt', 'farfield (f=57) [1].txt', 'farfield (f=58) [1].txt', 'farfield (f=59) [1].txt', 'farfield (f=60) [1].txt', 'farfield (f=61) [1].txt', 'farfield (f=62) [1].txt', 'farfield (f=63) [1].txt', 'farfield (f=64) [1].txt', 'farfield (f=65) [1].txt', 'farfield (f=66) [1].txt', 'farfield (f=67) [1].txt', 'farfield (f=68) [1].txt', 'farfield (f=69) [1].txt', 'farfield (f=70) [1].txt', 'farfield (f=71) [1].txt', 'farfield (f=72) [1].txt', 'farfield (f=73) [1].txt', 'farfield (f=74) [1].txt', 'farfield (f=75) [1].txt', 'farfield (f=76) [1].txt', 'farfield (f=77) [1].txt', 'farfield (f=78) [1].txt', 'farfield (f=79) [1].txt', 'farfield (f=80) [1].txt', 'farfield (f=81) [1].txt', 'farfield (f=82) [1].txt', 'farfield (f=83) [1].txt', 'farfield (f=84) [1].txt', 'farfield (f=85) [1].txt', 'farfield (f=86) [1].txt', 'farfield (f=87) [1].txt', 'farfield (f=88) [1].txt', 'farfield (f=89) [1].txt', 'farfield (f=90) [1].txt', 'farfield (f=91) [1].txt', 'farfield (f=92) [1].txt', 'farfield (f=93) [1].txt', 'farfield (f=94) [1].txt', 'farfield (f=95) [1].txt', 'farfield (f=96) [1].txt', 'farfield (f=97) [1].txt', 'farfield (f=98) [1].txt', 'farfield (f=99) [1].txt', 'farfield (f=100) [1].txt', 'farfield (f=101) [1].txt', 'farfield (f=102) [1].txt', 'farfield (f=103) [1].txt', 'farfield (f=104) [1].txt', 'farfield (f=105) [1].txt', 'farfield (f=106) [1].txt', 'farfield (f=107) [1].txt', 'farfield (f=108) [1].txt', 'farfield (f=109) [1].txt', 'farfield (f=110) [1].txt', 'farfield (f=111) [1].txt', 'farfield (f=112) [1].txt', 'farfield (f=113) [1].txt', 'farfield (f=114) [1].txt', 'farfield (f=115) [1].txt', 'farfield (f=116) [1].txt', 'farfield (f=117) [1].txt', 'farfield (f=118) [1].txt', 'farfield (f=119) [1].txt', 'farfield (f=120) [1].txt', 'farfield (f=121) [1].txt', 'farfield (f=122) 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'farfield (f=194) [1].txt', 'farfield (f=195) [1].txt', 'farfield (f=196) [1].txt', 'farfield (f=197) [1].txt', 'farfield (f=198) [1].txt', 'farfield (f=199) [1].txt', 'farfield (f=200) [1].txt', 'farfield (f=201) [1].txt', 'farfield (f=202) [1].txt', 'farfield (f=203) [1].txt', 'farfield (f=204) [1].txt', 'farfield (f=205) [1].txt', 'farfield (f=206) [1].txt', 'farfield (f=207) [1].txt', 'farfield (f=208) [1].txt', 'farfield (f=209) [1].txt', 'farfield (f=210) [1].txt', 'farfield (f=211) [1].txt', 'farfield (f=212) [1].txt', 'farfield (f=213) [1].txt', 'farfield (f=214) [1].txt', 'farfield (f=215) [1].txt', 'farfield (f=216) [1].txt', 'farfield (f=217) [1].txt', 'farfield (f=218) [1].txt', 'farfield (f=219) [1].txt', 'farfield (f=220) [1].txt', 'farfield (f=221) [1].txt', 'farfield (f=222) [1].txt', 'farfield (f=223) [1].txt', 'farfield (f=224) [1].txt', 'farfield (f=225) [1].txt', 'farfield (f=226) [1].txt', 'farfield (f=227) [1].txt', 'farfield (f=228) [1].txt', 'farfield (f=229) 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sim_beam_type: E-farfield
feed_pol: x
layout: 1 antenna
port_num: 1
ref_imp: 100