Examples

Print BPM pvs along with s position

• Import ‘pytac’:

  >>> import pytac.load_csv
  >>> import pytac.epics
  

• Initialize the VMX mode:

  >>> lattice = pytac.load_csv.load('VMX', pytac.epics.EpicsControlSystem())
  

• Version 1: Get the BPM elements:

  >>> bpms = lattice.get_elements('BPM')
  

• Print the values of the readback pvs on the b1 field:

  >>> for bpm in bpms:
  >>>    print(bpm.get_pv_name('x', 'readback'), bpm.get_pv_name('y', 'readback'), 'S position', lattice.get_s(bpm))
  ('SR01C-DI-EBPM-01:SA:X', 'SR01C-DI-EBPM-01:SA:Y', 'S position', 4.38)
  ('SR01C-DI-EBPM-02:SA:X', 'SR01C-DI-EBPM-02:SA:Y', 'S position', 8.806500000000002)
  ('SR01C-DI-EBPM-03:SA:X', 'SR01C-DI-EBPM-03:SA:Y', 'S position', 11.374000000000002)
  ('SR01C-DI-EBPM-04:SA:X', 'SR01C-DI-EBPM-04:SA:Y', 'S position', 12.559000000000005)
  ('SR01C-DI-EBPM-05:SA:X', 'SR01C-DI-EBPM-05:SA:Y', 'S position', 14.942500000000006)...
  

• Version 2 - to get the pv name of each bpm:

  >>> lattice.get_family_pvs('BPM', 'x', 'readback')
  ['SR01C-DI-EBPM-01:SA:X',
  'SR01C-DI-EBPM-02:SA:X',
  'SR01C-DI-EBPM-03:SA:X'
  ...
  >>> lattice.get_family_pvs('BPM', 'y', 'readback')
  ['SR01C-DI-EBPM-01:SA:Y',
  'SR01C-DI-EBPM-02:SA:Y',
  'SR01C-DI-EBPM-03:SA:Y',
  ...
  >>> lattice.get_family_s('BPM')
  [4.38,
   8.806500000000002,
   11.374000000000002,
   ...
  

Get the pv value from the quad elements

• Import ‘pytac’

  >>> import pytac
  

• Initialize the VMX mode

  >>> lattice = pytac.load_csv.load('VMX', pytac.epics.EpicsControlSystem())
  

• Version 1: Get the Quad elements and print their readback values on the b1 field:

  >>> quads = lattice.get_elements('QUAD')
  >>> for quad in quads:
  >>>    print(quad.get_pv_value('b1', 'readback'))
  71.3240509033
  129.351394653
  98.2537231445
  ...
  

• Version 2: Print the quad pv values on the b1 field using the lattice. This is more efficient:

  >>> lattice.get_family_values('QUAD', 'b1', 'readback')
  [71.32496643066406,
   129.35191345214844,
   98.25287628173828,
  ...
  

Print pv names to file

• Import ‘pytac’ and epics:

  >>> import pytac.load_csv
  >>> import pytac.epics
  

• Initialize the VMX mode:

  >>> lattice = pytac.load_csv.load('VMX', pytac.epics.EpicsControlSystem())
  

• Version 1: Get the Quad elements individually:

  >>> q1b = lattice.get_elements('Q1B')
  

• Print the pvs to file:

  >>> with open('elements_in_families.txt', 'a') as out_file:
  >>>    for quad in q1b:
  >>>       pv_name = quad.get_pv_name('b1', 'readback').split(':')[0]
  >>>       out_file.write("{}\n".format(pv_name))
  SR01A-PC-Q1B-10
  SR03A-PC-Q1B-01
  SR03A-PC-Q1B-10
  ...
  

• Version 2: Get the Quad elements using the lattice:

  >>> with open('elements_in_families.txt', 'a') as out_file:
  >>>     out_file.write('{}'.format(lattice.get_family_pvs('Q1B', 'b1', 'readback')))
  ['SR01A-PC-Q1B-10:I', 'SR03A-PC-Q1B-01:I', 'SR03A-PC-Q1B-10:I']
  ...