old_contents: from .dcct import DCCT
  from .li_llrf import LiLLRF
  from .rf import RF
  from .sofb import SOFB
  from .kicker import Kicker
  from .septum import Septum
  from .screen import Screen
  from .bpm import BPM
  from .ict import ICT
  from .ict import TranspEff
  from .egun import HVPS
  from .egun import Filament
  
new_contents: from .dcct import DCCT
  from .li_llrf import LiLLRF
  from .rf import RF
  from .sofb import SOFB
  from .kicker import Kicker
  from .septum import Septum
  from .screen import Screen
  from .bpm import BPM
  from .ict import ICT
  from .ict import TranspEff
  from .egun import Bias
  from .egun import Filament
  from .egun import HVPS
  
subject: Add missing egun.bias in init