Summary of Continuous Wave Injection at bKAGRA phase1 operation

• Worker : T.Yokozawa, A.Miyamoto, T.Sawada
• MICH LOCK flag
  • K1:GRD-LSC_LOCK_STATE_N (16Hz sampling)
    • 1000 is operation mode
• Injection flag
  • (1) K1:CAL-CS_CALHWI_CW_INJ_SW (16Hz sampling, on:1 off:0)
    • Hardware injection switch of CW injection (used in injection flag)
  • (2) K1:CAL-CS_CALHWI_HWINJ_SW (16Hz sampling, on:1 off:0)
    • Hardware injection master switch (used in injection flag)
  • (3) K1:CAL-CS_CALHWI_(X/Y/BS)_GAIN (16Hz sampling)
    • Signal gain to X, Y, BS
• Injection signal
  • (4) K1:CAL-CS_CAL_HWI_HARDWARE_DQ (16kHz sampling)
  • Total amplitude of Hardware injection(CBC+CW+TEST)
• So, total amplitude of CW injection is
  • (1)*(2)*(3)*(4) [count]
  • But, we should apply transfer function between injection port and displacement of each test mass when evaluating the TM displacement
    • time delay between cal model and BS model (~61usec)
    • digital anti-imaging filter
    • time delay in the BS IOP(shared memory for DAC output) (~61usec)
    • time delay in the DAC output (There is unknown issue) (~60usec???)

      • The detail is summarized in (JGWDoc6924)

    • analog anti-imaging filter
    • Coil driver(The transfer function is still investigated, with connection of coil)
    • Force to length transfer function(1/f^2 for higher frequency)
    • Actuator efficiency (Large measurement uncertainties due to fluctuation of optical gain)
• Injection method
  • k1script:/users/yokozawa/inj_phase1/inj_dat.sh
  • k1script:/users/yokozawa/inj_phase1/inj_dat2.sh
    • Prepare the dat files before injection, scp from other PC, using awgstream we injected signal.
• Injection waveforms

  • 15 LIGO injection pulsars(LIGO O1 CWINJ)

  • 6 continuous sine