Concept and Current Status of Japan 4m RSE March Kentaro Somiya LIGO-G030110-00-Z.

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Presentation transcript:

Concept and Current Status of Japan 4m RSE March Kentaro Somiya LIGO-G Z

Two Types of RSE Control Scheme 1)Low/High Scheme : 9MHz and 180MHz 2)Low/Low Scheme : 9MHz and 18MHz For both method, asymmetry is optimized for ls signal. A couple of sidebands are used.

Asymmetry Optimization for ls (obtained by SB) isin  cos  rsrs ls is maximized when

Two Solutions for Optimized Asymmetry   /2 0 -r s rsrs cos  9MHz (LO : non-reso in SRC) 18MHz (Probe for L/L Scheme) 180MHz (Probe for L/H Scheme) (anti-resonant) (resonant) LOW/LOW Freq. Mod. Ctrl. Scheme of Japan RSE LOW/High Freq. Mod. Ctrl. Scheme of Glasgow RSE

In the case with Power Recycling Signal is maximized when Japan 4m  = for r s =0.89, r p =0.89 Glasgow 10m  =  /2 and r s =-r p Both scheme meets the optimized condition.

Good and Bad of Japan RSE Scheme 9-18MHz is realized by 1 modulation and its harmonics. Not too high freq. is used for L- detection. ls signal is smaller if the 2 nd harmonics are used. l- signal is smaller. for about m/2 because of the resonant conditions alternative to DC readout Simple!

SB Resonant Condition Glasgow Scheme Japan Scheme -f2(non-reso) f1(PRC) +f2 (PR-RSE) -2nd(PRC) 1st(non-reso) +2 nd (PR-RSE) L- : DP f2 L+ : BP f1 l- : BP DDM l+ : BP f2-f1 ls : PO f2-f1 L- : DP 2nd L+ : BP 2nd l- : BP DDM l+ : BP 3rd ls : PO 3rd

Third Harmonic Demodulation Phasor Diagram 1st 2nd Signal Freq. -1st x +2nd+1st x -2nd Carrier x -3rdCarrier x +3rd Beat signals of 1 st and 2 nd SB do not include L+/L- signals. But beat signals of carrier and 3 rd SB are undesirable for THD.

Acquisition of ls signal Lock point : -2nd is resonant in SRC THD I-phase signal at Bright Port (  =  /2-0.4, w/o PRM and w/o arm cavity) Top: Dependence on 3 rd harmonics Elimination ratio of 0%, 50%, 90% Bottom: Dependence on asymmetry  =0.5, 0.1, (for 1 st SB) Residual 3rd harmonics generate another lock point at Broadband SR. Too much asymmetry yields an offset to the lock point. We can acquire ls signal!

Third harmonics elimination by secondary EOM m, f m', 3f Output = If J 0 J 1 '=J 3 J 0 ' then sin3  t components will be eliminated. This can be done by single broadband EOM (P. Beyersdorf is developing)

Third harmonics elimination experiment 0th 1st 2nd 3rd 4th 3rd Output of Optical Spectrum Analyzer Only the primary EOM (0.63rad). Add the secondary EOM (0.07rad). After the adjustment (p:0.87, s:0.07rad). 3 rd is eliminated while 4 th can be seen. There will be no L+/L- mixture on THD.

500mW Finesse 2000 r RSE =0.89 Asymmetry 47cm (  =0.34) Detuning  =0.38 from BRSE 4m RSE in Japan : Setup ~1.5Hz pendulum ~ 40g mass Damping magnet Cupper plate Blade spring (~20Hz) inside r PR =0.89

Transfer Function including RP Effect Japan 4m M=40g, I=200mW, F=2000,  =0.4, r=0.89 FPMI BRSE M=40kg, I=200W Using small mirrors is a big advantage to observe the optical spring. Ref. gr-qc PRG= k 10k 100k (Hz)

Current Status Initial optical setup with suspensions Third harmonics elimination l- lock with 1 st demodulation l- lock with 3 rd demodulation ls lock with 3 rd demodulation Optical Analysis of SB unbalance l- lock with double demodulation Arm lock with 1 st demodulation L+/L- lock with 2 nd demodulation TF measurement Power Recycling (optional) DONE! TO BE DONE

I think it's locking (w/o arm cavities) Unlock SR Unlock Michelson

Double Demodulation 1st:sin  t 2nd(USB):cos2  t 1st:cos  t 1st:cos2  t 1st:sin  t 2nd:sin2  t 2nd:sin  t 2nd:cos2  t l- ls I-phase:ls Q-phase:l-(2 nd )+DCI-phase:nothing Q-phase:l-(1 st )