LIGO-G060397-00-D Beam Jitter Estimate at the OMC: Enhanced and Advanced LIGO Vuk Mandic LSC Meeting LSU, 08/14/06.

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Presentation transcript:

LIGO-G D Beam Jitter Estimate at the OMC: Enhanced and Advanced LIGO Vuk Mandic LSC Meeting LSU, 08/14/06

LIGO-G D 2 Outline of Calculation Estimate angular motion of TMs »Propagate to OMC waist Estimate BRT motion »Measure ground motion, propagate through LIGO HAM model »Propagate to OMC waist Tune OMC MMT to match the waist of the OMC cavity. Convert beam displacement and tilt into power (and strain) fluctuations at OMC. Compare with expected strain sensitivity. »Check how much isolation is necessary for OMC. Beam-Reducing Telescope, on HAM4 OMC Mode-Matching Telescope, on HAM6

LIGO-G D 3 ELIGO: Details TM angular spectrum obtained by calibrating WFS sensing signal. Determine displacement and tilt of the beam as it leaves ITM. BRT: »Measure ground motion (calibrate accelerometers (>5 Hz) and seismometers (<5 Hz)) »Run it through HAM stack model. Propagate all contributions to OMC waist, add in quadrature. OMC MMT: »Assume beam waist of 1cm at input of MMT1. »R 1 = 1m, R 2 = 0.14m, dephasing 4.5mm gives beam waist of 0.4 mm, 0.8 m from MMT2

LIGO-G D 4 ELIGO: Beam Jitter at OMC Waist DisplacementTilt

LIGO-G D 5 ELIGO: Power/Strain Spectra Beam Displacement: Beam Tilt: Power: Strain: »Assume simple Michelson, DC readout, and 10 pm offset Beam Waist Divergence Angle

LIGO-G D 6 ELIGO: Strain due to Beam Jitter a 2 (f) ≡ a(f) × RMS(a) a 2 (f) ≡ a(f) × a(f) f  2 f

LIGO-G D 7 ELIGO: OMC Suspension Requirements Beam jitter at the OMC typically much larger than: »ALIGO BSC + single pendulum »ISI-HAM (1-stage) + single pendulum »SS-HAM (super- stiff, i.e. a table) + double pendulum

LIGO-G D 8 AdvLIGO Modifications Guess angular motion of TM’s: »Scale LIGO angular spectrum by the ratio of AdvLIGO and LIGO BSCs. Assume BRT on ISI-HAM (1-stage) »Angle = displacement / 10 New BRT specs from Mike Smith. New OMC MMT. Designed assuming: »60mm beam waist at input of BRT »Same OMC waist and position »R 1 = 0.43 m, R 2 = m, dephasing = 4 mm

LIGO-G D 9 ALIGO: Beam Jitter at OMC DisplacementTilt

LIGO-G D 10 ALIGO: Strain due to Beam Jitter a 2 (f) ≡ a(f) × RMS(a) a 2 (f) ≡ a(f) × a(f) f  2 f - Assume 10 pm offset - Ignore SRC

LIGO-G D 11 ALIGO: OMC Suspension Requirements