LIGO-G010289-00-D What can we Expect for the “Upper Limit” Run Stan Whitcomb LSC Meeting 13 August 2001 LIGO Hanford Observatory A Personal Reading of.

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LIGO-G D What can we Expect for the “Upper Limit” Run Stan Whitcomb LSC Meeting 13 August 2001 LIGO Hanford Observatory A Personal Reading of Tea Leaves and Stone Tablets

LIGO-G D LSC Meeting 2 Lab Goals Overall goals »Bring interferometers, and data acquisition and analysis capability rapidly to the ability to collect and analyze coincidence data to address the scientific goals of LIGO. »Initiate scientific running in 2002 interleaved with progressive noise and availability studies »Advance both the interferometer commissioning and the commissioning of our analysis capability in a mutually balanced manner »Milestone, for the use of engineering run data to exercise the complete analysis pipeline Definitions: »Engineering runs (Ex): data taking runs that are primarily motivated by the Laboratory detector improvement program »Science runs (Sx): intended to produce a data product for the LSC with scientific goals and resulting in publications

LIGO-G D LSC Meeting 3 Intermediate Term LIGO Lab Planning “E6” run before the end of 2001 (December for two full weeks) »At least one interferometer at each observatory with at least one interferometer in full recycled configuration »Goal of significant locked coincidence data, but sensitivity not guaranteed »Laboratory responsibility, with participation open to LSC members in the LIGO I working groups. Data available to upper limits groups »Analysis goal: sensitivity curves (February), full analysis (April) »if not successful, repeat the E6 run in January 2002 S1 run May »Prime purpose to carry out the first scientific searches »Joint responsibility of the Laboratory and the LSC »Sensitivity goal is a two site coincidence with 3 interferometers running and the achieved scientific reach 10x better than “E6 S2 run »At least 10x improvement in scientific reach beyond S1,following completion of S1 analysis Interleaving of E and S runs with improved scientific reach until design sensitivity and reliability are obtained

LIGO-G D LSC Meeting 4 Detector Status All in-vacuum installation complete »Continuing installation and commissioning of control systems LHO 2 km interferometer »Locks in recycled configuration for ~1 hour times »Sensitivity ~ rms »Working to improve both LLO 4 km interferometer »Locked as Michelson with F-P Arms »Problem with seismic noise at low frequencies LHO 4 km interferometer »Commissioning just beginning

LIGO-G D LSC Meeting 5 So, what will we have? *Expect* LHO interferometers to be operating in recycled configuration »Depends on success with digital suspension controllers LLO may operate in recycled, or possibly just recombined, mode »Final decision about 1 November »Analog suspension controllers -> different channel names, noise, filtering, limits, etc. Expect (but do not guarantee!) up to x10 improvement over already achieved Most PEM channels will be operational (though of lower priority than main interferometer components)

LIGO-G D LSC Meeting 6 Sensitivity? Sensitivity expected to be better than already achieved w/ 2 km

LIGO-G D LSC Meeting 7 Initial LIGO Sensitivity Goal Strain sensitivity <3x /Hz 1/2 at 200 Hz Sensing Noise »Photon Shot Noise »Residual Gas Displacement Noise »Seismic motion »Thermal Noise »Radiation Pressure

LIGO-G D LSC Meeting 8 When? Expressions of preference are welcome! Option 1 Option 2 (maximal quiet time for LLO)

LIGO-G D LSC Meeting 9 Discussion Questions? Comments? Complaints?