BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/Los_Angeles BEGIN:DAYLIGHT DTSTART:20200308T030000 TZOFFSETFROM:-0800 TZOFFSETTO:-0700 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZNAME:PDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20201101T010000 TZOFFSETFROM:-0700 TZOFFSETTO:-0800 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZNAME:PST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20200627T161710Z UID:7803689B-FC85-4733-AA8E-479B8FBDD6E8 DTSTART;TZID=America/Los_Angeles:20200630T170000 DTEND;TZID=America/Los_Angeles:20200630T180000 DESCRIPTION:In September 2015\, the Laser Interferometer Gravitational-wave Observatory (LIGO) initiated the era of gravitational wave astronomy (a n ew window on the universe) with the first direct detection of gravitationa l waves (ripples in the fabric of space-time) resulting from the merger of a pair of black holes into a single larger black hole. In August 2017 the LIGO and VIRGO collaborations announced the first direct detection of gra vitational waves associated with a gamma ray burst and the electromagnetic emission (visible\, infrared\, radio) of the afterglow of a kilonova — the spectacular collision of two neutron stars. This marks the beginning o f multi-messenger astronomy. The kilonova discovery was made using the U.S .-based LIGO\; the Europe-based Virgo detector\; and 70 ground- and space- based observatories.\n\nThe Advanced LIGO gravitational wave detectors are second generation instruments designed and built for the two LIGO observa tories in Hanford\, WA and Livingston\, LA. These two identically designed instruments employ coupled optical cavities in a specialized version of a Michelson interferometer with 4 kilometer long arms. Resonant optical cav ities are used in the arms to increase the interaction time with a gravita tional wave\, power recycling is used to increase the effective laser powe r and signal recycling is used to improve the frequency response. In the m ost sensitive frequency region around 100 Hz\, the displacement sensitivit y is 10^-19 meters rms\, or about 10 thousand times smaller than a proton. In order to achieve this unsurpassed measurement sensitivity Advanced LIG O employs a wide range of cutting-edge\, high performance technologies\, i ncluding an ultra-high vacuum system\; an extremely stable laser source\; multiple stages of active vibration isolation\; super-polished and ion mil led optics\, high performance multi-layer dielectric coatings\; wavefront sensing\; active thermal compensation\; very low noise analog and digital electronics\; complex\, nonlinear multi-input\, multi-output control syste ms\; a custom\, scalable and easily re-configurable data acquisition and s tate control system\; and squeezed light. The principles of operation\, th e numerous control challenges and future directions in control will be dis cussed.\nMore information is available at [https://www.ligo.caltech.edu/]( https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ligo .caltech.edu%2F&data=02%7C01%7Cgarrett.clayton%40villanova.edu%7C4e834a8b8 b9243dabd4808d7618ba979%7C765a8de5cf9444f09cafae5bf8cfa366%7C0%7C0%7C63708 5124782402597&sdata=5X7t6kSiXLT%2FvGVB9scGghLWuclGr61yUIRvjBBKF%2B4%3D&res erved=0)\n\nCo-sponsored by: American Control Conference\n\nSpeaker(s): De nnis Coyne\, \n\nOn Line Event\, California\, United States LOCATION:On Line Event\, California\, United States ORGANIZER:maborrello@roadrunner.com SEQUENCE:3 SUMMARY:Control Challenges for the Laser Interferometer Gravitational-wave Observatory (LIGO) URL;VALUE=URI:https://events.vtools.ieee.org/m/233671 X-ALT-DESC:Description: <br /><p>In September 2015\, the Laser Interferomet er Gravitational-wave Observatory (LIGO) initiated the era of gravitationa l wave astronomy (a new window on the universe) with the first direct dete ction of gravitational waves (ripples in the fabric of space-time) resulti ng from the merger of a pair of black holes into a single larger black hol e. In August 2017 the LIGO and VIRGO collaborations announced the first di rect detection of gravitational waves associated with a gamma ray burst an d the electromagnetic emission (visible\, infrared\, radio) of the aftergl ow of a kilonova &mdash\; the spectacular collision of two neutron stars. This marks the beginning of multi-messenger astronomy. The kilonova discov ery was made using the U.S.-based LIGO\; the Europe-based Virgo detector\; and 70 ground- and space-based observatories.</p>\n<p>The Advanced LIGO g ravitational wave detectors are second generation instruments designed and built for the two LIGO observatories in Hanford\, WA and Livingston\, LA. These two identically designed instruments employ coupled optical cavitie s in a specialized version of a Michelson interferometer with 4 kilometer long arms. Resonant optical cavities are used in the arms to increase the interaction time with a gravitational wave\, power recycling is used to in crease the effective laser power and signal recycling is used to improve t he frequency response. In the most sensitive frequency region around 100 H z\, the displacement sensitivity is 10^-19 meters rms\, or about 10 thousa nd times smaller than a proton. In order to achieve this unsurpassed measu rement sensitivity Advanced LIGO employs a wide range of cutting-edge\, hi gh performance technologies\, including an ultra-high vacuum system\; an e xtremely stable laser source\; multiple stages of active vibration isolati on\; super-polished and ion milled optics\, high performance multi-layer d ielectric coatings\; wavefront sensing\; active thermal compensation\; ver y low noise analog and digital electronics\; complex\, nonlinear multi-inp ut\, multi-output control systems\; a custom\, scalable and easily re-conf igurable data acquisition and state control system\; and squeezed light. T he principles of operation\, the numerous control challenges and future di rections in control will be discussed.<br /> More information is available at&nbsp\;<a href="https://nam04.safelinks.protection.outlook.com/?url=htt ps%3A%2F%2Fwww.ligo.caltech.edu%2F&amp\;data=02%7C01%7Cgarrett.clayton%40v illanova.edu%7C4e834a8b8b9243dabd4808d7618ba979%7C765a8de5cf9444f09cafae5b f8cfa366%7C0%7C0%7C637085124782402597&amp\;sdata=5X7t6kSiXLT%2FvGVB9scGghL WuclGr61yUIRvjBBKF%2B4%3D&amp\;reserved=0">https://www.ligo.caltech.edu/</ a></p> END:VEVENT END:VCALENDAR