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  • LIGO Livingston Observatory News
    of the access and emergency exit doors is almost complete on this arm as well Figure 1 at left gives a view of Arm 2 and its newly built overpass All the site buildings are now jointly occupied by LIGO and its contractors The building contractor is in the process of completing his punch list The vacuum equipment which will house the interferometer has started to arrive at the site

    Original URL path: http://www.ligo.caltech.edu/LIGO_web/9803news/9803liv.html (2015-06-02)
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  • LIGO Caltech News
    noise spectrum The TNI will be optimized for displacement noise measurements using a short test cavity length high finesse coatings for maximum power build up mounting on a common seismic isolation stack etcetera This not only diminishes seismic and shot noise levels it also reduces a number of design requirements relative to a long arm interferometer for example the test mass pointing Progress to date on the TNI has been excellent due in large part to the concentrated expertise in interferometer building that exists within the LIGO group The TNI project began in mid 1997 by assembling a brand new lab basically an optical table with clean room enclosure in the high bay Synchrotron Hall at Caltech By the end of 1997 we had purchased an NPRO laser built a reference cavity and locked our Pre Stabilized Laser PSL following the LIGO PSL design The TNI PSL looks essentially like the LIGO version and the in loop error signal gives a frequency noise of approximately 20 mHz sqrt Hz from 200 Hz to 2 kHz Figure 1 at right shows the measurement of the in loop error signal On this plot 120 dBVrms rt Hz corresponds to 10 mHz rt Hz in frequency space and the scale is 5 dB div Our frequency noise stays below 30 mHz rt Hz from about 200 Hz up to 5 kHz We have not yet measured the noise of our PSL outside the loop but plan to do so using a separate cavity this summer Our recent efforts have focused mainly on details of the TNI design and the purchase of optics for the test mass cavities and for a suspended mode cleaner For the latter we are fortunate to have available many parts first used for a prototype 12 meter suspended mode

    Original URL path: http://www.ligo.caltech.edu/LIGO_web/9803news/9803cit.html (2015-06-02)
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  • LIGO MIT News
    the development of interferometric sensors for gravitational waves including one of the first prototype interferometers the MIT 1 5m system The Gravitation and Cosmology lab occupies one wing of Building 20 adjacent to an anechoic chamber ideal for naps after all nighters and the previous home of some acoustics labs and a recording studio on giant springs a hotbed of rock n roll activity in the late 70 s A labyrinth of offices and labs it includes the high bay used as the shipping dock for radar back in the 40 s This latter space is the present home of the Phase Noise Interferometer see LIGO Newsletter vol 2 no 2 for more on that Featured here is a marvelous overhead crane that runs on a regular switch yard of monorails sort of like an upside down version of the model train on display in another wing Building 20 has always been a good home to our lab Urgent holes required in the walls to accommodate a longer lever arm or to connect a vacuum pump to its experiment were never further than a hefty hammer away The one student one office policy provided the privacy to allow otherwise hopeless graduate students to get through the general exams or at least to fret about them in solitude Countless bicycles and MG carburetors were rebuilt in the shop side by side with someone s latest idea of the best way to mill an optical mount out of solid brass The PDP 11 20 upgraded to 16k of core memory has given way to the library with its mixture of plumbing from above and infinite tangles of ethernet Coffee whether of Ezekiel Muehlner Halpern Dewey or possibly more recent vintage has been burning in the pot on the mezzanine since yesterday Figure

    Original URL path: http://www.ligo.caltech.edu/LIGO_web/9803news/9803mit.html (2015-06-02)
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  • LIGO Hanford Observatory News
    of clean air enclosures will allow researchers to work on optics in a dust free environment Optical tables and a tool chest of optical mounting hardware are now ready for a wide variety of tasks In Figure 1 at left Observatory Scientist Daniel Sigg appears with his new laser The laser is a solid state diode device made from AlGaAs aluminum gallium arsenide Daniel is using the laser to develop a photon calibrator for LIGO interferometers We need to be able to apply small known forces to the LIGO mirrors to calibrate the sensitivity of the LIGO interferometers to mirror displacements The photon calibrator derives its small force from the recoil momentum of photons particles of light that richocet off the mirror surfaces The light from the 1 W laser will be strong enough to deflect a suspended LIGO mirror which weighs 10 7 kg about 24 pounds by distances comparable to the radius of a proton This may sound small but this is well above the noise background in the interferometer which should be approximately 0 001 proton radii At right in Figure 2 Optics Specialist Doug Cook is setting up a Helium Neon laser for testing These old

    Original URL path: http://www.ligo.caltech.edu/LIGO_web/9804news/9804han.html (2015-06-02)
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  • LIGO Livingston Observatory News
    was re registered as the Clermont In 1808 Fulton married his partner s niece Harriet Livingston Harriet was the daughter of Edward Livingston Edward had earlier served simultaneously as the Mayor of New York City and the U S District Attorney for New York State His duties put him in charge of the Chief Customs Inspector for New York Harbor Unfortunately when the Inspector absconded with 50 000 of the public s funds Edward was blamed He was forced to resign from both offices in disgrace as a result of the scandal He moved in 1803 to Louisiana which had just become U S territory thanks to his brother Robert There he established a prosperous law practice in New Orleans and helped secure a Livingston Fulton steamboat monopoly of the New Orleans Territory In 1811 the Fulton designed Pittsburgh built New Orleans was sent south to begin operations between New Orleans and Natchez as the first steamboat on the Mississippi River Edward redeemed himself in the public s eyes through his authorship of the Louisiana civil code and by serving as Andrew Jackson s aide de camp during the War of 1812 In 1819 following an insurrection in Florida and the proclamation of the briefly lived Republic of West Florida Spain ceded its colony of Florida to the United States in exchange for recognition of Spain s sovereignty over Texas The territory ceded included portions of the present state of Louisiana to the north of New Orleans and east of Baton Rouge The civil parishes counties that comprise this portion of Louisiana are still known today as the Florida Parishes Livingston Parish which is one of the Florida Parishes was named for Edward Livingston The Louisiana First Congressional District was represented by Edward Livingston as its first Congressional Representative Livingston later went on to become a US Senator and served as Andrew Jackson s Secretary of State Today that same district is represented by Robert L Livingston the direct descendant of William Livingston Congressman Livingston is Chairman of the House Appropriations Committee He has been a good friend to LIGO I became interested in how Livingston Parish got its name after visiting the old Louisiana State Capital Building which is now a museum On display is one of the original copies of the Louisiana Purchase signed by Robert Livingston I wrote Congressman Livingston to inquire whether he and the other Robert were related He shared some of the details I ve listed here The remainder comes from the Encyclopedia Britannica and the 1925 edition of a British reference called Chambers Encyclopedia of Universal Knowledge Livingston Observatory Hosts First GWIC Meeting Contributed by Sam Finn The directors of twelve different gravitational wave detector projects met in Louisiana on April 22 and 23 as the LIGO Livingston Observatory played host to the first full meeting of the recently established Gravitational Wave International Committee GWIC GWIC s members are the actual gravitational wave detector projects each of which is represented on the committee

    Original URL path: http://www.ligo.caltech.edu/LIGO_web/9804news/9804liv.html (2015-06-02)
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  • LIGO Caltech News
    and management of the Laser Interferometer Gravitational Wave Observatory LIGO including LIGO construction the R D in support of construction and the initial operating phase of LIGO The review was quite successful Summary comments provided by the Committee were generally positive and can be paraphrased as follows LIGO was commended for the management of the civil construction and the construction of the large vacuum system The Hanford Beam Tube achieved a pre baked vacuum of 2 x 10 7 Torr Procurement and evaluation of the detector system components are on the critical path LIGO was advised to be particularly vigilant in managing these activities LIGO was advised that the integration of the detector systems is well planned but the start of installation is critically dependent on the procurement and evaluation of the detector components as mentioned above The Committee indicated that the plan for commissioning the interferometer was well conceived Initial operations planning is at an early stage The Committee reviewed LIGO plans for the transition from construction to operation in terms of personnel and indicated that the planning was thorough The Committee noted that there is little or no schedule contingency left for completion of the LIGO Construction Project

    Original URL path: http://www.ligo.caltech.edu/LIGO_web/9804news/9804cit.html (2015-06-02)
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  • LIGO MIT News
    are up basic utilities are in place and the offices are at last beginning to look like well offices Definite dates for moving are now pinpointed On July 14th a small army of movers will appear in Building 20 our present home On July 17th they will have transported all people and things to NW 17 our new home Quick neat and orderly from start to finish Only the certain

    Original URL path: http://www.ligo.caltech.edu/LIGO_web/9804news/9804mit.html (2015-06-02)
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  • LIGO Hanford Observatory News
    in May is overseeing the first article testing of the BSC SEI The BSC testing is going on in Los Alamos New Mexico at Hytec Inc the company that designed much of the SEI hardware These first article tests include both mechanical fit checks and system performance demonstrations form fit and function The HAM SEI testing is taking place in the lasers and vacuum equipment area LVEA along the Y arm past the output optics chambers for the four km interferometer A view of the test area is shown in Figure 1 at left The large structure with pink translucent curtains shown is a portable clean room enclosure Inside the clean enclosure at left is a HAM chamber and to the right is a wooden mock up of a second ham chamber lower vacuum shell only Outside the enclosure to the right are two support tubes for the isolation system that have been prepared for insertion into the HAM chamber which requires passing them through the wooden mock up The blue cylindrical items in the foreground are the isolation system support piers C Gray H Radkins R Savage B Miller from Hytec and F Asiri have been working over the past several months to perform fit checks and assemble the SEI support structure Others from LIGO including S Whitcomb D Coyne M Barton and H Rong have also been involved in the action at Hanford and provided much appreciated extra manpower The hardware external to the HAM chamber has been located and secured in place the support tubes support table and the bellows that provide the vacuum seal between the support tubes and the HAM chamber have been installed The support tubes are in the process of being bolted to the crossbeams Figure 2 at right is a view of

    Original URL path: http://www.ligo.caltech.edu/LIGO_web/9805news/9805han.html (2015-06-02)
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