archive-edu.com » EDU » C » CALTECH.EDU

Total: 352

Choose link from "Titles, links and description words view":

Or switch to "Titles and links view".
  • The LIGO Web Newsletter - Volume 3, Number 11
    information about LIGO activities In Other LIGO News Comments are welcome Send them to Dave Beckett Editor e mail address beckett ligo caltech edu Here Is What s Inside First Stop The Editor s Page LIGO Activities at Hanford Washington LIGO Activities at Livingston Louisiana Beam Tube Bakeout First Module A Hot Success LIGO Livingston Observatory Construction Update Enthusiasm Abounds As Hanford Hosts Latest NSF Review New Student Employee at

    Original URL path: http://www.ligo.caltech.edu/LIGO_web/9811news/9811main.html (2015-06-02)
    Open archived version from archive


  • The LIGO Web Newsletter - Volume 3, Number 12
    this newsletter an interesting and valuable source of information about LIGO activities In Other LIGO News Comments are welcome Send them to Dave Beckett Editor e mail address beckett ligo caltech edu Here Is What s Inside LIGO Activities at Hanford Washington LIGO Activities at Livingston Louisiana Ladies and Gentlemen Your New Year s Tables Are Ready This Just In New High Altitude Photos of the Livingston Observatory LIGO Participates

    Original URL path: http://www.ligo.caltech.edu/LIGO_web/9812news/9812main.html (2015-06-02)
    Open archived version from archive

  • Matters of Gravity - LIGO Update for Spring 1996
    the vertex and ends of the two arms was signed with Chicago Bridge and Iron the company that performed the successful demonstration test last year They are preparing for full production of the LIGO beam tubes and plan to begin installation by fall of this year The contact for the final design fabrication and installation of the remainder of the vacuum system was signed with Process Systems International and they have begun intensive design work This design work is scheduled to be complete by summer and will be followed by fabrication of the hardware to be delivered to the sites LIGO helped to organize a second Aspen Winter Physics Conference on Gravitational Waves from January 15 21 1996 In addition to the usual technical interchanges among the experimenters present from the various groups around the world there was a special emphasis on data analysis and the intereraction between experiment and theory in the analysis of LIGO data The conference was also the first meeting of the LIGO Research Community an organization of people interested in LIGO science Another meeting of the LIGO Research Community will take place at the May APS meeting in Indianapolis A major effort in LIGO has been to push forward the design of the LIGO detectors After careful consideration the LIGO Project has made a working decision to switch its baseline interferometer design to solid state lasers operating in the near infrared in place of Argon ion lasers operating in the green The new lasers are expected to result in comparable sensitivity and higher reliability in the initial interferometers This decision also defines a clear path for later improvements to the initial interferometers taking advantage of rapidly progressing solid state laser technology and will permit closer cooperation with other gravitational wave groups who have generally adopted

    Original URL path: http://www.ligo.caltech.edu/LIGO_web/news/mog0396.html (2015-06-02)
    Open archived version from archive

  • Matters of Gravity - LIGO Update for Fall 1995
    the final design and fabrication effort Organizationally a LIGO pre Program Advisory Committee has been formed with Peter Saulson Syracuse as its chair The other members are S Finn Northwestern A Giazotto Pisa J Hall JILA W Hamilton LSU C Prescott SLAC A Ruediger MPI Garching This committee will exist only for a year or two During its brief life it will act as both a LIGO Program Advisory Committee PAC and as an External Advisory Committee EAC Before it goes out of existence it will help design a final PAC and EAC The first meeting is scheduled for September 8 9 1995 at Caltech Following the very succesful Aspen Winter Physics Conference on Gravitational Waves and Their Detection see Matters of Gravity Number 5 Spring 1995 a second Aspen Winter Physics Conference has been scheduled for January 15 21 1996 A major theme of the Conference will be the study of advanced interferometers and long range planning The program will include extensive meetings of the LIGO Research Community and several sessions on LISA In the R D program the 40m interferometer at Caltech has been converted to an optically recombined system as a first step toward operating it as a recycled interferometer The optical configuration chosen for the optical recombination is modeled after that planned for the full scale LIGO interferometers and uses a small asymmetry in the arms to produce the required modulation at the point where the difference in arm lengths is sensed New servosystems required to hold the interferometer at its correct operating points are being testing on the 40 m system and noise studies to understand the performance in the new configuration are underway At MIT a suspended interferometer to investigate optical sources of noise at high phase sensitivity is under development This interferometer has

    Original URL path: http://www.ligo.caltech.edu/LIGO_web/news/mog0995.html (2015-06-02)
    Open archived version from archive

  • Matters of Gravity - LIGO Update for Spring 1995
    site will be allowed to settle while the design of the foundations is finalized The site in Louisiana has been purchased by Louisiana State Unviersity and leased to the NSF for LIGO The Environmental Assessment has been completed clearing of the site will begin as soon as the final environmental approval is given A test of the beam tube design is now underway This is a test of the design developed by our contractor Chicago Bridge and Iron It involves a full diameter section of beam tube approximately 40 m long fabricated with the techniques planned for the LIGO field installation The key aspects of the design to be tested are the leak tightness of the welds and the outgassing of the fabricated tube The tube is now under vacuum and a bake out of the tube 140 C for 30 days is planned to start in early February The Ralph M Parsons Company was selected as the Achitect Engineer for the LIGO facilities They will design the building for the two LIGO sites including the foundations and covers for the beam tubes They will also take responsibility for the site planning and eventually provide management oversight for the actual construction Parsons was selected after a nationwide solicitation and a very rigorous competition The final major facilities design contract is for the vacuum system including the chambers pumping system and vacuum instrumentation but excluding the beam tubes Proposals for this contract are due in February and we hope to have the design work underway before summer The major highlight from the R D program is another improvement in the sensitivity of the LIGO 40 m interferometer New test masses were installed in the interferometer These new test masses are of a monolithic design with the mirror surface an integral part

    Original URL path: http://www.ligo.caltech.edu/LIGO_web/news/mog0395.html (2015-06-02)
    Open archived version from archive

  • Matters of Gravity - LIGO Update for Fall 1994
    fabrication of the required 16 km of beam tube The other major engineering design contracts are for the building and site design and for the remainder of the vacuum system The Request for Proposals RFP for the building and site design has been released to qualified Architect Engineering firms and the RFP for the remainder vacuum system is in preparation As exciting as the beginning of construction is some of the best news has come from the R D work The reconstructed 40 m interferometer at Caltech called Mark II to distinguish it from its predecessor has come into full operation now This new version of the interferometer is housed in a new vacuum system one which gives us much more room for testing concepts and hardware for the full scale LIGO interferometers The most significant change to the interferometer itself namely the replacement of the seismic isolation stacks has resulted in an improvement in the low frequency performance of the interferometer by as much as a factor of 100 The next major change to the 40 m interferometer currently underway is the replacement of the old test masses with new ones which have the required supermirror coating deposited on on a polished face of the test mass itself eliminating the need to have a mechanical attachment of a separate mirror to the test mass The preliminary indications are that this change will reduce the amount of thermal noise in the interferometer and give yet another improvement in performance A major effort to demonstrate the optical phase sensitivity required for the LIGO interferometers is underway at MIT A 5 m interferometer is being built with seismically isolated suspended mirrors This interferometer is designed to operate with the same laser power incident on its beamsplitter as the full scale LIGO interferometer

    Original URL path: http://www.ligo.caltech.edu/LIGO_web/news/mog0994.html (2015-06-02)
    Open archived version from archive

  • LIGO Press & Media Kit: Contacts
    VA 22230 ikupec nsf gov LSC Contact Information David Reitze California Institute of Technology Principal Investigator and Director LIGO Laboratory reitze ligo caltech edu 626 395 6274 Albert Lazzarini California Institute of Technology Deputy Director LIGO Laboratory lazzarini a ligo caltech edu 626 395 8444 David H Shoemaker Massachusetts Institute of Technology Head MIT LIGO Laboratory dhs ligo mit edu 617 253 6411 Gabriela Gonzalez Louisiana State University Professor of

    Original URL path: http://www.ligo.caltech.edu/LIGO_web/PR/scripts/contacts.html (2015-06-02)
    Open archived version from archive

  • LIGO Press & Media Kit: Fact Sheet
    Test that these waves propagate at the same speed as light and that the graviton the fundamental particle manifestation of these waves has zero rest mass Test the prediction that the forces the waves exert on matter are perpendicular to the waves direction of travel stretching matter along one perpendicular direction while squeezing it along the other and thereby test the prediction that the graviton has twice the rate of spin as the photon Confirm that black holes do exist and test predictions for the violently pulsating space time curvature believed to accompany two colliding black holes This will be the most stringent test ever of Einstein s general relativity theory Possible payoffs for astronomy Almost all of our present information about the distant universe is afforded us from electromagnetic waves Until the 1930s the only such waves accessible to astronomers were light waves and optical telescopes used to study them revealed a largely serene universe of planets stars and galaxies Then through the 1940s 50s and 60s the march of technology made possible entirely new types of observational tools the radio telescope the infrared telescope the x ray telescope which looked at cosmic electromagnetic waves with wavelengths different from light And because these radiations were different they revealed wholly fresh stores of information They presented another image of the universe a vigorous and often violent side that included quasars pulsars and even the birth throes of stars Gravitational waves being radically different from all electromagnetic waves have the potential to foster yet another revolution in our growing understanding of the universe Among things the study of gravitational waves might reveal are The spiralling together and coalescence of pairs of neutron stars stars made of nearly pure nuclear matter and in some cases the implosion of the coalesced star to form a black hole The swallowing of a neutron star by a black hole and the collisions and coalescences of black holes The birth of a neutron star in the fiery womb of a supernova explosion and the pulsation and spin of this newborn neutron star Starquakes in neutron stars and the details of how these stellar analogs to earthquakes change a star s shape and spin Gravitational waves produced at that first shudder when space and time came into being in the Big Bang creation of the universe And discoveries of which astronomers as yet have no inkling What does a gravitational wave observatory look like The larger the gravitational wave detector the more sensitive it has the potential to be LIGO employs a 4 foot diameter vacuum pipe arranged in the shape of an L with 4 kilometer 2 5 mile arms Since gravitational waves penetrate the earth unimpeded these installations need not be exposed to the sky and are entirely shielded in a concrete cover At the vertex of the L and at the end of each of its arms are test masses that hang from wires and which are outfitted with mirror surfaces These mirrors are

    Original URL path: http://www.ligo.caltech.edu/LIGO_web/PR/scripts/facts.html (2015-06-02)
    Open archived version from archive



  •