AASPoster - Yinan Yu1, S. Mitryk1, D. Sweeney1, A....

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Yinan Yu 1 , S. Mitryk 1 , D. Sweeney 1 , A. Spector 1 , J. Eichholz 1 , D. Donelan 1 , A. Preston 2 , J. Sanjuan 1 , S. Azer 1 , D. Tanner 1 , G. Mueller 1 1 University of Florida 2 Goddard Space Flight Cente INTRODUCTION Over the last 30 years several space based gravitationa wave detector concepts were developed [LAGOS, LISA, BBO 1 University of Florida, 2 Goddard Space Flight Center TIME DELAY INTERFEROMETRY Over the last 30 years several space-based gravitational-wave detector concepts were developed [LAGOS, LISA, BBO, DECIGO, MAGGIE] to observe gravitational waves in the signal-rich μHz to Hz frequency band. All these concepts use laser interferometer to monitor the distance between free falling objects on widely separated spacecraft. The best developed and only project mature enough for a launch in this decade is the Laser Interferometer Space Antenna (LISA), a joint ESA- NASA project. But financial constrains on NASAʼs side and ESAʼs plan to launch a large mission in the 2020-22 timeframe After the laser frequency is stabilized, the frequency/phase noise can be further canceled to the required level in data post- processing, which is known as Time Delay Interferometry (TDI). TDI synthesizes interferometry by appropriately time- shifting the phase measurements of single links and then linearly combining measurement data. The hardware simulation of “static” TDI algorithm (fixed propagation time) has been demonstrated on UFLIS. The noise cancellation nearly met the LISA requirements. The residual noise was dominated by the phasemete ADC noise. We focused then on detailed tests of ended this collaboration earlier this year. Instead, ESA studies slightly smaller mission concepts which would fit under their cost-cap for an L-class mission. Here we continue to use LISA as a reference as the European mission is not yet designed. LISA requirements. The residual noise was dominated by the phasemeter ADC noise. We focused then on detailed tests of the ADCs and improved their performance: Timing Noise Solution: Add a calibration tone to measure the ADC timing jitter Gravitational Waves Gravitational Waves in the in the μHz to to Hz Frequency Band Frequency Band Gravitational Waves (GWs) are propagating perturbations of spacetime created by objects moving in strong gravitational
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This note was uploaded on 12/15/2011 for the course PHY 2020 taught by Professor Staff during the Spring '08 term at University of Florida.

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