28 September 2004 The Thirty Meter Telescope site testing system
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The Thirty Meter Telescope (TMT) site testing team are developing a suite of instruments to measure the atmospheric and optical characteristics of candidate TMT sites. Identical sets of robotically operating instruments will be placed at each candidate site. The fully developed system will comprise of a combined MASS/DIMM. a SODAR, tower mounted thermal probes and a portable DIMM. These instruments have overlapping altitude coverage and provide a measure of the C2n profile from the ground up with sufficient resolution to make conclusions about the ground layer and high altitude turbulence characteristics. The overlapping altitude coverage is essential to ensure consistency between these very different instruments. In addition to checking for consistency in the overlap regions, procedures are being used to cross check between instruments, i.e. the calculation of the isoplanatic angle from both the MASS and DIMM and that the integrals of the C2n profiles from the MASS, SODAR and 30m tower gives the same r0 value as measured by the DIMM. We discuss a variation of the traditional DIMM system in which we employ a continuous drift mode readout technique giving a maximum of nearly 300 samples per second. Findings of our major equipment testing campaigns and first field deployment are presented that demonstrate our progress in developing a rigorous approach to site testing.
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Warren Skidmore, Warren Skidmore, Matthias Schock, Matthias Schock, Andrei A. Tokovinin, Andrei A. Tokovinin, George Djorgovski, George Djorgovski, Alistair R. Walker, Alistair R. Walker, Robert D. Blum, Robert D. Blum, Tony Travouillon, Tony Travouillon, Juan Seguel, Juan Seguel, Edison E. Bustos, Edison E. Bustos, David Walker, David Walker, Joselina Vasquez, Joselina Vasquez, Paul E. Gillett, Paul E. Gillett, "The Thirty Meter Telescope site testing system", Proc. SPIE 5489, Ground-based Telescopes, (28 September 2004); doi: 10.1117/12.549384; https://doi.org/10.1117/12.549384

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