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Proceedings Paper

The Multi Aperture Scintillation Sensor (MASS) used in the site selection of the Thirty Meter Telescope (TMT)
Author(s): S. G. Els; M. Schoeck; J. Seguel; W. Skidmore; D. Walker; A. Tokovinin; V. Kornilov; R. Riddle; T. Travouillon; E. Bustos; J. Vasquez; R. Blum; B. Gregory; P. Gillett
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Paper Abstract

One of the main tools used in the TMT site testing campaign is the turbulence profiler MASS. We describe empirical investigations and a side by side comparison of two MASS systems which were performed in order to identify the accuracy of MASS turbulence data and its dependence on the instrument calibration. The accuracy of the total seeing delivered by the TMT MASS systems is found to be better than 0"05. The combination of MASS and DIMM allows to observe the seeing within the first few hundred meters of the atmosphere and can be used to investigate possible correlations with meteorological parameters measured close to the ground. We also compare the detection of clouds and cirrus by means of MASS data (LOSSAM method) with measurements of the thermal emission of clouds using a net radiation sensor. These methods are compared with the visual cloud detection using all sky cameras.

Paper Details

Date Published: 10 July 2008
PDF: 10 pages
Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 701222 (10 July 2008); doi: 10.1117/12.788954
Show Author Affiliations
S. G. Els, Cerro Tololo Inter-American Observatory (Chile)
TMT Observatory Corp. (United States)
M. Schoeck, TMT Observatory Corp. (United States)
J. Seguel, Cerro Tololo Inter-American Observatory (Chile)
W. Skidmore, TMT Observatory Corp. (United States)
D. Walker, Cerro Tololo Inter-American Observatory (Chile)
A. Tokovinin, Cerro Tololo Inter-American Observatory (Chile)
V. Kornilov, Sternberg Astronomical Institute (Russia)
R. Riddle, TMT Observatory Corp. (United States)
T. Travouillon, TMT Observatory Corp. (United States)
E. Bustos, Cerro Tololo Inter-American Observatory (Chile)
J. Vasquez, Cerro Tololo Inter-American Observatory (Chile)
R. Blum, National Optical Astronomy Observatory (United States)
B. Gregory, Cerro Tololo Inter-American Observatory (Chile)
P. Gillett, TMT Observatory Corp. (United States)

Published in SPIE Proceedings Vol. 7012:
Ground-based and Airborne Telescopes II
Larry M. Stepp; Roberto Gilmozzi, Editor(s)

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