Turbulence profiler MASS: First tests and plans A. Tokovinin CTIO edu/edu/~atokovin/profiler.

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Presentation transcript:

Turbulence profiler MASS: First tests and plans A. Tokovinin CTIO edu/edu/~atokovin/profiler

MASS = Multi-Aperture Scintillation Sensor Need for a simple, cheap profile monitor: single-star profiler Presursor: “Scintillometer” of Ochs et al. MASS: better hardware, theory and signal processing (polychromatic scintillation; photon counting; de- biasing)

The principle

Weighting functions

Profile restoration Six fixed layers (0.5,1,2,4,8,16 km) Least-squares solution: Cn2 can be negative… -> Min. Chi-squared with sign constraint! Three “floating” layers: free intensities and altitudes (6 parameters) Direct computing of moments

Simulations: one layer

Simulations: two layers

The instrument Detector box (4 PMTs, 1 stepper motor, 7 microprocessors) Feeding telescope (14 cm, off-axis) PC + RT Linux (RS-485 interface) Software Guiding TV Auto-guiding

Real-time data processing

Generalized mode Add “virtual propagation” of 0.5 km to sense low turbulence Constraints: <4 arcsec. guiding, good optics Extensive computer simulations Tested: seeing worse than DIMM… Ground layer? Conclusion: do not use gen. mode!

One night of data: May 2-3, 2002 Profile: fixed layers Profile: floating layers Comparison with DIMM Residuals

More profiles… May 20 and 21

A night with good seeing: April 17-18

Comparison with DIMM

Two MASS instruments

Immediate plans (2002) Accumulate data for Cerro Tololo Move to Cerro Pachon SCIDAR calibrations (La Silla, Mauna Kea)

Instrument development (2003) Optimization: smaller outer apertures Simplify the instrument (no gen-mode) Simplify data acquisition (no RT Linux) Couple with DIMM in a single instrument Make it all robotic ( pointing !!! )

MASS +DIMM

Pointing