  Adaptive optics (AO) systems using tomographic estimation of
three-dimensional structure of atmospheric turbulence requires vertical
atmospheric turbulence profile, which describes turbulence strength as a
function of altitude as a prior information. We propose a novel method to
reconstruct the profile by applying Multi Aperture Scintillation Sensor (MASS)
method to scintillation data obtained by a Shack-Hartmann wavefront sensor
(SH-WFS). Compared to the traditional MASS, which uses atmospheric
scintillation within 4 concentric annular apertures, the new method utilizes
scintillation in several hundreds of spatial patterns, which are created by
combinations of SH-WFS subapertures. Accuracy of the turbulence profile
reconstruction is evaluated with Bayesian inference, and it is confirmed that
turbulence profile with more than 10 layers can be reconstructed thanks to the
large number of constraints. We demonstrate the new method with a SH-WFS
attached to the 50 cm telescope at Tohoku university and confirm that general
characteristics of atmospheric turbulence profile is reproduced.
