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The CERN Axion Solar Telescope (CAST) has extended its search for solaraxions by using 3He as a buffer gas. At T=1.8 K this allows for larger pressuresettings and hence sensitivity to higher axion masses than our previousmeasurements with 4He. With about 1 h of data taking at each of 252 differentpressure settings we have scanned the axion mass range 0.39 eV < m_a < 0.64 eV.From the absence of excess X-rays when the magnet was pointing to the Sun weset a typical upper limit on the axion-photon coupling of g_ag < 2.3 x 10^{-10}GeV^{-1} at 95% CL, the exact value depending on the pressure setting. KSVZaxions are excluded at the upper end of our mass range, the first time ever forany solar axion search. In future we will extend our search to m_a < 1.15 eV,comfortably overlapping with cosmological hot dark matter bounds.

CAST search for sub-eV mass solar axions with 3He buffer gas