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We observed the bright unidentified TeV gamma-ray source HESS J1616-508 withthe X-ray Imaging Spectrometers onboard the Suzaku satellite. No X-raycounterpart was found to a limiting flux of 3.1e-13 erg/s/cm^2 in the 2--10 keVband, which is some 60 times below the gamma-ray flux in the 1--10 TeV band.This object is bright in TeV gamma-rays but very dim in the X-ray band, andthus is one of the best examples in the Galaxy of a "dark particleaccelerator." We also detected soft thermal emission with kT=0.3--0.6 keV nearthe location of HESSJ1616. This may be due to the dust grain scattering halofrom the nearby bright supernova remnant RCW103.Comment: 10 pages, 9 figures. Accepted for publication in PASJ Suzaku Special  Issue (vol. 59 sp. 1

Suzaku Observations of HESS J1616—508: Evidence for a Dark Particle Accelerator