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Details of the design, fabrication, ground and flight calibration of the HighEnergy Transmission Grating, HETG, on the Chandra X-ray Observatory arepresented after five years of flight experience. Specifics include the theoryof phased transmission gratings as applied to the HETG, the Rowland design ofthe spectrometer, details of the grating fabrication techniques, and theresults of ground testing and calibration of the HETG. For nearly six years theHETG has operated essentially as designed, although it has presented somesubtle flight calibration effects.Comment: 34 pages (including 30 figures), accepted for publication in PAS

TheChandraHigh‐Energy Transmission Grating: Design, Fabrication, Ground Calibration, and 5 Years in Flight