A new analytical model, derived rigorously from scalar diffraction theory, accurately fits soft-x-ray measurements of symmetrical profile gold transmission gratings in all diffracted orders. The calibration system selects numerous photon energies by use of a high-resolution grazing-incidence monochromator and a dc e-beam source. Fine-period free-standing gratings exhibit limited performance and require such testing to determine parameters of and select acceptable gratings for use in time-resolved (0.25 ns) spectrographs of known radiometric response. Unfolded spectra yield a Z-pinch plasma peak kT ∼250 eV, total radiated energy ∼900 kJ, and a pinch-driven gold-wall hohlraum Planckian kT ∼86 eV.
© 2004 Optical Society of America
Original Manuscript: September 25, 2003
Revised Manuscript: March 30, 2004
Published: July 1, 2004
Michael C. Hettrick, Michael E. Cuneo, John L. Porter, Larry E. Ruggles, Walter W. Simpson, Mark F. Vargas, and David F. Wenger, "Profiled bar transmission gratings: soft-x-ray calibration of new Kirchoff solutions," Appl. Opt. 43, 3772-3796 (2004)