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NASA is currently carrying out science and technical studies to identify itsnext astronomy flagship mission, slated to begin development in the 2020s. Ithas become clear that a Large Ultraviolet/Optical/IR (LUVOIR) Surveyor mission(primary diameter 12 m, 1000 Ang - 2 micron spectroscopic bandpass) can carryout the largest number of NASA's exoplanet and astrophysics science goals overthe coming decades. There are technical challenges for several aspects of theLUVOIR Surveyor concept, including component level technology readinessmaturation and science instrument concepts for a broadly capable ultravioletspectrograph. We present the scientific motivation for, and a preliminarydesign of, a multiplexed ultraviolet spectrograph to support both the exoplanetand astrophysics goals of the LUVOIR Surveyor mission concept, the CombinedHigh-resolution and Imaging Spectrograph for the LUVOIR Surveyor (CHISL). CHISLincludes a high-resolution (R 120,000; 1000 - 1700 Ang) point-sourcespectroscopy channel and a medium resolution (R > 14,000 from 1000 - 2000 Angin a single observation and R 24,000 - 35,000 in multiple grating settings)imaging spectroscopy channel. We present the CHISL concept, a small sample ofrepresentative science cases, and the primary technological hurdles. We areactively engaged in laboratory and flight characterization efforts forCHISL-enabling technologies as components on sounding rocket payloads underdevelopment at the University of Colorado. We describe two payloads that aredesigned to be pathfinder instruments for the high-resolution (CHESS) andimaging spectroscopy (SISTINE) arms of CHISL. We are carrying out thisinstrument design, characterization, and flight-testing today to support thenew start of a LUVOIR Surveyor mission in the next decade.

CHISL: The Combined High-resolution and Imaging Spectrograph for the LUVOIR Surveyor