  NASA is currently carrying out science and technical studies to identify its
next astronomy flagship mission, slated to begin development in the 2020s. It
has become clear that a Large Ultraviolet/Optical/IR (LUVOIR) Surveyor mission
(primary diameter 12 m, 1000 Ang - 2 micron spectroscopic bandpass) can carry
out the largest number of NASA's exoplanet and astrophysics science goals over
the coming decades. There are technical challenges for several aspects of the
LUVOIR Surveyor concept, including component level technology readiness
maturation and science instrument concepts for a broadly capable ultraviolet
spectrograph. We present the scientific motivation for, and a preliminary
design of, a multiplexed ultraviolet spectrograph to support both the exoplanet
and astrophysics goals of the LUVOIR Surveyor mission concept, the Combined
High-resolution and Imaging Spectrograph for the LUVOIR Surveyor (CHISL). CHISL
includes a high-resolution (R 120,000; 1000 - 1700 Ang) point-source
spectroscopy channel and a medium resolution (R > 14,000 from 1000 - 2000 Ang
in a single observation and R 24,000 - 35,000 in multiple grating settings)
imaging spectroscopy channel. We present the CHISL concept, a small sample of
representative science cases, and the primary technological hurdles. We are
actively engaged in laboratory and flight characterization efforts for
CHISL-enabling technologies as components on sounding rocket payloads under
development at the University of Colorado. We describe two payloads that are
designed to be pathfinder instruments for the high-resolution (CHESS) and
imaging spectroscopy (SISTINE) arms of CHISL. We are carrying out this
instrument design, characterization, and flight-testing today to support the
new start of a LUVOIR Surveyor mission in the next decade.
