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\medskip
\centerline {\Large \bf PROJECT SUMMARY }
\bigskip
\centerline {\large \bf Development of SuperCam, a Submillimeter-wave}
\centerline {\large \bf Superheterodyne Camera for the Heinrich Hertz Telescope}

\vspace{0.5cm}

Funds are requested to develop the world's most powerful, submillimeter-wave 
heterodyne array receiver for use at the Cassegrain
focus of the 10-meter Heinrich Hertz Telescope (HHT). 
The array will operate in the astrophysically rich
870~$\mu$m atmospheric window, where the HHT has the
highest aperture efficiency of any submillimeter telescope in the 
world and excellent atmospheric transmission more than 40\% of the
time. The proposed Superheterodyne Camera (SuperCam) will
be an $8\times 8$, integrated receiver array fabricated using leading-edge 
mixer, local oscillator, low-noise amplifier, cryogenic, and digital 
signal processing technologies. 

\section*{What is the intellectual merit of the proposed activity?}

SuperCam will be an order of magnitude larger than any existing spectroscopic
imaging array at submillimeter wavelengths.   The exceptional 
mapping speed that will result, combined with the efficiency and angular
resolution achievable with the HHT, 
will make SuperCam the most uniquely-powerful
instrument for probing the history of star formation in our Galaxy 
and the distant Universe. 
SuperCam will be used to answer fundamental questions 
about the physics and chemistry of molecular clouds
in the Galaxy and their direct relation to
star and planet formation.  Through Galactic surveys, particularly in
CO and its 
isotopomers, the impact of Galactic environment on these phenomena
will be realized.
These studies will serve as ``finder charts'' for future focused research
(e.g. with ALMA) and markedly improve the interpretation,
and enhance the value of numerous contemporary surveys.  Application
of the SuperCam spectrometer system to the existing 7-pixel 
DesertSTAR array will allow application of these studies to the realm
of external galaxies. 
These developments will put the HHT, and astronomy in Arizona, at the
forefront of research \& technology in this wavelength regime for 
years to come. 

\section*{What are the broader impacts of the proposed activity?}

The proposed 345~GHz array will become a 
facility instrument on the HHT, available to all users. A key project 
for the instrument will be to conduct sensitive, high
resolution CO and $^{13}$CO $J=3\rightarrow 2$ surveys of 
the Galactic Plane.  Definitive and comprehensive science 
products from that survey and its many synergistic 
collaborations will be made available to the astronomical 
community via the Web in a timely manner.  A Guest Observer Program 
will be established to facilitate use of the array by outside users.
Finally, as was the case with DesertSTAR, the design and
fabrication of the SuperCam array will be an interdisciplinary,
team effort involving students from astronomy, optical
sciences, and electrical engineering.  Astronomical instrumentation is
becoming ever more complex, requiring the talents of many individuals
to bring them to fruition.  Providing students with both technical 
training and team-work experience increases their probability of 
of success not only within astronomy, but society as a whole. 

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