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We describe an initiative to build and use the Dark Energy Spectrometer(DESpec), a wide-field spectroscopic survey instrument for the Blanco 4 metertelescope at Cerro Tololo InterAmerican Observatory (CTIO) in Chile. A newsystem with about 4000 robotically positioned optical fibers will beinterchangeable with the CCD imager of the existing Dark Energy Camera (DECam),accessing a field of view of 3.8 square degrees in a single exposure. Theproposed instrument will be operated by CTIO and available for use by theastronomy community. Our collaboration proposes to use DESpec to conduct awide, deep spectroscopic survey to study Dark Energy. In a survey of about 350nights, the DESpec collaboration proposes to obtain spectroscopic redshifts forabout 8 million galaxies over 5000 square degrees selected from the Dark EnergySurvey (DES). This Dark Energy Spectroscopic Survey will advance our knowledgeof cosmic expansion and structure growth significantly beyond that obtainablewith imaging-only surveys. Since it adds a spectroscopic third dimension to thesame sky as DES, DESpec will enable increasingly precise techniques todiscriminate among alternative explanations of cosmic acceleration, such asDark Energy and Modified Gravity.

The Dark Energy Spectrometer (DESpec): A Multi-Fiber Spectroscopic Upgrade of the Dark Energy Camera and Survey for the Blanco Telescope