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Z-Spec: a broadband direct-detection millimeter-wave spectrometer -- instrument status and first results

Earle, L. and Ade, P. and Aguirre, J. and Aikin, R. and Battle, J. and Bock, J. and Bradford, C. M. and Dragovan, M. and Duband, L. and Glenn, J. and Griffin, G. and Hristov, V. and Maloney, P. and Matsuhara, H. and Naylor, B. and Nguyen, H. and Yun, M. and Zmuidzinas, J. (2006) Z-Spec: a broadband direct-detection millimeter-wave spectrometer -- instrument status and first results. In: Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III. Proceedings of SPIE. No.6275. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 627510. ISBN 9780819463401.

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We report on the status of Z-Spec, including preliminary results of our first astronomical measurements. Z-Spec is a cryogenic, broadband, millimeter-wave grating spectrometer designed for molecular line surveys of galaxies, including carbon monoxide redshift measurements of high-redshift submillimeter sources. With an instantaneous bandwidth of 185-305 GHz, Z-Spec covers the entire 1 mm atmospheric transmission window with a resolving power of 200-400. The spectrometer employs the Waveguide Far-Infrared Spectrometer (WaFIRS) architecture, in which the light propagation is confined within a parallel-plate waveguide, resulting in a minimum mechanical envelope. Its array of 160 silicon-nitride micromesh bolometers is cooled to below 100 mK for background-limited performance. With its sensitivity, broad bandwidth, and compactness, Z-Spec serves as a prototype for a future far-IR spectrometer aboard a cold telescope in space. Z-Spec successfully demonstrated functionality with a partial array of detectors and warm electronics during a week-long engineering run at the Caltech Submillimeter Observatory in June, 2005. We describe the instrument performance evaluated at the telescope and in subsequent laboratory tests and compare these results with design specifications. Following several modifications we returned to the telescope in April, 2006. We present a preliminary astronomical spectrum and discuss our plans to improve sensitivity and throughput to achieve our ultimate science goals.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Ade, P.0000-0002-5127-0401
Aguirre, J.0000-0002-4810-666X
Bock, J.0000-0002-5710-5212
Bradford, C. M.0000-0001-5261-7094
Glenn, J.0000-0001-7527-2017
Additional Information:© 2006 Society of Photo-Optical Instrumentation Engineers (SPIE). We thank the entire CSO staff for their invaluable support as we launch this new instrument. L. Earle is supported by a NASA GSRP fellowship (NGTS-50478). J. Aguirre is funded by a Jansky Fellowship from NRAO. J. Glenn acknowledges an NSF Career Grant in support of Z-Spec (AST-0239270) and an Innovation Award from the Research Corporation (RI0928). This work was supported in part by NASA SARA grants NAGS-11911 and NAGS-12788.
Funding AgencyGrant Number
National Radio Astronomy Observatory (NRAO)UNSPECIFIED
Research CorporationRI0928
Subject Keywords:diffraction grating, millimeter-wave, waveguide, spectroscopy, bolometers, cryogenic, redshift
Series Name:Proceedings of SPIE
Issue or Number:6275
Record Number:CaltechAUTHORS:20190517-141756720
Persistent URL:
Official Citation:L. Earle, P. Ade, J. Aguirre, R. Aikin, J. Battle, J. Bock, C. M. Bradford, M. Dragovan, L. Duband, J. Glenn, G. Griffin, V. Hristov, P. Maloney, H. Matsuhara, B. Naylor, H. Nguyen, M. Yun, and J. Zmuidzinas "Z-Spec: a broadband direct-detection millimeter-wave spectrometer -- instrument status and first results", Proc. SPIE 6275, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III, 627510 (6 July 2006); doi: 10.1117/12.672309;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95572
Deposited By: Tony Diaz
Deposited On:20 May 2019 17:31
Last Modified:09 Mar 2020 13:18

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