HARP-B: a 350-GHz 16-element focal plane array for the James Clerk Maxwell telescope

Smith, Harry; Hills, R. E.; Withington, S.; Richer, J.; Leech, J.; Williamson, R.; Gibson, Hugh; Dace, Roger; Ananthasubramanian, P. G.; Barker, R. W.; Baldwin, Robert; Stevenson, Howard M.; Doherty, Peter; Molloy, Dennis; Quy, Victor; Lush, Chris; Hales, S. E. G.; Dent, W. R. F.; Pain, Ian; Wall, R. F.; Hastings, Peter; Graham, Brenda; Baillie, Tom; Laidlaw, Ken; Bennett, Richard J.; Laidlaw, Ian; Duncan, William; Ellis, Maureen A.; Redman, R. O.; Wooff, Robert; Yeung, K.; Fitzsimmons, Joeleff; Avery, L. W.; Derdall, D.; Josephson, Dean; Anthony, André; Atwal, Raj; Chylek, Tomas; Shutt, Dean J.; Friberg, Per; Rees, Nicholas P.; Philips, Robin C. M.; Kroug, M.; Klapwijk, T. M.; Zijlstra, T.

doi:10.1117/12.459674

Cited by 18 publications

(3 citation statements)

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“…The 12 CO J=3→2 transition traces the warmer and denser regions of the molecular gas that are more directly related to star forming regions (Wilson et al 2009, and references therein). The entire JCMT NGLS sample consists of 155 nearby galaxies, each with spectral line observations at 345 GHz, made with the Heterodyne Array Receivers Program for B-band (HARP-B) receiver (Smith et al 2003). The details of the NGLS survey can be found in Wilson et al (2012).…”

Section: Introductionmentioning

confidence: 99%

The James Clerk Maxwell Telescope Nearby Galaxies Legacy Survey – IX. 12CO J = 3→2 observations of NGC 2976 and NGC 3351

Tan¹,

Leech²,

Rigopoulou³

et al. 2013

Monthly Notices of the Royal Astronomical Society

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We present 12 CO J=3→2 maps of NGC 2976 and NGC 3351 obtained with the James Clerk Maxwell Telescope (JCMT), both early targets of the JCMT Nearby Galaxy Legacy Survey (NGLS). We combine the present observations with 12 CO J=1→0 data and find that the computed 12 CO J=3→2 to 12 CO J=1→0 line ratio (R 31 ) agrees with values measured in other NGLS field galaxies. We compute the M H2 value and find that it is robust against the value of R 31 used. Using Hi data from the The Hi Nearby Galaxy Survey (THINGS) survey, we find a tight correlation between surface density of H 2 and star formation rate density for NGC 3351 when 12 CO J=3→2 data are used. Finally, we compare the 12 CO J=3→2 intensity with the PAH 8 µm surface brightness and find a good correlation in the high surface brightness regions. We extend this study to include all 25 Spitzer Infrared Nearby Galaxies Survey (SINGS) galaxies within the NGLS sample and find a tight correlation at large spatial scales. We suggest that both PAH 8 µm and 12 CO J=3→2 are likely to originate in regions of active star formation.

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Section: Introductionmentioning

confidence: 99%

The James Clerk Maxwell Telescope Nearby Galaxies Legacy Survey – IX. 12CO J = 3→2 observations of NGC 2976 and NGC 3351

Tan¹,

Leech²,

Rigopoulou³

et al. 2013

Monthly Notices of the Royal Astronomical Society

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“…The work described in this paper follows the installation of the ACSIS (Auto-Correlation Spectral Imaging System) digital autocorrelation spectrometer at the JCMT (Buckle et al 2009). ACSIS was developed to provide a state-of-the-art spectroscopic backend for the then forthcoming 16-element SIS mixer-based HARP focal-plane array (Smith et al 2003). As well as having the capability to deal with 16 receptors at once, the ACSIS correlator was designed to be capable of delivering new wideband (up to 2 GHz) and high-resolution (down to 30 kHz) observing modes.…”

Section: Introductionmentioning

confidence: 99%

Automated reduction of sub-millimetre single-dish heterodyne data from the James Clerk Maxwell Telescope using orac-dr

Jenness

Currie

Tilanus

et al. 2015

Mon. Not. R. Astron. Soc.

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With the advent of modern multi-detector heterodyne instruments that can result in observations generating thousands of spectra per minute it is no longer feasible to reduce these data as individual spectra. We describe the automated data reduction procedure used to generate baselined data cubes from heterodyne data obtained at the James Clerk Maxwell Telescope. The system can automatically detect baseline regions in spectra and automatically determine regridding parameters, all without input from a user. Additionally it can detect and remove spectra suffering from transient interference effects or anomalous baselines. The pipeline is written as a set of recipes using the ORAC-DR pipeline environment with the algorithmic code using Starlink software packages and infrastructure. The algorithms presented here can be applied to other heterodyne array instruments and have been applied to data from historical JCMT heterodyne instrumentation.

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“…Impressive performance was also reported above the superconducting gap using devices fabricated from new materials such as NbN or NbTiN in conjunction with careful analysis of the device behavior. In addition to the basic requirement for a good mixer, such as low noise temperature and wide bandwidth, the design must be made arrayable [1], [2] so that a large number of SIS mixers can be fabricated cheaply and rapidly. An easy to fabricate design becomes even more essential at THz frequencies and also when balanced or single sideband operation is required.…”

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confidence: 99%

A 650 GHz Unilateral Finline SIS Mixer Fed by a Multiple Flare-Angle Smooth-Walled Horn

Tan

Yassin

Grimes

et al. 2012

IEEE Trans. THz Sci. Technol.

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We report the design and successful operation of an superconductor-insulator-superconductor (SIS) mixer operating near the superconducting gap of niobium. A key feature of this design is the employment of a unilateral finline taper to transform the waveguide modes to microstrip signals. This transition is easy to design since it can be rigorously modeled, and also easy to fabricate being a single-layer structure. We will show that unilateral finline mixers have important advantages at THz frequencies since they exhibit wideband operation at both radio frequency (RF) and intermediate frequency (IF), allow elegant on-chip integration of the mixer circuits and result in an extremely simple mixer block that does not require a backshort or any mechanical tuners. The mixer we describe below is fed by a multiple flare-angle smooth-walled horn which exhibits beam pattern characteristic comparable to the conventional corrugated horn and yet is much easier to fabricate.In this paper, we shall present a brief discussion of the testing of the multiple flare-angle horn and detailed description of the design and testing of the mixer, covering 100 GHz bandwidth centered at 650 GHz. In particular, we will present full electromagnetic design description of the mixer chip including the superconducting effects, and the heterodyne properties of the mixer using quantum mixing theory. Mixer performance tests that we carried out from 595 to 702 GHz gave a best receiver noise temperature of 145 K at 600 GHz, corrected for a 75 m beam splitter.Finally, we performed a thorough analysis of the mixer performance, comparing the experimental results with theoretical models. Our investigation demonstrated that unilateral finline mixers fed by a multiple flare-angle horn can yield performance comparable to conventional designs, hence are suitable for large format mixer array at THz frequencies.

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HARP-B: a 350-GHz 16-element focal plane array for the James Clerk Maxwell telescope

Cited by 18 publications

References 0 publications

The James Clerk Maxwell Telescope Nearby Galaxies Legacy Survey – IX. 12CO J = 3→2 observations of NGC 2976 and NGC 3351

The James Clerk Maxwell Telescope Nearby Galaxies Legacy Survey – IX. 12CO J = 3→2 observations of NGC 2976 and NGC 3351

Automated reduction of sub-millimetre single-dish heterodyne data from the James Clerk Maxwell Telescope using orac-dr

A 650 GHz Unilateral Finline SIS Mixer Fed by a Multiple Flare-Angle Smooth-Walled Horn

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