THE AMiBA HEXAPOD TELESCOPE MOUNT

Koch, Patrick M.; Kesteven, Michael; Nishioka, Hiroaki; Jiang, Homin; Lin, Kai-Yang; Umetsu, Keiichi; Huang, Yau-De; Raffin, Philippe; Chen, Ke-Jung; Ibanez-Romano, Fabiola; Chereau, Guillaume; Huang, Chih-Wei L.; Chen, Ming-Tang; Ho, P. T. P.; Pausch, K.; Willmeroth, Klaus; Altamirano, Pablo; Chang, Chia‐Hao; Chang, Shu-Hao; Chang, Su-Wei; Han, Chih-Chiang; Kubo, Derek; Li, Chao-Te; Liao, Yu-Wei; Liu, Guo-Chin; Martin-Cocher, Pierre; Oshiro, Peter; Wang, Fu-Cheng; Wei, Tashun; Wu, Jiun-Huei Proty; Birkinshaw, Mark; Chiueh, Tzihong; Lancaster, Katy; Lo, K. Y.; Martin, Robert N.; Molnar, Sandor M.; Patt, F.; Romeo, Bob

doi:10.1088/0004-637x/694/2/1670

Cited by 40 publications

(25 citation statements)

References 16 publications

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“…One of the further goals of ours is to exploit such an accurately calibrated set of accelerometers in unconventional mechanics like hexapods (Chini 2000;Koch et al 2009;Pál et al 2013). In this case, accelerometers can be mounted onto the base and payload platform as well as on all of the six, topologically identical legs.…”

Section: Discussionmentioning

confidence: 99%

Accurate Telescope Mount Positioning with MEMS Accelerometers

Mészáros¹,

Jaskó²,

Pál³

et al. 2014

Publications of the Astronomical Society of the Pacific

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This paper describes the advantages and challenges of applying microelectromechanical accelerometer systems (MEMS accelerometers) in order to attain precise, accurate and stateless positioning of telescope mounts. This provides a completely independent method from other forms of electronic, optical, mechanical or magnetic feedback or real-time astrometry. Our goal is to reach the sub-arcminute range which is well smaller than the field-of-view of conventional imaging telescope systems. Here we present how this sub-arcminute accuracy can be achieved with very cheap MEMS sensors and we also detail how our procedures can be extended in order to attain even finer measurements. In addition, our paper discusses how can a complete system design be implemented in order to be a part of a telescope control system.Comment: Accepted for publication in PASP, 12 page

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Section: Discussionmentioning

confidence: 99%

Accurate Telescope Mount Positioning with MEMS Accelerometers

Mészáros¹,

Jaskó²,

Pál³

et al. 2014

Publications of the Astronomical Society of the Pacific

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“…3.4. All-Sky Radio Pointing Koch et al (2009) describe how the pointing model of the AMiBA hexapod mount was established with an optical telescope. Further taking into account the parametric model of the platform deformation developed by Liao et al (2013), we carefully rebuilt the pointing model by removing the tilt of the optical telescope due to the platform deformation in order to achieve a better pointing accuracy as required for the more extended AMiBA-13 array.…”

Section: Antenna Alignmentmentioning

confidence: 99%

“…The AMiBA is sited within the Mauna Loa Observatory at an altitude of 3, 400 m on the Big Island of Hawaii. The telescope consists of a novel hexapod mount (Koch et al 2009) with a carbon-fiber-reinforced polymer (CFRP) platform (Raffin et al 2004(Raffin et al , 2006Koch et al 2008;Huang et al 2011). Dual linear polarization heterodyne receivers ), powered by high electron-mobility transistor (HEMT) low-noise amplifiers (LNAs) and monolithic microwave integrated circuit (MMIC) mixers, are co-mounted on the steerable platform.…”

Section: Introductionmentioning

confidence: 99%

AMiBA: CLUSTER SUNYAEV–ZEL’DOVICH EFFECT OBSERVATIONS WITH THE EXPANDED 13-ELEMENT ARRAY

Lin

Nishioka

Wang

et al. 2016

ApJ

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This is the final published version of the article (version of record). It first appeared online via Institute of Physics at http://iopscience.iop.org/article/10.3847/0004-637X/830/2/91/meta. Please refer to any applicable terms of use of the publisher. University of Bristol -Explore Bristol Research General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. ABSTRACTThe Yuan-Tseh Lee Array for Microwave Background Anisotropy (AMiBA) is a co-planar interferometer array operating at a wavelength of 3 mm to measure the Sunyaev-Zel'dovich effect (SZE) of galaxy clusters at arcminute scales. The first phase of operation-with a compact 7-element array with 0.6 m antennas (AMiBA-7)-observed six clusters at angular scales from ¢ 5 to ¢ 23 . Here, we describe the expansion of AMiBA to a 13-element array with 1.2 m antennas (AMiBA-13), its subsequent commissioning, and cluster SZE observing program. The most noticeable changes compared to AMiBA-7 are (1) array re-configuration with baselines ranging from 1.4 m to 4.8 m, allowing us to sample structures between ¢ 2 and ¢ 10 , (2) 13 new lightweight carbon-fiber-reinforced plastic (CFRP) 1.2 m reflectors, and (3) additional correlators and six new receivers. Since the reflectors are co-mounted on and distributed over the entire six-meter CFRP platform, a refined hexapod pointing error model and phase error correction scheme have been developed for AMiBA-13. These effects-entirely negligible for the earlier central close-packed AMiBA-7 configuration-can lead to additional geometrical delays during observations. Our correction scheme recovers at least 80±5% of thepoint-source fluxes. We, therefore, apply an upward correcting factor of 1.25 to our visibilities to correct for phase decoherence, and a±5% systematic uncertainty is added in quadrature with our statistical errors. We demonstrate the absence of further systematics with a noise level consistent with zero in stacked uv-visibilities. From the AMiBA-13 SZE observing program, we present here maps of a subset of 12 clusters with signal-to-noise ratios above five. We demonstrate combining AMiBA-7 with AMiBA-13 observations on Abell 1689, by jointly fitting their data to a generalized Navarro-Frenk-White model. Our cylindrically integrated Compton-y values for five radii are consistent with results from the Berkeley-IllinoisMaryland Array, the Owens Valley Radio Observatory, the Sunyaev-Zel'dovich Array, and the Planck Observatory. We also report the first targeted SZE detection toward the optically selected cluster RCS J1447 +0828, and we demonstrate the ability of AMiBA SZE data to serve as a proxy for the total cluster mass. Finally, we show that our AMiBA-SZE derived cluster masses are consistent with recent lensing mass measurements in the literature.

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“…This instrument is capable of perform optical spectroscopy. Probably the most spectacular instrument driven by a hexapod is the AMIBA mount (Koch et al 2009), a standalone radio telescope system. Radio interferometer arrays also apply hexapods (Huang, Raffin & Chen 2011).…”

Section: Introductionmentioning

confidence: 99%

A Hexapod Design for All-sky Sidereal Tracking

Pál

Mészáros

Jaskó

et al. 2016

PASP

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In this paper we describe a hexapod-based telescope mount system intended to provide sidereal tracking for the Fly's Eye Camera project -an upcoming moderate, 21′′ /pixel resolution all-sky survey. By exploiting such a kind of meter-sized telescope mount, we get a device which is both capable of compensating for the apparent rotation of the celestial sphere and the same design can be used independently from the actual geographical location. Our construction is the sole currently operating hexapod telescope mount performing dedicated optical imaging survey with a sub-arcsecond tracking precision.

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THE AMiBA HEXAPOD TELESCOPE MOUNT

Cited by 40 publications

References 16 publications

Accurate Telescope Mount Positioning with MEMS Accelerometers

Accurate Telescope Mount Positioning with MEMS Accelerometers

AMiBA: CLUSTER SUNYAEV–ZEL’DOVICH EFFECT OBSERVATIONS WITH THE EXPANDED 13-ELEMENT ARRAY

A Hexapod Design for All-sky Sidereal Tracking

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