DESI fiber positioner testing and performance (Conference Presentation)

Schubnell, M.; Aguilar, Jessica Nicole; Ameel, Jon; Caseiro, Stefane; Fanning, Kevin; Freudenstein, Brandon; Gershkovich, Irena; Heetderks, H.; Hörler, Philipp; Leitner, D.; Levi, Michael; Silber, Joseph; Zhan, Sun; Tarlè, G.; Weaverdyck, Curtis; Zhang, Kai

doi:10.1117/12.2311573

Cited by 5 publications

(3 citation statements)

References 0 publications

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“…The DESI project implements this solution using a BeagleBone as CD. 18 EthernetI 2 C: The last architecture discussed is the combination between TCP/IP over ethernet and I 2 C (Fig. 9).…”

Section: Hybrid Architecturesmentioning

confidence: 99%

“…Li et al 17 mention that the use of a serial communication system as CAN bus is justified because "it is widely used among industry circle because of its outstanding reliability, real-time capacity, and flexibility." Also, Schubnell et al 18 propose the use of CAN for DESI but in combination with standard Internet-like communication in a different level. This hybrid approach uses a dedicated CAN bus for each of the 10 segments of the focal plate.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of communication architectures for a fiber-positioning spectrograph

Martínez-García

Lopez-Colino

Garrido

et al. 2019

J. Astron. Telesc. Instrum. Syst.

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The communication architecture required to provide a bidirectional communication between a central command node and a full set of fiber positioners feeding a spectrograph is studied. Six different architectures have been analyzed in terms of communication time and power consumption. These architectures are the result of the combination of three different communication protocols: transmission control protocol/internet protocol (TCP/IP) over ethernet, interintegrated circuit (I 2 C), and controller area network. The design of communication architecture must prioritize between communication time and power consumption. The fastest architecture is the hybrid TCP/IP over ethernet-I 2 C. This architecture requires the least time to provide a full set of coordinates to every fiber positioner less than 50 ms. The most power efficient solution is the I 2 C-I 2 C with demultiplexers. This architecture solves a bidirectional communication between a central node and a full set of fiber positioners requiring only an addition of 27 mW.

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“…The DESI project implements this solution using a BeagleBone as CD. 18 EthernetI 2 C: The last architecture discussed is the combination between TCP/IP over ethernet and I 2 C (Fig. 9).…”

Section: Hybrid Architecturesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of communication architectures for a fiber-positioning spectrograph

Martínez-García

Lopez-Colino

Garrido

et al. 2019

J. Astron. Telesc. Instrum. Syst.

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“…Lab tests indicate we will achieve 1 -2µm RMS position accuracy with one or two correction moves. 13 The University of Michigan is responsible for production of the fiber positioners. 14 At present more than 90% are complete and the remainder are expected in Summer 2018.…”

Section: Fiber Positionersmentioning

confidence: 99%

Overview of the Dark Energy Spectroscopic Instrument

Martini,

Bailey,

Besuner

et al. 2018

Preprint

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The Dark Energy Spectroscopic Instrument (DESI) is under construction to measure the expansion history of the Universe using the Baryon Acoustic Oscillation technique. The spectra of 35 million galaxies and quasars over 14000 square degrees will be measured during the life of the experiment. A new prime focus corrector for the KPNO Mayall telescope will deliver light to 5000 fiber optic positioners. The fibers in turn feed ten broad-band Further author information: (Send correspondence to P.M.

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