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Dive into the research topics where Joy Didier is active.

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Featured researches published by Joy Didier.


Proceedings of SPIE | 2011

A cryogenic half-wave plate polarimeter using a superconducting magnetic bearing

Jeff Klein; Asad M. Aboobaker; Peter A. R. Ade; François Aubin; C. Baccigalupi; Chaoyun Bao; J. Borrill; Daniel Chapman; Joy Didier; M. Dobbs; B. Gold; William F. Grainger; Shaul Hanany; J. Hubmayr; Seth Hillbrand; Julien Grain; A. H. Jaffe; B. R. Johnson; Terry Jay Jones; T. S. Kisner; Andrei Korotkov; Sam Leach; Adrian T. Lee; Lorne Levinson; M. Limon; Kevin MacDermid; Tomotake Matsumura; Amber D. Miller; Michael Milligan; Enzo Pascale

We present the design and measured performance of the superconducting magnetic bearing (SMB) that was used successfully as the rotation mechanism in the half-wave plate polarimeter of the E and B Experiment (EBEX) during its North American test flight. EBEX is a NASA-supported balloon-borne experiment that is designed to measure the polarization of the cosmic microwave background. In this implementation the half-wave plate is mounted to the rotor of an SMB that is operating at the sink temperature of 4 K. We demonstrate robust, remote operation on a balloon-borne payload, with angular encoding accuracy of 0.01°. We find rotational speed variation to be 0.2% RMS. We measure vibrational modes and find them to be consistent with a simple SMB model. We search for but do not find magnetic field interference in the detectors and readout. We set an upper limit of 3% of the receiver noise level after 5 minutes of integration on such interference. At 2 Hz rotation we measure a power dissipation of 56 mW. If this power dissipation is reduced, such an SMB implementation is a candidate for low-noise space applications because of the absence of stick-slip friction and low wear.


The Astrophysical Journal | 2012

The impact of the spectral response of an achromatic half-wave plate on the measurement of the cosmic microwave background polarization

Chaoyun Bao; B. Gold; C. Baccigalupi; Joy Didier; Shaul Hanany; A. H. Jaffe; B. R. Johnson; Sam Leach; T. Matsumura; Amber Miller; D. T. O'Dea

We study the impact of the spectral dependence of the linear polarization rotation induced by an achromatic half-wave plate on measurements of cosmic microwave background polarization in the presence of astrophysical foregrounds. We focus on the systematic effects induced on the measurement of inflationary gravitational waves by uncertainties in the polarization and spectral index of Galactic dust. We find that for the experimental configuration and noise levels of the balloon-borne EBEX experiment, which has three frequency bands centered at 150, 250, and 410 GHz, a crude dust subtraction process mitigates systematic effects to below detectable levels for 10% polarized dust and tensor-to-scalar ratio of as low as r = 0.01. We also study the impact of uncertainties in the spectral response of the instrument. With a top-hat model of the spectral response for each band, characterized by band center and bandwidth, and with the same crude dust subtraction process, we find that these parameters need to be determined to within 1 and 0.8 GHz at 150 GHz; 9 and 2.0 GHz at 250 GHz; and 20 and 14 GHz at 410 GHz, respectively. The approach presented in this paper is applicable to other optical elements that exhibit polarization rotation as a function of frequency.


Proceedings of SPIE | 2014

The performance of the bolometer array and readout system during the 2012/2013 flight of the e and B experiment (EBEX)

Kevin MacDermid; Asad M. Aboobaker; Peter A. R. Ade; François Aubin; C. Baccigalupi; Kevin Bandura; Chaoyun Bao; J. Borrill; Daniel Chapman; Joy Didier; M. Dobbs; Julien Grain; William F. Grainger; Shaul Hanany; Kyle Helson; Seth Hillbrand; G. C. Hilton; Hannes Hubmayr; K. D. Irwin; B. R. Johnson; Andrew Jaffe; Terry Jay Jones; Ted Kisner; Jeff Klein; Andrei Korotkov; Adrian T. Lee; Lorne Levinson; M. Limon; Amber Miller; Michael Milligan

EBEX is a balloon-borne telescope designed to measure the polarization of the cosmic microwave background radiation. During its eleven day science flight in the Austral Summer of 2012, it operated 955 spider-web transition edge sensor (TES) bolometers separated into bands at 150, 250 and 410 GHz. This is the first time that an array of TES bolometers has been used on a balloon platform to conduct science observations. Polarization sensitivity was provided by a wire grid and continuously rotating half-wave plate. The balloon implementation of the bolometer array and readout electronics presented unique development requirements. Here we present an outline of the readout system, the remote tuning of the bolometers and Superconducting QUantum Interference Device (SQUID) amplifiers, and preliminary current noise of the bolometer array and readout system.


Proceedings of SPIE | 2014

STARS: a software application for the EBEX autonomous daytime star cameras

Daniel Chapman; Joy Didier; Shaul Hanany; Seth Hillbrand; M. Limon; Amber Miller; Britt Reichborn-Kjennerud; G. S. Tucker; Yury Vinokurov

The E and B Experiment (EBEX) is a balloon-borne telescope designed to probe polarization signals in the CMB resulting from primordial gravitational waves, gravitational lensing, and Galactic dust emission. EBEX completed an 11 day flight over Antarctica in January 2013 and data analysis is underway. EBEX employs two star cameras to achieve its real-time and post-flight pointing requirements. We wrote a software application called STARS to operate, command, and collect data from each of the star cameras, and to interface them with the main flight computer. We paid special attention to make the software robust against potential in-flight failures. We report on the implementation, testing, and successful in flight performance of STARS.


Proceedings of SPIE | 2010

First implementation of TES bolometer arrays with SQUID-based multiplexed readout on a balloon-borne platform

François Aubin; Asad M. Aboobaker; Peter A. R. Ade; C. Baccigalupi; Chaoyun Bao; J. Borrill; C. M. Cantalupo; Daniel Chapman; Joy Didier; M. Dobbs; William F. Grainger; Shaul Hanany; J. Hubmayr; P. Hyland; Seth Hillbrand; A. H. Jaffe; B. R. Johnson; Terry Jay Jones; T. S. Kisner; Jeff Klein; Andrei Korotkov; Sam Leach; Adrian T. Lee; M. Limon; Kevin MacDermid; Tomotake Matsumura; X. Meng; Amber Miller; Michael Milligan; Daniel Polsgrove

EBEX (the E and B EXperiment) is a balloon-borne telescope designed to measure the polarisation of the cosmic microwave background radiation. During a two week long duration science flight over Antarctica, EBEX will operate 768, 384 and 280 spider-web transition edge sensor (TES) bolometers at 150, 250 and 410 GHz, respectively. The 10-hour EBEX engineering flight in June 2009 over New Mexico and Arizona provided the first usage of both a large array of TES bolometers and a Superconducting QUantum Interference Device (SQUID) based multiplexed readout in a space-like environment. This successful demonstration increases the technology readiness level of these bolometers and the associated readout system for future space missions. A total of 82, 49 and 82 TES detectors were operated during the engineering flight at 150, 250 and 410 GHz. The sensors were read out with a new SQUID-based digital frequency domain multiplexed readout system that was designed to meet the low power consumption and robust autonomous operation requirements presented by a balloon experiment. Here we describe the system and the remote, automated tuning of the bolometers and SQUIDs. We compare results from tuning at float to ground, and discuss bolometer performance during flight.


Proceedings of SPIE | 2014

A LEKID-based CMB instrument design for large-scale observations in Greenland

Derek Araujo; Peter A. R. Ade; J. R. Bond; Kristi J. Bradford; Daniel Chapman; George Che; Peter K. Day; Joy Didier; S. Doyle; H. K. Eriksen; D. Flanigan; Christopher Groppi; Seth Hillbrand; B. R. Johnson; Glenn Jones; M. Limon; Amber Miller; P. Mauskopf; Heather McCarrick; Tony Mroczkowski; Britt Reichborn-Kjennerud; Brian Smiley; Joshua Sobrin; I. K. Wehus; Jonas Zmuidzinas

We present the results of a feasibility study, which examined deployment of a ground-based millimeter-wave polarimeter, tailored for observing the cosmic microwave background (CMB), to Isi Station in Greenland. The instrument for this study is based on lumped-element kinetic inductance detectors (LEKIDs) and an F/2.4 catoptric, crossed-Dragone telescope with a 500 mm aperture. The telescope is mounted inside the receiver and cooled to < 4 K by a closed-cycle 4He refrigerator to reduce background loading on the detectors. Linearly polarized signals from the sky are modulated with a metal-mesh half-wave plate that is rotated at the aperture stop of the telescope with a hollow-shaft motor based on a superconducting magnetic bearing. The modular detector array design includes at least 2300 LEKIDs, and it can be configured for spectral bands centered on 150 GHz or greater. Our study considered configurations for observing in spectral bands centered on 150, 210 and 267 GHz. The entire polarimeter is mounted on a commercial precision rotary air bearing, which allows fast azimuth scan speeds with negligible vibration and mechanical wear over time. A slip ring provides power to the instrument, enabling circular scans (360 degrees of continuous rotation). This mount, when combined with sky rotation and the latitude of the observation site, produces a hypotrochoid scan pattern, which yields excellent cross-linking and enables 34% of the sky to be observed using a range of constant elevation scans. This scan pattern and sky coverage combined with the beam size (15 arcmin at 150 GHz) makes the instrument sensitive to 5 < ` < 1000 in the angular power spectra.


arXiv: Instrumentation and Methods for Astrophysics | 2017

Temperature calibration of the E and B Experiment

François Aubin; Asad M. Aboobaker; Chaoyun Bao; Christopher Geach; Shaul Hanany; Terry Jay Jones; Jeff Klein; Michael Milligan; Kate Raach; Karl Young; Kyle Zilic; Kyle Helson; Andrei Korotkov; Valerie Marchenko; Gregory S. Tucker; Peter A. R. Ade; Enzo Pascale; Derek Araujo; Daniel Chapman; Joy Didier; Seth Hillbrand; B. R. Johnson; M. Limon; Amber Miller; Britt Reichborn-Kjennerud; Stephen M. Feeney; A. H. Jaffe; Radek Stompor; M. Tristram; M. Dobbs

The E and B Experiment (EBEX) is a balloon-borne polarimeter designed to measure the polarization of the cosmic microwave background radiation and to characterize the polarization of galactic dust. EBEX was launched December 29, 2012 and circumnavigated Antarctica observing


Proceedings of SPIE | 2010

Software systems for operation, control, and monitoring of the EBEX instrument

Michael Milligan; Peter A. R. Ade; François Aubin; C. Baccigalupi; Chaoyun Bao; J. Borrill; C. M. Cantalupo; Daniel Chapman; Joy Didier; M. Dobbs; William F. Grainger; Shaul Hanany; Seth Hillbrand; J. Hubmayr; P. Hyland; A. H. Jaffe; B. R. Johnson; T. S. Kisner; Jeff Klein; Andrei Korotkov; Sam Leach; Adrian T. Lee; Lorne Levinson; M. Limon; Kevin MacDermid; Tomotake Matsumura; Amber Miller; Enzo Pascale; Daniel Polsgrove; N. Ponthieu

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arXiv: Instrumentation and Methods for Astrophysics | 2018

Design and characterization of a balloon-borne diffraction-limited submillimeter telescope platform for BLAST-TNG

Nathan P. Lourie; Nicholas Galitzki; F. E. Angilè; Peter Ashton; Mark J. Devlin; Simon R. Dicker; B. Dober; L. M. Fissel; Samuel Gordon; J. Klein; Ian Lowe; Philip Daniel Mauskopf; F. Nati; Giles Novak; J. D. Soler; Paul Williams; Brian E. Catanzaro; Joy Didier; Javier Romualdez

6,000 square degrees of sky during 11 days at three frequency bands centered around 150, 250 and 410 GHz. EBEX was the first experiment to operate a kilo-pixel array of transition-edge sensor bolometers and a continuously rotating achromatic half-wave plate aboard a balloon platform. It also pioneered the use of detector readout based on digital frequency domain multiplexing. We describe the temperature calibration of the experiment. The gain response of the experiment is calibrated using a two-step iterative process. We use signals measured on passes across the Galactic plane to convert from readout-system counts to power. The effective smoothing scale of the EBEX optics and the star camera-to-detector offset angles are determined through \c{hi}2 minimization using the compact HII region RCW 38. This two-step process is initially performed with parameters measured before the EBEX 2013 flight and then repeated until the calibration factor and parameters converge.


ieee aerospace conference | 2015

Star camera system and new software for autonomous and robust operation in long duration flights

Daniel Chapman; Asad M. Aboobaker; Derek Araujo; Joy Didier; Will Grainger; Shaul Hanany; Seth Hillbrand; M. Limon; Amber D. Miller; Britt Reichborn-Kjennerud; Ilan Sagiv; G. S. Tucker; Yury Vinokurov

We present the hardware and software systems implementing autonomous operation, distributed real-time monitoring, and control for the EBEX instrument. EBEX is a NASA-funded balloon-borne microwave polarimeter designed for a 14 day Antarctic flight that circumnavigates the pole. To meet its science goals the EBEX instrument autonomously executes several tasks in parallel: it collects attitude data and maintains pointing control in order to adhere to an observing schedule; tunes and operates up to 1920 TES bolometers and 120 SQUID amplifiers controlled by as many as 30 embedded computers; coordinates and dispatches jobs across an onboard computer network to manage this detector readout system; logs over 3 GiB/hour of science and housekeeping data to an onboard disk storage array; responds to a variety of commands and exogenous events; and downlinks multiple heterogeneous data streams representing a selected subset of the total logged data. Most of the systems implementing these functions have been tested during a recent engineering flight of the payload, and have proven to meet the target requirements. The EBEX ground segment couples uplink and downlink hardware to a client-server software stack, enabling real-time monitoring and command responsibility to be distributed across the public internet or other standard computer networks. Using the emerging dirfile standard as a uniform intermediate data format, a variety of front end programs provide access to different components and views of the downlinked data products. This distributed architecture was demonstrated operating across multiple widely dispersed sites prior to and during the EBEX engineering flight.

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Shaul Hanany

University of Minnesota

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Chaoyun Bao

University of Minnesota

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C. Baccigalupi

International School for Advanced Studies

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