TuMag for SUNRISE III mission: development of the optical unit of an imaging spectropolarimeter

Alvarez-Herrero, A.; Fernández-Medina, Ana; Cebollero, María; Garranzo, Daniel; Gonzalo, Alejandro; Sánchez, Antonio; Villanueva, J.; Parejo, Pilar García; Campos-Jara, Antonio; Silva-López, Manuel; Julián, Ricardo San; Laguna, H.

doi:10.1117/12.2629391

Cited by 5 publications

(8 citation statements)

References 15 publications

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“…The polarimetric calibration was carried out at 35ºC at the three wavelengths of the instrument (517.27, 525.02 and 525.06 nm) and the two cameras. An optimum modulation scheme that maximizes the polarimetric efficiencies was selected 1 and is shown in the following Table 4: The initial voltages applied to the LCVR cells corresponds to the retardances of the polarization modulation scheme obtained from the individual calibration of the LCVRs carried out in a Woollam Variable Angle Spectroscopic Ellipsometer (VASE) at the three instrument wavelengths. Nevertheless, deviations from an ideal system caused by manufacturing tolerances of the optical elements and the mechanical assembly, azimuthal angles among the polarizing elements (LCVRs, polarizer, etc) different from the designed, LCVR non-ideal effects and the instrumental residual polarization can cause polarization modulation different from the theoretical ideal system.…”

Section: Polarimetric E2e Test Resultsmentioning

confidence: 99%

“…In addition to these methods, the TuMag image optical quality was determined using the phase diversity technique 9 . TuMag includes a calibrated defocusing plate that can be inserted in the optical path in order to deduce the Point Spread Function (PSF) during the flight and it allows to carry out image restauration by deconvolution 1 . The results obtained from the phase diversity technique are in agreement with the results shown in Section 3.1, but they are out of the scope of this work.…”

Section: Ogse For the Image E2e Testmentioning

confidence: 99%

“…It should be highlighted that TuMag is the first solar magnetograph onboard an aerospace platform with the capability of tuning the solar line to be observed. Further technical details about TuMag can be found in [1]. *alvareza@inta.es; phone +34 91 520 1062; www.inta.es TuMag is a fully new instrument based on the heritage of the development carried out for the successful IMaX (The Imaging Magnetograph eXperiment) for the SUNRISE I and II missions [2][3][4] .…”

Section: Introductionmentioning

confidence: 99%

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End-to-end tests of the TuMag instrument for the SUNRISE III mission

Alvarez-Herrero¹,

Garranzo²,

Silva-López³

et al. 2022

Ground-Based and Airborne Instrumentation for Astronomy IX

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SUNRISE III mission is a one-meter aperture telescope onboard a balloon within NASA Long Duration Balloon Program. Three post-focus instruments are used for studying the Sun's dynamics and magnetism, among which the Tunable Magnetograph (TuMag) is a tunable imaging spectropolarimeter.TuMag is a diffraction-limited imager, a high sensitivity polarimeter (< 10 -3 ), and a high-resolution spectrometer ( ~ 65 mÅ). It will be able to study solar magnetic fields at high spatial resolution (~100 km on the solar surface). It will make images of the solar surface magnetic field after measuring the state of polarization of light within three selected spectral lines: the Fe I lines at 525.02 nm and 525.06 nm, and the Mg I b2 line at 517.27 nm. It will be sensitive to the solar vector magnetic fields and line-of-sight velocities, in the photospheric and chromospheric layers. TuMag will be the first solar magnetograph onboard an aerospace platform with the capability of tuning the solar line to be observed.In this paper the TuMag end-to-end tests carried out during the verification phase are described. These tests are performed to characterize and calibrate the instrument. Specifically, they determine the polarimetric and spectroscopic performances of the instrument as well as the image quality. The availability of a singular facility, an ISO6 clean room with a coelostat on the building roof, allowed the use of solar light during the verification campaign. This was key to a complete instrument verification due to the unique spectroscopic and polarimetric characteristics of solar light.

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Section: Polarimetric E2e Test Resultsmentioning

confidence: 99%

Section: Ogse For the Image E2e Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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End-to-end tests of the TuMag instrument for the SUNRISE III mission

Alvarez-Herrero¹,

Garranzo²,

Silva-López³

et al. 2022

Ground-Based and Airborne Instrumentation for Astronomy IX

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“…This polarization control will be done with the polarization modulators based on liquid crystals developed by INTA for the Solar Orbiter mission and currently in operation. 27,28 A reduced aperture version of the device will be implemented, consists in a device with three Liquid Crystal Variable Retarders (LCVRs) at different relative azimuths. (see Section 5).…”

Section: Qkd System Of Q-ansermentioning

confidence: 99%

Inflight demonstrator of quantum key distribution between CubeSats of Q-ANSER program

Jimenez-Girela,

Arteaga-Diaz,

Merino Pérez

et al. 2023

Photonics for Quantum 2023

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In Quantum Key Distribution (QKD), the emitter and receiver need to share an optical quantum channel - which can be optical fibre, terrestrial free-space or space-based links- to exchange the quantum states. However, with the future aim to achieve a quantum global communication network, communications links between small satellites in constellations will be required. In this context, the experience of INTA in the ANSER (Advanced Nanosatellite Systems for Earth Observation Research) small satellite constellation program will be exploited. This program develops a set of missions that will include groupings of a minimum of three CubeSats (a leader and two or more followers) flying in formation and in coordinated operation for a common mission. Therefore, the only difference between ANSER and Q-ANSER program will be the payload of the satellite. In Q-ANSER, in which a prepare-and-measure B92 QKD protocol will be used to generate the secret key, two optical systems will be introduced. In the emitter this system will be capable of sending polarized weak coherent laser pulses, attenuated to single-photon level, to the receiver, which will also be an optical system capable of receiving and detecting these single photons. Prepare-and-measure QKD schemes with polarization encoding require the minimization of polarization degradation both in the transmitter and receiver designs. In particular, the polarization extinction ratio (PER) should be maintained as high as possible to reduce the quantum bit error rate (QBER) . This polarization control will be done with the polarization modulators based on liquid crystals developed by INTA.

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“…spectropolarimeter, and one of the three focal plane instruments 4,5 developed for the third flight of SUNRISE. The SCIP runs multi-wavelength spectropolarimetric observations with a polarimetric precision of 0.03% (1σ) and a spatial resolution of 0.21 arcsec.…”

mentioning

confidence: 99%

High-speed data processing onboard sunrise chromospheric infrared spectropolarimeter for the SUNRISE III balloon telescope

Kubo,

Katsukawa,

Hernández Expósito

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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The Sunrise Chromospheric Infrared spectroPolarimeter (SCIP) has been developed for the third flight of the SUNRISE balloon-borne stratospheric solar observatory. The aim of the SCIP is to reveal the evolution of three-dimensional magnetic fields in the solar photosphere and chromosphere using spectropolarimetric measurements with a polarimetric precision of 0.03% (1σ). Multiple lines in the 770 and 850 nm wavelength bands are simultaneously observed with two 2 k × 2 k CMOS cameras at a frame rate of 31.25 Hz. Stokes profiles are calculated onboard by accumulating the images modulated by a polarization modulation unit, and then compression processes are applied to the two-dimensional maps of the Stokes profiles. This onboard data processing effectively reduces the data rate. SCIP electronics can handle large data formats at high speed. Before the implementation into the flight SCIP electronics, a performance verification of the onboard data processing was performed with synthetic SCIP data that were produced with a numerical simulation modeling the solar atmospheres. Finally, we verified that the high-speed onboard data processing was realized on ground with the flight hardware using images illuminated by natural sunlight or an LED light.

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TuMag for SUNRISE III mission: development of the optical unit of an imaging spectropolarimeter

Cited by 5 publications

References 15 publications

End-to-end tests of the TuMag instrument for the SUNRISE III mission

End-to-end tests of the TuMag instrument for the SUNRISE III mission

Inflight demonstrator of quantum key distribution between CubeSats of Q-ANSER program

High-speed data processing onboard sunrise chromospheric infrared spectropolarimeter for the SUNRISE III balloon telescope

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