Telescope of extreme ultraviolet (TEX) onboard SELENE: science from the Moon

Yoshikawa, Ichiro; Yamazaki, Atsushi; Murakami, Go; Yoshioka, Kazuo; Kameda, Shingo; Ezawa, F.; Toyota, Takenobu; Miyake, W.; Taguchi, Makoto; Kikuchi, Masayuki; Nakamura, Masato

doi:10.1186/bf03352805

Cited by 46 publications

(30 citation statements)

References 66 publications

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“…The Upperatmosphere and Plasma Imager (UPI) consisted of two telescopes: an extreme ultraviolet telescope (TEX) to observe the plasmasphere around the Earth, and a visible telescope (TVIS) to observe global distribution of aurora and airglow of the Earth (Yoshikawa et al 2008). UPI used two motors to rotate these telescopes around the azimuth and elevation axes, by which they could stay pointed to the Earth.…”

Section: Design Emc Tests and Re-designmentioning

confidence: 99%

Magnetic Cleanliness Program Under Control of Electromagnetic Compatibility for the SELENE (Kaguya) Spacecraft

et al. 2010

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To achieve the scientific objectives related to the lunar magnetic field measurements in a polar orbit at an altitude of 100 km, strict electromagnetic compatibility (EMC) requirements were applied to all components and subsystems of the SELENE (Kaguya) spacecraft. The magnetic cleanliness program was defined as one of the EMC control procedures, and magnetic tests were carried out for most of the engineering and flight models. The EMC performance of all components was systematically controlled and examined through a series of EMC tests. As a result, the Kaguya spacecraft was made to be very clean, magnetically. Hence reliable scientific data related to the magnetic field around the Moon were obtained by the LMAG (Lunar MAGnetometer) and the PACE (Plasma energy Angle and Composition Experiment) onboard the Kaguya spacecraft. These data have been available for lunar science use since November 2009.

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Section: Design Emc Tests and Re-designmentioning

confidence: 99%

Magnetic Cleanliness Program Under Control of Electromagnetic Compatibility for the SELENE (Kaguya) Spacecraft

et al. 2010

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“…7) reported that their sample detector consisting of two MCPs in a V-stack configuration and an RAE achieved the resolution of 100×100 pixels. Recently, the detector using a Z-stack MCP and an RAE was mounted in the Telescope of Extreme Ultraviolet (TEX) onboard the SELENE satellite 8) . The detector had an active area of 32×32 mm and it achieved the 250-μm resolution, corresponding to the format of 128×128 pixels.…”

Section: Introductionmentioning

confidence: 99%

Development of the High-resolution FUV Detector for the BepiColombo Mission

Murakami

Yoshioka

Yoshikawa

2009

Trans. JSASS Space Tech. Japan

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The PHEBUS (Probing of Hermean Exosphere By Ultraviolet Spectroscopy) instrument on Mercury Planetary Orbiter in the BepiColombo mission is a dual FUV-EUV spectrometer (EUV: 55-155 nm, FUV: 145-315 nm). We are now developing the compact detector system sensitive to FUV airglow emissions of the Mercury. The FUV detector is required to have high spatial resolution (512×512 pixels) so that the wavelength resolution of the PHEBUS instrument should be 2 nm at the FUV range. The FUV detector consists of a Cs2Te photocathode, microchannel plates (MCPs), and a resistive anode encoder. In a position-sensitive system with a resistive anode encoder, the spatial resolution is determined by the signal-to-noise ratios at the anode terminals. Therefore, a high and stable electron gain of MCPs allows the position determination of each photoelectron event with high spatial resolution. We studied a method for achieving a high and stable electron gain. We fabricated a test model of the FUV detector incorporating a clamped pair of MCPs (V-stack) followed by a gap and a clamped triplet of MCPs (Z-stack) in cascade. We investigated the effect of the negative inter-stack potential on the PHD and the spatial resolution by means of calculation and experiments. As a result, the negative inter-stack potential made the electron gain more stable and the spatial resolution higher by ~14%. In this paper we report the specific performance of the test model of the FUV detector.

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“…The Kaguya's Mission Profile 2008;Yoshikawa et al 2008). In addition, a high-definition television (HDTV) was used for public outreach(Yamazaki et al 2010).…”

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confidence: 98%