LAGRANGE REMOTE SENSING INSTRUMENTS: THE EXTREME ULTRAVIOLET IMAGER (EUVI) C. Kintziger (CSL) - Presenter S. Habraken (CSL) P. Bouchez (CSL) Matthew West (ROB) David Berghmans (ROB) Manfred Gyo (PMOD/WRC) Margit Haberreiter (PMOD/WRC) Jackie Davies (RAL Space) Martin Caldwell (RAL Space) Ian Tosh (RAL Space) Stefan Kraft (ESA) 1 ESWW 2018, 9 Nov. 2018 LGRRS-EUVI | Mission overview 4 remote-sensing instruments See Poster 23 by J. Davies 2 ESWW 2018, 9 Nov. 2018 LGRRS-EUVI | Mission overview 5 in-situ instruments 3 ESWW 2018, 9 Nov. 2018 LGRRS-EUVI | Mission overview • Overall Remote Sensing Instruments leader: RAL Space (UK) • EUVI study led by three institutes: – CSL (BE) – ROB (BE) – PMOD/WRC (CH) • CSL activities • ROB activities • PMOD activities – EUVI Instrument manager: – instrument – electrical engineering • Overall management requirements – mechanisms • System study – instrument operation – mechanical engineering • Optical engineering – ground segments • Thermal engineering • AIT engineering • Roles & Responsibilities – BPI: Pr. Dr. Serge Habraken (CSL) – Bco-I: Dr. Matthew J West (ROB) – CSL work funded by Belspo via Prodex Programme 4 ESWW 2018, 9 Nov. 2018 LGRRS-EUVI | Mission overview • EUV Imager – SSA programme (SWE) – Location: L5 – Goal: image the full solar disc – Waveband: EUV wavelength (e.g. 193 Å) – Heritage: PROBA-2 SWAP ESIO (GSTP) Solar Orbiter EUI Parameter Requirement Spectral resolution < 1.5 푛푚 퐹푊퐻푀 Spatial resolution < 5 푎푟푐푠푒푐 Field of view 42.6′ 푥 42.6′ Mass < 8 푘푔 Size < 600 푥 150 푥 150 푚푚 Power < 10 푊 5 ESWW 2018, 9 Nov. 2018 LGRRS-EUVI | Instrument overview • Selected wavelengths 131 nm 19.5 nm 30.4 nm Semi-Static Structures Dynamic structures Regions Filaments/Prominences Flares Chromosphere Active Regions Eruptions Million Degree Corona Coronal Holes EUV Waves Dimmings 6 ESWW 2018, 9 Nov. 2018 LGRRS-EUVI | Instrument overview • Field of view – Differs between selected wavebands 1. 195 Å 43 arcmin Toward Earth 62 arcmin 2. 131 + 304 Å 43 arcmin 43 arcmin 7 ESWW 2018, 9 Nov. 2018 LGRRS-EUVI | Instrument overview • Detector: EUI spare 3k by 3k, separate windowing options 1. 195 Å: 2300x1600, 1,6”/pixel, 3.2” spat. res. over 2 pixels 2. 131 + 304 Å: 2x2 binning, 800x800, 3.2”/pixel, 6.4” spat. res. over 2 pixels • Cadence: Different for each spectral channel 1. 195 Å: 3 min 2. 131 Å: 2 min 3. 304 Å: 5 min • Schematic configuration: Channel 1 FEE DC/DC Entrance f ilter FPA camera Detector PE Power Optical sy stem Door Channel 2 Entrance f ilter Filter wheel FPA camera Detector PE Optical sy stem Door HK, data Mechanism EUVI Optical Unit control TC EUVI Electronic Box IPU 8 ESWW 2018, 9 Nov. 2018 LGRRS-EUVI | Instrument overview • Obtained design – ESIO-like truss structure • Separate avionic box • Lightweight and stiff – SWAP-based optical design • Improved spatial resolution and larger FOV wrt SWAP (and ESIO) • Similar baffling system – Filter wheel • Selects between 131 and 304 observation – One-shot opening doors 9 ESWW 2018, 9 Nov. 2018 LGRRS-EUVI | Performed analyses • Performed analyses – Understanding of requirements – Optical design • Tolerancing EUVI Electronics IPCU Optical Unit • Straylight Heater TL 2*(1) EUVI Survival Heater RadiatorLink Radiator Thermal Link Thermistor TL 2*(1) EUVI Thermistor RadiatorLink Camera 1 SpW 2*(1) EUVI-A CCSDS SpW 2*(1) Heater APS(A) 2*(1) EUVI Operational Heater APS (A) Thermistor APS(A) 2*(1) EUVI Thermistor APS (A) Camera 2 SpW 2*(1) EUVI-B CCSDS SpW 2*(1) Heater APS(B) 2*(1) EUVI Operational Heater APS (B) – Electrical design Thermistor APS(B) 2*(1) EUVI Thermistor APS (B) Power EB HK Control EB HK Control Filter Wheel Power Electronic Box – Instrument performance model Power 2*(1) EUVI SU 2*(1) Heater EB 2*(1) EUVI Survival Heater EB Thermistor EB 2*(1) EUVI Thermistor EB – Thermal analysis: • Undergoing at CSL – Structural analysis • Undergoing at PMOD/WRC 10 ESWW 2018, 9 Nov. 2018 LGRRS-EUVI | Performed analyses • Encountered issues: – Coating: dual-band coating for 131 + 304 Å is not “off-the-shelf” because those two wavelengths do not fall within two successive Bragg orders (need to be factor ~2 between wavelengths) • is feasible • requires simulation and development Other alternatives: • Superpose 2 mono-band coatings on top of each other • Implement a patterned coating on primary mirror will lead to ~50% loss in efficiency BUT mono-band coating may be as high as 2x more efficient than dual-band. 11 ESWW 2018, 9 Nov. 2018 LGRRS-EUVI | Way forward after PRR 12 ESWW 2018, 9 Nov. 2018 LGRRS-EUVI | Conclusion 13 ESWW 2018, 9 Nov. 2018 .