I H Park EVENT

Slide1: 

To be in preparation for Announcement of Opportunity from Korean 3rd Science Satellite Program Il H. Park (Ewha W. Univ., Seoul) Discussion at SINP, Moscow State University (Oct. 19, 2005) Seminar at JINR, Dubna (Oct. 21, 2005) EVENT (Earth Viewing Extreme Nature Telescope) Space telescope to observe extreme energy cosmic ray quanta & atmospheric phenomena

Korean Science Satellite Program: 

Korean Science Satellite Program 1st science payload (FIMS, UV astronomy), satellite launched in Russia in 2003 Scientific results not great because of problem in poor positioning accuracy 2nd science payload AO made, and payload of radiometer selected in 2004 Requirements: 50kg, 270x200x330 mm3, 20W, 200 kbps, 300~1500km orbit, 80 degree inclined will be launched in 2006 or 2007 by using Korean launching facility (~100kg)

STSAT-2 Payload: 

STSAT-2 Payload DAQ, control, housekeeping box PC-104 4 analog board box ADC/control/power 4 PMT (256 ch) Carbon plastic Spherical mirror

CREAM Balloon Mission (2004): 

CREAM Balloon Mission (2004)

Korean Science Satellite Program: 

Korean Science Satellite Program 3rd science payload AO will be announced at the end of 2005 Final selection will be made no later than summer 2006, and project immediately starts (no phase A, B, …, once selected, the project are guaranteed Launch foreseen 2008~2009, preferably using Russian launching facility Overall cost including launch should not exceed $20M Favor will be given to proposal which can give some scientific impact(?) and technological feedback and improvement in the area of payload, platform and space parts A few proposals, UHECR, infrared telescope, earth shinning, …, are likely to be in competition I propose a collaboration for UHECR, named EVENT, same members as TUS EVENT before TUS, EVENT after TUS, or same time TUS EVENT Provide a sort of pilot experiment for future mission like EUSO, KLYPVE 4th AO will be announced and selected around 2007 Plan to propose “tracking mirror telescope for observation of UHECR”

Slide6: 

New Idea of the Next Generation Telescope with a “Tracking Mirror” (EWHA University, Seoul) “New MEMS technology of the controlled micro mirror arrays allows to design a mirror, arranging its focus in direction of the EAS particle disc. Preliminary direction to the EAS disc is determined by the photo receiver rough pixels. The computer rearranges the micro mirror array and focuses the disc image to the fine pixel receiver part. The tilting velocity of micro mirrors has to be high (about 1o per microsecond).” I.H.Park, et al. ICRC 2003 I.H.Park, SpacePart 2003 I.H.Park, et al. COSPAR 2004 CERN Courier

DMD mMirror : Electrostatic Actuation: 

DMD mMirror : Electrostatic Actuation Texas Instrument Digital -> Two preset directions only

TMA mMirror : PZT(Piezoelectric) Actuation: 

TMA mMirror : PZT(Piezoelectric) Actuation Daewoo Electronics Analog -> Variable direction

Third Order Optics: 

Third Order Optics The paraxial approximation, sin q ~ q, is somewhat unsatisfactory if rays from the periphery of a lens are considered

How to remove Aberrations: 

How to remove Aberrations Archimedes’ Mirror : mirror, control by solders Focusing of sun at any incident angles Tracking of object(sun) at any angles allows an aberration free optics Tracking Mirror : micromirror, control by VLSI electronics (I.H.Park, 2003) “Zoom” -> “Adjustable Field Resolution” -> Wide FOV “Tracking” -> Aberrations Free Image and Only Small No. of Detector Channels

Tracking : aberration free imaging: 

-0.5m 0 0.5m -200km 0 80 200km Detector Air mmirror Tracking : aberration free imaging 1D-simulation

MEMS Mirror (ZEMAX Simulation): 

MEMS Mirror (ZEMAX Simulation) Required angle for each cell MEMS micromirror array Photo detector array

MEMS 9 by 9 cells ZEMAX Simulation (김정영): 

MEMS 9 by 9 cells ZEMAX Simulation (김정영) # layout rays 20000

MEMS Tracking Mirror (ZEMAX Simulation): 

MEMS Tracking Mirror (ZEMAX Simulation) Only ~ 5 % of diffraction & scattering effects

Design Parameters of MEMS Tracking Mirror: 

Design Parameters of MEMS Tracking Mirror

Advantage of MEMS Telescope: 

Advantage of MEMS Telescope Proposed idea provides Zoom-in feature -> large FOV Tracking feature -> Aberration free system, large mirror size, only small no. of photo detector channels required -> significant reduction of cost, power, weight Silicon allows Light weight, thin, large mirror Experience of ~1m2 silicon detector shows Low power consumption : < 1 mW per 200mm cell, so ~25 W/m2 Light Weight : 10 kg/m2 including electronics Low Production Cost : $30/cm2, so $300,000/m2 Multi-band measurements with 2nd, 3rd, … photo detector In situ calibration: improve focusing accuracy Sun shield: protect photo detectors Power generation: direct lights to solar cells

TUS Satellite Platform: 

TUS Satellite Platform Earth EECR (1020 eV) fluorescence Cerenkov Russian Satellite in 2008 Fresnel Mirror + PMT Stereo Eyes Aperture double Tau-nu measurement

Requirements of mmirror for MOS of SPICA: 

Requirements of mmirror for MOS of SPICA Tilting Speed : 1 degree/msec possible at present technology Large Tilting Angle : Close to 10 degrees Linearity (Tilting Angle .v. Applied Voltage) : Good linearity shown Angle accuracy : 0.1o of resolution at present Angle fixing stability High Fill Factor > 90% Mirror cell size : 100 um Acceptable wavelength : 0.5-1-10 um Operating temperature : 20-60K Low power consumption : < 1 mW per 200mm cell, so ~25 W/m2 Light Weight : 10 kg/m2 including electronics Low Production Cost : $30/cm2, so $300,000/m2 MOS: Multi-Object Spectrometer, SPICA: future Japanese IR mission

Micromirror & Microshutter for MOS of NGST: 

Micromirror & Microshutter for MOS of NGST Sandia Micromirror GSFC Microshuttors

Vertical Comb-drive Actuator in 2005 R&D in Korea: 

Vertical Comb-drive Actuator in 2005 R&D in Korea 1 axis, electrostatic comb drive actuator, designed, fabricated, test in preparation May be used for 3rd Satellite mission, EVENT, 2008 2 axes, electrostatic comb drive actuator is being designed, simulated, will be fabed in 2006 Aimed for 4th Korean Satellite, EVENT-II, 2012

Remarks and Plan for MOS for SPICA: 

Remarks and Plan for MOS for SPICA Remarks Needs comprehensive study to find the best solution for MOS Comparisons between DMD, shutter, “our own design” Our design is under way with a help of KIST Multi-spectrum measurements with micromirror being tried Plan Study of micromirror and microshutter (-2005.8) Design of our micromirror prototype (-2005.5) How to actuate ? - Actuation material study Completion of the process flowchart (-2005.6) Fabrication of 1-axis micromirror prototype (-2005.10) Fab at KIST, ETRI, or/and SNU-ISRC Test bench setup (optics, table, etc.) and Test of the prototype Feedback to the next prototype design (-2006.1)

Comb-drive 2d Micromirrors (in Korea): 

Comb-drive 2d Micromirrors (in Korea) 1 axis, electrostatic comb drive actuator, designed, fabricated, test in preparation May be used for 3rd Satellite mission, EVENT, 2008 2 axes, electrostatic comb drive actuator is being designed, simulated, will be fabed in 2006 Aimed for 4th Korean Satellite, EVENT-II, 2012

Proposal to 3rd Korean Science PayloadEVENT: 

Proposal to 3rd Korean Science Payload EVENT Science 1st goal: UHECR, dust grain, meteor 2nd goal: Atmospheric science: ionosphere related, solar activity related science (solar max in 2008), Blue Jets, Aurora, Thunderstorm discharge, earthquake related, … Technology Public attention like “ARTIFICIAL MOON” Turning mirror Folding segments Digital MEMS application in space Try of multi-detector (multi-frequency) system: UV & IR measurement in one platform Try of ground supervision like mountain fire, large scale explosion, etc.

Meteor: 

Meteor Brightness, direction, occurance -> source of meteor 1~10 events/revolution Kinetic energy ~ 100 J (size ~ 0.5 mm) Horizontal meteors (zenith angle > 60 degree) recorded in several pixels

Aurora belts (Northern and Southern): 

Aurora belts (Northern and Southern) Artistic view of the Aurora belts in UV as they were measured by the NASA are the main features of the average UV flux measurements

Fire: 

Fire

Night View of the Earth :: 

Night View of the Earth : We will measure the real background

Debris: 

Debris

Proposal to 3rd Korean Science PayloadEVENT: 

Proposal to 3rd Korean Science Payload EVENT Payload Weight: ~100 kg 3m diameter mirror built from mirror segments of two or three ring structure, unfolded in space, Fresnel or spherical mirror FOV: 15 degree ? Aperture: ? No of channel: ~2000 PMT channel foreseen Other small detectors for atmospheric science or solar physics can be added if possible Preliminary conceptual, but as detailed as we can, design should be made soon Thinking a bit ambitiously May try “multi-detector” system Lights delivered to UV photo detector and IR detector (or to solar cells) by using digital MEMS micromirror Optics is then off-axis, bit complicated, but certainly possible May try to rotation of mirror to look up and down using an engine built in

Mirror segment and Photodetector: 

Mirror segment and Photodetector Hamamatsu R5900 M64 8x8 channels Size: 26x26 mm2 Bialkali PC: Q.E. ~ 22% at lmax = 400 nm. Gain  106 Quartz lenses to increase active area Single photon sensitivity Precision < 1mm 3 ns falling time (300 MHz readout) Active area fraction 38%. Increased by lenses (78%) Carbon plastic spherical mirror Fresnel mirror or Carbon plastic spherical mirror MultiAnode PMT

Electronics/DAQ Architecture: 

DC/DC converter Power simulator Power Supply ASTRON VLB-10M P.S Calibration ACP Board Ladder House Keeping board S/P Board PC PC Power line P.G. BNC BNC 14 pin female 14 pin female 15 pin D-sub female 9 pin D-sub male 9 pin D-sub female 10 pin female 100 pin connector House keeping S/D data cable 15 pin male D-sub 9 pin male D-sub 9 pin female D-sub Serial cable 9 pin female D-sub Serial 14 pin female Lemo cable 9 pin D-sub male Power 9 pin female D-sub 37 pin male 14 pin female 30 pin cable 16 female Header type Control cable charge Flat cable Twist & Flat Cable ISA Electronics/DAQ Architecture

Proposal to 3rd Korean Science PayloadEVENT: 

Proposal to 3rd Korean Science Payload EVENT Launch Using same as MSU-Tatiana, using Military satellite Energia and Samara using PROGRESS Submarine launching Ground control 3 years of mission ?

Proposal: 

Proposal Payload name Mission minimal: Maximal: If we are lucky: Results and spinoff Risks Platform Launch Organization and Collaboration (?) Korea: [Ewha, KAIST, Yonsei, KAO], [KARI, Satrek] Russia: [MSU, DUBNA, …], [Energia, …], […] MOU or agreement letters, etc To be clearly stated with concrete plan

Discussion in this “CR in Space” community: 

Discussion in this “CR in Space” community EVENT can be considered as a “pilot experiment” for future EUSO or KLYPVE You can try to test any what we have on mind with EVENT Our CR community is quite small, so I need your support and collaboration to win the AO this year