PowerPoint Presentation

EUV spectroscopic observation of Jupiters inner magnetosphere

20091125STP/ContentsGeneral introductionJupiter and Io plasma torus (Target)Spectral diagnosis using EUV emissions (Approach)

Analysis of the data obtained by CASSINI/UVIS during its Jupiter flybyThe principle and method of the spectral diagnosisThe evaluation of the plasma parameters around the Io torusHot electron ratioAnother parameters

Development of the EUV spectroscope on board the earth-orbiting satelliteInstrumental overviewEntrance mirrorGratingDetectorMicrochannel plate with photocathodeResistive anode encoderThe shield structure and noise evaluationThe feasibility study of the observation for the Io torus

Summary

Future works271500 km6400 km9h55min24 h*420,000 nT31,000 nT5.1 AU**1 AU* ** 1 AU = 1.5E+8 km ~ 2000 RJ 5 ~ 8RJ

NASA/NEW HORIZONS

NASA/CASSINI333

57 km/s

~ 100 eV5 eV

EUV10%Pick up energyEUV radiation~ 2 TWIonsS+, S++, S3+, S4+, O+, O++

Core electrons: ~5 eV, ~2000 ele./cc

Fast neutralTransport444

3S+, S++, S3+590%EUVIonsS+, S++, S3+, S4+, O+, O++

Core electrons: ~5 eV, ~2000 ele./cc

Galileo>1 keVFrank and Paterson, 2000()Pick up Pick up energyEUV radiation~ 2 TWHot electronsEUVFast neutralTransport

661

24680, 701, 822, 1077

7--EIS~0.06A FWHMXIIIS/N

Watanabe et al. 2009

203.8 A202.0 A [cm-3][cm-3]89

Nj NJ

Thermally averaged cross sectionA-valueNJCHIANTISII, SIII, SIV, SV, OII, OIII

11

CASSINI/UVISCASSINI1997NASAUVISCASSINIEUV (560 ~ 1180)20 mm 20 mm

200010

100030S/N5.5~6.5RJ

Esposito et al. 199912

SV/SIII=0.00, OIII/SIII=0.21 keV2OII/SIIISVEUV1OIII:Voyager-1OIIIOII2OIIOIII1SII/SIII131SIV/SIII

13

S/NVS

10DUSKDAWN15

15

Voyager -1Sitteler and Strobel, 1987

Voyager-1Baganel 1994Distance from Jupiter center (RJ)

163216C2 = 15 vs 18

vs

vs OII/SIII

219 vs vs SII/SIII vs SIV/SIII vs SII/SIII vs OII/SIII vs SIV/SIII

320OII/OIII vs SII/SIII vs SII/SIII vs SIV/SIII vs OII/SIII

OII/OIII vs SIV/SIIISII/OIII vs SIV/SIII

2100 ~ 2700 [cm-3]

3.55 ~ 4.55 [eV]

2.7 ~ 4.3 [%]

OII / SIII: 0.96 ~ 1.40

SII/SIII: 0.31 ~ 0.42

SIV/SIII: 0.14 ~ 0.19

21160 eV1keV

EUV60

EUV

23ContentsGeneral introductionJupiter and Io plasma torus (Target)Spectral diagnosis using EUV emissions (Approach)

Analysis of the data obtained by CASSINI/UVIS during its Jupiter flybyThe principle and method of the spectral diagnosisThe evaluation of the plasma parameters around the Io torusHot electron ratioAnother parameters

Development of the EUV spectroscope on board the earth-orbiting satelliteInstrumental overviewEntrance mirrorGratingDetectorMicrochannel plate with photocathodeResistive anode encoderThe shield structure and noise evaluationThe feasibility study of the observation for the Io torus

Summary

Future works24201211

MCP> 1 %RAE0.3 nm FWHMRAE10 30 < 1 cps/cm2

252526

F0.5mm

1RJ~10200mm, 5F27

Pt, Si, SiC

Pt, Si, SiC28SiCSiPt28

2929

3030Pt02% @30.4 nm22% @58.4 nm15% @83.4 nmSi---% @30.4 nm02% @58.4 nm15% @83.4 nmSiC00% @30.4 nm13% @58.4 nm30% @83.4 nmSiC30%

31CVD-SiCChemical Vapor Deposition (SiO2, H2, CH4SiCSiC

0.5 nmCVD-SiC

32

0.532CVD-SiC30 ~ 50%0.4 nmSample No. 10.34 nmNo. 30.36 nmNo. 1A0.42 nmNo. 2A0.32 nmNo. 5A0.39 nmNo. 6A0.30 nmNo. 7A0.22 nm

3333 1-CVD-SiC1800 Lines/mm22 nm

-Detector: MCPBias angle : 20 degreePhotocathode: CsI

2 mm Aluminum and 8 mm SUS304 shield1000 ~ 1200 km34

34CVD-SiC

0.5mm10, 2FWHMCVD-SiC

68,15, 20, 22, 26, 39 nmCVD-SiC

22nm

0.1nm

2nm39 1-CVD-SiC1800 Lines/mm22 nm

-Detector: MCPBias angle : 20 degreePhotocathode: CsI

2 mm Aluminum and 8 mm SUS304 shield1000 ~ 1200 kmMCP (Micro channel plate)MCP10um2

404040

201.510241414142

30-84 nm105-135 nmCsI / Bare1.5 - 25 - 100KBr/ Bare0.6 - 25 -80MCPRAEEUV2EUVMCP107RAE

SELENE/UPI/TEX3MCP ~0.1 pC7 bits128128 pixels

RAE : 1~100 k Ohm

43MCP + RAE (PHEBUS/BBM)MCP + RAE43MCPRAEEUV~10bits~RAE (Resistive Anode Encoder)+RuO2121

Q VADCADCAnalog to digital converter 14 bitsFPGA1-D RAE (~1 pC, 107 ele.)L1L2Q1Q2Q = Q1 + Q2

(x,y)

44LL44

2RAE MCP~~454546RAE10 bits (1024 * 1024 pixels)SELENE/UPI/TEX7 bits

(Point)RAEMCP, 10 pF1110 bits

RAE1

464647RAE 11mm (minimum)

RuO2RAE500 k100 k 50 k 10 k 5 k 1 k 10 pF18.13.611.790.420.180.043 pF6.931.380.700.100.070.02

[s]10pFAmptek/A2252.4 us10 k Ohm

474748RAE 2 -100 OhmRAEA225F

RAE10 k Ohm0.5 us200 300 OhmRAE1mm, 50 k Ohm484880um1A,10

20.08 mm0.3 1-CVD-SiC1800 Lines/mm22 nm

-Detector: MCPBias angle : 20 degreePhotocathode: CsI

2 mm Aluminum and 8 mm SUS304 shield1000 ~ 1200 km50

1 MeVAE8MAX model

1 MeV 1-CVD-SiC1800 Lines/mm22 nm

-Detector: MCPBias angle : 20 degreePhotocathode: CsI

2 mm Aluminum and 8 mm SUS304 shield1000 ~ 1200 km51

CASSINI/UVIS5003

CASSINI/UVISCASSINI/UVIS/EUV52CASSINI/UVISThe feasibility study of our future observation from the Earth-orbiting satellite130

53Ly-CASSINI/UVISThe feasibility study of our future observation from the Earth-orbiting satellite: 1 [eV] 1 % 500 [cm-3]54 VS VS VS

54Summary

CASSINI/UVIS1keV

3

155