1. PWI: Plasma Wave Instrument

2. Past major events: October 13: PWI 6th Kyoto meeting （ Kyoto Univ.) Discussion of the electrical interface and EMC October 18: EMC board meeting (ISAS) November 21: EGSE Meeting （ Meudon ） PWI Common GSE December 6: EMC tests of TWTA (Kanazawa) Update of the PWI status (after the previous SWG)

3. EWO BBM Development & Tests: DC CAL/BIAS 、 Loop gain control LPF of WFC/OFA/EFD-E & B AM 2 P Power supply : Voltage conversion- Usage of -12V ->-5V -> increase of power consumption Under the discussion of the size and weight considering the additional functions (To be discussed this week in Kanazawa)

4. SC-LF/SC-DB

5. TiAlN probe 40 mm diameter MEFISTO update 22 March 2006 Sensor wire, 0.1-0.3 mm “puck”Boom, connected to s/c ground Max. amplitude (LF) 500 mV/m Bit resolution 0.015 mV/m Spacecraft potential -100 to +100 V Frequency range DC – 3 MHz 1-2 m 13-14 m

6. Second-Surface Mirror Development Work is on-going to develop an SSM, mainly for the boom wire. Goal is to achieve: Mechanical flexibility Electrical conductivity, to keep all satellite surface potentials within ~1V Temperature below 150°C to avoid damage to wire insulator material

7. Thermal Modelling Thermal model of MEFISTO “ stand-alone ” has been developed and run All temperatures within acceptable limits for all mission phases Model has been supplied to JAXA, for integration with spacecraft level model Currently model details are being discussed and iterated with JAXA thermal engineers

8. Electronics Design and development of flight electronics is proceeding as planned Co-ordinated EGSE development in Europe is progressing Mechanics Design and development of flight machannics is proceeding as planned

9. Funding status Swedish National Space Board Royal Institute of Technology Swedish Institute of Space Physics have signed funding commitments

10. Requests (reminder) Normal sun angle > 92 deg, i.e., 93 +/- 1 deg, if possible Maximum potential difference on external surfaces of order 1 V, i.e., all external surfaces must be (reasonably) conductive

11. SORBET instrument bloc diagram

12. New ASIC design (January 2006) Analogue functions on a single chip : – Specific design (Full Custom) – Thin CMOS technology (AMS 0.35um) – 2 logarithmic amplifiers (AGC) – 2 low noise mixers – 1 selective band-pass filter – 1 low noise operational amplifier Functional testing showed : – Good performances – Improvement of the dynamic range – Less power needed Future actions – Thermal testing (soon) – Radiation evaluation (2Q/2006) – Decision to continue the ASIC solution (3Q/2006) 2.6mm

13. Major Events in the future March, 2006: PWI local meeting in Kanazawa March 2006: EMC tests of the MSASI motor

14. ● エレキ EWO-EFD: 回路設計 DC CAL/BIAS 、 Loop gain control EWO-WFC/OFA: 回路設計 センサとのインタフェース、 AC CAL レベルダイアグラム SORBET: EWO とのインタフェース AM2P: LVDS: +20g 、電力 3 倍？ MEFISTO レングスモニタ検討中 CMD&STATUS CAL 信号 → EWO へ 観測シーケンス検討 BBM 製作・特性試験（富山県大） （ BIAS/CAL 、 LGC 、 FPGA ） フィルタ BBM 製作（ MHI ） 特性試験（京大） PWI 前回設計会議からの進捗状況今後の予定

15. ● その他 Software / operation: データ取得シーケンス検討（金沢大） 各センサ／受信機 ⇔ MDP EMC: MMO EMC Meeting （ 10/18:ISAS ） → EMC ver.1.11 TWTA EMC 試験（ 12/6 ：金沢大） RE-02 / RE-04 （電界 / 磁界） CDC （電流） MDP-2 内接地方式： 1 点接地を基本 アナログ観測信号は差動受渡 cf. multiple ground: for clean E single ground: for clean B 基本案確定（ 3 月： PWI+MDP ） MSASI モータ EMC 試験（ 3 月：金沢大） 具体的議論（ 3 月） PWI 前回設計会議からの進捗状況今後の予定