pwi: plasma wave instrument. past major events: october 13: pwi 6th kyoto meeting （ kyoto univ.)...

MEFISTO-E

EFD

OFA/WFC

SORBET

AM2P-E

WPT-E

AM2P-S

MDP(CPU/RAM)

PWI-E

LF-SC

DB-SC

DB-SC

MEFISTO-S

WPT-S

SC-Pre

SC-Pre

WPT-PreWPT Drive

MEFISTO Drive

ＦＰＧ

Ａ

x 2 (for E, and B)

PWI Block Diagram

MEFISTO-E

EFD

OFA/WFC

SORBET

AM2P-E

WPT-E

AM2P-S

MDP(CPU/RAM)

PWI-E

LF-SC

DB-SC

DB-SC

MEFISTO-S

WPT-S

SC-Pre

SC-Pre

WPT-PreWPT Drive

MEFISTO Drive

ＦＰＧ

Ａ

x 2 (for E, and B)

PWI Block Diagram

PWI: Plasma Wave Instrument

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 GSEDecember 6: EMC tests of TWTA (Kanazawa)

Update of the PWI status (after the previous SWG)

EWO

•BBM Development & Tests: DC CAL/BIAS 、 Loop gain controlLPF of WFC/OFA/EFD-E & B

AM2P

•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)

Whole SCMSCM has been fully tested at Kanzawa University,

LF-x (JAPAN)LF-y (JAPAN)LF-z (FRANCE)HF-z (FRANCE)

Gain

Phase

Frequency [Hz]1 1M

Gain

Phase

Frequency [Hz]1 1M

SC-LF/SC-DB

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

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

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

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

Funding status

• Swedish National Space Board

• Royal Institute of Technology

• Swedish Institute of Space Physics

have signed funding commitments

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

SORBET instrument bloc diagram

S ea rch C o il D B

to /fr o m

D P U

+ E x

-E x

+ E y

F P G A

A G C

A G C

P A

P A

P A

1 0 k-4 0k

2 .5 k-1 0 k

1 6 0 k-64 0 k

4 0 k-1 60 k

1 0 k-4 0k

2 .5 k-1 0 k

1 6 0 k-64 0 k

4 0 k-1 60 k

R O M

-E yP A

S O R B E TIn stru m en t

+

-

+

-

C a l

C a l

C a l

Bz

T N R (T h erm a l N o ise R ece iver )

IF F ilter2 1 .4 2 5 M

L O2 1 .2 8 5 M

S y n th2 1 .9 2 5 M3 1 .6 2 5 M

H F R (H ig h F req u en cy R ece iver )D ig ita l

u n it

+

-

A D C

V ref

V ref

+

-

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

2.6mm

ELISA_0110/14 2.5V

Vref (3.5V)

AOP

In+ In-

IBIAS

Out

Clock driver

Clk_In

p_Clk

n_Clk

Mixer_1

Mixer_2

1

245 10

8

7

6

11121314 17 18

1921 25

2930

31

33

34

36 37 38 39 4042

IBIAS

RF-

RF+

OL+OL-

IF+

IF-

IBIAS

IF+

RF-

RF+

LO+LO-

IF-

AGC_1 Out

In

V CM

V AGC

IBIAS+

IBIAS -

V REF

R FBK

AGC_2Out

In

V CMV AGC

R FBK

IBIAS+

IBIAS -

V REF

4445

46

47

Band-Pass

SC-Filter

IBIAS

In Com

Out

p_Phi

n_Phi

Amp+

-

Amp-

+

M ix_Bias

IF_O

ut1

LO

1+

LO

1 -

RF1+

RF1 -

AG

C_O

ut1

Rfb

k1

Vc1

Vcm

1

AG

C_I

n1

Fil

t_O

ut

Fil

t_B

ias

AO

P_I

n+

AO

P_I

n -

AOP_Out

Fil

t_C

lk

Fil

t_C

om

Fil

t_In

AG

C_B

ias

-

Vcm

2

AG

C_I

n2

Vc2

Rfb

k2

AG

C_B

ias+

RF2+

RF2 -

LO

2+

LO

2 -

AG

C_O

ut2

IF_O

ut2

Major Events in the future

March, 2006:PWI local meeting in Kanazawa

March 2006:EMC tests of the MSASI motor

● 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

● 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