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CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE Laboratoire de Physique et Chimie de l'Environnement 3A, avenue de la Recherche Scientifique F-45071 Orléans cedex 02, France. A ctive M easurement of M ercury’s P lasma, AM 2 P.

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slide1

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE

Laboratoire de Physique et Chimie de l'Environnement

3A, avenue de la Recherche Scientifique

F-45071 Orléans cedex 02, France

Active Measurement of Mercury’s Plasma, AM2P

Phone: (33 2) 38 25 52 63; Fax: (33 2) 38 63 12 34; E-mail: Jean-Gabriel.Trotignon@cnrs-orleans.fr

PWI MeetingKanazawa 25/03/2006

slide2

To Work, the AM²P Experiment Needs:

  • Sensors

- MEFISTO E-field antenna → I/F

- Current probes

  • Analogue / sampling devices for acquisition

- EWO electronics → I/F

  • Data processing / telecommands

- MDP/DPU2 → I/F

  • Synthesizer

- AM²P electronic board

PWI MeetingKanazawa 25/03/2006

slide4

AM²P synthesizer (1)

  • Four different tasks :

1 – AM²P for impedance measurement → HF range

2 – MEFISTO for calibration and antenna lengths → LF and HF ranges

3 – WPT calibration → to be discussed

4 – SCDB calibration → LF range.

PWI MeetingKanazawa 25/03/2006

slide5

AM²P synthesizer (2)

  • The synthesizer is synchronized by the 360 kHz EWO clock.
  • Two frequency ranges are delivered with a 512 ratio between them.
  • The HF range is used by AM²P to measure the MEFISTO HF impedance,
  • and for MEFISTO, and WPT (TBC) calibrations.

HF rangeFrequency bandΔf

Band 1 (30 frequencies) 0.703 - 21.09 kHz 703 Hz

Band 2 (30 frequencies) 22.50 - 63.27 kHz 1.406 kHz

Band 3 (30 frequencies) 66.08 - 147.63 kHz 2.812 kHz

  • The LF range is used for MEFISTO, SCDB and WPT (TBC)calibrations.

LF range Frequency bandΔf

Band 1 (30 frequencies) 1.37 - 41.19 Hz 1.37 Hz

Band 2 (30 frequencies) 43.94 - 123.6 Hz 2.75 Hz

Band 3 (30 frequencies) 129.07 - 288.34 Hz 5.49 Hz

PWI MeetingKanazawa 25/03/2006

slide6

Current Probe

PWI MeetingKanazawa 25/03/2006

slide7

Interfaces (1)

  • Three main interfaces :
  • 1 – With MEFISTO
  • Connector MDM 25 pins (TBC).

2 – With EWO

  • Connector MDM 25 pins (TBC).

3 – With MDP/PSU2

  • Connector MDM 9 pins.

PWI MeetingKanazawa 25/03/2006

slide8

Interfaces (2)

PWI MeetingKanazawa 25/03/2006

slide9

Interfaces (3)

  • Analogue interfaces with EWO
  • connector MDM 25 pins.
  • 2 current probes measurements sent on 2 differential lines (TBC),

- either CP1 on channel 1 and/or CP2 on channel 2,

- either CP1 on channel 2 and/or CP2 on channel 1,

- either CP1 and CP2 on the 2 differential inputs of channel 1 or channel 2 (complex mutual mode).

  • 2 output channels from the AM²P synthesizer sent on 2 differential lines (TBC),

- 2 channels are used simultaneously for WPT calibration :

- first channel with phase 0,

- second channel with phase 90,

- the first channel is also used for SCDB calibration,

- these 2 channels are sent to EWO which is in charge to deliver them to the right instruments.

PWI MeetingKanazawa 25/03/2006

slide10

Interfaces (4)

  • Digital interfaces with EWO
  • 7 digital signals are exchanged on 7 differential LVDS lines.
  • From EWO to AM²P :

- 360 kHz clock to synchronize transmission with acquisition,

- transmission trigger to start a new sequence,

- serial 16 bits TC word,

- TC synchro which synchronizes the TC word sending,

  • From AM²P to EWO :

- TC acknow to acknowledge the correct reception of the TC word,

- acquisition trigger to start the storage of the first measurement point,

- transmission status which signals the periods where AM²P is transmitting.

PWI MeetingKanazawa 25/03/2006

slide11

S/H1

MEM1

CP

Switches

MUX

ADC

Acquisition

MEFISTO

MEM2

S/H2

360

720

kHz

kHz

Acquisition sync

Transmission sync

AM²P

Transmission

PWI I/F MeetingKanazawa 25/03/2006

slide12

Interfaces (5)

  • 4) With PSU2
  • Connector MDM 9 pins.
  • Pin allocation (TBC) :

- 1 chassis

- 2 – 3 +3.3 V

- 4 – 5 +5 V

- 6 – 9 COM2 (0 V)

- 7 +12 V

- 8 -12 V

PWI MeetingKanazawa 25/03/2006

slide14

Resources (1)

  • PCB size
  • A5 format (210 x 148) refer to MDP document Part 2 Hardware (Sept. 2005).
  • Mass
  • - naked PCB A5 format : 114 g
  • - varnish + screws + miscellaneous : 18 g
  • - FPGA 25 g
  • - sinus memory + DAC + amplifiers + switches 20 g
  • (only one synthesizer output channel)
  • - other electronics 30 g
  • - 3 MDM connectors 25 g
  • - 2 current probes : 40 g
  • - sinus memory + DAC + amplifiers + switches : 20 g
  • (second output channel for WPT calibration)
  • Total synthesizer 2 channels : 292 g

PWI MeetingKanazawa 25/03/2006

slide15

Resources (2)

  • 3) Power consumption (mW)
  • Depending on modes.
  • The most part of analogue components are supplied with + & - 5 V to save power.
  • The -5 V is produced from -12 V by a voltage regulator.
  • When unused, the components are switched off (current probes, second synthesizer channel).

Supply voltages +3.3 V +5 V +12 V -12 V Total

Sphere modes and Basic mutual mode 198 56.5 6 166 426.5

Single wire mode 198 96.5 6 262 562.5

Double wire mode and Complex 198 136.5 6 358 698.5

mutual mode or antenna deployment

WPT calibration 231 113 6 326 676

PWI MeetingKanazawa 25/03/2006

slide16

Planning – Manpower - Funding

  • AM²P planning to be updated according to the PWI planning.
  • Manpower :

- J.L. Michau TM

- F. Colin TM deputy – on-board S/W

- C. Cavoit current probe

- T. Hachemi electronics

- M. Lévêque A.Q.

- CDD EGSE + electronics.

  • Funding secured by CNES for 2006 – 2007, and then by a contract until launch.

PWI MeetingKanazawa 25/03/2006

slide17

Pending questions

  • WPT calibration to be defined ASAP.
  • Interfaces with MEFISTO to be fixed ASAP.
  • AM²P measurement cycle is proposed to be about 1.5 s every 6 s : this period has to be fixed ASAP.
  • Possibility to skip data from the unused channel, in order to improve the AM²P performances on the used channel.
  • Data flow in low rate : about 0.04 kbs (modulus, phase,…).

PWI MeetingKanazawa 25/03/2006