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Search Coil Magnetometer (SCM) Mission PDR/CAR Alain Roux CETP-Velizy Co-i: O.Le Contel

Search Coil Magnetometer (SCM) Mission PDR/CAR Alain Roux CETP-Velizy Co-i: O.Le Contel Technical Manager: B.de la Porte Engineer: A.Bouabdellah & C.Coillot Technicians: D.Alison & S.Ruocco. SCM Requirements & Specifications Block Diagrams Electrical Mechanical and Thermal

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Search Coil Magnetometer (SCM) Mission PDR/CAR Alain Roux CETP-Velizy Co-i: O.Le Contel

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  1. Search Coil Magnetometer (SCM) Mission PDR/CAR Alain Roux CETP-Velizy Co-i: O.Le Contel Technical Manager: B.de la Porte Engineer: A.Bouabdellah & C.Coillot Technicians: D.Alison & S.Ruocco

  2. SCM Requirements & Specifications Block Diagrams Electrical Mechanical and Thermal Mass and Power Development Plans Peer Review Results Overview

  3. Mission Requirements

  4. Mission Requirements

  5. Sensor Requirements

  6. SCM Boom Requirements

  7. Block diagram • Preamplifier Box unit • Main functions: • Calibration • Regulated power supply • Low noise preamplifier, • 3 channels • Same design as Cluster Christophe Coillot

  8. Input Signal Amplified Signal antenna Vin Feedback Mechanical & Electrical Design Preamplifier Principle : Vout Input from calibration network Calibration Signal 1 layer in the Regulator module • 1st level of amplification • 46 dB Gain • few noise • Feedback • 2nd level of amplification • 31 dB Gain • Bandwidth 0.25mHz to 4 KHz 1 layer in the Amplifier module 1 layer in the Amplifier module

  9. Electrical design • Preamplifier design • Prototype exists • Fits requirements (sensitivity, power). • Measurement conditions close to • Flight model : • Same design for sensor • Same kind/length for cable • Same design as 3D+ PA • Powered by 3D+ voltage • regulator Christophe Coillot

  10. Mechanical & Electrical Design • 3 radiation shielding levels • BBM exists; no risk • 3D+ has large experience; generic evaluation CNES/ESA/NASA 2002, qualification CNES/ESA 2003 Heating network * 1st amplification level Radiation Shielding (Tantalium plates) 2nd amplification level * Circuit not included for the THEMIS mission

  11. Preliminary design meets all system requirements Mass & Power

  12. SCM sensitivity curve (BBM; measured in the lab) Electrical

  13. Instrumentation Interfaces with DFB defined and documented (see DFB presentation) Proposed design will meet functional requirements Detailed design proceeding Risks have been identified (tight schedule); under control; close interaction with UCB. Sufficient maturity in design (existing BBM) to proceed to detailed design Thermal design: a MLI is requested around SCM antennas (UCB responsibility) Cluster heritage illustrates reliability of the design Ground Support Equipment SCM antennas+PA tested at Chambon la Foret Magnetic axis knowledge +/- 0.2° Short tests at S/C level with antennas in mu-metal boxes Electrical

  14. mechanical

  15. Mechanical Structure Design proposed by GDTech has been iterated. It is now agreed upon by CETP&UCB. Numerical analyses will start to check for vibration load…Preliminary analyses shows that mass is below specs. Design modified in agreement with suggestions made by review committee: differential dilatation between Ketron Peek&aluminium. Design modified to allow the passage of the cable inside boom, as requested by UCB. Thermal A thermal blanket is needed during eclipses. This is provided by UCB. Mechanical & Thermal

  16. Mechanical

  17. Mechanical

  18. Breadboarding/Eng Modeling BBM of antennas and PA exist and meet specs Part list for PA is frozen; fabrication of EM is starting Tests EM beginning of january PA Flight Units FM1+2+3: sept 24 FM4+5+FS: nov. 19 Schedule is tight for FM1/PA delivery No problem expected for antennas and structures Development Plans

  19. Status of RFAs RFA1: -AC magnetic cleanliness Status - Main issue is solar cells rotation (non circular S/C). Magnetic modeling will be made to estimate spurious noise at SCM location, once the info on solar cell wiring is available. UCLA is conducting a mag-cleanliness program; they have the software to carry out this evaluation -CETP can help by providing a “sniffer”, to measure spurious noise from s/c, and from other instruments. Involves some extra cost. Peer Review Results

  20. RFA2: -Schedule problem with FM1/PA -Part list to be agreed with UCB Status: -delivery of FM1 together with FM2&3 on september 24th; agreed with UCB. -Final part list sent to UCB nov 10th. RFA3: -Alignment budget Status : -Magnetic axis determined within 0.2% during tests at Chambon, once the antenna are mounted on their structure. -Main difficulty is stability/knowledge of boom axis. Peer Review Results

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