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Update and Functional Test Results for SWIM: Solar System Physics and Space Technology

This workshop presents the latest findings and test results for the Solar Wind Monitor (SWIM), a low-resource ion mass analyzer. The test results cover the sensor characteristics, scientific objectives, test setup, and functional test outcomes.

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Update and Functional Test Results for SWIM: Solar System Physics and Space Technology

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  1. Title Update and functional test results for SWIM David McCann Solar system physics and space technology IRF, Kiruna Supervisor: Professor Stas Barabash David McCann, IRF (david.mccann@irf.se) Workshop, Estec 14-15/9

  2. Deflector high voltage plates i+ 2. Ion traversing the analyzer channel. 1. Incoming ion directed into the aperture by the electrostatic deflector. Analyzer high voltage plate i+ TDC START CCEM TOF STOP CCEM e- STOP plate START plate n e- 3. Ion hitting the conversion surface yielding electrons detected by the START CCEM. 4. Scattered neutral hitting the STOP plate yielding electrons detected by the STOP CCEM. Update and functional test results for SWIM Introduction • SWIM – Solar WInd Monitor • Low resource ion mass analyzer • Relying on time-of-flight technique • From significant point of view, a little sister to the MIPA sensor included in the SERENA package accepted to fly on-board the ESA BepiColombo MPO mission to Mercury (2014?) • Launch Mar 2008 on the Indian Chandrayaan-1 mission to the Moon David McCann, IRF (david.mccann@irf.se) Workshop, Estec 14-15/9

  3. Update and functional test results for SWIM Sensor characteristics Two major modules: i) sensor head ii) electronics board housing David McCann, IRF (david.mccann@irf.se) Workshop, Estec 14-15/9

  4. Update and functional test results for SWIM Scientific objectives Primary objective: • Monitoring of the solar wind to support sputtered/back scattered ENA studies Secondary objectives: • Investigating the possible occurrence of local magnetic fields on the lunar surface. • Studying sputtered ions from the lunar surface to investigate eg. permanently shadowed areas. • Studying the dynamic structure of the lunar wake. David McCann, IRF (david.mccann@irf.se) Workshop, Estec 14-15/9

  5. Update and functional test results for SWIM Test setup • Tests performed at the calibration facilities at IRF, Kiruna. • Capable of creating ions with energies up to 50keV/q • Various species (H+, H2+, H3+, O+, H2O+, N2+/O2+, Ar+) • Pressure ~ 3-4*10-7 mbar David McCann, IRF (david.mccann@irf.se) Workshop, Estec 14-15/9

  6. Update and functional test results for SWIM Test setup David McCann, IRF (david.mccann@irf.se) Workshop, Estec 14-15/9

  7. Deflector high voltage plates i+ Analyzer high voltage plate i+ TOF START CCEM STOP CCEM START plate STOP plate e- Update and functional test results for SWIM Functional test outcome • Several issues regarding the HVPS was identified • Ripple on the high voltage outputs • Non-zero minimum on high voltages • Mechanical manufacturing error • Analyzer channel walls not aligned to the same origo 0.104 mm 0.133 mm David McCann, IRF (david.mccann@irf.se) Workshop, Estec 14-15/9

  8. Update and functional test results for SWIM Functional test outcome • Different settings to the deflector plates will scan through the azimuthal acceptance angle. • Plot showing pixel size at certain viewing angels. • Bold boxes is from calibrations, hollow markers from simulations. • Pixel size increasing with increasing angle. David McCann, IRF (david.mccann@irf.se) Workshop, Estec 14-15/9

  9. Update and functional test results for SWIM Functional test outcome • TOF spectra for H+ and H2O+. • Nicely separated primary particle peaks • Ion recoil problem • Seems to be unavoidable? • Can be subtracted from results by calibration of occurrence. David McCann, IRF (david.mccann@irf.se) Workshop, Estec 14-15/9

  10. Update and functional test results for SWIM Functional test outcome • TOF spectra for H2O+ using different post-acceleration settings. • One can clearly see the influence on the TOF-spectra. David McCann, IRF (david.mccann@irf.se) Workshop, Estec 14-15/9

  11. Update and functional test results for SWIM Functional test summary • Several issues regarding hardware were identified and corrected for. • The instrument performance meets the specifications in most aspects. • FM calibrations will thoroughly determine performance and prefered sensor settings. • Major point still pending satisfactory solution is the ion recoil problem. • FM calibrations will start during October 2006 • Good luck in trying to get hold of David during the fall/winter of 2006. David McCann, IRF (david.mccann@irf.se) Workshop, Estec 14-15/9

  12. Title Update and functional test results for SWIM David McCann Solar system physics and space technology IRF, Kiruna Supervisor: Professor Stas Barabash David McCann, IRF (david.mccann@irf.se) Workshop, Estec 14-15/9

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