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From raw data to gas densities and composition

From raw data to gas densities and composition. Data analysis tutorial. Applicable documents. ROSINA USER MANUAL DFMS Instrument modes RTOF Instrument modes COPS Instrument modes EAICD. The allowed ROSINA instrument mode configurations are specified in the following table:.

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From raw data to gas densities and composition

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  1. From raw data to gas densities and composition Data analysis tutorial

  2. Applicable documents • ROSINA USER MANUAL • DFMS Instrument modes • RTOF Instrument modes • COPS Instrument modes • EAICD

  3. The allowed ROSINA instrument mode configurations are specified in the following table: ROSINA User manual

  4. Instrument Mode Documents • Mode tables • Detector Operation incl. data acquisition systems • Data analysis basics

  5. DFMS Modes and Sequences Numbering 0: GAS,COM,LOW 1: GAS,COM,LOW, background 2: GAS,COM,HIG 3: GAS,COM,HIG, background 5: ION,COM,LOW 6: ION,COM,LOW, background 7: ION,COM,HIG 8: ION,COM,HIG, background 9: NOI 0 to 49: Basic modes for switch on 50 to 99 Bake-out and other technical modes 100 to 199 Basic optimization and calibration modes 200 to 999 Standard survey modes 1000 to 1999 Modes specialized for scientific question 2000 to 9999 Custom modes

  6. DFMS Instrument modes

  7. DFMS mass tables

  8. DFMS Sequences

  9. RTOF Instrument modes • 0: Other combinations of source,task,freq • 1: STO,GAS,ETS,10kHz • 2: STO,ION,ETS, 10 kHz • 3: ORT,GAS,ETS_L, 10 kHz • 4: ORT,ION,ETS_L, 10 kHz • 5: BOT,GAI, both ETS, 10 kHz • 6: STO,GAS,ETS,5 kHz • 7: ORT,ION,ETS_L, 5 kHz • 8: STO,GAS,ETS,2 kHz • 9: ORT,ION,ETS_L, 2 kHz • 0 to 49 Basic modes for switch on/off • 50 to 99 Bake out and other technical modes • 100 to 499 Basic optimization and calibration modes • 500 to 999 Standard survey modes • 1000 to 1999 Modes specialized for scientific questions • 2000 to 9999 Custom modes

  10. RTOF Instrument modes

  11. RTOF mass range 0 d s acc T

  12. COPS 0: General forCOPS Instrument / DPU actionmodes 1: NUD, OFS 2: NUD, AMB{ RN, RM } 3: RAM, OFS 4: RAM, AMB{ RN, RM } 5: BOT, OFS 6: BOT, AMB{ RN, RM } 0 to 49: Basic modesforswitch on/off 49 to 99: Basic offsetmodes 100 to 299: Basic emissionmodes 300 to 499: Standard surveymodes 500 to 999: Custom modes

  13. COPS

  14. COPS • Calibration • All measurementswereperformedwith COPS mountedat CASYMIR (CAlibrationSYstemfor the Massspectrometer Instrument Rosina) • Reference gauge : Granville-Phillips Stabil-Ion (Series 370) ionizationgauge • Argon was used as the calibration gas for all measurements over a pressure range from ~5×10-10 to ~1×10-6 mbar • All pressure values are normalized for Nitrogen and for 20°C. • Operation • At the beginning of operation the offset value of the electrometer is measured. This is repeated automatically every 24h, whereby the nude and the ram gauge offset measurements are shifted relative to each other by 12h.

  15. Experiment Archive Interface Document EAICD • File Naming Convention The file naming follows a strict rule. The filename consists of the following elements: DETECTOR_DATE_TIME_INSTRUMENTMODE.EXTENSION DETECTOR: MC, CE or FA; for DFMS OS or SS; for RTOF NG, RG; BG, SN or SR for COPSDATE: DATE from DPU Timestamp in the format YYYYMMDD YYYY (Year) MM (Month) DD (Day) TIME: TIME from DPU Timestamp in the format HHMMSSsss HH (Hour) MM (Minutes) SS (Seconds) sss (fractional milliseconds) INSTRUMENTMODE: Particular instrument mode according to HK in Science Packet EXTENSION: TAB (File extension) Example: CE_20141120_081042333_M0123.TAB DFMS CEM file recorded on 20. November 2014 at 08h 10m 42.333s during mode 123.

  16. Data set Overview ================= On March, 2, 2004, the Rosetta spacecraft was launched towards comet 67P /ChuryumovGerasimenko. Since then the ROSNA sensor has been tested and optimized for flight during several commissioning slots. All data so far from DFMS and RTOF concern either the in flight calibration gas or back- ground outgassing from Rosetta.Because of several uploads of new voltage settings the data cannot be compared between the different commissioning slots, neither in intensity nor in mass scale! The data can be used only for engineering purposes. The only data which can be used to evaluate the background pressure of Rosetta are the COPS data. Scientific data from DFMS and RTOF will only be available when Rosetta reaches the first asteroid. Parameters ========== DFMS and RTOF data contain neutral gas data as well as ion data. The data are raw, uncalibrated data. COPS contain pressure data of the background pressure and of some thruster firings from the nude gauge. Calibration =========== COPS data are calibrated. However, the calibration factor has been determined for Nitrogen gas, and may not be appropriate for the outgas- sing of Rosetta. Because the main outgassing component is unknown the correct factor to be used is also unknown. DFMS and RTOF data are uncalibrated and will remain uncalibrated because they have no scientific value. Dataset.cat

  17. DFMS Data

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