From raw data to gas densities and composition

Data analysis tutorial

Applicable documentsROSINA USER MANUALDFMS Instrument modesRTOF Instrument modesCOPS Instrument modesEAICD

ROSINA User manualNo. Experiment Mode DPU DFMS RTOF COPS Power (W) Data Rate (bits/s)

0 Instrument off Off off off off 0 0

D1 DPU Booting on off off off 6 0

D2 DPU Standby on off off off 4.5 25

D3 DPU Emergency on off off off 4.5 500

S1 RTOF Standby on off stby Micro 20.5 1L

1L RTOF Low Power on off on Micro 29 1k

1G RTOF Gas on off on Micro 32 1k

1I RTOF ion on off on Micro 29 500

1 RTOF Full (Gas and Ion)

on off on Micro 42 1.5k

S2 DFMS Standby on stby off Micro 25 25

2 DFMS on on off Micro 28 1k

3 DFMS Narrow on on off Full/nude 31 1k

S4 RTOF + DFMS Standby

on stby stby Micro 36.5 25

4 RTOF Single + DFMS on on on Full 52 2k

S5 COPS Standby on off off stby 8 25

G5 COPS Ground test on off off stby 8 500

5M COPS monitoring on off off Nude/Micro

9 25

5 COPS Full on off off Full 11 25

The allowed ROSINA instrument mode configurations are specified in the following table:

Instrument Mode Documents

Mode tablesDetector Operation incl. data acquisition

systemsData analysis basics

DFMS Modes and Sequences

Numbering

0: GAS,COM,LOW1: GAS,COM,LOW, background2: GAS,COM,HIG3: GAS,COM,HIG, background5: ION,COM,LOW6: ION,COM,LOW, background7: ION,COM,HIG8: ION,COM,HIG, background9: NOI

0 to 49: Basic modes for switch on50 to 99 Bake-out and other

technical modes100 to 199 Basic optimization and

calibration modes200 to 999 Standard survey modes 1000 to 1999 Modes specialized for

scientific question2000 to 9999 Custom modes

DFMS Instrument modesMode Description

Function Task Cover Emission

GCU Reg. ELE Res. Zoom Det Masses Int. Duration

       approx. Abs. Pos     (eV)         (s) approx

                           Switch on/Switch off

1Switch off, cover open OFF COM n/a   n/a n/a n/a n/a n/a n/a n/a

5Gas, MCP, LoEm, LR, switch on GAS COM   LoEm   45 Low 1 MCP SEL{9} 12 8'

10Standby, Subemission                        

                           Bakeout Modes

50Ion Source Bakeout 10' OFF

Bake out   OFF   OFF OFF OFF OFF n/a n/a 13'

51Ion Source Bakeout 60' OFF

Bake out   OFF   OFF OFF OFF OFF n/a n/a 61'

                           Inflight Calibration

150

Gas, MCP,MedEm, LR, medGCU GAS CAL   MedEm MedGCU 45 Low 1 MCP SEL{10} 10 20'

151

Gas, MCP,MedEm, LR, lowGCU GAS CAL MedEM LowGCU 45 Low 1 MCP SEL{10} 10

22'(FM 25.3.2010)

152

Gas, MCP, MedEM, HR, medGCU GAS CAL   MedEm MedGCU 45 High 6.2 MCP SEL{10} 10 22'

153

Gas, MCP, MedEM, HR, lowGCU GAS CAL   MedEm LowGCU 45 High 6.2 MCP SEL{10} 10  

154

Gas, MCP, LowEM, LR, medGCU GAS CAL   LowEm MedGCU 45 Low 1 MCP SEL{10} 10  

155Gas, MCP, HiEM, LR, lowGCU GAS CAL   HiEm LowGCU 45 Low 1 MCP SEL{10} 10  

156

Gas, MCP, LowEM, HR,medGCU GAS CAL   LowEm MedGCU 45 High 6.2 MCP SEL{10} 10  

157Gas, MCP, HiEM, HR,lowGCU GAS CAL   HiEm LowGCU 45 High 6.2 MCP SEL{10} 10  

160

Gas, CEM, MedEM, LR, medGCU GAS CAL   MedEm MedGCU 45 Low n/a CEM SEL{1}    

DFMS mass tablesTable of masses for the SEL parameter

Entry #

Mode M1 M2 M3 M4 M5 M6 M7 M8 M9 M10

M11

M12

M13 M14

M15 M16 M17

M18 M19 M20

0 GCU 44 28 20 132                                1 GCU-

Mode44 45 28 22 20 16 13 12 44 132 128 129 130 131 132 133 134 136 66  

2 Water 18                                      3 CO2 44 45 28 22 16 13 12 44                        4 Ne 20 22 20                                  5 Xe 132 128 129 130 131 132 133 134 136 66 132                  

                                           6 Cometary

gas18 28 44                                  

7 13C 12 13 12 13 12                              8 M28 28                                      9 CO2 44 45 28 22 16 44                            

10 GCU-Mode

44 45 28 22 20 16 44 132 128 129 130 131 132 133 134 136 66 44    

DFMS SequencesSequence Description Repetitions and Modes Duration

FM test (date & sw)

1 Gas, MCP & CEM, complete 1X(M220,M222, M320,M322,M1) ? ?

7 GCU, MCP & CEM, complete 1x(M150,M152,M160,M162,M5) ? ?

13 Asteroid Sequence m15,5 10x (7x M1100) est. 45' ?

16 GCU, MCP: LR, HR 1x (M150, M152) 35' Mai/June 2009, V72

19 GCU, CEM: LR, HR 1x (M160, M162) ? ?

22 Background, MCP, HiEm: LR, HR 1x (M220, M222) 72' Mai/June 2009, V72

25 Background, CEM, HieM: LR, HR 1x (M320, M322) ? ?

28 Gas, MCP, early comet 20x (M520) 57' Mai/June 2009, V72

31 Gas, CEM, early comet 20x (M540) est 180' ?

34 Gas, MCP, HiEm, m13-50: LR, HR 3x (M500, M502) 102' Mai/June 2009, V72

38 Gas, CEM, HiEm, m12-50: LR, HR 1x (M530, M532) 152' Mai/June 2009, V72

42 Asteroid Sequence m18.5 10x (7x M550) 57' Jan 2010

45 GCU, MCP: LR+HR, MedEm, LowGCU 1x (M151, M153) 37' 25.3.2010 V762

48 GCU, MCP: LR+HR, HiEm, LowGCU 1x (M155, M157) 37' 25.3.2010 V762

51 GCU, MCP: LR+HR, LowEm, MedGCU 1x (M154, M156) 37' 25.3.2010 V762

116 same as S45   37' 01.04.2010 V763

216 same as S48   37' 01.04.2010 V764

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

RTOF Instrument modesM501 1G Storage Source, Survey, ETS low sensM503 1G/

1LOrtho Source, Survey, ETS_L low sens

M504 1I/1L

Ortho Source, ion, Survey, ETS_L low sens

M505 1 Both Sources, Gas and Ion, Survey, ETS and ETS_L low sens

M506 1G Storage Source, Survey, ETS low sens, 5kHz

M508 1G Storage Source, Survey, ETS low sens 2kHz

M511 1G Storage Source, Survey, ETS med sens, 10 kHzM513 1G/

1LOrtho Source, Survey, ETS_L med sens

M515 1 Both Sources, Gas and Ion, Survey, ETS and ETS_L med sens

M516 1G Storage Source, Survey, ETS med sens, 5kHzM518 1G Storage Source, Survey, ETS med sens 2kHz

RTOF mass rangeExtraction frequency

(kHz)

Max flight time (ms)

Upper address Max. mass

10 57.9 35000 200

5 119.4 72364 840

2 176 106667 1800

ds acc

T0

COPS0: General for COPS Instrument / DPU action modes1: NUD, OFS2: NUD, AMB{ RN, RM } 3: RAM, OFS4: RAM, AMB{ RN, RM }5: BOT, OFS6: BOT, AMB{ RN, RM }

0 to 49: Basic modes for switch on/off49 to 99: Basic offset modes100 to 299: Basic emission modes300 to 499: Standard survey modes500 to 999: Custom modes

COPS

Offset

M51 0 180V 0 - - - F: x Filament offsetM53 - - - 0 180V 0 M: x Microtips offsetM55 0 180V 0 0 180V 0 F & M: x Fil. & Microtips offset

…

Measurement

modes

M312 0.9A 180V15uA /LR

/MIon- - - F: 1 (left) Mode(NUD,AMB {0,0},

EMI{1,0,2,0})

M322 0.9A 180V Auto - - - F: 1 (left) Mode(NUD, AMB {0,0}, EMI{1,0,1,0})

M332 0.9A 180V100uA /

HR /LIon

- - - F: 1 Mode(NUD, AMB {0,0}, EMI{1,0,0,0})

M342 0.9A 180V15uA /LR

/HIon- - - F: 1 (left) Mode(NUD, AMB {0,0},

EMI{1,0,3,0})

M352 0.9A 180V15uA /LR

/LIon- - - F: 1 (left) Mode(NUD, AMB {0,0},

EMI{1,0,1,0})

M362 0.9A 180V100uA /

HR /MIon

- - - F: 1 (left) Mode(NUD, AMB {0,0}, EMI{1,0,0,0})

Mode Nude gauge Ram gauge Emitter(s) Remark

- -

Filament

current limit

Filament

Anode Grid V

Filament

Regulation

value / Range

Microtips

current limit

microtips

Anode Grid V

Microtips

Regulation value / Range

Microtips-Arrays / Filament -

COPSCalibration•All measurements were performed with COPS mounted at CASYMIR (CAlibration SYstem for the Mass spectrometer Instrument Rosina)•Reference gauge : Granville-Phillips Stabil-Ion (Series 370) ionization gauge •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.OperationAt 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.

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 DFMSOS or SS; for RTOFNG, RG; BG, SN or SR for COPS

DATE: DATE from DPU Timestamp in the format YYYYMMDDYYYY (Year) MM (Month) DD (Day)

TIME: TIME from DPU Timestamp in the format HHMMSSsssHH (Hour) MM (Minutes) SS (Seconds) sss (fractional milliseconds)

INSTRUMENTMODE: Particular instrument mode according to HK in Science PacketEXTENSION: TAB (File extension)

Example: CE_20141120_081042333_M0123.TABDFMS CEM file recorded on 20. November 2014 at 08h 10m 42.333s during mode 123.

Dataset.cat Data set Overview ================= On March, 2, 2004, the Rosetta spacecraft was launched towards comet 67P /Churyumov Gerasimenko. 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.

DFMS Data