Data Set Overview :  This dataset contains data from COSIMA instrument in the Rosetta spacecraft. The set covers the substrate history from the calibration period of the instrument starting 2002-05-29 up to the payload checkout #13 2010-12-05.  During the calibration period the instrument was operated with several software versions and for test purposes the operations were not always nominal. The substrate histories are anyway considered to be complete.  During the first commissioning period from 2004-03-02 to 2004-06-06 the substrates from the target holder #D8 covering the dust inlet was stored.  During the second commissioning period from 2004-09-06 to 2004-10-16 the first ever in space secondary ion mass spectra were generated. These can be found from the substrate #1C2 data.  During the passive payload checkouts (PC) no science data was generated. The target holder #C2 was to be lifted to test the target manipulator unit. This failed in PC1 and PC3 due to hardware anomaly. Due to spacecraft telemetry problem, this history is not available from PC2 either.  Test images from empty COSISCOPE slot were taken in all payload checkouts. All the substrates were also imaged in space to be used later as initial reference images.  During the active checkouts the main operational concentration was to heal the baddly behaving ion emitter A. During those operations some spectra was acquired, but without intention to generate really scientifically usable background spectra from the substrates.  Version 3.0 of this dataset is meant to supersede all previous versions of this dataset. New products for scans and heating were added. Image data changed from the PDS3 IMG format to the PDS3 FITS format. House keeping ancillary data was added. Most importantly, the time interval was increased from ground to through payload checkout #13.  Parameters :  The primary measured parameter is the time of flight mass spectrum of a grain, ion events collected for 131072 time bins, each 1.953125 ns in length. For data selection purposes, three individual time windows can be selected for each generated spectrum. In addition or instead, a peak list separating the organic and inorganic peaks can be generated. For quantitive analysis and gain optimisation, instead of individual time bins, a sum of events in three time windows can be collected. These are called scans in the COSIMA system.  Grains in the substrate are searched with the COSISCOPE camera. COSISCOPE main task is to generate grains list of the prominent features on the substrate surface. The images itself can also be generated.   Processing :  The spectrum time of flight ion data is mass calibrated with the same procedure as is used in space for the peak data. The calibration should be used only as rude starting point and for scienctific analysis each calibration must be checked.  The housekeeping data covering the data aqcuisition period is calibrated to physical units and statistically analyzed were applicable to support the evaluation of the data quality.  Data :  COSIMA generates the following PDS products  spectrum -------- The spectrum is generated by bombing the comet grains collected on the substrate by indium ions. The seconday ions are measured by time of flight mass spectrometer. The spectrometer collects individual ion arriving times to an array of 131072 bins, each 1.953125 nanosecond in size. From accumulated ion data, peaks are detected and from the assumed mass scale and detected peak positions a mass is given to each time bin. This calibration is automatic and the user must check the scale for real use.  The spectrum can be divided in time to at most tree different subspectrums to reduce the amout of data to be transmitted.  The product files have the naming convention CS_YXX_YYYYMMDDTHHMMSS_SP_Z.TAB, where the Y is either 1 for top, 2 for middle and 3 for bottom substrate. The XX is target holder number in the range C1 to D8, counting in hexadecimal number base. The YYYYMMDDTHHMMSS gives the start year, month, day, hour, minute and second. The Z is P for positive and N for negative ion spectrum.  peaks ----- Generated as the spectrum, but the spectrum mass scale is established onboard COSIMA. The list of 300 first organic and inorganic peaks is transmitted. For higher masses, the total of count hits for a mass range is given.  The product files have the naming convention CS_YXX_YYYYMMDDTHHMMSS_PK_Z.TAB, where the Y is either 1 for top, 2 for middle and 3 for bottom substrate. The XX is target holder number in the range C1 to D8, counting in hexadecimal number base. The YYYYMMDDTHHMMSS gives the start year, month, day, hour, minute and second. The Z is P for positive and N for negative ion spectrum.  scan ---- Used for instrument calibration, gain optimisation or when moving over the substrate, to make a measurement matrix. Produces total sum of the event counts over three possible time windows.  The product files have the naming convention CS_YXX_YYYYMMDDTHHMMSS_SCAN.TAB, where the Y is either 1 for top, 2 for middle and 3 for bottom substrate. The XX is target holder number in the range C1 to D8, counting in hexadecimal number base. The YYYYMMDDTHHMMSS gives the start year, month, day, hour, minute and second. The Z is P for positive and N for negative ion spectrum.  heat ---- The substrate can be heated to clean it or to analyse volatile dust. The product contains the heating curve.  The product files have the naming convention CS_YXX_YYYYMMDDTHHMMSS_HEAT.TAB, where the Y is either 1 for top, 2 for middle and 3 for bottom substrate. The XX is target holder number in the range C1 to D8, counting in hexadecimal number base. The YYYYMMDDTHHMMSS gives the start year, month, day, hour, minute and second. The Z is P for positive and N for negative ion spectrum.  clean ---- The single substrate position can be cleaned by the Indium ion beam. The product contains the emitter tip current housekeepin statistics.  The product files have the naming convention CS_YXX_YYYYMMDDTHHMMSS_SCAN.TAB, where the Y is either 1 for top, 2 for middle and 3 for bottom substrate. The XX is target holder number in the range C1 to D8, counting in hexadecimal number base. The YYYYMMDDTHHMMSS gives the start year, month, day, hour, minute and second. The Z is P for positive and N for negative ion spectrum.  spectrum housekeeping --------------------- There's three kind of housekeeping information.  First, the minimum, maximum, mean and standard deviation of the analog data, temperatures, voltages and currents, is calculated for the period of the measurement.  Second, the used time to digital converter timing for the ion beam chopper, bunchers and ion optics is given.  Third, the time to digital converter temperature calibration for the delay line is given. The calibration is needed to adjust the delay line so, that the 16 bin hardware event counter gets even bin distribution over the sampling period.  The product files have the naming convention of either CS_YXX_YYYYMMDDTHHMMSS_S_HK.TAB for spectrum, CS_YXX_YYYYMMDDTHHMMSS_SCHK.TAB for scan or CS_YXX_YYYYMMDDTHHMMSS_CLHK.TAB for cleaning, where the Y is either 1 for top, 2 for middle and 3 for bottom substrate. The XX is target holder number in the range C1 to D8, counting in hexadecimal number base. The YYYYMMDDTHHMMSS gives the start year, month, day, hour, minute and second.  grains ------ The grain list is taken by the COSISCOPE camera from the substrate surface. The orientation of the substrate is calculated from the reference dots on target holder. The binding box of the substrate feature is given in substrate coordinates, which has origo at lower left corner and is 10000 times 10000 micrometers. The grain quality, based on the brightness is given as relative number from 0-255.  The product files have the naming convention CS_YXX_YYYYMMDDTHHMMSS_GR__.TAB, where the Y is either 1 for top, 2 for middle and 3 for bottom substrate. The XX is target holder number in the range C1 to D8, counting in hexadecimal number base. The YYYYMMDDTHHMMSS gives the start year, month, day, hour, minute and second.  image ----- The image take by the COSISCOPE camera. The image has 1024*1024 pixels resolution with 10 bit brightness information. The PDS product uses 16 bits for brightness storage.  The product files have the naming convention CS_YXX_YYYYMMDDTHHMMSS_IM_Z.FIT, where the Y is either 1 for top, 2 for middle and 3 for bottom substrate. The XX is target holder number in the range C1 to D8, counting in hexadecimal number base.The YYYYMMDDTHHMMSS gives the start year, month, day, hour, minute and second. The ZX is P for right (plus) side and N for left (minus) side led illumination. Previous to dataset version 3.0, the product files were in *.IMG format.  The image files can be viewed only with software, that understands PDS data formats, like 'NASAView', available from PDS.  COSISCOPE housekeeping ---------------------- For the COSISCOPE housekeeping the operating temprature mimimum, maximum, mean and standard deviation is calculated for the operation time period. In addition, the COSISCOPE operation setup parameters are given. Also the subsrate orientation information is given.  The product files have the naming convention CS_YXX_YYYYMMDDTHHMMSS_G_HK.TAB, where the Y is either 1 for top, 2 for middle and 3 for bottom substrate. The XX is target holder number in the range C1 to D8, counting in hexadecimal number base.The YYYYMMDDHHMMSS gives the start year, month, day, hour, minute and second.  Ancillary Data :  Other data required to interpret this data, especially if it is not included in the dataset (for example, laboratory calibration values)  Coordinate System :  COSIMA substrates are exposed 3 at a time to the +Z side of the spacecraft. The dust funnel has 20 * 34 degree field of view.   ^ | direction of | flight |  ^ +Xcosima (down-track) | | --- +---------|---------+ ^ | | | | | | | | | | | | | | | | 20 deg | x-------------> +Ycosima (cross-track) | | +Zcosima | | | | | | | V | | --- +-------------------+  | 34 deg | Boresight (+Z axis) |<----------------->| is into the page | |  No S/C geometry is calculated for the data.  Software : All the data can be used by PDS tools or any ASCII reading software.  Media/Format :  The data is delivered as PDS standard compliant electronic files.

Confidence Level Overview :  The data have been automatically processed from raw data. Care should be taken in spectrum analysis, the housekeeping values for operating voltages should be checked for possible anomalies. Some of the operations during the calibration were really outside of normal instrument operation.  Review :  The dataset review is available from the RO-EST-RP-3461, ROSETTA Science Archive 1st Delivery Review Report for Orbiter instruments (15 March 2007). This covers the dataset v1.0, where there was no spectrum mass scale.  Data Coverage and Quality :  The data covers the COSIMA flight model operations from the flight substrate delivery 2002-05-29 to the all payload checkouts up 2010-12-05 before the hibernation.  The production of the substrates is not part of the substrate history.  Regardless of the several anomalies in the instrument operations during the calibration period, the substrate histories are complete.  Limitations :  Housekeeping data outside spectral measurements and COSISCOPE operations is not delivered. This would include indium ion emitter history and target manipulator operations. Though vital to the instrument operations, they are not needed in the scientific interpretation of the COSIMA data.