KPL/IK RPWI Instrument Kernel =============================================================================== This instrument kernel (I-kernel) contains the Radio and Plasma Wave Instrument (RPWI) sensors' parameters and field-of-view (FOV) definitions. Version and Date ------------------------------------------------------------------------------- Version 0.2 -- June 04, 2016 -- Marc Costa Sitja, ESAC/ESA Updated all NAIF ID codes from -907* to -28* since the JUICE spacecraft NAIF ID has been updated from -907 to -28. Initial Release. Pending review by the RPWI instrument team. Version 0.1 -- May 12, 2016 -- Jorge Diaz del Rio, ODC Space Added instrument description. Version 0.0 -- April 26, 2016 -- Jorge Diaz del Rio, ODC Space Initial Release. Pending review by the RPWI instrument and JUICE Science Operations Working Group teams. References ------------------------------------------------------------------------------- 1. ``Kernel Pool Required Reading'' 2. ``C-kernel Required Reading'' 3. JUICE Frames Definition Kernel (FK), latest version. 4. ``JUICE - Jupiter Icy Moons Explorer. Exploring the emergence of habitable worlds around gas giants. Definition Study report,'' ESA/SRE(2014)1, September 2014 (JUICE Red book v1.0) 5. ``JUICE - JUpiter Icy Moons Explorer RPWI (Radio & Plasma Waves Investigation) Experiment Interface Document - Part B,'' JUICE-IRF-RPWI-EID-003, Issue 2.1, 16 June 2013 Contact Information ------------------------------------------------------------------------------- If you have any questions regarding this file contact SPICE support at ESAC: Marc Costa Sitja (+34) 91-8131-457 mcosta@sciops.esa.int, esa_spice@sciops.esa.int or NAIF at JPL: Boris Semenov (818) 354-8136 Boris.Semenov@jpl.nasa.gov Implementation Notes ------------------------------------------------------------------------------- Applications that need SPICE I-kernel data must ``load'' the I-kernel file, normally during program initialization. The SPICE routine FURNSH loads a kernel file into the pool as shown below. CALL FURNSH ( 'frame_kernel_name' ) -- FORTRAN furnsh_c ( "frame_kernel_name" ); -- C cspice_furnsh, frame_kernel_name -- IDL cspice_furnsh( 'frame_kernel_name' ) -- MATLAB Loading the kernel using the SPICELIB routine FURNSH causes the data items and their associated values present in the kernel to become associated with a data structure called the ``kernel pool''. Once the file has been loaded, the SPICE routine GETFOV (getfov_c in C, cspice_getfov in IDL and MATLAB) can be used to retrieve FOV parameters for a given instrument or structure. The application program may obtain the value(s) for any other IK data item using the SPICELIB routines GDPOOL, GIPOOL, GCPOOL (gdpool_c, gipool_c, gcpool_c in C, cspice_gdpool, cspice_gipool, cspice_gcpool in IDL and MATLAB). See [1] for details. This file was created with, and can be updated with a text editor or word processor. Naming Conventions and Conventions for Specifying Data ------------------------------------------------------------------------------- All names referencing values in this IK file start with the characters `INS' followed by the NAIF JUICE spacecraft ID number (-28) followed by a NAIF three digit ID code for the RPWI sensors. This is the full list of names and IDs for the RPWI instrument described by this IK file: Name NAIF ID --------------------- --------- JUICE_RPWI_LP1 -28705 JUICE_RPWI_LP2 -28715 JUICE_RPWI_LP3 -28725 JUICE_RPWI_LP4 -28735 JUICE_RPWI_RWI -28740 JUICE_RPWI_SCM -28750 The remainder of the keyword name is an underscore character followed by the unique name of the data item. For example, the SCM dipole boresight direction in the JUICE_RPWI_SCM frame is specified by: INS-28750_BORESIGHT The upper bound on the length of the name of any data item is 32 characters. If the same item is included in more than one file, or if the same item appears more than once within a single file, the latest value supersedes any earlier values. Instrument Description and Overview ------------------------------------------------------------------------------- The Radio & Plasma Wave Investigation (RPWI) provides an set of electromagnetic fields and cold plasma instrumentation, where several different types of sensors will sample the thermal plasma, DC electric fields, electric and magnetic signals from radio, plasma waves and micrometeorite impacts, as well as monitoring the spacecraft potential and integrated EUV flux (see [4] and [5]). RPWI is a versatile instrument for in situ investigations of the highly dynamic and, in many respects, very different space plasma environments, which will be encountered by the JUICE spacecraft around Jupiter's icy moons and in Jupiter's magnetosphere. To this end, RPWI makes use of several different sensors and receivers. Altogether, the instrument uses 10 sensors and 3 receivers, which cover a wide frequency range, from DC up to 45 MHz. There are 4 Langmuir probes (LP-PWI) for plasma and electric field measurements, a search coil magnetometer (SCM) with 3 coils for magnetic fields measurement, and 3 radio antennas (RWI). Thus, the RPWI sensors provide complete measurements of the electric and magnetic field vectors. This makes it possible to unambigously measure true physical observables, such as the energy flux (Poynting vector) and the wave polarization. The radio antennas provide remote sensing capabilities to RPWI, including the possibility to perform polarimetry and direction finding of coherent (non-thermal) radio emissions. The functional description of the RPWI system is most conveniently described in terms of its three different experiments, GANDALF, MIME, and JENRAGE (see [5] for further details): - GANDALF (GANymede plasma Density And Low-Frequency wave instrument): - LP-PWI (Langmuir Probe - Plasma Wave Instrument) - SCM (SearchCoil Magnetometer) - LP receiver - LF receiver - MIME (Mutual IMpedance Experiment) - LP-PWI - RWI (Radio Wave Instrument) - LP receiver - HF receiver - JENRAGE (Jupiter ENvironment Radio Astronomy and Ganymede Exploration) - RWI antenna - HF receiver GANDALF makes use of four spherical Langmuir probes (LP-PWI), 10 cm in diameter, mounted on separate 3 metre long deployable booms. The probes can be operated in two different modes: - current sampling mode (used as Langmuir probes) or; - voltage sampling mode (used as electric field probes). The LP and LF receivers are the main receivers for the LP-PWI probes. The Search Coil Magnetometer (SCM), which will be mounted on the J-MAG boom, is connected directly to the LF receiver. In addition, the probes serve the MIME experiment, which use them for transmission and reception for frequencies up to 1.47 MHz. For higher frequencies (up to 3 MHz), the probes are used for tramsission and the RWI antenna for reception. The MIME drivers are then synchronized to the frequency of the HF receiver. The functionality of the MIME subsystem is that of a laboratory network analyzer, which is an advanced Ohm-meter used to measure the frequency dependent complex impedance of an unknown device or medium. The medium, in this case the space plasma, is stimulated by a sinusoidal signal, which is and transmitted by one pair of Langmuir probes and received by the other pair. During normal operations in the HF range (above 1.47 MHz up to 45 MHz) the RWI antennas will be used for reception. JENRAGE makes use of three 2.5 meter long mutually perpendicular radio antennas (RWI) to measure three components of the high-frequency electric field in the 0.08 - 45 MHz range. The main characteristics of RPWI sensors are provided in the following table: LP-PWI: -------------------------------------------------------------------- PARAMETER VALUE ------------------------------ ----------------------------------- Frequency band DC- 1.47 MHz Sensitivity (DC E-field) 1 mV/m (1) Sensitivity (AC E-field) 10 nV/m/Hz-1/2 @ 1MHz Density range (Electrons) 10-4 to 10+5 Density range (Ions) 1 to 10+5 Temperature range (Electron) 0.02 - 30 eV Temperature range (Ion) 0.02 - 20 eV Probe bias voltage -100 to +100 V Probe bias current -100 to +100 nA Input impedance >10+12 (E-field); <100 (Density) -------------------------------------------------------------------- (1) Error @ DC: <7 mV/m (in Jupiter's magnetosphere) <1 mV/m near icy moons LP-Receiver: -------------------------------------------------------------------- PARAMETER VALUE ------------------------------ ----------------------------------- Frequency band DC-1.47 MHz (E-field) DC-10 kHz (Density) Max E-field amplitude +/-0.5 V/m Dynamic range >100 dB (E-field) >120 dB (Density) -------------------------------------------------------------------- LF-Receiver: -------------------------------------------------------------------- PARAMETER VALUE ------------------------------ ----------------------------------- Frequency band 0.1 - 20000 Hz Maximum AC M-field amplitude 5 nT Maximum E-field amplitude 1 V/m Dynamic range >70 dB Input impedance >5000 Ohm -------------------------------------------------------------------- RWI: -------------------------------------------------------------------- PARAMETER VALUE ------------------------------ ----------------------------------- Frequency band 0.08 - 45 MHz Sensitivity 2 to 3 nV/Hz1/2 @ 10MHz 10 nV/Hz1/2 @ 10MHz (2) Gain 20 dB Cross-talk <-40 dB 2nd harmonic distortion <-40 dB Input swing 0.12 V (Peak-to-peak) Output swing 1.2 V (Peak-to-peak) Output impedance 50 Ohm Ripple 20 mV (3) -------------------------------------------------------------------- (2) Including antenna gain. (3) Peak-to-peak, within the working frequency band. SCM: -------------------------------------------------------------------- PARAMETER VALUE ------------------------------ ----------------------------------- Frequency band 0.1 - 20000 Hz Sensitivity 4 fT.Hz-1/2 @ 4kHz Scale factor 100 mV/nT Output swing 6 V (4) Output impedance >1 kOhm Ripple 0.1mV (5) -------------------------------------------------------------------- (4) 50nT peak-to-peak @ Full Scale. (5) Peak-to-peak within the working frequency band. MIME: -------------------------------------------------------------------- PARAMETER VALUE ------------------------------ ----------------------------------- Frequency band (LP/LP mode) 1-1470 kHz Frequency band (LP/RWI mode) 80-3000 kHz Density range 0.01-10000 particles/cm3 Temperature range 0.01-100 eV Density resolution <5% Temperature resolution <15% Data Acquisition 1 spectra/min (Survey mode) 8 spectra/min (Burst mode) Emission signal 2 V (6) Output impedance ~10+6 Ohm -------------------------------------------------------------------- (6) Peak-to-peak @ Full Scale; Depending on the distance between transmission probes and reception probes Mounting Alignment ------------------------------------------------------------------------------- Refer to the latest version of the JUICE Frames Definition Kernel (FK) [3] for the RPWI reference frame definitions and mounting alignment information. Platform ID --------------------------------------------------------------------------- This number is the NAIF instrument ID of the platform on which the sensors are mounted. For Langmuir Probes (LPx) this platform is the corresponding boom (LPBx); for SCM and RWI sensor this platform is the Magnetometer Boom (MAG Boom). Please refer to the latest version of the JUICE NAIF ID Codes Definitions [3] for mapping of ID codes to sensor and structure names. \begindata INS-28705_PLATFORM_ID = ( -28701 ) INS-28715_PLATFORM_ID = ( -28711 ) INS-28725_PLATFORM_ID = ( -28721 ) INS-28735_PLATFORM_ID = ( -28731 ) INS-28740_PLATFORM_ID = ( -28031 ) INS-28750_PLATFORM_ID = ( -28031 ) \begintext