New Horizons Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI) KEM1 Cruise Raw Data, Version 1.0

This data set contains Raw data taken by the New Horizons Pluto Energetic Particle Spectrometer Science Investigation instrument during the CRUISE TO FIRST KBO ENCOUNTER mission phase. These data were migrated from the PDS3 dataset: NH-X-PEPSSI-2-KEMCRUISE1-V2.0. Some data from PLUTO ENCOUNTER has been included. This is due to data being replayed after the PLUTO ENCOUNTER PDS Deliveries. PEPSSI (Pluto Energetic Particles Spectrometer Science Investigation) is a particle telescope and a time-of-flight (TOF) spectrometer that measures ions and electrons over a broad range of energies and angles. Particle composition and energy spectra are measured for H to Fe from ~ 30 keV to ~1 MeV (but not all species are uniquely separated) and for electrons from ~30 keV to 700 keV. PEPSSI comprises a time-of-flight (TOF) section and a solid-state detector (SSD) array that measures particle energy. The combination of measured energy and TOF provides unique particle identification by mass and particle energy depending on the range: for protons from ~30 keV to ~1 MeV; for heavy (CNO) ions from ~80 keV to ~1 MeV. Lower-energy (>3 keV) ion fluxes are measured by TOF only, but without the SSD signal, providing velocity spectra at these energies as well. Due to storage and bandwidth limitations, all event data cannot be stored or telemetered to the ground. Instead, a round-robin algorithm is used to save Energy, TOF, and timing data for select events. The common data products contain these event and summary measurements, accumulated over fixed periods of 86,400 seconds, with each period in a single file comprising multiple binary tables. The documentation provided with this data set describes the data format. PEPSSI was powered on for most of the time frame during this mission phase, taking data in its low rate mode. Other than normal operations one EEPROM check was performed. Labels were redesigned during migration using the .FIT header and PDS3 .LBL files, but the data files are unchanged from their PDS3 version.