New Horizons Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI) Post-Launch Checkout Calibrated Data, Version 1.0

This data set contains Calibrated data taken by the New Horizons Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI) instrument during the LAUNCH mission phase. These data were migrated from the PDS3 dataset: NH-X-PEPSSI-3-LAUNCH-V1.1. PEPSSI 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. During the Post-Launch phase of the mission, the PEPSSI measurements concentrated on initial commissioning of the instrument. The first PEPSSI commissioning activity was running the full CPT on PEPSSI to confirm all instrument functionality after launch. Then commands were sent to open the door, ramp up bias voltage and HV and confirm full functionality. The remainder of commissioning activities included calibrating the instrument thresholds, determining HV settings, loading classification tables and initialization macros, and investigating and confirming the instrument pointing. There were a few days of data collection in which protons and helium are clearly identified. This phase includes periods in which the instrument is in normal science mode and diagnostic mode. The data taken during this period are not intended for scientific study. Labels were redesigned during migration using the .FIT header and PDS3 .LBL files, but the data files are unchanged from their PDS3 version.