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CRaTER Data Products & Production Pipeline. Larry Kepko Boston University Center for Space Physics CRaTER PDR. Calibration. By exposing the detectors to beams of known energies, we can determine the response. Current From Detector. Energy of Incident Particle. Calibration.
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CRaTER Data Products&Production Pipeline • Larry Kepko • Boston University Center for Space Physics • CRaTER PDR
Calibration • By exposing the detectors to beams of known energies, we can determine the response. Current From Detector Energy of Incident Particle
Calibration • We will calibrate the detectors at 3 different beam facilities, each with different energy ranges and species. • Timetable TBD • Spot-checking
Facility Beam Properties LIIF 9-55 MeV H 19 or 32.5 MeV/nucleon He to Ne HIIF 4.5 MeV/nucleon He to Bi 10 MeV/nucleon B to Xe 14.5-16 MeV/nucleon C to Xe Calibration • 88” Cyclotron, Lawrence Berkeley National Laboratory
Facility Beam Properties Booster up to 1 GeV H Booster up to 1 GeV/nucleon Fe Calibration • NASA Space Radiation Laboratory at Brookhaven National Laboratory
Facility Beam Properties IUCF 30 - 200 MeV H Calibration • Indiana University
Description Level 0 Unprocessed instrument data (pulse height at each detector), secondary science (discarded events), housekeeping. Level 1 Science data depacketed, 1-s resolution. Ancillary data pulled in (spacecraft attitude, calibration files, etc) Level 2 Pulse heights converted into energy deposited in each detector. Calculation of Si LET spectra. Level 3 Separate out magnetotail, foreshock and ‘GCR’ data. Level 4 Calculation of TEP LET, incident energies and particle flux. Pull in GCR data from other spacecraft (e.g. ACE). CRaTER Data Products
LRO MOC sFTP Primary/secondary science CRaTER SOC Housekeeping Validation To Level 1 Processing Level 0 PDS L0 Archive
Level 0 Science Unprocessed instrument data (pulse height at each detector), secondary science (discarded events, etc.). Up to 25 packets of up to 48 events per second Level 0 Housekeeping Bias voltage, temperature, etc., 16-s resolution Level 0 Data Products
Level 1 Depacket, create 1-s data LRO MOC sFTP Orbit & Attitude CRaTER SOC Calibration Files PDS L1 Archive To Level 2 Processing
Level 1 Science Unprocessed instrument data (pulse height at each detector), depacketed. Creation of 1-s data. Secondary science placed in 1-s data header. Level 1 Housekeeping Bias voltage, temperature, etc., 16-s resolution Level 1 Data Products
Calculate Si LET Level 2 Convert to energy deposited QL Plots Events of Interest PDS L2 Archive To Level 3 Processing
Level 2 Science Energy deposited in each detector and LET. QL Plots TBD Events of Interest e.g., SEP events. Level 2 Data Products
Level 3 Region Separation Magnetotail Foreshock GCR SEP Events To Level 4 Processing
L3 Region Data separated into 3 files (or, alternately, 1 file with a data flag) identifying what data was obtained while the moon was in the a) magnetosphere, b) foreshock and c) pure GCR L3 SEP Data containing SEP events (definition TBD) are separated as well Level 3 Data Products
Level 4 Calculate LET in TEP ? Modeling Community GCR Spectrum Calculate Particle Flux
Timetables • Level 2 data produced immediately upon verification of Level 1 data. • Only involves application of pre-flight calibration curves and simple LET calculations. • GCR LET spectrum requires time • The longer the better • Probably something useful after 3-6 months
LET Calculation Linear Energy Transfer (LET) is the energy deposition in matter per unit length
LET Calculation LET in the Silicon detectors can be calculated directly
LET Calculation E0 LET in the TEP requires E0 and Ef Ef
