crater data products & production pipeline

Cosmic RAy Telescope for the Effects of Radiation

CRaTER Data Products&

Production Pipeline

Larry KepkoBoston University Center for Space Physics

CRaTER PDR


Calibrationo By exposing the detectors to beams of known

energies, we can determine the response.C

urr

en

t Fr

om

D

ete

ctor

Energy of Incident Particle


Calibrationo We will calibrate the detectors at 3 different

beam facilities, each with different energy ranges and species.• Timetable TBD

o Spot-checking


Calibrationo 88” Cyclotron, Lawrence Berkeley National

Laboratory

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


Calibrationo NASA Space Radiation Laboratory at

Brookhaven National Laboratory


Booster up to 1 GeV H

Booster up to 1 GeV/nucleon Fe


Calibrationo Indiana University


IUCF 30 - 200 MeV H


CRaTER Data Products

Description

Level 0 Unprocessed instrument data (pulse height at each detector), secondary science (discarded events), housekeeping.

Level 1Science data depacketed, 1-s resolution. Ancillary data pulled in (spacecraft attitude, calibration files, etc)

Level 2Pulse heights converted into energy deposited in each detector. Calculation of Si LET spectra.

Level 3 Separate out magnetotail, foreshock and ‘GCR’ data.

Level 4Calculation of TEP LET, incident energies and particle flux. Pull in GCR data from other spacecraft (e.g. ACE).


Level 0

To Level 1 Processing

LRO MOC

Housekeeping

Primary/secondary

science

sFTPCRaTER SOC

ValidationPDS L0 Archive


Level 0 Data Products

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 1


LRO MOC

Calibration Files

Orbit & AttitudesFTP

Depacket, create 1-s data

PDS L1 Archive

CRaTER SOC



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 2


Convert to energy

deposited

PDS L2 Archive

Calculate Si LET

Events of Interest

QL Plots



Level 2 Science

Energy deposited in each detector and LET.

QL Plots TBD

Events of Interest

e.g., SEP events.


Level 3


Region Separation

GCR

Foreshock

Magnetotail

SEP Events



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 SEPData containing SEP events (definition TBD) are separated as well


Level 4

Calculate LET in TEP

Modeling Community

?

Calculate Particle Flux

GCR Spectrum


Timetableso Level 2 data produced immediately upon

verification of Level 1 data.• Only involves application of pre-flight calibration curves and

simple LET calculations.

o GCR LET spectrum requires time• The longer the better• Probably something useful after 3-6 months


Back-up Slides


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

LET in the TEP requires E0 and Ef

E0

Ef

crater data products & production pipeline

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