Sources for the Data Challenge Toby Burnett, Theodore Hierath, Sean Robinson SLAC Workshop 15 July 2003.

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Presentation transcript:

Sources for the Data Challenge Toby Burnett, Theodore Hierath, Sean Robinson SLAC Workshop 15 July 2003

T. Burnett Data Challenge/Science Tools Workshop 15 July 03 2 The background mixture from PDR ProtonsElectronsGammas Averagecremeavg albedo_proton_avg electronavg albedo_electronpositronavg_total albedo_gamma Maximumchimemax albedo_proton_max electronmax albedo_electronpositronmag_total albedo_gamma electronavg, electronmax: from scaled CHIME at representative lat,lon chimemax: CHIME at =-28.5,110 (empirical maximum) cremeavg: from a table of the “average” CRÈME spectrum albedo_gamma: narrow band at horizon albedo_electronpositronavg[avg,mag]_total: empirical broken power-law spectrum, eye-ball fit to AMS data—implemented as e+ only.

T. Burnett Data Challenge/Science Tools Workshop 15 July 03 3 Validation by David Wren Important changes since CDR –Gismo  Geant4 –FluxSvc code reorganization (“refactoring”) Careful comparison by David Wren: glast.slac.stanford.edu/software/A naGroup/wren_fluxes4.pdf Flux Type Integrated Flux (kHz/m^2) in GlastRelease/ Gleam Integrated Flux (kHz/m^2) in pdrApp backgndmaxpdr 9.9 chimemax4.2 albedo_proton_ max 2.6 albedo_gamma0.92 electronmax0.043 albedo_electron positron_total 2.2

T. Burnett Data Challenge/Science Tools Workshop 15 July 03 4 Deficiencies The albedo gamma has only the limb The electron albedo sources do not have dependence on geomagnetic latitude We need a full position-dependent source, since we will be simulating orbits (more later) albedo_gamma angular dependence

T. Burnett Data Challenge/Science Tools Workshop 15 July 03 5 The new CRflux package Primary author: Tsunefumi Mizuno Based on AMS data, evolved from balloon data (Palestine) Careful descriptions of proton, electron/positron, gamma fluxes Some flaws to be fixed, clear that lat/lon is correct CrGamma angular dependence CrProton angular dependence Fluxes (particles/m^2/sr/sec) SourcePalestineMinMax CrProton CrProtonPrimary CrProtonReentrant CrProtonSplash chime

T. Burnett Data Challenge/Science Tools Workshop 15 July 03 6 Orbits, rocking and all that Orbit Rocking Strategey Backgrounds Sources Event::Exposure double m_intrvalstart; /// mission elapsed time for start double m_lat, m_lon, m_alt; ///position of the LAT (degrees, km) double m_posX,m_posY,m_posZ; /// position (in inertial celestial cartesian coords) double m_RAX, m_DECX; /// direction of LAT x-axis double m_RAZ, m_DECZ; /// direction of LAT z-axis FluxSvc G4Generator Event::McParticleCol FluxAlg

T. Burnett Data Challenge/Science Tools Workshop 15 July 03 7 Some Issues Time as an event key: –Internal format : double (mission elapsed time, or two long ints)? –Mission start: let’s choose it. (JD ?) Launch date for the simulation Orbit model: plan to use Perugia’s astro::EarthOrbit Three stages: 1.Exposure database, 30 sec intervals 2.Incoming particles record 3.Full simulation Determine the random seed from the event key