Villa Mondragone, 30 Settembre 2008 WiZard PAMELA Commissione INFN II Piergiorgio Picozza Villa Mondragone, 30 Settembre 2008
Stato del Satellite Approvato il prolungamento fino al 31 Dicembre 2009 Iniziate le procedure per un prolungamento per un ulteriore triennio
Pamela as a Space Observatory at 1AU Search for dark matter annihilation Search for antihelium (primordial antimatter) Search for new Matter in the Universe (Strangelets?) Study of cosmic-ray propagation Study of solar physics and solar modulation Study of terrestrial magnetosphere Study of high energy electron spectrum (local sources?)
PAMELA Status ~630 giorni di presa dati (~73% live-time) ~10 TByte of raw data trasmessi >109 triggers ottenuti e sotto analisi Gravi ritardi nell’analisi dovuti ad una situazione di mezzi di calcolo ancora troppo deficitaria
Antiprotoni
Alignment Incoherent misalignment Correction with protons 2 steps: column alignment + inter-column alignment Coherent misalignment Correction with electrons (or electrons + positrons) and comparison with simulation
PAMELA Protons Spillover
Antiproton-Proton Ratio PAMELA Preliminary
Antiproton to proton ratio Preliminary
Antiproton to proton ratio Preliminary
Positroni
Flight data: 42 GeV/c electron Mirko Boezio, IDM2008, 2008/08/20
Flight data: 92 GeV/c positron
Flight data: 36 GeV/c interacting proton Mirko Boezio, IDM2008, 2008/08/20 Mirko Boezio, IDM2008, 2008/08/20
Positron selection with calorimeter Rigidity: 20-30 GV e- p (non-int) p (int) Total negative 3067 Total positive 189055 Selected electrons 2032 Selected positrons 322 p (non-int) e+ p (int) Preliminary Fraction of charge released along the calorimeter track (left, hit, right) Mirko Boezio, IDM2008, 2008/08/20 Mirko Boezio, IDM2008, 2008/08/20 15
Positron selection with calorimeter Rigidity: 20-30 GV e- e+ Total negative 3067 Total positive 189055 Selected electrons 2032 Selected positrons 322 p Preliminary Fraction of charge released along the calorimeter track (left, hit, right) + Energy-momentum match Starting point of shower Mirko Boezio, IDM2008, 2008/08/20 Mirko Boezio, IDM2008, 2008/08/20 16
Positron selection with calorimeter Rigidity: 20-30 GV e- e+ Total negative 3067 Total positive 189055 Selected electrons 2032 Selected positrons 322 p Preliminary Fraction of charge released along the calorimeter track (left, hit, right) + Energy-momentum match Starting point of shower Longitudinal profile Mirko Boezio, IDM2008, 2008/08/20 Mirko Boezio, IDM2008, 2008/08/20 17
Positron selection with calorimeter Fraction of charge released along the calorimeter track (left, hit, right) Flight data: rigidity: 20-30 GV Test beam data Momentum: 50GeV/c e- e- e- p e+ e+ p Mirko Boezio, IDM2008, 2008/08/20 Energy-momentum match Starting point of shower
Positron selection e- e+ p e- p e+ Rigidity: 20-30 GV Fraction of charge released along the calorimeter track (left, hit, right) Neutrons detected by ND e- e- p e+ e+ p Energy-momentum match Starting point of shower Mirko Boezio, IDM2008, 2008/08/20
Positron selection e- e- e+ e+ p p p p Rigidity: 10-15 GV Energy loss in silicon tracker detectors: Top: positive (mostly p) and negative events (mostly e-) Bottom: positive events identified as p and e+ by trasversal profile method p e- p e- p e+ p e+ Rigidity: 10-15 GV Rigidity: 15-20 GV Mirko Boezio, IDM2008, 2008/08/20 Mirko Boezio, IDM2008, 2008/08/20
e+ background estimation from data Rigidity: 20-30 GV Preliminary e- p e+ ‘presampler’ p Fraction of charge released along the calorimeter track (left, hit, right) + Energy-momentum match Starting point of shower Mirko Boezio, IDM2008, 2008/08/20 Mirko Boezio, IDM2008, 2008/08/20
e+ background estimation from data Rigidity: 6-8 GV Preliminary e- p e+ ‘presampler’ p Fraction of charge released along the calorimeter track (left, hit, right) + Energy-momentum match Starting point of shower Mirko Boezio, IDM2008, 2008/08/20 Mirko Boezio, IDM2008, 2008/08/20
Positron to Electron Fraction Preliminary!!! Charge sign dependent solar modulation End 2007: ~20 000 positrons total Mirko Boezio, IDM2008, 2008/08/20 Mirko Boezio, IDM2008, 2008/08/20
Positrons with HEAT
Challenges Background calculation Solar Modulation at low energies Charge-sign dependence of solar modulation
Flux (p/cm^2 sr s) Kinetic Energy (GeV) Proton flux July 2006
Galactic H and He spectra Preliminary !!!
Solar Modulation of galactic cosmic rays BESS Caprice / Mass /TS93 AMS-01 Pamela Continuous monitoring of solar activity Study of charge sign dependent effects Asaoka Y. et al. 2002, Phys. Rev. Lett. 88, 051101), Bieber, J.W., et al. Physi-cal Review Letters, 84, 674, 1999. J. Clem et al. 30th ICRC 2007
Solar modulation Preliminary!! Increasing GCR flux solar activity Interstellar spectrum Preliminary!! (statistical errors only) Increasing GCR flux July 2006 August 2007 February 2008 solar activity Decreasing sun-spot number Ground neutron monitor PAMELA 35
Charge dependent solar modulation Preliminary!! ¯ + ¯ +
Positron Fraction Preliminary Mirko Boezio, INFN Trieste - Fermilab, 2008/05/02
A > 0 Positive particles A < 0
Charge sign dependence of cosmic ray modulation. Two systematic deviations from reflection symmetry of the interplanetary magnetic field: 1) The Parker field has opposite magnetic polarity above and below the equator, but the spiral field lines themselves are mirror images of each other. This antisymmetry produces drift velocity fields that for positive particles converge on the heliospheric equator in the A+ state or diverge from it in A- state. Negatively charged particles behave in the opposite manner and the drift patterns interchange when the solar polarity diverge. 2) Systematic ordering of turbulent helicity can cause diffusion coefficients to depend directly on charge sign and polarity state. Bieber, J.W., et al. Phys. Rev. Letters, 84, 674, 1999.
Radiation Belts South Atlantic Anomaly Secondary production from CR interaction with atmosphere
Pamela maps at various altitudes PRELIMINARY !!!! Altitude scanning
Primary and Albedo (sub-cutoff measurements)
Sub-cutoff
Size of SAA for altitudes between 350-600km B<0.21Gs, L-shell <1.2 Latitude Altitudes changes from 350 to 600km Longitude
Proton spectrum in SAA, polar and equatorial regions
e+/e- ratio in the equatorial region (L<1.2, B>0.25)
Differential energy spectra of secondary electron and positron fluxes at the geomagnetic equator (L<1.2, B>0.25) Flux (a.u.) Fluxx
December 2006 Solar particle events Dec 13th largest CME since 2003, anomalous at sol min
December 13th 2006 event Preliminary!
December 14th 2006 event Preliminary! Magnetic Field Neutron Monitor X-ray P,e- December 14th 2006 event Magnetic Field Neutron Monitor X-ray P,e- Arrival of event of Dec 14th End of event of Dec 14th Decrease of primary spectrum Arrival of magnetic cloud from CME of Dec 13th Shock 1774km/s (gopalswamy, 2007) Decrease of Neutron Monitor Flux Low energy tail of Dec 13th event Solar Quiet spectrum Below galactic spectrum: Start of Forbush decrease Preliminary!
December 13th 2006 He differential spectrum Preliminary!
Conferenze da Ottobre 2007 Presentazioni fatte dalla collaborazione internazionale IEEE UCLA Dark Matter La Thuile Waseda Giappone Rencontre de Blois Vulcano COSPAR 2008 ICHEP SLAC Summer School IDM 2008 ISVHEC Parigi SIF CRIS TeV 2008 Texas Conf. (Dic.) + Conferenze Russe
Seminari Internazionali Harvard FermiLab Nikhef Aachen Parigi (APC, Univ. 7) Entro Novembre Penn State Maryland Karlsrhue Kiel Corneil Stanford Michigan Durham CERN
Riunioni generali di analisi Siegen Germania Firenze Bari Roma S. Pietroburgo Napoli Ottobre
Costi fissi ricorrenti 4 Gigabyte downlink aggiuntivo 60 Messi nel contratto INFN-RSA. Finanziamento annuale Commissione Turni tecnici russi a NTsOMZ 48 Assistenza NTsOMZ 50 Internet NtsOMZ MEPhI 40 Consumi presso NTsOMZ 25 Supporto GRID MEPhI 15 Totale --------------------------------------------- 238
Calcolo Potenziamento delle stazioni di calcolo locali. 137 k€ inventariabile
Costi ricorrenti Presenza a Mosca 21 .5 mesi 142.5 k€ Coordinamento estero Picozza 25 k€ Coordinamento estero Boezio 10 k€
Test GSI Missioni Estere 32 k€ Trasporto 6 k€ Materiale 5 k€ Totale 43 k€
Riunioni di analisi riunioni di collaborazione: 3 in Italia 57.5 3 estere 112.5 Riunione gruppi analisi: 104 Coordinamento Picozza 12 interno Boezio 3 interno