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ISS-present statusISS-present status

Trent Martin

NASA AMS Project Manager

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Electron, positron, proton, antiproton, isotopes….

Milano 20 maggio 20023

AMS-02 layout: energy and type separation of particles

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Antimatter search on anti-He with a sensitivity 103 better than current limits

High statistics study of the cosmic ray spectrum Isotope separation Antiparticle spectrum

1 year

10Be is specially interesting for its half time (t1/2 = 1.51 106 years) of the same order than the confinement time of the CR in the Galaxy

After 3 years, AMS will collect ~105 10Be

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Dark Matter Search

INDIRECT DETECTION: in CRs

•signals due to χχ annihilation in the galactic halo

.                     → neutrinos

.                     → gamma-rays

.                     → antiprotons, positrons, antideuterons

ASTROPHYSICS OF COSMIC RAYS!!

CR Transport equationin Diffusion Models: in2D with turbolence convection, energy changing and sources in the halo

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Secondary antiprotons: background when looking for exotic component

To calculate secondary

antiproton fluxes:

.      → p and He in CR (measured flux)

.      → nuclear cross sections (data + Mcarlo)

.      → diffusion models

AMS-02 data

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From interstellar to Earth CR flux-1

)(1

)()(

3

1)sin(

sin

1)(

1 22

2

222

2VUr

rrTU

Tr

Vr

r

UK

rr

UKr

rrt

Urr

Diffusion (r) Diffusion (Diffusion (r) Diffusion () Adiabatic loss Convection) Adiabatic loss Convection

Fokker-Plank equation of propagation in 2 or 3D

0

20

40

60

80

100

0 20 40 60 80 100au

auHeliospheric boundary

Solar activity and polarity

Heliosphere (Solar)

MODULATION

+ DRIFT!

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From interstellar to Earth CR flux-2

Magnetosphere MODULATION

TF calculation AMS-02 predictions

Recontsruct CR trajectories: TF calculation

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Tesi di laurea breve disponibili

•Eliosfera •Modulazione solare da 1D a 2D•Moti di deriva nell’eliosfera•CR modulation per i pianeti del sistema solare (Marte etc.)•Modulazione nelle fasi A>0 e A<0

•Magnetosfera•TF per elio e confronto dati AMS01•TF per elettroni e confronto dati AMS01•TF 2009 e previsioni Elio AMS-02•TF per ioni (C-Fe) e previsioni AMS02•On-line running code