Le misure di eleroni e positroni in AMS e la loro ... · Le misure di eleroni e positroni in AMS e la loro interpretazione ... Electrons by transition radiation and Nuclei by dE/dX

Lemisurediele+roniepositroniinAMSelalorointerpretazione

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16 Paesi 60 Istituti 500 ingegneri ricercatori e tecnici

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UNAM

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FINLAND

HELSINKI UNIV. UNIV. OF TURKU

FRANCEGAM MONTPELLIER LAPP ANNECY LPSC GRENOBLE

GERMANYRWTH-I RWTH-III MAX-PLANK INST. UNIV. OF KARLSRUHE

ITALYASI CARSO TRIESTE IROE FLORENCE INFN & UNIV. OF BOLOGNA INFN & UNIV. OF MILANO INFN & UNIV. OF PERUGIA INFN & UNIV. OF PISA INFN & UNIV. OF ROMA INFN & UNIV. OF SIENA

NETHERLANDSESA-ESTEC NIKHEF NLR

ROMANIAISS UNIV. OF BUCHAREST

RUSSIAI.K.I. ITEP KURCHATOV INST. MOSCOW STATE UNIV.

SPAINCIEMAT - MADRID I.A.C. CANARIAS.

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CHINA BISEE (Beijing) IEE (Beijing) IHEP (Beijing) SJTU (Shanghai) SEU (Nanjing) SYSU (Guangzhou) SDU (Jinan)

KOREA

EWHA KYUNGPOOK NAT.UNIV.

Y96673-05_1Commitment

PORTUGAL

LAB. OF INSTRUM. LISBON

ACAD. SINICA (Taiwan) CSIST (Taiwan) NCU (Chung Li) NCKU (Tainan)

NCTU (Hsinchu) NSPO (Hsinchu)

TAIWAN

TRD

TOF

Trac

ker

TOFRICH

ECAL

1

2

7-8

3-4

9

5-6

TRD Identify e+, e-, Z

Silicon Tracker Z, P

ECAL E of e+, e-, γ

RICH Z, E

TOF Z, E

ParGclesandnucleiaredefinedbytheir

charge(Z)andenergy (E ~ P)

Z, P are measured independently by the Tracker, RICH, TOF and ECAL

AMS:ATeVprecision,mulGpurposespectrometer

Magnet ±Z

Dimensioni:5x4x3m3Massa:7500kgPotenza:2500WCanalidiele+ronica:300000Microprocessori:650Datarateaterra:10Mbit/sDuratadellamissione:10-18anniCampomagneGco:0.15TMagnetepermanente1200kgNd2Fe14B

Transition Radiation Detector (TRD):

identifies Positrons, Electrons by transition radiation and Nuclei by dE/dX

Totalweight:2008tAMSweight:7.5t

May 16, 2011, 08:56 AM

2,5 ore dopo il lancio, i primi a funzionare sono i controlli del TRD

Installazionecompletata5.15AMdel19/5/2011dalle9.35AMSèinmisura

FotoPOCCestoriacontrollo

24h/24 365 d/y ≈ 1200 days data taking ≈ 50x109 events

: –  Anti-nuclei: He, C, …

: –  annichilazione dei neutralini e+ , e± , p , …

: –  strangelets, …

–  SNR, Pulsars, PBH, …

•  Fenomeni inaspettati

AMS

χ+χ e+........e+/(e+

+e

- )

Tracker Entry

Tracker Exit

a) Minimal material in the TRD and TOF So that the detector does not become a source of e+.

b) A magnet separates TRD and ECAL so that e+ produced in TRD will be swept away and not enter ECAL In this way the rejection power of TRD and ECAL are independent

c) Matching momentum of 9 tracker planes with ECAL energy measurements

Positron identification + flux with p/e+ >106

TRD

TOF

Trac

ker

TOFRICH

ECAL

e+

e+

p

p 0.33

X0

Trac

ker T

otal

0.

50 X

0

rejection >102

rejection >104

TRD:

ECAL:

P

e+

P

e+

PRL110,141102(2013) 6.8Me++e-

e+/(e++e-) 2013

6.8Me++e-

e+/(e++e-)

10.9Me++e-

SpeLroe++e-

(accepted, in press November 8th)