Le misure di eleroni e positroni in AMS e la loro ... · Le misure di eleroni e positroni in AMS e...
Transcript of Le misure di eleroni e positroni in AMS e la loro ... · Le misure di eleroni e positroni in AMS e...
16 Paesi 60 Istituti 500 ingegneri ricercatori e tecnici
USAA&M FLORIDA UNIV. JOHNS HOPKINS UNIV. MIT - CAMBRIDGE NASA GODDARD SPACE FLIGHT CENTER NASA JOHNSON SPACE CENTER UNIV. OF MARYLAND-DEPRT OF PHYSICS UNIV. OF MARYLAND-E.W.S. S.CENTER YALE UNIV. - NEW HAVEN
MEXICO
UNAM
DENMARKUNIV. OF AARHUS
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.
SWITZERLANDETH-ZURICH UNIV. OF GENEVA
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
: – Anti-nuclei: He, C, …
: – annichilazione dei neutralini e+ , e± , p , …
: – strangelets, …
– SNR, Pulsars, PBH, …
• Fenomeni inaspettati
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+