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AMS the Anti-Matter Spectrometer

AMS the Anti-Matter Spectrometer. The past:  1999 The present: 2000 The future: 2001-2003 and beyond… STS-91 mission (June 1998) ISS 3 year mission (May 2003?). AMS in space. the first large magnetic spectrometer i.e. the first particle physics experiment and

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AMS the Anti-Matter Spectrometer

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  1. AMSthe Anti-Matter Spectrometer • The past:  1999 • The present: 2000 • The future: 2001-2003 and beyond… • STS-91 mission (June 1998) • ISS 3 year mission (May 2003?) Cartigny, 12-02-2000

  2. AMS in space the first large magnetic spectrometer i.e. the first particle physics experiment and the biggest silicon system to date Cartigny, 12-02-2000

  3. AMS Physics Goals (1) • Measurement of H, He,… C isotopes • better understanding of cosmic ray origin and propagation in the galaxy • Antiprotons and positrons • search for exotic sources • High energy photons (> 1 GeV) • complementary to satellite and ground telescopes Cartigny, 12-02-2000

  4. Antimatter discovery:antistars, primordial antimatterExplanation for antimatter domain formation? No antimatter found:explanation for antimatter disappearance?Strong CP-violation? AMS Physics Goals (2) Search for antimatter: primary goal of AMS, up to |Z| = 6 Antihelium could originate from primordial nucleosynthesis OR from antistars anticarbon could ONLY come from antistars Cartigny, 12-02-2000

  5. The AMS apparatus for the precursor flight (1) • Construction and test of detector elements • assembly, integration, system tests • space qualification : outgassing, vibrations • Permanent magnet • 1.2m diameter, 80cm height, 1.9 tons • 0.15 Tesla • blocks of Nd-Fe-B of high field strength Cartigny, 12-02-2000

  6. The AMS apparatus for the precursor flight (2) • Tracker • 4 inner planes and 2 outer planespartially equipped (~40%) • 57 modules of 11 to 15 double-sided DC silicon microstrip detectors (CSEM, Neuch.) • front-end Viking/High Dynamic Range4ms peaking time, 0.7 mW/ch • 365W allocated (out of 1 kW), 0.5 Mbit/s (out of 1), 5MHz ADC on ext. TDR Cartigny, 12-02-2000

  7. The AMS apparatus for the precursor flight (3) • Time-of-flight - 4 planes • trigger • particle velocity and absolute charge • Anticoincidence - 16 counters • background rejection (albedo) • Aerogel Threshold Cherenkov - 2 planes • 168 10x10cm2 7cm thick solid cells Cartigny, 12-02-2000

  8. The STS-91 Discovery missionJune 2-12, 1998 (1) • Transport • from ETH-Zurich to Kennedy Space Center • Final tests and integration • Installation on the Shuttle Discovery • More tests and software uploads…. • Launch • Switch on and first data downloads! Cartigny, 12-02-2000

  9. The STS-91 Discovery missionJune 2-12, 1998 (2) • Data Taking • Control from Johnson Space Center • Slow Rate • temperatures, currents • counter rates, voltages • High Rate • calibrations • full events (ehm…) Cartigny, 12-02-2000

  10. The STS-91 Discovery missionJune 2-12, 1998 (3) • Landing at KSC • Transport • back to ETH-Zurich • Beam tests (+ cosmic muons…) • GSI-Darmstadt • Helium, Carbon • Cern-Geneva • charge-1 particles Cartigny, 12-02-2000

  11. Physics from STS-91 • Search for antihelium • 2,86 million helium nuclei observed • rigidity: 1 to 140 GV • Search for antimatter • Cosmic ray proton spectra • from 0.1 to 200 GeV • Gamma ray search Cartigny, 12-02-2000

  12. Mechanical design support, cooling Construction of tracker modules (ladders) Tests, metrology and integration of modules Electronic design Analysis and simulations Silicon development Environmental studies Problem analysis from STS-91 Que fait Genève? (1) Cartigny, 12-02-2000

  13. Que fait Genève? (2) • full responsibility of tracker readout system • FE electronic hybrids production & test • development of module test system • PC card, power supply (temp) • one of the three production lines of tracker modules • module integration center Cartigny, 12-02-2000

  14. AMS on the International Space Station (1) • Precursor Flight final data analysis • near completion (2000) • RD for Phase II (1999-2001) • design finalisation and optimisation • superconducting magnet • new detectors • space qualification of single elements Cartigny, 12-02-2000

  15. AMS on the International Space Station (2) • 2nd construction phase • Assembly (2000-2002) • Full space qualification • long-term operation tests • Installation on the Space Station (2003) • 3 to 5 years of data taking • (if we get He refill…) • Lots of work and physics (and fun) ahead! Cartigny, 12-02-2000

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