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Towards the production of an anti-hydrogen beam

1/25. Towards the production of an anti-hydrogen beam.

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Towards the production of an anti-hydrogen beam

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  1. 1/25 Towards the production of an anti-hydrogen beam Simon Van Gorp1, Y.Enomoto1, N.Kuroda2, K.Michishio3, D.J.Murtagh1, S.Ulmer1,, H. Higaki, C.H.Kim2, Y.Nagata1, Y.Kanai1, H.A.Torii2, M.Corradini4, M.Leali4, E.Lodi-Rizzini4, V.Mascagna4, L.Venturelli4, N.Zurlo4, K.Fujii2, M.Otsuka2, K.Tanaka2, H.Imao5,Y.Nagashima3, Y.Matsuda2, B.Juhász6, A.Mohri1 and Y.Yamazaki1,2 (ASACUSA-MUSASHI) Graduate School of Advanced Sciences of Matter, Hiroshima University, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8530, Japan 1 RIKEN Advanced Science Institute, Hirosawa, Wako, Saitama 351-0198, Japan 2 Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Meguro, Tokyo 153-8902, Japan 3 Department of Physics, Tokyo University of Science, Kagurazaka, Shinjuku, Tokyo 162-8601, Japan 4 Dipartimento di Chimica e Fisica per l’Ingegneria e per i Materiali, Universitá di Brescia & Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Brescia, 25133 Brescia, Italy 5 RIKEN Nishina Center for Accelerator Based Science, Hirosawa, Wako, Saitama 351-0198, Japan 6 Stefan Meyer Institute for Subatomic Physics, Austrian Academy of Sciences, 1090 Wien, Austria

  2. *Antihydrogenis the simplest atom consisting entirely of antimatter. *Hydrogen counterpart is one of the best understood and most precisely measured atoms in physics. *A comparison of antihydrogen and hydrogen offers one of the most sensitive tests of CPT symmetry. Why Antihydrogen ? If there is some asymmetry we may get aware of it comparing mirrored systems which are fully understood.

  3. GOAL • High precision spectroscopy of the ground state hyperfine splitting of antihydrogen. HOW? • Rabi spectroscopy of a spin-polarized anti-atomic beam.

  4. 4/25 Low energy anti-hydrogen atoms (Level diagram) (F,M)=(1,-1) High Field Seekers (F,M)=(1,0) (F,M)=(1,1) Low Field Seekers (F,M)=(0,0) experiments performed with hydrogen atoms under field free conditions

  5. 3/25 Low energy anti-hydrogen atoms • EXTRACTION OF A POLARIZED BEAM • Anti Helmholtz configuration: • HFS-states: de-focused • LFS-states: focused [1] A. Mohri and Y. Yamazaki, Europhys. Lett. 63 (2003) 207. [2] Y. Enomoto et al., Phys.Rev.Lett.105 (2010) 243401.

  6. 9/25 Low energy anti-proton beams (AD to RFQD) ASACUSA extraction line Production target 3.5GeV/c ~5x 107 pbar stochastic cooling 2 GeV/c stochastic cooling 300MeV/c stochastic cooling & e-coolling 100MeV/c(~5MeV) stochastic cooling & e-coolling ~ 107 pbar pulse from AD (~100s cycle) 100keV <5 x 106 pbar with RFQD RFQD

  7. 14/25 How to produce ASACUSA-MUSASHI experimental setup We need antihydrogen → has to be synthesized first • MUSASHI trap – pbar accumulator • Positron accumulator • CUSP trap • Spin flip cavity • Sextupole Magnet • Detectors

  8. In Reality Antiprotons from AD RFQD decelerator (200 MHz, 1.1 MW, 0.5 ms) MUSASHI CUSP e+

  9. 20/25 Status of the new e+ source e+ source 1.85 Gbq (<100 keV) e+ trap 106/15s (<3 keV) B = 0.3 T Ne moderator 2.3 106/s (<3 keV) 5 x 105pbar (< 20 eV) Cusp trap B = 2.5 T B = 2.7 T

  10. Detection of Antihydrogen • Neutral antihydrogen escapes from trap • Apply field ionization well → strip positron, catch pbar. • Release field ionization well • Result after release • No peak without positrons • Clear indication for production of antihydrogen. • Downstream detector: hbar candidate signals detected.

  11. 19/25 201 Direct Injection ( of p) scheme Cusp trap ~ 150eV e+ pulse ~ 150eV pulse 6 6 x 10 e+/ 60 shot, ~0.01eV H produced !

  12. Potential How to improve on the F.I. signal ?  A.R. • Axial Frequency Scaling Exciting the particles as by a swept rf with a certain stop frequency: Definition of interaction energy

  13. Insert slide AR +Figuur Kuroda-san.

  14. Prepare 40 million positrons in the nested Inject directly from MUSASHI trap Apply RF during interaction RF Assisted Direct Injection Frequency Scaling in Nested Well Produced encouraging results – further evaluation in progress

  15. 12/25 Low energy antiproton beam (Tank circuit signal) [11] X.Feng, M.Charlton, M.Holtzscheiter, et al., J. Appl. Phys.79, 8 (1996)

  16. 13/25 How to produce (Low energy antiproton beam) Tank circuit signal with 3AD shot accumulated in MUSASHI (d)

  17. Summary • Production of antihydrogen demonstrated. • Candidate signals for extracted hbar at downstream detector. • Applying Continuous rfincread the Hbar formation rate by ~factor 4. • Major step towards first antihydrogen hyperfine spectroscopy. • Analysis of 2012 data is ongoing and results will be presented soon !

  18. Thank you for your attention Antiproton trap Positron trap CUSP trap Hbar detector CUSP detectors SMI cavity +sextupole + hodoscope The chief

  19. Backup slides

  20. Spectroscopy • 1.420 405 751 766 7(9) GHz • Correction: QED and proton/antiproton structure – level 10-6. • Together with high precision proton g-factor measurement: constraints on antiproton structure • We aim at 10-6 or better.

  21. Far Future ! Proposals to measure more precisely

  22. 18/25 How to produce Specifications positron 22 27mCi Na (<100keV, ~109 /s) W moderator, N2buffer gas (<3 eV, ~106 /s) Pre-accumulator (130eV, 2 x 105 /30s) CUSP trap antiproton (pbar) 6 x 10 positron (<0.1eV, ne+~108cm-3) 6 7 CERN PS (3.5GeV/c, 5 x 10 ) AD (5MeV, 10 ) RFQD (100keV, 5 x 10 ) MUSASHI (150eV, 5 x 10 ) 7 6 5 3 x 10 pbar (< 20 eV) 5

  23. 9/25 Low energy anti-proton beams (AD to RFQD) ASACUSA extraction line Production target 3.5GeV/c ~5x 107 pbar stochastic cooling 2 GeV/c stochastic cooling 300MeV/c stochastic cooling & e-coolling 100MeV/c(~5MeV) stochastic cooling & e-coolling ~ 107 pbar pulse from AD (~100s cycle) 100keV <5 x 106 pbar with RFQD RFQD

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