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ANKE at COSY-Jülich (ANKE goes double-polarized)

ANKE at COSY-Jülich (ANKE goes double-polarized). Frank Rathmann Institut für Kernphysik Forschungszentrum Jülich. Physics accessible with the Polarized Internal Storage Cell Target at ANKE. ABS. pd (+ spectator protons) pn elastic scattering pd breakup dp charge exchange pp ppX

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ANKE at COSY-Jülich (ANKE goes double-polarized)

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  1. ANKE at COSY-Jülich(ANKE goes double-polarized) Frank Rathmann Institut für Kernphysik Forschungszentrum Jülich 5th Workshop on the Scientific Cooperation between German Research Centres and JINR

  2. Physics accessible with the Polarized Internal Storage Cell Target at ANKE ABS • pd (+ spectator protons) • pn elastic scattering • pd breakup • dp charge exchange • ppppX • pnpnX • EM spin transfer p+ep+e • polarized antiprotons for FAIR LSP

  3. Atomic Beam Source (a la HERMES) Atomic beam intensity ~ 7.5x1016 at/s

  4. Test Setup of PIT PIT installed at ANKE Atomic Beam Source Target Chamber Lamb-shift Polarimeter

  5. Atomic beam polarization from Lamb-Shift Polarimeter Ly-α spectra of hydrogen and deuterium atoms

  6. New Equipment: Spectator Detector • Features: • Three layers (double sided) • 1st: 60 m • 2nd: 300 m • 3rd: 5 mm • Ekin~2 MeV (60 MeV/c) • 800 Channels • Self-triggering • On-board electronics • UHV compatible • Large Acceptance • 10% per telescope • 30 mm from the beam

  7. Future Experiments: Parity of θ+ Pentaquark Double polarization fixes parity of θ+ free of any model! Spin-correlation coefficient Axx in pp θ++ neg. Parity +1 Axx 0 50 Q [MeV] C. Hanhart et al., PLB,590,(2004) -1 pos. Parity WASA-COSYwith a polarized jet target

  8. Single and Double Polarization Experiments • NN Interaction (pn) • pd Dynamics • Meson Production in pp and pn Collisions • Parity of Θ+ Pentaquark Conclusion PIT at ANKE pursue a strong spin physics program • FAIR offers unique oportunities for spin physics (PAX) • Expertise gathered at COSY essential for success at FAIR • Polarized Antiprotons • Measurement of Transversity distribution of the nucleon

  9. Apertures tests at COSY Vacuum camber Frame with apertures XY-table COSY beam

  10. Apertures tests at COSY to find cell dimensions w b a d d=w-(a+b) COSY-beam diameters accelerated beam at injection cluster target off cluster target on 36x16 mm2 9x12 mm2 16x15 mm2

  11. Target Polarimetry → → Deuteron beam polarimetry at ANKE well-understood: Diploma thesis D. Chiladze → → → → Momentum and angle accuracies (from simulation) for protons (about 1.15 GeV/c) and deuterons (about 2.3 GeV/c). Cluster target40 cm cell Δp/p [%] Δθ [deg.]Δp/p [%] Δθ[deg.] 1.0 0.151.6 0.36 dp elastic pp elastic more acurate data (SAID), dp reactions closer to the physics  use both for target polarization determination ANKE

  12. New Equipment: PIT + Spectator Telescope • PIT: Polarized Internal Target:: • ABS • Lamb-Shift Polarimeter • Storage Cell • Spectator: Silicon telescope array beam

  13. Discussed Issues

  14. Discussed Issues II

  15. Sequence of Actions • PIT Commissioning during 2005 • Experiments will proceed from high rate to low rate reactions • Some optimization of Luminosity can be expected by making narrower cell: • for now: L=1.6·106·1010·5·1013=8·1029 cm-2s-1 • Sequence of experiments will not necessarily follow physics priorities • Proposal Deadline: End of February 2005

  16. Present System at ANKE D1-D2 Section ANKE Differential Pumping Target Chamber (750x600x400 mm3) Storage Cell Frame movable Beam-Position Monitor Strip Target COSY Beam

  17. PIT presently assembled in LKW Hall Few crane movements to transport PIT to ANKE Pillars mimic D1 and D2 magnets Movable Platform

  18. y x y z x Commissioning: Stray field of D2 Magnet 60-90 G 135 G 35-45 G 300 G 30 G 55 G 30 G 55 G 200 G 300 G 5-6 G 30 G 50-60 G 300 G Field map cut at the storage cell center (COSY coordinate z = 0) 30 G - calculated field magnitude 55 G - permissible field of device

  19. ANKE Target Chamber and Beam Position Monitors Target chamber with strip and cluster target Beam Position Monitor during testing

  20. → → dp→(pp)1S0 n → → pd→psp(pn) → → pd →(pp)1S0 n The NN program at ANKE Future double polarized ANKE Experiments: • Charge-Exchange breakup • np Elastic scattering • Deuteron breakup Strategy: Begin commissioning of the Polarized Internal Target using high rate reactions that can be easily identified (e.g. CE).

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