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The Polarized Internal Gas Target of ANKE at COSY

The Polarized Internal Gas Target of ANKE at COSY. Kirill Grigoriev Institute for Nuclear Physics (IKP) Forschungszentrum, Jülich. 16 th International Spin Physics Symposium Trieste, Italy O ctober 15 , 2004. Outline. Introduction Atomic Beam Source Lamb-Shift P olarimeter

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The Polarized Internal Gas Target of ANKE at COSY

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  1. The Polarized Internal Gas Targetof ANKE at COSY Kirill Grigoriev Institute for Nuclear Physics (IKP) Forschungszentrum, Jülich 16th International Spin Physics Symposium Trieste, Italy October 15, 2004

  2. Outline • Introduction • Atomic Beam Source • Lamb-Shift Polarimeter • StorageCell prototypes • Apertures test at COSY • Outlook Kirill Grigoriev @ SPIN'04

  3. COSY  COoler SYnchrotron • COSY: • storage ring for polarized proton • anddeuteron beams • with momentum range 600 - 3700 MeV/c • COSY used for: • internal experiments - with the circulating • beam (ANKE, COSY-11, EDDA, PISA) • external experiments - with the extracted • beam (BIG KARL, JESSICA, NESSI, TOF) Kirill Grigoriev @ SPIN'04

  4. ANKE at COSY • Magnets • D2 – spectrometer magnet • D1, D3 – beam bending magnets • Detector systems • Positive & Negative • Forward & Backward • Spectator Detectors • Targets • Solid strip • Cluster • Polarized Spectrometer ANKE Kirill Grigoriev @ SPIN'04

  5. Polarized internal gas target setup at ANKE PIT at ANKE • Technical constraints • Installation time of the PIT is • limited to 3-4 days • D2 is movable → needs • sophisticated supporting • bridge between D1 and D2 • Tunnel width is limited • → 60° angle between LSP • components • ABS axis is 50 cm away from • D2 yoke → shielding from the • stray field is needed ABS Storage cell Polarimeter Kirill Grigoriev @ SPIN'04

  6. y x y Field map cut at the storage cell center (COSY coordinate z = 0) z x 30 G - calculated field magnitude 55 G - permissible field of device Stray field MAFIA calculation 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 Kirill Grigoriev @ SPIN'04

  7. Laboratory Setup • Setup at the laboratory consist of: • Atomic Beam Source • Test chamber with storage • cell prototype • Lamb-Shift Polarimeter Setup at the laboratory Kirill Grigoriev @ SPIN'04

  8. Atomic Beam Source Working principle H beam intensity ~ 8.0x1016 at/s Kirill Grigoriev @ SPIN'04

  9. Typical Ly-α spectrum Lamb-Shift Polarimeter Lamb-Shift Polarimeter layout Kirill Grigoriev @ SPIN'04

  10. ABS beam polarization measurements Ly-α spectra of hydrogen and deuterium measured with LSP Kirill Grigoriev @ SPIN'04

  11. Layout of the test setup at laboratory PIT test setup Kirill Grigoriev @ SPIN'04

  12. ABS beam profile at cell ABS beam beam extracted from cell beam extracted from cell ABS beam  COSY beam COSY beam Storage cell prototype Top view of beam profile on glass with molybdenum oxide Kirill Grigoriev @ SPIN'04

  13. ABS beam profile σ = 2.85 ± 0.42 Kirill Grigoriev @ SPIN'04

  14. Cell prototype ABS beam • ABS beam profile is known • Target gas sample profile can be simulated if shapes of all tubes are known • COSY beam profile should be analyzed Target gas sample COSY beam Beams directions at storage cell Kirill Grigoriev @ SPIN'04

  15. Vacuum camber Frame with apertures XY-table COSY beam Apertures tests at COSY Kirill Grigoriev @ SPIN'04

  16. Distance 2 Distance 3 Distance 2 Beam intensity is maximum Beam intensity start decrease Beam intensity start decrease Beam diameter = Aperture inner width - ( Distance 2 + Distance 3 ) Principle of the apertures tests at COSY 1. Beam in the center of the aperture 50 mm 2. Aperture moves to the right until intensity drops +5 mm 3. Aperture moves to the left until intensity drops 11 mm Kirill Grigoriev @ SPIN'04

  17. Apertures tests at COSY Tests with an accelerated beam Tests at injection Kirill Grigoriev @ SPIN'04

  18. Estimated COSY-beam profile 36x16 mm9x12 mm 16x15 mm cluster target on (density ~ 1014 at/s) at injection cluster target off with an accelerated beam Kirill Grigoriev @ SPIN'04

  19. Time schedule Before end 2004 – transfer of ABS and LSP to COSY hall Spring 2005 – cell prototype tests at ANKE with unpolarized storage cell target Summer 2005 – first installation of PIT at COSY, commissioningand initial research After all–ready for allkinds of experiments with Polarized Internal Gas Target !!! in progress… approved… to be scheduled… Kirill Grigoriev @ SPIN'04

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