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The Polarized Internal Gas Target of ANKE at COSY

The Polarized Internal Gas Target of ANKE at COSY. Ralf Engels Institute for Nuclear Physics (IKP) Forschungszentrum Jülich. PST 05 Tokyo, Japan November 16, 200 5. COSY  COoler SYnchrotron. COSY: storage ring for (un-) polarized proton and deuteron beams

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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 Ralf Engels Institute for Nuclear Physics (IKP) Forschungszentrum Jülich PST 05 Tokyo, Japan November 16, 2005

  2. COSY  COoler SYnchrotron • COSY: • storage ring for (un-) polarized proton • anddeuteron beams • with momentum up to 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) Ralf Engels @ PST 05

  3. PIT setup • Polarized internal gas target setup • at the laboratory consist of: • Atomic Beam Source • Test chamber with storage • cell prototype • Lamb-Shift Polarimeter Setup at the laboratory Ralf Engels @ PST 05

  4. Atomic Beam Source H beam intensity ~ 8.0x1016 at/s Ralf Engels @ PST 05

  5. ABS beam profile σ = 2.85 ± 0.42 mm Ralf Engels @ PST 05

  6. Lamb-Shift Polarimeter layout Ralf Engels @ PST 05

  7. ABS beam polarization measurements Ly-α spectra of hydrogen and deuterium measured with LSP Ralf Engels @ PST 05

  8. How to measure polarization in the cell ABS beam  Target gas sample COSY beam Layout of the test setup at laboratory Ralf Engels @ PST 05

  9. LSP results Ralf Engels @ PST 05

  10. LSP results Ralf Engels @ PST 05

  11. How to measure polarization Ralf Engels @ PST 05

  12. PIT at COSY hall Ralf Engels @ PST 05

  13. PIT transportation Ralf Engels @ PST 05

  14. PIT @ ANKE Ralf Engels @ PST 05

  15. Polarized internal gas target setup at ANKE PIT @ 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 Ralf Engels @ PST 05

  16. 90 G 150 G 135 G 40 G 26 G 300 G 30 G 33 G 55 G 30 G 25 G 55 G 200 G 550 G 300 G 150 G 48 G 6 G 15 G 30 G 30 G 17 G y 60 G 100 G 300 G x z y z x 30 G - measured field without shielding 17 G - measured field with shielding 30 G - maximum calculated field magnitude 45 G - measured field magnitude 55 G - allowed field for device Stray field measurements Ralf Engels @ PST 05

  17. Polarization test with D2 field Pz ~ 0.80 Ralf Engels @ PST 05

  18. Vacuum chamber Frame with apertures XY-table COSY beam Apertures tests at COSY Ralf Engels @ PST 05

  19. Distance 2 Beam intensity is maximum Beam intensity starts to decrease Beam intensity starts to 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 Distance 2 Distance 3 Ralf Engels @ PST 05

  20. Estimated COSY-beam profile 36x16 mm9x12 mm 16x15 mm with cluster target (density ~ 1014 at/cm2) no target at injection with an accelerated beam Ralf Engels @ PST 05

  21. Cell test preparation Aperture→ 40 x 25 mm Big cell → 30 x 20 x 220 mm entrance 600 mm2 Small cell → 15 x 15 x 220 mm entrance 225 mm2 Ralf Engels @ PST 05

  22. Results of the cell test Tests were carried out with unpolarized hydrogen gas flux ~ 10-3 mbar l/s Target density for the large cell Ratio target/background for the large cell 9.4 * 1013 ~ 3 – 4 PRELIMINARY Injected deuterons large/small cell Estimated target density H2 for the small cell ~3 * 1014 ~ 7 – 8 No cooling of the ion beam !!! Ralf Engels @ PST 05

  23. Summary • PIT moved to COSY hall since December 2004 • PIT installed at ANKE in June-July 2005 • PIT is running since September 2005 • Cell tests without cooling in Spring 2005 • Cell tests with electron cooling shifted to November 2005 • LSP will be used to measure direct beam of the ABS • Polarization in the cells determined by the Spectator counters Ralf Engels @ PST 05

  24. Outlook November ’05 – next cell tests with cooling and stacking of the COSY beam November ’05 – commissioning of the ABS-jet target at COSY Winter ’05-’06 – ANKE target exchange from PIT to Cluster target May ’06 – one more week for cell test at COSY Until June ‘06 – more tests with LSP in COSY hall new cell production with teflon coating ISTC project 1861 : “Measurement of the nuclear polarization in H2 / D2 molecules” Summer ’06 – PIT reinstallation at ANKE Autumn ’06 – first data production with jet target at ANKE (http://www.fz-juelich.de/ikp/anke/en/proposals.shtml) Polarized fusion Ralf Engels @ PST 05

  25. ISTC project 1861 Ralf Engels @ PST 05

  26. Polarized fusion Ralf Engels @ PST 05

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