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COSY Report

COSY Report. December 6, 2013 | Andreas Lehrach, RWTH Aachen and FZ Jülich. Content. Physics program (ANKE, PAX, TOF, WASA) Preparatory work for FAIR (HESR and PANDA, CBM, NUSTAR, …) Future plans ( EDM ). COSY Overview. Circumference: 183 m, max. beam momentum 3.7 GeV/c

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COSY Report

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  1. COSY Report December 6, 2013 | Andreas Lehrach, RWTH Aachen and FZ Jülich

  2. Content Physics program (ANKE, PAX, TOF, WASA) Preparatory work for FAIR (HESR and PANDA, CBM, NUSTAR, …) Future plans (EDM)

  3. COSY Overview Circumference: 183 m, max. beam momentum 3.7 GeV/c Polarized proton and deuteron beams Electron and stochastic cooling EDDA polarimeter WASA COSY ANKE TOF PAX … the machine for hadron spin physics

  4. Results from ANKE at COSY NN scattering at ANKE:pp elastic (Ay) Ayforpp elastic (ANKE) at 6 beam energies: Tp = 0.8, 1.6, 1.8, 2.0, 2.2, 2.4 ANKE exp., April 2013 (fast analysis, preliminary) Openable storage cell (luminosity factor 5 more) (i) p n  n p (spin observables) (ii) n p  {pp}s p- (Axz parameter) (iii) p p  K+ L p (CNN coefficient) Double-polarized experiments approved

  5. Results from WASA at COSY isovector Isospin decomposition of ABC resonance structurePhys. Lett. B 721 (2013) 229 → pure isoscalar effect If resonance in np system: → effect should be present in np scattering Most sensitive observable in np scattering: analyzing power Ay and its energy dependence near θCM ≈ 90° First result: corresponding signalat resonance position WASA isoscalar WASA → np → np θCM ≈ 90° isovector+isoscalar WASA Further analysis needed WASA SAID

  6. Results from COSY-TOF Separation of singlet and triplet scattering length

  7. Results from PAX at COSY Transverse polarization buildup of a stored beam by Spin-Filtering Experiment with COSY / schematic COSY Cycle / schematic Siberian Snake Spin- flipper Results Physics Letters B 718, 64 (2012) Preparation for longitudinal polarization build-up at COSY and PAX-at-CERN/AD

  8. HESR Layout at FAIR Main machine parameter Momentum range 1.5 to 15 GeV/c Circumference 575 m Magnetic bending power 50 Tm Dipole ramp 25 mT/s Acceleration rate 0.2 (GeV/c)/s Geometrical acceptances for βt = 2 m horizontal 4.9 mm mrad vertical 5.7 mm mrad Momentum acceptance ± 2.5×10-3 Jülich is leading lab for design and construction

  9. HESR Prototyping and Beam Physics Pellet Target e-Cooler Barrier Bucket Cavity Residual Gas Profile Monitor WASA 2 MeV e-Cooler (2013) Stochastic Cooling HESR accelerator component tests

  10. 2MeV Electron Cooler at COSY Built at BINP, joint commissioning by BINP and COSY teams, to be installed at HESR • Parameters demonstrated so far: • 300mA @ 109kV • 250mA @ 192kV • 20mA @ 315kV • Voltage up to 1.3MV (5bar SF6) Electron cooling achieved: for 200MeV Protons with e-beam up to 200mA @ 109kV Initial beam profile|Vert. after cooling|Hor. after cooling|Gaussianfits|108protons in the Ring

  11. Preparatory Work for FAIR Detectors CBM, PANDA CBM: Silicon Tracker Tests GEM Detector Tests RPC ToF-Detector Tests HADES: Diamond Detector Tests PANDA: Straw-tube Tests Micro-vertex Detector Tests (Disk DIRC Tests) „Preassembly“ of PANDA parts (TOF area)

  12. Electric Dipole Moments EDM: Permanent spatial separation of positive an negative charges Permanent EDMs violate parity P and time reversal symmetry T Assuming CPT to hold, combined symmetry CP violated as well. EDMs are candidates to solve mystery of matter-antimatter asymmetry

  13. EDMs – Ongoing / Planned P. Harris, K. Kirch … A huge worldwide effort

  14. Storage Ring EDM Project … watch for development of vertical polarization  EDM Challenges: Huge E-fields Shielding B-fields Spin coherence Beam position Polarimetry (...) Goal: 10-29 e cm JEDI Jülich ElectricDipole Moment Investigations ~ 100 members (Aachen, Dubna, Ferrara, Cornell, Jülich, Krakow, Michigan, St. Petersburg, Minsk, Novosibirsk, Stockholm, Tbilisi, . . . ) 10 PhD students

  15. R&D Work at COSY (preliminary) Prerequisites to get long SCT: Beam bunching Beam cooling Sextupole correction SCT  400s Envelop of 120 kHz spin precession Up-down asymmetry (~ horizontal polarization) as a function of time Precision of spin tune measurement: 10-8 per 4 seconds Averaged spin tune can be determined to 10-10in a single 100s cycle Measured spin tune versus time in cycle High-precision spin physics !

  16. EDM Prototyping and Spin Physics Electrostatic Deflector (2017) SQUID and Cavity BPMs (≥2014) Prototype Polarimeter (≥2015) RF ExB Spin Flipper (2014) EDM accelerator and detector component tests

  17. Zusammenfassung Summary and Outlook COSY has a strong physics program: spin physics and symmetries COSY is an ideal test machine for FAIR preparatory work: accelerator and detector components COSY is the ideal starting place for charged- particle EDMs and precision measurements: R&D work, first direct measurement and dedicated storage ring

  18. Future HESR Upgrade Options Polarized Proton-Antiprotons Collider 15 GeV/c – 3.5 GeV/c Spin Filtering Antiproton Polarizer (APR) Asymmetric Collider Polarized Electron-Nucleon Collider ENC Accelerator Working Group:

  19. Siberian Snake at COSY Installation at COSY in spring 2013 Superconducting 4.7 Tm solenoid is ordered. Overall length: 1 m Ramping time 30 s Spin dynamics and longitudinal polarized beams for experiments

  20. Limits for Electric Dipole Moments EDM searches - only upper limits up to now (in ecm): Huge efforts underway to improve limits / find EDMs An EDM can have different sources. To disentangle different sources of CP valuation, it is important to measure neutron and proton and deuteron, and light nuclei EDMs

  21. Timeline: Stepwiseapproachall-in-onemachineforJEDI

  22. RF ExB Spin Flipper B-Field: 560mm long coil out of 6mm copper tubes with 8 windings Integral B field on axis: 0.33Tmm. E-Field: stainless steel electrodes inside the vacuum chamber by 50 μm thin foil Field gradient: 0.1 MV/m Frequency range: 100 kHz to 2000 kHz. Commissioning and first beam tests in January 2014

  23. Precursor Experiments: ResonanceMethodwith „magic“ RF Wien filter Avoids coherent betatron oscillations of beam. Radial RF-E and vertical RF-B fields to observe spin rotation due to EDM. Approach pursued for a first direct measurement at COSY. Observable: Accumulation of vertical polarization during spin coherence time RF E(B)-field In-plane polarization stored d Polarimeter (dp elastic)

  24. COSY Overview WASA ANKE EDM PAX TOF … the machine for hadron spin physics

  25. Vorarbeiten für HESR Entwicklungen an COSY: Stochastischer Kühltank Barrier Bucket Kavität Elektronen- Kühler (2 MV) Budker-Institut (Novosibirsk) Tests 2011 Lieferung I/2012 Komponententests; COSY Hochenergie e-Kühler 1. Stufe für HESR

  26. Jülich Center for Hadron Physics High-Energy Storage Ring HESR at FAIR Circumference: 576 m, magnetic rigidity 50 Tm Antiproton and ion beams Electron and stochastic cooling Cooler Synchrotron COSY Circumference: 183 m, magnetic rigidity 12 Tm Polarized proton and deuteron beams Electron and stochastic cooling Cooperation with Universities: COSY Association of Networking Universities (CANU) COSY F&E program Jülich-Aachen Research Alliance (JARA-FAME) Physics lectures at Aachen, Bonn, Cologne, Bochum, Wupertal, … Student summer school with Univ. of Bonn, Gießen and Bochum Bachelor/Master and PhD theses

  27. Preparatory Work for FAIR Detectors COSY as test bench Pellet Target (WASA) Cluster Jet Target (ANKE) Pellet Target (Lab) Straw Det. (TOF) Straw Detektoren als zentraler PANDA-Tracker Komponententests an COSY (PANDA-Targets, Central Tracker)

  28. Neutron Electric Dipole Moment Neutron Adapted from: Nature, Vol 482 (2012) No EDM yet, only limits

  29. Storage Ring EDM Project Options: All-electric ring (proton, electron): only E-field All-in-one ring (proton, deuteron, 3He): E- and B-fields Requirements: Clockwise and counterclockwise beams Challenges: Huge E-fields Shielding B-fields Spin coherence Beam position Polarimetry (...) srEDM Collaboration - JEDI Collaboration Dedicated precision storage ring

  30. JEDI – Stepwise Approach EDM Sensitivity 10-29 e cm Dedicated SR First direct measurements for p, d First direct measurements for p, d Precursor expt. w/ COSY 10-24 e cm R&D, test measurements at COSY Time Now Time scale: R&D and Precursor experiment: < 5 years Dedicated storage ring: > 5 years

  31. Results from WASA at COSY Resonance structure with I(JP) = 0(3+) m = 2370 MeV, G = 70 MeV If a resonance in np system, then resonance effect also in np scattering: Phys.Rev.Lett.106, 242302 (2011) Qcm = 83 resonance in 3G3 Most sensitive observable in np scattering: Analyzing power Ay and its energy dependence near Qcm 90 resonance in 3D3 Further analysis needed !

  32. Rohrhälften (1.4301) mit 0,1 mm Wandstärke und Detektoren werden von speziell entwickelten Piezotischen bewegt.

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