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Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 1 How Everything Began The CBS for COSY Overcoming Depolarizing Resonances The.

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Presentation on theme: "Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 1 How Everything Began The CBS for COSY Overcoming Depolarizing Resonances The."— Presentation transcript:

1 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 1 How Everything Began The CBS for COSY Overcoming Depolarizing Resonances The EDDA Experiment The ABT for EDDA The RF Spin-Flipper The ANKE and TOF Experiment Summary

2 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 2 Solenoid (<4 Tesla) 1 st 6-Pole 2 nd 6-Pole IF WF 1.8 m Penning Ionizer Dissociator 6-Poles & Transitions The Bonn Source System with 8 electrostatic electrodes, magnetic and electrostatic mirror. Strongly coupled system with hysteresis Large potential depression Noisy System with compressor (2 nd ) 6-pole magnet and tapered (1st) 6-pole magnet. Transitions suffer from the stray-field of the solenoid Beam handling matched to cooled nozzle Polarization suboptimal Nozzle cooled to 77K

3 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 3 Ionizer Noise Penning Ionizer ECR Ionizer 0

4 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 4 Lessons to be Learned ! Avoid coupled systems ! Have the magnetic fields under control i.e.: strength, shape, and stability  Invest in sufficient measuring devices

5 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 5 The COSY Accelerator Facility at FZ-Jülich COSY was designed from the beginning to handle polarized.

6 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 6 The COSY Accelerator Facility at FZ-Jülich

7 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 7 The COSY CBS (1992-1995) Collaboration from universities: Bonn (D. Eversheim) Erlangen (W. Kretschmer) Cologne (H. Paetz gen. Schieck) →Talk by R. Gebel

8 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 8 The COSY CBS

9 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 9 Time [ms] CBS Gas Injection Scheme

10 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 10 Deuteron RF-Transitions # 1 2 3 4 5 Breit-Rabi Plot for Deuterons

11 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 11 !pure states !favorable transition combination Systematic Transition Scheme for Deuterons 6-Pole Magnets and RF-Transition (Tr.) Combinations

12 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 12 Targetmotor The Low-Energy (LE) Polarimeter Cyclotron-Beam University Krakau

13 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 13 LE-Polarimeter Spectra P y = 0.85 P x = 0

14 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 14 Resonance strength: 10 -6 - 10 -3 Q y = 3.60 Imperfection and Intrinsic Resonances for COSY

15 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 15 The EDDA Detector Collaboration from: University Bonn (J. Bisplinghoff) University Hamburg (W. Scobel) FZ-Jülich (R. Maier)

16 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 16 The EDDA Detector with the ABT

17 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 17  tune jumps  vertical orbit excitation Achieved: 10 10 protons with P > 75% at 3.3 GeV/c Tune-Jump Quadrupole Copper coil air core Length 0.6 m Max. current ±3100 A Max gradient 0.45 T/m Rise time 10 μs, Fall time 10 to 40 ms Methods at COSY to Preserve Polarization

18 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 18  G=4  G=5  G=6 7-Q y 0+Q y 8-Q y 1+Q y 9-Q y 2+Q y 10-Q y Polarization During Acceleration

19 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 19 The EDDA ABT (1996-1997) University Bonn (D.Eversheim)

20 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 20 EDDA ABT Beam Prediction: 02´95 QMS-measurement:01´97 EDDA:11´97 Areal density ρ F for one state : ρ F = 2  10 11 /cm 2

21 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 21 The Holding Field Assembly COSY-Beam ABT-Beam

22 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 22 The EDDA Target Cell

23 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 23 Calculation of the Holding-Field for the Target Cell Holding-field in y-direction generated by 24 current conductors at z = 0. Relative deviations from the mean-field shown at 0.1%, 0.2%, 0.5%, and 1%

24 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 24 90 Some EDDA Results for Scattering Excitation functions of A N at eight out of 15 c.m. angles in comparison to phase shift solutions pre EDDA post EDDA EDDA pp elastic data-base dσ/dΩ Eur. Phys. J. A23, (2005) 351

25 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 25 Numerical data access: http://kaa.desy.de/edda/EDDA.html Scientific Impact

26 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 26 The RF Spin-Flipper p=2.1 GeV/c Δt=0.1 s, Δf/2=6 kHz ∫B rms dl=0.46 T·mm Spin flipping of polarized protons RF Dipole 8-turn water-cooled copper coil in a ferrite box Length 0.6 m Frequency range 0.25 to 1.45 MHz Integrated field ∫B rms dl ~ 0.54 T·mm SPIN@COSY Collaboration University of Michigan (A. Krisch) FZ-Jülich (R. Maier) University Bonn (F. Hinterberger) Vector spin-flip efficiency 99.92 ± 0,04%

27 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 27 Spin-flipping of polarized deuterons Higher-order spin resonances p=2.1 GeV/c Spin-Flipping at COSY Spin-flip efficiency 97 ± 1% p=1.85 GeV/c Δf/2=100 Hz

28 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 28 COSY Lay-Out

29 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 29 The ANKE Spectrometer Top view of the ANKE spectrometer and detector system. The Forward Detector (FD) consists of three Multi- Wire Proportional Chambers (MWPC), labeled 3, 4 and 5, and a two layer scintillation hodoscope. Deuteron Beam Polarimetry Negative ejectiles Positive ejectiles D1 D2 D3 Scintillators Side hodos- cope FD TOF Stop TOF Start MWPC 3-5 MWPC 6,7 MWPC 1,2 MWPC 3,4 Scintillator hodoscop Telescope with TOF Stop, ΔE,... TOF Stop Polarized Internal Target Cerenkov detectors 1m →Talk by D. Eversheim

30 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 30 The ANKE ABT Dissociator 6-Pole Magnets Transitions →Talk by R. Engels

31 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 31 The Jülich TOF Spectrometer

32 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 32 Solid State Internal Polarized Target (planned) Schematic of the Jülich TOF Spectrometer

33 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 33 Mounting the Scintillator Wedges

34 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 34 Azimuthal Distribution of Spill-Averaged Polarization at TOF p Beam = 0.8 GeV/c

35 Polarization Facilities at COSY September 11, 2007 D.Eversheim, PSTP 2007 35 Summary COSY provides beams in its total energy range. Two atomic beam targets for (EDDA and ANKE) complete the experimental equipment. The EDDA experiment substantially extended the database for phaseshifts. RF spin-flipping works for. COSY is a nice place for spin physics.

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