1. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 1 Some Introductory Remarks Some Experimental Details Concerning EDDA Deuteron Polarimetry with EDDA Deuteron Polarimetry with ANKE Summary

2. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 2 Spin½ + Spin½ Observables Number of Spin½ + Spin½ Observables - unpol. - pol. 256 128 36 25 3 Example: Naiv + P + T Pauli (N-N) (p-p) (e-N)    M = f(a 1    a 6 ) M = f(a 1    a 5 )

3. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 3 Some Experimental Details Bistricky et al, J. de Phys. 39 25 Observables for Identical Particles (Spin 1/2 + Spin 1/2 )

4. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 4 Polarized Deuterons are interesting for several reasons: Measure spin observables and learn more about N-N forces. But:Deuteron break-up imposes additional difficulty. Use polarized deuterons via quasielastic scattering to do physics (infinitive momentum frame). But: Results may be affected by the presence of the proton (FSI,... ) Test of discrete symmetries (P, T,....) Reasons for Polarized Deuteron Physics

5. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 5 EDDA & ANKE @ COSY

6. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 6 The EDDA Detector Collaboration from: University Bonn (J. Bisplinghoff) University Hamburg (W. Scobel) FZ-Jülich (R. Maier)

7. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 7 Fiber Target: L ≈ 5∙10 29 /(cm 2 s) Tolerate up to N p = 2 ∙ 10 8 stored protons (CH 2, C sturdier). ABT: Density ρ F = 2 ∙ 10 11 /cm 2 L = ρνN p with ν = 1.5MHz  L = 3 ∙ 10 27 /(cm 2 s) for N p = 10 10 protons. Rates and LuminositiesDetectable Particles Rates and Luminosities Minimum energy needed to reach the EDDA ring layer: (Scaler mode)

8. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 8 pd Elastic Scattering

9. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 9  Count-Rates

10. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 10 Algorithm

11. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 11 ! pure states ! favorable transition combination 0 1 1 1 0 0 1 0 0 1 2 3 4 5 6 7 eps Deuteron Beam Polarizations

12. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 12 EDDA Set-Up as an Efficient Polarimeter Vector- and tensoranalysingpowers were calculated from the 4 quadrants (L, R, T, B) with relative specific efficiencies (eps); eps_L was set to be 1.

13. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 13 Quasielastic Scattering The tensor analyzing powers are 0 within the errors – as expected. There is a sizable vector analyzing power at 800 MeV.

14. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 14 Comparison of the P Vector Measured at the LEP and EDDA

15. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 15 Determining the Analyzing Power for EDDA @ 1850MeV/c Phys. Rev. C65 (2002) 34003 Phys. Rev. C36 (1987) 2010 Remarks: i)SPIN@COSY measures at 1850 MeV/c ii)ANKE measures at 2400 MeV/c

16. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 16 EDDA & ANKE @ COSY

17. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 17 The ANKE Detector

18. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 18 Calibration of the ANKE Polarimeter 1. 2. Results: No losses in polarization during acceleration Phys. Rev. ST Accel. Beams (2006) 9

19. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 19 Polarimeter Comparison Proportionality factors with respect to the maximally possible vector- (α z ) and tensorpolarizations (α zz ).

20. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 20 Polarization Export Technique

21. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 21 Summary ANKE can identify polarized neutrons. EDDA & ANKE could be „calibrated“ against the LEP. EDDA & ANKE could be calibrated absolutely. EDDA was tuned to become an efficient polarimeter. Deuteron polarimetry works at EDDA & ANKE.

22. Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 2007 22 The Principle of an Time Reversal Invariance Test