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

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

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

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

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

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

Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP 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 ∙ /cm 2 L = ρνN p with ν = 1.5MHz  L = 3 ∙ /(cm 2 s) for N p = protons. Rates and LuminositiesDetectable Particles Rates and Luminosities Minimum energy needed to reach the EDDA ring layer: (Scaler mode)

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

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

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

Deuteron Polarimetry at COSY September 13, 2007 D.Eversheim, PSTP ! pure states ! favorable transition combination eps Deuteron Beam Polarizations

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

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

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

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

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

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

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

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

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

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

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