Measurement of the Vector and Tensor Polarisation of Proton and Deuteron   Beams
  Measurement of the d + d -> 4He + eta reaction using vector and tensor polarised beam has been performed at COSY using Big Karl magnetic spectrograph. The beam polarisation necessary for obtaining the vector and tensor analysing power for this reaction was measured. The method and the results of the tensor polarisation measurement of the deuteron beam are presented. 
The GEM Collaboration: M.Lesiak, M.Abdel-Bary, A.Budzanowski,   A.Chatterjee, J.Ernst, R.Gebel, P.Hawranek, R.Jahn, V.Jha, K...