For the design of the International Linear Collider (ILC) a polarised positron source based on a helical undulator system has been proposed. In order to optimise the positron beam, i.e. to ensure high intensity as well as high degree of polarisation, a measurement of the polarisation close to the positron creation point is envisaged. In this contribution methods to determine the positron polari...

The HERMES experiment has studied for more than a decade deep-inelastic scattering of electrons/positrons from longitudinally and transversely polarised and also unpolarised atomic gas targets internal to the electron storage ring of HERA. The collected semi-inclusive data allowed to extract informations about various quark distribution and fragmentation functions. Examples presented in this co...

COMPASS, a new fixed target experiment at CERN, aimed at the study of nucleon spin structure and hadron spectroscopy, has started to collect physics data in Autumn 2001. This paper describes the COMPASS apparatus and the measurement of the gluon polarisation ∆G/G. The apparatus consists in a solid state polarised target and a two stage spectrometer with high resolution tracking, particle identi...

In the mainframe of the TESLA Technical Design Report a study of the polarised electron beam preaccelerator has been made. The bunching of electrons delivered by a polarised electron source is described and results of simulations are given. The acceleration of the beam with room temperature cavities and its transport to and through a superconducting linac up to 500 MeV is also studied. The pola...

New results on single spin asymmetries of charged hadrons produced in deep-inelastic scattering of muons on a transversely polarised LiD target are presented. The data were taken in the years 2002, 2003 and 2004 with the COMPASS spectrometer using the muon beam of the CERN SPS at 160 GeV/c. Preliminary results are given for the Sivers asymmetry and for all the three “quark polarimeters” present...

We propose a method for polarising antiprotons in a storage ring by means of a polarised positron beam moving parallel to the antiprotons. If the relative velocity is adjusted to v/c ≈ 0.001 the cross section for spin exchange is as large as 〈σPzz〉 ≈ 2 ·10 barn as shown by new QED-calculations. Two possibilities to provide a positron source with sufficient flux density are presented. A polarise...

We report on first-principles spin-polarised quantum transport calculations (from NEGF + DFT) in MgO-spaced magnetic tunnel junctions (MTJs) based two different Mn-based Heusler ferrimagnetic metals, namely Mn3Al and Mn3Ga their tetragonal DO22 phase. The former is a fully compensated half-metallic ferrimagnet, while the latter low-moment high-spin-polarisation both with small lattice mismatch ...