• C. Eckardt, T. Bahlo, P. Bangert, R. Barday, U. Bonnes, M. Brunken, R. Eichhorn, J. Enders, M. Platz, Y. Poltoratska, M. Roth, F. Schneider, M. Wagner, A. Weber, B. Zwicker
  TU Darmstadt, Darmstadt
• W. Ackermann, W.F.O. Müller, T. Weiland
  TEMF, TU Darmstadt, Darmstadt

At the su­per­con­duct­ing 130 MeV Darm­stadt elec­tron linac S-DALINAC* a source of po­lar­ized elec­trons** is being in­stalled, ex­tend­ing the ex­per­i­men­tal ca­pa­bil­i­ties with po­lar­ized elec­tron and po­lar­ized pho­ton probes for nu­cle­ar struc­ture stud­ies. This in­volves dis­as­sem­bling the ex­ist­ing low en­er­gy test stand and re­build­ing the beam line in the ac­cel­er­a­tor hall. The beam it­self is pro­duced from a GaAs cath­ode by ir­ra­di­a­tion with a pulsed laser. The low-en­er­gy elec­tron beam line in­cludes di­ag­nos­tic el­e­ments, a Wien fil­ter for spin ma­nip­u­la­tion, a 100 keV Mott po­larime­ter for po­lar­iza­tion mea­sure­ment and a chop­per-pre­bunch­er sec­tion to mod­u­late the time struc­ture of the beam. At high­er en­er­gies a 5-10 MeV Mott po­larime­ter and a 50-130 MeV Moeller po­larime­ter as well as a Comp­ton trans­mis­sion po­larime­ter will be in­stalled to mea­sure the beam po­lar­iza­tion after ac­cel­er­a­tion. The Mott po­larime­ter is work­ing with backscat­tered elec­trons under 165° scat­ter­ing angle while for the Moeller po­larime­ter a wide-an­gle (3°-15°) spec­trom­e­ter mag­net was de­signed. We re­port on the per­for­mance of the test stand, the on­go­ing im­ple­men­ta­tion, and the po­larime­ter re­search and de­vel­op­ment.

* A. Richter, Proc. EPAC 96, Sitges, p.110.
** Y. Poltoratska et al., AIP Conference Proc. 1149 (2009), p.983.