Accelerator Physics LCRD 2.37

1
Accelerator Physics LCRD 2.37 Undulator Based
Production of Polarized Positrons for Linear
Colliders (SLAC Experiment E-166) S. Berridge,
W. Bugg, Y. Efremenko, T. Handler, Y. Kamychkov,
S.Spanier, University of Tennessee C. Lu,
K.T.McDonald. Princeton University
Concept Balakin and Mikhailichenko (1978)

• E-166 uses the 50 GeV FFTB beam in conjunction
• with a 1 m-long, helical undulator (? 2.4 mm,
  
• ID 0.9 mm) to make 10-MeV polarized photons.
• These photons are converted in a 0.5 rad. len.
  Thick
• target into e (and e-) with 50
  polarization.
• The polarization of the positrons and photons
  will
• be measured.
• E-166 scheduled to run in Oct. 2004.

Hardware Silicon calorimeters (U.Tennessee),
Aerogel Cerenkov, Positron
transport magnets (Princeton).