A polarized target for the CLAS detector

C. D. Keith, M. Anghinolfi, M. Battaglieri, P. Bosted, D. Branford, S. Bültmann, V. D. Burkert, S. A. Comer, D. G. Crabb, R. De Vita, G. Dodge, R. Fatemi, D. Kashy, S. E. Kuhn, Y. Prok, M. Ripani, M. L. Seely, M. Taiuti, S. Witherspoon

Research output: Contribution to journalArticlepeer-review

67 Scopus citations


We describe the design, construction, and performance of a polarized solid target for use in electron scattering experiments with the CEBAF Large Acceptance Spectrometer. Protons and deuterons are continuously polarized by microwave-induced spin-flip transitions at 1 K and 5 T. The target operated successfully during two cycles in 1998 and 2000, providing proton and deuteron polarizations as high as 96% and 46%, respectively. The unique features of the target which permit its use inside a 4π spectrometer are stressed. Comparison is made between the target polarization measured by the traditional method of NMR and by electron elastic scattering.

Original languageEnglish
Pages (from-to)327-339
Number of pages13
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number2-3
StatePublished - Apr 1 2003

Bibliographical note

Funding Information:
The authors gratefully acknowledge the expert support provided by the technical staffs of the Jefferson Lab Target Group, Jefferson Lab Hall B, University of Virginia Physics Department, and INFN-Genova. We also benefitted from fruitful discussions with Professor Werner Meyer of the Ruhr Universität–Bochum. This work was supported in part by grants from the United States Department of Energy and the National Science Foundation, and by an Academic Enhancement Program grant from the University of Virginia.


  • Polarized target
  • Spin
  • Structure functions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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