Performance of a polarized deuterium internal target in a medium-energy electron storage ring

Z. L. Zhou, M. Ferro-Luzzi, J. F J Van Den Brand, H. J. Bulten, Ricardo Alarcon, R. Van Bommel, T. Botto, M. Bouwhuis, M. Buchholz, S. Choi, J. Comfort, M. Doets, S. Dolfini, R. Ent, C. Gaulard, C. W. De Jager, J. Lang, D. J. De Lange, M. A. Miller, E. PasschierI. Passchier, H. R. Poolman, E. Six, J. Steijger, O. Unal, H. De Vries

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

A polarized deuterium target internal to a medium-energy electron storage ring is described in the context of spindependent (e, e′d) and (e ,e′p) experiments. Tensor polarized deuterium was produced in an atomic beam source and injected into a storage cell target. A Breit-Rabi polarimeter was used to monitor the injected atomic beam polarization. An electrostatic ion-extraction system and a Wien filter were utilized to measure on-line the atomic fraction of the target gas (71 ± 2%) in the storage cell. A target thickness t ≃ 2 × 1013 2H/cm2 was achieved. The target tensor polarization was varied from P+zz = 0.49(3) to P-zz = -0.89(6) while keeping the vector polarization Pz at zero. The luminosity was ∼ 2 × 1031 e- · 2H · cm-2s-1 at a beam current of 120 mA. The performance was stable over a five-week running period. A large acceptance non-magnetic detector system was used for the electron-proton (deuteron) coincidence measurement. It is demonstrated that these techniques result in low backgrounds due to scattering from species other than the polarized target gas and allow for fast and flexible orientation of the target spin. Specific issues such as interfacing the experiment to the storage ring and monitoring the performance of the target system are discussed in detail.

Original languageEnglish (US)
Pages (from-to)40-56
Number of pages17
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume378
Issue number1-2
DOIs
StatePublished - Aug 11 1996

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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    Zhou, Z. L., Ferro-Luzzi, M., Van Den Brand, J. F. J., Bulten, H. J., Alarcon, R., Van Bommel, R., Botto, T., Bouwhuis, M., Buchholz, M., Choi, S., Comfort, J., Doets, M., Dolfini, S., Ent, R., Gaulard, C., De Jager, C. W., Lang, J., De Lange, D. J., Miller, M. A., ... De Vries, H. (1996). Performance of a polarized deuterium internal target in a medium-energy electron storage ring. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 378(1-2), 40-56. https://doi.org/10.1016/0168-9002(96)00437-8