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The RHIC polarized H⁻ ion source.

A Zelenski1, G Atoian1, D Raparia1

  • 1Brookhaven National Laboratory, Upton, New York 11973, USA.

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|March 3, 2016
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Summary
This summary is machine-generated.

A new polarization technique significantly boosted the intensity and polarization of H(-) ions for the Relativistic Heavy Ion Collider (RHIC). This advancement ensures reliable polarized beams for high-energy physics experiments.

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Area of Science:

  • Nuclear Physics
  • Particle Accelerators
  • Beam Polarization

Background:

  • High-intensity polarized ion sources are crucial for particle collider experiments.
  • Previous methods faced limitations in achieving both high intensity and polarization.

Purpose of the Study:

  • To implement and validate a novel polarization technique for the RHIC H(-) ion source upgrade.
  • To enhance beam intensity and polarization for improved experimental capabilities.

Main Methods:

  • Utilized a high-brightness proton beam ionized in a He-gaseous cell.
  • Employed polarized electron capture from optically pumped Rubidium (Rb) vapor for proton polarization.
  • Integrated the technique into the RHIC H(-) ion source.

Main Results:

  • Achieved a high-intensity H(-) ion beam with 85% polarization.
  • Successfully delivered reliable polarized beams during RHIC Run-2013 and Run-2015.
  • Demonstrated 75% polarization at 23 GeV (AGS) and 60%-65% at 100-250 GeV (RHIC).

Conclusions:

  • The novel polarization technique is effective for upgrading RHIC's polarized H(-) ion source.
  • The enhanced beam characteristics enable higher polarization in collider experiments.
  • This advancement supports precision measurements in heavy-ion and proton-proton collisions.