Continuous energy measurement of the electron beam in the storage ring of Diamond Light Source with resonant spin depolarization

Niki Vitoratou, Pavel Karataev, Guenther Rehm

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Electron spin polarization occurs naturally in an electron storage ring due to spin-flip synchrotron radiation. The equilibrium polarization level that is achieved in Diamond Light Source was studied theoretically and experimentally. A novel approach that enables measurements during user operation is presented, compatible with beams of small vertical emittance in the range of pm rad. An array of four custom-made scintillation detectors has been installed around the beam pipe downstream from the collimators to capture a significant fraction of the lost particles and witness the depolarization process in the presence of a background loss rate. A new concept for detecting the depolarization resonance even when it coincides with higher-order betatron resonances was introduced. The momentum compaction factor was measured to be in very good agreement with the storage ring numerical model. In the end, we measured a good long-term stability of the beam energy during user operation time.

Original languageEnglish
Article number122801
JournalPhysical Review Accelerators and Beams
Volume22
Issue number12
DOIs
Publication statusPublished - 10 Dec 2019
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)
  • Surfaces and Interfaces

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