Conveners
Acceleration, storage and polarimetry of polarized beams: 01
- Boxing Gou (Institute of Modern Physics, CAS)
- Zhe DUAN (高能所)
Description
Conveners: Frank Maas, Haixin Huang, Boxing Gou
Electric Dipole Moments (EDMs) are very sensitive probes of physics beyond the Standard Model (SM). The JEDI collaboration aims to measure the EDMs of charged particles making use of polarized beams in a storage ring. Such a precision experiment requires the maximization of the Spin Coherence Time (SCT). To identify the working conditions that maximize the SCT, the spin tune of the single...
The study of the spin effects and polarization phenomena in hadronic reactions is the traditional scientific direction of JINR. Nowadays Spin Physics Detector [1] at NICA as well as new spin projects at the fixed targets [2,3] at Nuclotron are in preparation. This research program requires the development of high intensity polarized beams, polarized targets, beam and focal polarimetry,...
Until 2023, a polarized H$^-$/D$^-$ ion source delivered pulsed negative ion beams for stripping injection into the COSY accelerator. Accurate and efficient measurement of the nuclear spin polarization directly behind the source is essential for precision experiments at COSY. A data acquisition system was developed to enable reliable, automated measurements with improved efficiency and to...
The principle of using multiple partial helical magnets to preserve the polarization of the proton beam during its acceleration was applied successfully to the alternating gradient synchrotron (AGS) which currently operates with two partial helical magnets. In this paper we further explore this idea by using four partial helical magnets placed symmetrically in the AGS ring. This provides many...
The P2 experiment at Mainz Energy-Recovering Superconducting Accelerator (MESA) aims to measure the Weinberg angle with an uncertainty of 0.15%. This implies that the uncertainty of the beam polarization measurement must be less than 1%. To achieve this, a polarimetry chain with polarimeters operating at different energies and principles is being developed.
As a part of this polarimetry...
This presentation will overview the study of polarized lepton beams in the context of resonant depolarization and longitudinal polarized colliding beams, for the 100km scale Circular Electron Positron Collider (CEPC), including design studies and R&D progress, as well as the potential of attaining longitudinal polarization at BEPCII.
Over the past few decades, polarized electron beams have been actively used in various fields of physics. Mott, Moller, and Compton scattering methods are used to diagnose the polarization of such beams. We propose to use a different method. The high charge densities achieved in electron beams offer the possibility of measuring the polarization by scattering one electron beam off another....
As a key R&D item of polarized lepton beams for future colliders, a laser Compton polarimeter has been designed for the electron storage ring of BEPCII, reusing the X-ray beamline and experimental hutch of a dismantled wiggler source. This article will describe the design considerations of the Compton polarimeter, report the first phase beamline modification and preliminary beam commissioning...
To produce high-intensity polarized beams of deuterons and protons, the Laboratory of High Energy Physics (LHEP) at JINR is developing a Source of Polarized Ion (SPI).
Within the framework of the SPI project, low-energy polarimeters are being developed to measure degree of polarization during beam transport at energies up to 5 MeV/n. These include:
• An NRP (Nuclear Reaction Polarimeter) is...
To investigate the internal spin structure of nucleons and explore fundamental phenomena such as parity and time-reversal symmetry violations, polarized deuteron beams play a pivotal role as they serve as a unique substitute for polarized neutron beams and enable access to tensor polarization—a critical feature of spin-1 systems that provides distinct insights beyond vector polarization. This...
