19th Workshop on Polarized Sources, Targets, and Polarimetry in Mainz, JGU

Session

Polarimetry

26 Sept 2022, 14:30

HIM

Conveners

Polarimetry

• Andro Kacharava (IKP, Forschungszentrum Jülich)

Polarimetry

• Alexander Nass (Forschungszentrum Jülich, Germany)

Polarimetry

• Joseph Grames (Jefferson Lab)

Polarimetry

• Ralf Engels (Institute for Nuclear Physics, FZ Jülich)

Polarimetry

• Alexander Nass (Forschungszentrum Jülich, Germany)

15. Measurement of the occupation number of metastable atoms in the hyperfine-substate β$_3$ in an atomic hydrogen beam

Mr Moritz Westphal (Institut für Kernphysik, Forschungszentrum Jülich, Jülich, Germany, Fachbereich 10 Energietechnik, FH Aachen, Campus Jülich, Germany, GSI Helmholzzentrum für Schwerionenforschung GmbH)

26/09/2022, 14:30

After the discovery of the Lamb shift in 1947 by Willis Eugene Lamb and Robert C. Retherford it was used to create Lamb shift polarimeter to separate the 2S$_{1/2}$ α$_1$ and α$_2$ hyperfine substates of hydrogen as well as the α$_3$ substate of deuterium. But for a new project at the Technical University of Munich, the bound-beta decay of a neutron into a hydrogen atom and a neutrino, a Lamb...

12. Wien-filter spin rotator with integrated ion pump

Gabriel Palacios Serrano (Thomas Jefferson National Accelerator Facility)

27/09/2022, 14:00

Nuclear physics experiments performed at the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Laboratory (JLab) require highly polarized electron beams, produced from strained super-lattice GaAs/GaAsP photocathodes. To prolong the photocathode operational lifetime, the photogun and adjoining beamline should be maintained at the lowest possible pressure. This presentation...

8. Status of precise measurements of electron-beam polarization changes during long term operation

Mrs Jennifer Groth (Johannes Gutenberg-Universität, Institut für Kernphysik)

28/09/2022, 11:00

For the high-precision measurements in the experiments at the new Mainz Energy recovering Superconducting Accelerator (MESA), it is necessary to know exactly the long-term spin properties of the electron beam.
For this purpose, a test setup has been built at the Institute for Nuclear physics. Different preparation methods of a photocathode with nitrogen trifluoride and oxygen are...

9. Status of kicker and Mott polarimeter at the 5.0 MeV MESA section

Valery Tyukin

28/09/2022, 11:30

The Mainz Energy-recovering Superconducting Accelerator (MESA) requires high-precision measurements of the electron spin polarization.
A chain of polarimeters at different beam energy is planned. A preliminary design of the 5.0 MeV beam transport section containing a kicker which leads the beam

towards a Mott polarimeter is presented.

25. Design of a precise 5 MeV Mott polarimeter operating at high average current

Mrs Rakshya Thapa (Johannes Gutenberg University of Mainz)

28/09/2022, 12:00

A high intensity polarised beam has to be delivered to the P2 experiment at Mainz Energy Recovering Superconducting Accelerator Facility (MESA). The absolute error of the beam polarisation should be ≤0.5 %. To track the polarisation, a Mott polarimeter will be installed after the pre-acceleration of the polarised beam to 5 MeV energy. The goal of this work is to deploy a 5 MeV Mott polarimeter...

18. Polarization measurement of a pulsed 𝑯− / 𝑫− ion Beam with a Lamb-shift Polarimeter

Simon Jakob Pütz (Fz Jülich, GSI Darmstadt)

29/09/2022, 11:00

At the FZ Jülich a polarized ion source produces a pulsed beam of nuclear spin polarized 𝐻− or 𝐷− ions for stripping injection into the storage ring COSY. Before injection, the nuclear polarization needs to be determined and optimized. Until now, this is done with a device called Low Energy Polarimeter (LEP), which is based on the polarization dependent elastic scattering of protons on a...

14. High-precision Møller Polarimetry at Jefferson Lab's Hall A

Eric King (Temole University)

29/09/2022, 11:30

The Thomas Jefferson National Accelerator Facility (JLab) operates the Continuous Electron Beam Accelerator Facility which produces a polarized electron beam which is delivered to four experimental halls and is utilized to probe the fundamental nature of matter. Parity-violating electron scattering experiments are one category of experiments that are run at JLab. For these experiments,...

35. Tests of a polarimeter for laser-driven proton beams at the 45-MeV cyclotron JULIC

Dr Chuan Zheng (PGI-6, Forschungszentrum Jülich)

29/09/2022, 12:00

A novel method of laser-plasma acceleration employing dynamically polarized gas-jet targets (HCl/HBr gas) has been proposed to generate 100-MeV polarized proton beams. To achieve the beam polarization measurement in laser-plasma experiments at multi-Petawatt lasers, we have developed a polarimeter based on $p$-Carbon scattering, detected with the help of solid-state nuclear track detectors,...

17. The Hydrogen Jet Target polarimeter performance in RHIC Run 22

Grigor Atoian (Brookhaven Nat. Lab.)

29/09/2022, 15:00

Since 2005, the Polarized Atomic Hydrogen Gas Jet Target polarimeter (HJET) is used to precisely measure absolute polarization of the proton beams at the Relativistic Heavy Ion Collider (RHIC). In Run 22, the polarized proton beams were resumed at RHIC after four years of heavy ion beam operation. Here we compare HJET performance in the 255 GeV proton Runs 17 and 22. Regardless some changes in...