Conveners
Polarized Sources and Targets: Chair: Shunsuke Ikeda
- Shunsuke Ikeda (BNL)
- Genki NUKAZUKA (RIKEN BNL Research Center)
- Kenichiro Tateishi (RIKEN)
Polarized Sources and Targets: Chair: Shunsuke Ikeda
- Genki NUKAZUKA (RIKEN BNL Research Center)
- Shunsuke Ikeda (BNL)
- Kenichiro Tateishi (RIKEN)
Polarized Sources and Targets: Chair: Genki Nukazuka
- Shunsuke Ikeda (BNL)
- Kenichiro Tateishi (RIKEN)
- Genki NUKAZUKA (RIKEN BNL Research Center)
Polarized Sources and Targets: Chair: Genki Nukazuka
- Genki NUKAZUKA (RIKEN BNL Research Center)
- Shunsuke Ikeda (BNL)
- Kenichiro Tateishi (RIKEN)
In Europe are running three polarized solid state targets in single and double polarized scattering experiments. In Bonn at ELSA and in Mainz at MAMI are two targets located. Both are so called frozen spin targets, which are dynamically polarized and during data taking the material is cooled down to 50 mK and lower, where the spins are frozen what means the relaxation time is increased to...
A precision online polarimeter for the P2 experiment at the upcoming MESA accelerator is highly desirable. It can be realized in the following manner: A solenoid trap is integrated into the beamline leading towards the experiment. The trap will contain hydrogen atoms, the high magnetic field leads to a complete electron-spin polarization. Such an arrangement allows online operation because...
With a dedicated apparatus it was shown that the nuclear polarization of hydrogen atoms and its isotopes, produced by a polarized atomic beam source (ABS), can be preserved during the recombination into molecules. In this way, polarized $H_2$ and $D_2$ molecules in hyperfine substates where both nucleons have equal spins are generated. In more recent experiments the ABS was used to determine...
The ILC is an ambitious international collaboration with its positron source especially being at the forefront of pushing technological boundaries. Part of this enterprise has to be the optical matching device responsible for capturing positrons exiting the target and transforming them from a highly divergent beam with a small effective cross-section to a wide, parallel beam to be appropriate...
Muonic helium is a helium atom with one of the two electrons substituted by a negative muon. This three-body atomic system gives rise to opportunities to precisely study the hyperfine structure interval as well as the negative muon magnetic moment and mass. Muonic helium atoms are formed by stopping a negative muon beam in dense helium gas, but in this formation process, the polarization of...
For more than 50 years Sona transition units have been used at polarized sources to exchange the occupation numbers between ‘pure’ hyperfine substates. For instance, hydrogen atoms in the hyperfine substate $|F=1,\, m_F = +1\rangle$ are transferred into $|F=1,\, m_F =-1\rangle$ when these atoms are passing a static magnetic field gradient between two opposing solenoidal magnetic fields. Thus,...
The production of an internal magnetic field in a compact space is a challenging problem and a versatile solution is being pursued. The property of a hollow superconductor is exploited in order to trap a specific configuration of magnetic field, which could shield the interior from externally applied fields. This can be achived applying the desired magnetic configuration during the cooling...
Like the ANKE experiment at COSY a polarized internal storage-cell target in front of the LHCb detector is the aim of the LHCSpin Projekt at CERN. This target will be an openable T-shaped tube that will be fed with a beam of polarized hydrogen atoms from an atomic beam source (ABS) operating according to the Stern-Gerlach principle. One critical detail of such a storage cell is the surface...
Polarized $^3$He nuclear targets have been invaluable surrogates for polarized neutron targets in spin-dependent scattering studies of the quark and gluon structure of matter. Traditional polarized $^3$He targets have seen dramatic improvements in the last three decades, however they have been limited in their use in spectrometers that utilize high-magnetic-field tracking systems, such as...
Run Group C comprises seven experiments utilizing the CLAS12 detector system in Hall B at Jefferson Lab aiming to study the multidimensional partonic structure of nucleons. The experiments will scatter electrons from polarized protons and neutrons in samples of solid NH3 and ND3, dynamically polarized in a 5 T magnetic field and a temperature of 1 K. After a brief description of the target...
A polarized ion source has contributed to the development of the nuclear physics, as represented by the measurement of analyzing power. At University of Tsukuba Tandem Accelerator Complex (UTTAC), a Lamb-shift polarized ion source (PIS) is operated as one of the injections of 6 MV tandem accelerator. The PIS can produce highly negative polarized proton and deuteron beams. The PIS was damaged...
The concept of an imaging-type 3D spin detector, based on the combination of spin-exchange interactions in the ferromagnetic film and spin selectivity of the electron–photon conversion effect in a semiconductor heterostructure, is proposed and demonstrated on a model system. This novel multichannel concept is based on the idea of direct transfer of a 2D spin-polarized electron distribution to...
The SpinQuest experiment at Fermilab aims to extract Sivers functions for the sea quarks in the range of 0.1 < $x_B$ < 0.5 through single spin asymmetry measurements of di-muon pairs resulting from the Drell-Yan process. The proposed beam intensity is 1.5 × 10$^{12}$ of 120 GeV unpolarized proton/sec. The experiment utilizes a transversely polarized fixed target system which consist of a 5T...
The SpinQuest experiment at Fermilab will utilizes a high intensity 120 GeV proton beam incident on a transversely polarized target. The likely behavior of the SpinQuest polarized target due to beam heating and radiation damage has been recently analyzed. The target temperature will increase due to the beam heating which can cause local depolarization of the target material. The temperature of...
The spin of the nucleon is well established but the contribution to this intrinsic value from its constituent partons is still under intense investigation. As part of a global effort to map out these individual contributions, the SpinQuest experiment at Fermilab aims to add significantly to the level of information available on sea-quarks by measuring their Sivers function. To separate the...
Constant current continuous wave Nuclear Magnetic Resonance (NMR) has been an essential tool for polarized target experiments in Nuclear and High-energy physics. Q-meter based phase-sensitive detection can provide accurate monitoring of the polarization over the course of a scattering experiment with limitations due to some operational parameters. In this talk, we present recent studies of...
