Author
M. Rall
Bio: M. Rall is an academic researcher from Max Planck Society. The author has contributed to research in topics: Hydrogen & Hyperfine structure. The author has an hindex of 3, co-authored 4 publications receiving 107 citations.
Papers
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TL;DR: A feasibility test of a new method to polarize beams of strongly interacting charged particles circulating in a storage ring is described, and the polarization buildup is clearly demonstrated.
Abstract: A feasibility test of a new method to polarize beams of strongly interacting charged particles circulating in a storage ring is described. The stored particles, here protons, pass through a polarized hydrogen gas target (thickness 6\ifmmode\times\else\texttimes\fi{}${10}^{13}$ H/${\mathrm{cm}}^{2}$) in the ring some ${10}^{10}$ times and become partially polarized because one spin state is attenuated faster than the other. The polarization buildup is clearly demonstrated in the present experiment.
69 citations
01 Jan 1996-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this article, a high-density target of polarized atomic hydrogen gas for applications in storage rings was produced by injecting atoms from an atomic beam source into a T-shaped storage cell.
Abstract: A high-density target of polarized atomic hydrogen gas for applications in storage rings was produced by injecting atoms from an atomic beam source into a T-shaped storage cell. The influence of the internal gas target on electron-cooled beams of 27 MeV α-particles and 23 MeV protons in the Heidelberg Test Storage Ring has been studied in detail. Target polarization and target thickness were measured by means of 27 MeV α-particles. For hyperfine states 1 + 2 a target thickness of n = (0.96±0.04) × 1014H→/cm2 was achieved with the cell walls cooled to 100 K. Working with a weak magnetic holding field (≈5 G) the maximum target polarization was PT = 0.84±0.02 when state 1 and PT = 0.46±0.01 when states 1 + 2 were injected. The target polarization was found to be constant over a period of 3 months with a net charge of Q ≈ 100C passing the storage cell.
20 citations
TL;DR: A target of gaseous polarized hydrogen was formed by injecting polarized hydrogen atoms (produced by Stern-Gerlach spin separation) into a storage cell consisting of a cylindrical tube open at both ends.
Abstract: A target of gaseous polarized hydrogen was formed by injecting polarized hydrogen atoms (produced by Stern–Gerlach spin separation) into a storage cell consisting of a cylindrical tube open at both ends. The target was placed in a storage ring to study the target characteristics (nuclear polarization, target thickness, radiation resistance). A weak transverse guide field (5 G) was applied to define the polarization direction. When atoms in a single hyperfine state were selected, the nuclear polarization of the target was measured to be 0.80±0.02. The areal density of the target under these conditions was (5.5±0.2)×1013 H/cm2, while for two spin states (applicable to experiments in high energy rings where a strong magnetic field can be applied to the target) the target thickness was found to be (8.2±0.3)×1013 H/cm2. The target polarization was unaffected by prolonged exposure of the target to beams up to 1 mA.
19 citations
12 May 2008
TL;DR: In this article, a stored proton beam was polarized by sp dependent attenuation through a high density polarized hydrogen target, which was carried out at the Heidelberg low energy Test Storage Ring.
Abstract: We report experimental results of a stored proton beam polarized by sp dependent attenuation through a high density polarized hydrogen target The experiment was carried out at the Heidelberg low energy Test Storage Ring The polarized hydrogen storage cell gas target consisted of polarized hydrogen atoms produced by the Heidelberg atomic beam source injected into a thin walled, cylindrical aluminum tube (AIP)
1 citations
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21 Apr 2001-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: ANKE as mentioned in this paper is a new experimental facility for the spectroscopy of products from proton-induced reactions on internal targets, which has recently been implemented in the accelerator ring of the cooler synchrotron COSY of the Forschungszentrum Julich (FZ-Julich), Germany.
Abstract: ANKE is a new experimental facility for the spectroscopy of products from proton-induced reactions on internal targets. It has recently been implemented in the accelerator ring of the cooler synchrotron COSY of the Forschungszentrum Julich (FZ-Julich), Germany. The device consists of three dipole magnets, various target installations and dedicated detection systems. It will enable a variety of hadron-physics experiments like meson production in elementary proton–nucleon processes and studies of medium modifications in proton–nucleus interactions.
158 citations
Max Planck Society1, Heidelberg University2, Katholieke Universiteit Leuven3, CERN4, University of Liverpool5, University of Edinburgh6, University of the West of Scotland7, Sofia University8, Technische Universität Darmstadt9, Bulgarian Academy of Sciences10, Petersburg Nuclear Physics Institute11, University of Manchester12, Technische Universität München13, Spanish National Research Council14, Frankfurt Institute for Advanced Studies15, University of Surrey16, Lund University17, Australian National University18, University of Mainz19, Complutense University of Madrid20, University of Jyväskylä21, University of Helsinki22, Goethe University Frankfurt23, Ludwig Maximilian University of Munich24, Michigan State University25, Chinese Academy of Sciences26, University of York27, Chalmers University of Technology28, University of Groningen29, Daresbury Laboratory30, Beihang University31, University of Warsaw32, University of Cologne33, Aarhus University34, Columbia University35, Lawrence Livermore National Laboratory36, Stockholm University37, Weizmann Institute of Science38, Helmholtz Institute Jena39, University of Jena40, Saitama University41, Dresden University of Technology42
TL;DR: In this article, the authors proposed to install a storage ring at an ISOL-type radioactive beam facility for the first time, which can provide a capability for experiments with stored secondary beams that is unique in the world.
Abstract: We propose to install a storage ring at an ISOL-type radioactive beam facility for the first time. Specifically, we intend to setup the heavy-ion, low-energy ring TSR at the HIE-ISOLDE facility in CERN, Geneva. Such a facility will provide a capability for experiments with stored secondary beams that is unique in the world. The envisaged physics programme is rich and varied, spanning from investigations of nuclear ground-state properties and reaction studies of astrophysical relevance, to investigations with highly-charged ions and pure isomeric beams. The TSR might also be employed for removal of isobaric contaminants from stored ion beams and for systematic studies within the neutrino beam programme. In addition to experiments performed using beams recirculating within the ring, cooled beams can also be extracted and exploited by external spectrometers for high-precision measurements. The existing TSR, which is presently in operation at the Max-Planck Institute for Nuclear Physics in Heidelberg, is well-suited and can be employed for this purpose. The physics cases as well as technical details of the existing ring facility and of the beam and infrastructure requirements at HIE-ISOLDE are discussed in the present technical design report.
109 citations
TL;DR: The production of spin-polarized hydrogen atoms from the photodissociation of hydrogen chloride with circularly polarized 193-nanometer light is inferred from the measurement of the complete angular momentum distributions of ground state Cl(2P3/2)and excited state Cl-cofragments by slice imaging.
Abstract: The production of spin-polarized hydrogen atoms from the photodissociation of hydrogen chloride with circularly polarized 193-nanometer light is inferred from the measurement of the complete angular momentum distributions of ground state Cl( 2 P 3/2 )and excited state Cl( 2 P 1/2 )cofragments by slice imaging. The experimentally measured and ab initio predicted a q (k) (p)parameters, which describe the single-surface and multiple-surface-interference contributions to the angular momentum distributions, are in excellent agreement. For laser pulses longer than about 0.7 ns, the polarization of the electron and the proton are both 36%.
88 citations
TL;DR: The development, in the early 1960s, of the dynamic nuclear polarization scheme in solid diamagnetic materials, doped with paramagnetic radicals, led to the use of solid polarized H and D targets in numerous nuclear and particle physics experiments.
54 citations
11 Apr 1994-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: The FILTEX/HERMES atomic beam source (ABS) for polarized hydrogen is described in this article, where the beam forming system and the sextupole magnet system are optimized.
Abstract: The FILTEX/HERMES atomic beam source (ABS) for polarized hydrogen is described Recent improvements concern mainly the optimization of the beam forming system and a new design of the sextupole magnet system For a precise measurement (error 5%) of the output flow a calibrated compression tube was installed The output flow of 081×1017 H atoms per second in two hyperfine substates was constant within 2% in a long-term measurement over 16 h At the FILTEX test experiment, the target density in the storage cell fed by the ABS was constant within the experimental error of 4% over a period of four months
42 citations