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  • 1
    Electronic Resource
    Electronic Resource
    Development of a broadband laser in the UV region (2000)
    Springer
    Hyperfine interactions 127 (2000), S. 503-506 
    Details
    ISSN: 1572-9540
    Keywords: broadband laser ; ultraviolet ; ion cooling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A frequency comb in the UV region with a bandwidth greater than 100 MHz is generated by successive frequency shifts of a single mode laser by an acousto-optic modulator coupled to a passive ring cavity. The obtained spectrum is particularly suitable for laser cooling when a large velocity capture range is required as in the case, for example, of ions confined in a storage ring.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012642423134
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  • 2
    Electronic Resource
    Electronic Resource
    The HERMES internal polarized hydrogen and deuterium target (2000)
    Springer
    Hyperfine interactions 127 (2000), S. 481-484 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The HERMES experiment at the electron ring of HERA at DESY studies the spin structure of proton and neutron by deep inelastic scattering of polarized electrons off the nucleons of a highly polarized internal gas target. The target makes use of a storage cell to increase the target density. The polarisation of a sample of the atoms in the cell is measured with a Breit-Rabi polarimeter. A relaxation model based on the diffusion equation has been developed, which is used to calculate the corrections which are needed to determine the absolute target polarization using the measured values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012634221317
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  • 3
    Electronic Resource
    Electronic Resource
    Molecular flow and wall collision age distributions (2002)
    Springer
    The European physical journal 18 (2002), S. 37-49 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 47.45.Dt Free molecular flows – 51.20.+d Viscosity, diffusion, and thermal conductivity – 29.25.Pj Polarized and other targets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The use of storage cells has become a standard technique for internal gas targets in conjunction with high energy storage rings. In case of spin-polarized hydrogen and deuterium gas targets the interaction of the injected atoms with the walls of the storage cell can lead to depolarization and recombination. Thus the number of wall collisions of the atoms in the target gas is important for modeling the processes of spin relaxation and recombination. It is shown in this article that the diffusion process of rarefied gases in long tubes or storage cells can be described with the help of the one-dimensional diffusion equation. Mathematical methods are presented that allow one to calculate collision age distributions (CAD) and their moments analytically. These methods provide a better understanding of the different aspects of diffusion than Monte Carlo calculations. Additionally it is shown that measurements of the atomic density or polarization of a gas sample taken from the center of the tube allow one to determine the possible range of the corresponding density weighted average values along the tube. The calculations are applied to the storage cell geometry of the HERMES internal polarized hydrogen and deuterium gas target.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/e10053-002-0004-9
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  • 4
    Electronic Resource
    Electronic Resource
    Sodium MOT collection efficiency as a function of the trapping and repumping laser frequencies and intensities (2001)
    Springer
    The European physical journal 13 (2001), S. 71-82 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 32.80.Pj Optical cooling of atoms; trapping - 42.50.Vk Mechanical effects of light on atoms, molecules, electrons, and ions - 32.60.+i Zeeman and Stark effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: A detailed theoretical and experimental description of a sodium MOT as a function of the pumping and repumping laser frequencies and intensities is given. The effective trapping schemes and the collection efficiency have been experimentally measured and calculated by solving an original 3D model. This model considers the whole bunch of the 32 ground and excited (P1/2 + P3/2) Zeeman sublevels, the actual trap geometry, the magnetic field intensity and direction, the light polarization, and evaluates both the velocity capture range and the number of trapped particles N. Synergetic and competition mechanisms due to the trapping and repumping lasers have been predicted and experimentally observed. The model simulation has been compared with the results reported in the literature and with those obtained by us and a quite good agreement has been found. The model can be easily adapted to the other sodium isotopes as well as to all the other alkalis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530170289
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    Paper (German National Licenses)
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