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TUAZ01 Overview of recent halo diagnosis and non-destructive beam profile monitoring electron, synchrotron, diagnostics, radiation 54
 
  • K. Wittenburg
    DESY, Hamburg
  Beam profile (emittance) and beam halo are characteristic properties of high-intensity and high energy beams that might limit the performance of the adjacent accelerator. Therefore a reliable measurement and determination of these parameters is most helpful for understanding, tuning and improvement of the whole accelerator chain to achieve the best (at least the design-) performance. This talk will give an overview over recent instruments used for non-destructive beam profile and halo monitoring and will discuss their limits, experiences and latest improvements.  
 
TUAZ06 Development of hybrid typoe carbon stripper foils with high durability against 1800K for RCS of J-PARC injection, linac, vacuum, ion 122
 
  • I. Sugai, Y. Arakida, Z. Igarashi, K. I. Ikegami, Y. Irie, H. Kawakami, M. Oyaizu, A. Takagi, Y. Takeda
    KEK, Ibaraki
  We have successfully made long-lived and hybrid , thick, boron mixed carbon stripper foils for high energy and high intensity accelerators. The foils were made by the controlled DC arc-discharge method, and the thickness is wide range from 50 to 600 ug/cm2. The lifetime of the foils was tested with use of 3.2 MeV Ne+DC beams of 2.5 uA, in which a significant of energy was deposited in the foils and thus we could simulate the condition by high power accelerator. The lifetime in maximum was shown to be extremely long, 102 and 410 times longer those of diamond and commercially available best carbon foils, respectively.  
 
WEAY06 Experimental Strategy for Realization of 3-D Beam Ordering with Use of Tapered Cooling at S-LSR ion, coupling, vacuum, proton 231
 
  • A. Noda, M. Ikegami, T. Shirai, H. Souda, M. Tanabe
    Kyoto ICR, Uji, Kyoto
  • K. Noda
    NIRS, Chiba-shi
  • H. Okamoto
    HU/AdSM, Higashi-Hiroshima
  At ICR, Kyoto University, an ion storage/cooler ring, S-LSR has been operated since the October, 2005. S-LSR has capability of dispersion free mode* throughout the whole circumference in order to avoid the shear heating** due to momentum dispersion of ion beam orbits. With such a mode, we need a special devise to develop necessary coupling between the longitudinal and transverse degrees of freedom for 3-dimensional laser cooling.*** A Wien Filter, in which the magnetic and electric fields overlap with strengths compensating each other for ions with a certain velocity, is to be utilized in the straight section where the usual laser cooling is applied. Due to the potential difference caused by the electric field in the Wien Filter, the difference in horizontal position of the circulating ion creates the difference of the equillibrium energy after laser cooling, which realizes "Tapered Cooling"****. In the present paper, a possible strategy of experimental approach at S-LSR toward 3-dimensional crystalline ion beams with use of the Wien Filter is to be presented.

* M. Ikegami et al., PR-STAB,7, 120101(2004).
** A. Rahman and J. P. Schiffer, PRL, 57, 1133(1986).
*** H. Okamoto et al., PRL 72, 3977-3980 (1994).
**** J. Wei et al., PRL 80, 2606-2609 (1998).

 
 
THAY04 Review of high-brightness proton and ion acceleration using pulsed lasers proton, target, ion, electron 319
 
  • J. Fuchs
    University of Nevada, Reno, Reno, Nevada
  In the last few years, intense research has been conducted on laser-accelerated ion sources and their applications. These sources have exceptional properties, i.e. high brightness and high spectral cut-off, high directionality and laminarity, short burst duration. We have shown that for proton energies >10 MeV, the transverse and longitudinal emittance are respectively <0.004 mm-mrad and <10-4 eV-s, i.e. at least 100-fold and may be as much as 104-fold better than conventional accelerators beams. Thanks to these properties, these sources allow for example point-projection radiography with unprecedented resolution. They also open new opportunities for ion beam generation and control, and could stimulate development of compact ion accelerators for many applications. We have shown [*] that there is an optimum in the laser pulse duration of ~200 fs-1 ps, with a needed laser energy level of 30 to 100 J, in order to achieve e.g. 200 MeV energy protons. Also, as, for such applications beam control is an essential requirement, we have developed [**] an ultra-fast laser-triggered micro-lens that allows tuneable control of the beam divergence as well as energy selection.

[*] J. Fuchs et al., Nature Physics 2, 48 (2006).
[**] T. Toncian, M. Borghesi, J. Fuchs et al, www.sciencexpress.org / 16 February 2006 / 10.1126/science.1124412.

 
 
FRAP07 Summary of Working Group F ion, acceleration, proton, synchrotron 375
 
  • S. R. Koscielniak
    TRIUMF, Vancouver