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Hino, M.

Paper Title Page
MOPEB067 The Novel Method of Focusing-SANS with Rotating Magnetic Sextupole Lens and Very Cold Neutrons 427
 
  • M. Yamada, M. Ichikawa, Y. Iwashita, T. Kanaya, H. Tongu
    Kyoto ICR, Uji, Kyoto
  • K.H. Andersen, P.W. Geltenbort, B. Guerard, G. Manzin
    ILL, Grenoble
  • M. Bleuel
    RID, Delft
  • J.M. Carpenter, L. Jyotsana
    ANL, Argonne
  • M. Hino, M. Kitaguchi
    KURRI, Osaka
  • K. Hirota
    RIKEN, Wako, Saitama
  • S.J. Kennedy
    ANSTO, Menai
  • K. Mishima, H.M. Shimizu, N.L. Yamada
    KEK, Tsukuba
  
 

We have de­vel­oped a mo­tor­ized mag­net­ic lens for fo­cus­ing of pulsed white neu­tron beams. The lens is com­posed of two con­cen­tric per­ma­nent mag­net ar­rays, in sex­tupole ge­om­e­try, with bore of 15 mm and mag­net length of 66 mm. The inner mag­net array is sta­tion­ary, while the outer array is ro­tat­ed (the fre­quen­cy of the mod­u­la­tion of mag­net­ic field in­side the bore ν ≤ 25Hz), pro­vid­ing a sex­tupole mag­net­ic field gra­di­ent range of 1.5x104T/m2 ≤ g' ≤ 5.9x104T/m2. By syn­chro­niza­tion of a pulsed neu­tron beam with the si­nu­soidal mod­u­la­tion of the mag­net­ic field in the lens, the beam is fo­cused, with­out sig­nif­i­cant chro­mat­ic aber­ra­tion, over a wide neu­tron wave­length band. We have con­struct­ed a fo­cus­ing-SANS (Small Angle Neu­tron Scat­ter­ing) test bed on the PF2-VCN (Very Cold Neu­tron) beam line at the In­sti­tut Laue-Langevin in Greno­ble. The beam image size matched the source size (≈ 3mm) over of wave­length range of 30Å ≤ λ ≤ 48Å with focal length of ~ 2.3 m. Fur­ther, we have demon­strat­ed the per­for­mance of this de­vice for high res­o­lu­tion time-of-flight (tof) SANS for a se­lec­tion of poly­mer­ic & bi­o­log­i­cal sam­ples, in a com­pact ge­om­e­try of just 5 m.