私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

Links
Contact Info.
  • Address:廣東省東莞市大朗鎮(zhèn)中子源路1號(hào)A1-424#
  • Zip:523000
  • Tel:0769-89156445
  • Fax:0769-69256441
  • Email:chenghe@ihep.ac.cn
Current Location :> Home > Publications > Text
A New Laser-based Alignment Method for the Multi-slits VSANS in High Precision
writer:T. Luo, Z.Q. He, * H. Cheng, * T.S. Zuo, S.W. Xiao, S. Lua, Z.Y. Ke, N. Ma, T. Wang, J. Liang, L.
keywords:微小角中子散射,多狹縫,激光準(zhǔn)直
source:期刊
specific source:Nuclear Inst. and Methods in Physics Research A, 1010, 165526, 2021
Issue time:2021年

A multi-slit (MS) Very Small Angle Scattering (VSANS) instrument is now under construction on Beam Line 14 in China Spallation Neutron Source (CSNS). It is an upgrade of traditional SANS that extends the measurement length scale up to 1 micrometer. Success of the instrument depends on the precise alignment of the millimeter width MSs over more than 12 m. A prototype system has been built to rehearse the alignment of the 12 MSs. A traditional laser tracker is firstly chosen to align the 12 MSs coarsely to about ±100μm, which is less than the

required accuracy of ±25μm. Then a laser-based non-contact alignment technique is used. When the expanded laser beam images MS directly to a high-resolution CCD, relative positions of each MS perpendicular to the beam line can be further aligned precisely. The transverse deviation of the 12 MSs can be kept within ±5μm. High accuracy of the technique guarantees the success of the VSANS instrument, and can be applicable to other systems that need high lateral precision over long distance.