Canted undulator front-end exit-mask flow-induced vibration measurements.

Collins, J. ; Doose, C. L. ; Attig, J. N. ; Baehl, M. M.

Argonne National Laboratory

关键词: Heat Transfer;    43 Particle Accelerators;    Stability;    Design;    Apertures;   

DOI  :  10.2172/843175
RP-ID  :  ANL/APS/LS-306
RP-ID  :  W-31-109-ENG-38
RP-ID  :  843175

美国|其它

来源: UNT Digital Library

【 摘 要 】

All of the high-heat-load critical components in the new canted-undulator front-end (CU FE) design use wire-coil inserts inside of the cooling channels to significantly enhance heat transfer. Wire-coil inserts have replaced the copper-mesh inserts used in previous front-end high-heat-load critical-component designs. The exit mask, the most downstream component in the CU FE line relative to the x-ray beam path, has an exit aperture of 2 mm vertical x 3 mm horizontal and is the most sensitive component, in terms of final beam stability, of all of the CU FE components. In general, final beam stability is determined by the storage-ring output-beam stability and not by the CU FE components. Although front-end components are not very sensitive to vibration, several measurements have been performed to assess the flow-induced vibration associated with the CU FE exit mask. Results yield only 0.16 {micro}mrms vertical displacement and 1.0 {micro}mrms horizontal displacement under worst-case conditions. The maximum displacement values are very small compared to the aperture size, and therefore flow-induced vibration has a negligible effect on the CU FE output beam stability. More general measurements have also been performed to directly compare flow-induced vibration in an open, unrestricted tube relative to the same tube containing either a wire-coil insert or a copper-mesh insert. Operational performance data are presented for these heat-transfer-enhancing inserts, and the advantages and disadvantages, in terms of selection criteria, are discussed.