Author: Gao, Z.Q.
Paper Title Page
WEPPP018
 Water-cooled Tungsten Bremsstrahlung Collimator with Adjustable Height for Adapting the Offset of Beamline  
 
  • Z.Q. Gao, Q. Han
    IHEP, Beijing, People’s Republic of China
  
  Bremsstrahlung col­li­ma­tor is a de­vice lo­cated in HPES(High En­ergy Pho­ton Source) beam­line sta­tion. It is used to com­pletely block the pos­si­ble line of sight of the ra­di­a­tion and to prop­erly col­li­mate the bremsstrahlung ra­di­a­tion so that it has a de­fined open­ing angle at col­li­ma­tor exit. Be­cause of the ap­pli­ca­tion in vac­uum and with the aid of bremsstrahlung ray trac­ing a tung­sten block with trans­verse di­men­sion 200 mil­lime­ters is used as the bremsstrahlung stop. In order to adapt the ver­ti­cally beam off­set caused by mono­chro­ma­tor, a lift­ing mech­a­nism which uses step­per motor as dri­ving part is de­signed to ac­com­plish the up and down move­ment of the tung­sten block. To meet the white light mode with high power den­sity of the light beam, which might re­sult in a high-heat-load on the tung­sten block sur­face after the in­ter­ac­tion be­tween syn­chro­tron ra­di­a­tion and block, a wa­ter-cooled struc­ture made of oxy­gen-free cop­per rod with inlet and out­let wa­ter-cool­ing chan­nels is as­sem­bled in front of the tung­sten block. Thus, con­tribut­ing to heat dis­si­pa­tion of the whole struc­ture.  
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