NLC Polarized Positron Photon Beam Target Thermal Structural Modeling

Stein, W ; Sheppard, J C

Lawrence Livermore National Laboratory

关键词: Stresses;    Heating;    Photon Beams;    36 Materials Science;    Thermal Expansion;   

DOI  :  10.2172/15003398
RP-ID  :  UCRL-ID-148940
RP-ID  :  W-7405-ENG-48
RP-ID  :  15003398

美国|英语

来源: UNT Digital Library

【 摘 要 】

The NLC polarized positron photon beam target is a 0.4 radiation length thick titanium target. Energy deposition from one pulse occurs over 266 nano-seconds and results in heating of the target and pressure pulses straining the material. The 22.1 MeV photon beam has a spot size of 0.75 mm and results in a maximum temperature jump of 233 C. Stresses are induced in the material from thermal expansion of the hotter material. Peak effective stresses reach 19 Ksi (1.34 x 10{sup 8} Pa), which is lower than the yield strength of a titanium alloy by a factor of six.