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Title: Thermal Stress Analyses for an NLC Positron Target with a 3 mm Spot Radius Beam

Abstract

The power deposition of an incident electron beam in a tungsten-rhenium target and the resultant thermal shock stresses in the material have been modeled with a transient, dynamic, structural response finite element code. The Next Linear Collider electron beam is assumed split into three parts, with each part impinging on a 4 radiation lengths thick target. Three targets are required to avoid excessive thermal stresses in the targets. Energy deposition from each beam pulse occurs over 265 nanoseconds and results in heating of the target and pressure pulses straining the material. The rapid power deposition of the electron beam and the resultant temperature profile in the target generates stress and pressure waves in the material that are considerably larger than those calculated by a static analysis. The 6.22 GeV electron beam has a spot radius size of 3 mm and results in a maximum temperature jump of 147 C. Stress pressure pulses are induced in the material from the rapid thermal expansion of the hotter material with peak effective stresses reaching 83 ksi (5.77 x 10{sup 8} Pa) on the back side of the target, which is less than one half of the yield strength of the tungsten/rhenium alloy andmore » below the material fatigue limit.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
15002785
Report Number(s):
UCRL-ID-150018
TRN: US0402366
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 28 Aug 2002
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALLOYS; DEPOSITION; ELECTRON BEAMS; HEATING; LINEAR COLLIDERS; POSITRONS; RADIATION LENGTH; STRESSES; TARGETS; THERMAL EXPANSION; THERMAL SHOCK; THERMAL STRESSES; YIELD STRENGTH

Citation Formats

Stein, W, Sunwoo, A, Sheppard, J C, Bharadwaj, V, and Schultz, D. Thermal Stress Analyses for an NLC Positron Target with a 3 mm Spot Radius Beam. United States: N. p., 2002. Web. doi:10.2172/15002785.
Stein, W, Sunwoo, A, Sheppard, J C, Bharadwaj, V, & Schultz, D. Thermal Stress Analyses for an NLC Positron Target with a 3 mm Spot Radius Beam. United States. doi:10.2172/15002785.
Stein, W, Sunwoo, A, Sheppard, J C, Bharadwaj, V, and Schultz, D. Wed . "Thermal Stress Analyses for an NLC Positron Target with a 3 mm Spot Radius Beam". United States. doi:10.2172/15002785. https://www.osti.gov/servlets/purl/15002785.
@article{osti_15002785,
title = {Thermal Stress Analyses for an NLC Positron Target with a 3 mm Spot Radius Beam},
author = {Stein, W and Sunwoo, A and Sheppard, J C and Bharadwaj, V and Schultz, D},
abstractNote = {The power deposition of an incident electron beam in a tungsten-rhenium target and the resultant thermal shock stresses in the material have been modeled with a transient, dynamic, structural response finite element code. The Next Linear Collider electron beam is assumed split into three parts, with each part impinging on a 4 radiation lengths thick target. Three targets are required to avoid excessive thermal stresses in the targets. Energy deposition from each beam pulse occurs over 265 nanoseconds and results in heating of the target and pressure pulses straining the material. The rapid power deposition of the electron beam and the resultant temperature profile in the target generates stress and pressure waves in the material that are considerably larger than those calculated by a static analysis. The 6.22 GeV electron beam has a spot radius size of 3 mm and results in a maximum temperature jump of 147 C. Stress pressure pulses are induced in the material from the rapid thermal expansion of the hotter material with peak effective stresses reaching 83 ksi (5.77 x 10{sup 8} Pa) on the back side of the target, which is less than one half of the yield strength of the tungsten/rhenium alloy and below the material fatigue limit.},
doi = {10.2172/15002785},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {8}
}

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