Title :
Beam impact studies on ILC collimators
Author :
Ellwood, George ; Greenhalgh, Justin
Author_Institution :
STFC/RAL, Didcot
Abstract :
Spoilers in the ILC Beam Delivery System are required to survive without failure a minimum of 1-2 direct impacts from each energetic electron or positron bunch of charged particles, in addition to maintaining low geometric and resistive wall wake fields. The transient shock wave resulting from rapid localised beam heating and its implications for spoiler design are studied using ANSYS. Shockwave propagation is modelled in 2 dimensions showing the effect of dilatational Shockwaves striking free surfaces, producing reflected dilatational and distortional waves. The implication of these reflected waves on the damage of the collimators is also discussed.
Keywords :
beam handling techniques; collimators; particle beam bunching; 2-dimensional shockwave propagation; ILC beam delivery system; ILC collimators; beam impact studies; dilatational waves; distortional waves; energetic electron bunch; energetic positron bunch; rapid localised beam heating; resistive wall wake fields; transient shock wave; Collimators; Electron beams; Finite element methods; Heat transfer; Life estimation; Manufacturing; Particle beams; Positrons; Shock waves; Stress;
Conference_Titel :
Particle Accelerator Conference, 2007. PAC. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0916-7
DOI :
10.1109/PAC.2007.4440600
