PAC09 - List of Authors (Mizrahi, J.)

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Mizrahi, J.

Paper	Title	Page
TU6PFP100	Temperature and Stress Rise Induced by Cracks in Accelerating Structures	1529
	W. Zhu, T.M. Antonsen, J. Mizrahi, G.S. Nusinovich, G. Sharon UMD, College Park, Maryland
	Funding: Office of High Energy Physics of DoE. The achievable gradient of accelerating structures is limited by dark current capture, RF breakdown and cyclic fatigue. We consider only one effect related to the cyclic fatigue which can be important for reliable operation of high gradient structures, viz. the temperature and stress rise caused by the RF magnetic fields which can be increased in cracks. We made detailed analysis and simulations on the temperature and stress distribution and temporal evolution in the vicinity of cracks of different shapes on the copper when there is a heat flux, and compared the results to the case of a smooth metallic plane. We found out that the temperature will approximately double at the crack upper corners and stress will increase several times at the crack bottom at the beginning and then drop as the crack grows. This analysis gives some insight of the cyclic fatigue leading to the formation of microcracks and crack growth.

Paper

Title

Page

TU6PFP100

Temperature and Stress Rise Induced by Cracks in Accelerating Structures

1529

W. Zhu, T.M. Antonsen, J. Mizrahi, G.S. Nusinovich, G. Sharon
UMD, College Park, Maryland

Funding: Office of High Energy Physics of DoE.

The achievable gradient of accelerating structures is limited by dark current capture, RF breakdown and cyclic fatigue. We consider only one effect related to the cyclic fatigue which can be important for reliable operation of high gradient structures, viz. the temperature and stress rise caused by the RF magnetic fields which can be increased in cracks. We made detailed analysis and simulations on the temperature and stress distribution and temporal evolution in the vicinity of cracks of different shapes on the copper when there is a heat flux, and compared the results to the case of a smooth metallic plane. We found out that the temperature will approximately double at the crack upper corners and stress will increase several times at the crack bottom at the beginning and then drop as the crack grows. This analysis gives some insight of the cyclic fatigue leading to the formation of microcracks and crack growth.