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A 350 MHz, 4.5 MeV RFQ structure is being studied for proposed High Power Proton Linac for Indian SNS. At high RF duty operation of RFQ due to RF induced heating the structure would be subjected to thermal deformations and hence the detuning of resonating structure from its designed resonating frequency. A detailed Thermal-Structural-Electromagnetic sequential analysis of RFQ has been performed using Multi-physics ANSYS (Finite Element Analysis Software). A cooling scheme has been worked out to get the efficient heat removal from the structure to minimize the thermal induced frequency shift. During analysis the parameters such as cooling water flow rate, cooling water inlet temperatures, cooling channel locations, cavity thickness etc. are varied to study the effect of these parameters on temperature distribution and associated frequency variation. The frequency shift is found highly sensitive to vane tip cooling parameters.
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