Estimation of Cryogenic Heat Loads in Cryomodule due to Thermal Radiation
Cryogenic system is one of major cost drivers in high intensity superconducting (SC) continuous wave (CW) accelerators. Thermal radiations coming through the warm-ends of cryomodule and room temperature parts of the power coupler result in additional cryogenic heat loads. Excessive heat load in 2K environment may degrade overall performance of the cavity. In this paper we present studies performed to estimate additional heat load at 2K due to thermal radiation in 650 MHz cavity cryomodule in high energy section of PIP-II SC linac.
HIGH POWER COUPLERS FOR PROJECT X
Project X, is a multi-megawatt proton source under development at Fermi National Accelerator Laboratory. The key element of the project is a superconducting (SC) 3GeV continuous wave (CW) proton linac. The linac includes 5 types of SC accelerating cavities of two frequencies, 325 and 650MHz.The highest Beta cavities each consume up to 30 kW average RF power and need properly designed main couplers. This paper describes the requirements and approach to the coupler design for each cavity, presents results of electrodynamic and thermal simulations, and describes new schemes for increasing cost effectiveness. COUPLERS REQUIREMENTS The parameters of the five families of cavities in the 3 GeV Project X superconductive linac are presented in Table 1. Table 1: Cavity Parameters
PHYSICS DESIGN OF THE PROJECT X CW LINAC
The general design of the 3 GeV superconducting CW linac of the Project X is presented. Different physical and technical issues and limitations that determine the linac concept are discussed. The results of the RF system optimization are pres ented as well as the lattice design and beam dynamics analysis.