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
ARES Upgrade for Super-KEKB
ARES is a normal-conducting RF accelerating cavity system for KEKB, which has been successfully operated to store the high-current beams. Aiming at luminosity frontiers beyond 10cms, an upgrade project toward Super-KEKB is being proposed, where about four times more beam currents are to be stored and supported by the RF system. In this report, upgrade items relevant to the ARES system are reviewed and discussed.