Superconducting RF Cavity Development for the International Linear Collider

Abstract

The International Linear Collider is planned as the next energy-frontier electron-positron accelerator. The main linacs of the collider are based on superconducting radio-frequency cavity technology, and will accelerate electron and positron beams up to 250 + 250 GeV at the center-of-mass energy. Based on the Reference Design Report issued in 2007, the ILC Global Design Effort has moved into the Technical Design phase. This paper describes the status of the design, R&D efforts, and plans of the superconducting RF cavity for the ILC.

Design and Principles of Linear Accelerators and Colliders

“…Table 7.4 gives a summary of superconducting cavity operation in FLASH, planned operation at European-XFEL, and planned for ILC [65,66]. Superconducting cavity technology is expected to advance substantially through further optimization of cavity materials, shapes (TESLA, Low-Loss, Re-entrant), and cost-effective fabrication techniques [57,[59][60][61][65][66][67][68].…”

A 15-MW Proton Driver for Neutrino Oscillation Experiments

“…The typical properties of a 1.3-GHz superconducting ILC-type cavity are presented, e.g., in [4]. Each ILC-type cryomodule for the proposed SCL would contain eight niobium 9-cell cavities and a focusing quadrupole magnet at its centre.…”

A Multi-MW Proton/Electron Facility at KEK

“…Using Eq. ( 3), the output rf power of an MBK can be expressed as The basic properties of a 1.3GHz superconducting ILC-type cavity are presented, e.g., in [6]. There are two important parameters that characterize rf cavities: the accelerating gradient E acc and the unloaded quality factor Q 0 .…”

“…This quantity is defined as the distance of propagation over which radiation with spectral width ∆λ becomes 180 • out of phase. 6 The coherence time, defined by t coh ≡ L coh /c ∼ 1/∆ν, is much shorter than the pulse duration: t coh ≈ 0.3 fs.…”