NCRF and SRF RD Needs and Priorities for the Next 3-5 Years

Muon collider RF system overview 2 • Complex and prevailing in the Muon collider, from the start of the proton driver to the final collider ring.• Versatile functions: acceleration, ionization cooling, longitudinal beam manipulation, etc. • Broad range of operation conditions: NCRF and SRF, frequency from dozens of MHz to a few GHz, gradients up to 30+ MV/m, etc. • Unique features: strong magnetic field background, enclosed cavity apertures, gas-filled, muon decays, very high bunch intensity etc. 4 2/23/24 Luo | NCRF R&D needs and priorities for the next 3-5 years Recent achievements: 650 MHz 2/23/24 Belomestnykh | SRF R&D needs and priorities for the next 3-5 years 14 No field emission!P r e l i m i n a r y Large error bars!P r e l i m i n a r y • Single-cell HB650 (PIP-II shape) 650 MHz cavity has reached 54.8 MV/m (preliminary result) after modified EP recipe and low-temperature bake • Very promising result, but very large error bars.The cavity will be re-tested with improved setup to reduce error bars Key R&D priorities.