Conveners
C1OrE - Superconducting RF Systems
- Thomas Nicol (FNAL)
- Vincent Roger (FNAL)
The European X-ray Free Electron Laser (XFEL) is under commissioning at DESY. The superconducting XFEL linac will produce pulsed electron beam with energy of 17.5 GeV. The linac consist of 800 superconducting niobium 1.3 GHz nine cell cavities and 100 superconducting magnet packages assembled in 100 cryomodules. Each cryomodule has 12 m length and includes the 2K helium II bath circuit for the...
The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL) is preparing for the Proton Power Upgrade (PPU) project to increase the output energy of the accelerator from 1.0 GeV to 1.3 GeV. As part of this project with the combination of increasing the output energy and beam current, the beam power capability will be doubled from 1.4MW to 2.8MW. In this project, seven new high...
Fermilab’s 1.3 GHz prototype cryomodule for the Linac Coherent Light Source Upgrade (LCLS-II) has been tested at Fermilab’s Cryomodule Test Facility (CMTF). Aspects of the cryomodule design have been studied and tested. The cooldown circuit was used to quickly cool the cavities through the transition temperature, and a heater on the circuit was used to heat incoming helium for warmup. Due...
This paper describes the initial operational experience gained from testing Linac Coherent Light Source II (LCLS-II) cryomodules at Fermilab’s Cryomodule Test Facility (CMTF). Strategies for a controlled slow cooldown to 100K and a fast cooldown past the niobium superconducting transition temperature of 9.2K will be described. The test stand for the cryomodules at CMTF is sloped to match...
Thermoacoustic Oscillations (TAOs) are a well known phenomenon in cryogenics and in most cases is an undesirable effect. During LCLS-II prototype Cryomodule testing, TAOs were observed in both the Cryogenics Distribution System and in the LCLS-II Cryomodule JT and Cooldown Valves. The TAOs manifested themselves through the usual effect of added heat load to the cryogenic system and ice...