Abstract:
The LCLS II project make used of use of state of the art superconducting cryo-modules RF powered in CW mode by dedicated TTF3 style FPCs. The talk will provide details related with LCLS-II cryo-module production experience at JLAB using this type of couplers.
Provocative topic:
The modified TTF3 is a complex coupler, I wished it was simpler. Will this coupler demonstrate...
Abstract:
We discuss the behavior of the 1.2 MW power couplers on the ESS medium beta elliptical cavities cryomodule during high power test in the Saclay test bunker. We go through three test conditions, room temperature, cold with detuned cavity and with the nominal case of tuned cavities at 2 Kelvin.
Provocative topic:
Do we condition FPC enough?
Abstract
RF power couplers for QWR and HWR cavity are under the mass production in RISP. We will present the technical issues which occurred during the preparation and test of the RF power couplers. The contamination of the coupler is occurred after the ultra-sonic cleaning (USC) with the DI-water. The USC procedure of the coupler is modified as replacing the DI-water to the ethanol. The...
Abstract:
Two types of crab cavities will be installed into the LHC as part of the HL-LHC project. To mitigate the problems of large beam-induced heat-loads and instabilities, the higher order modes in both cavities are damped by coaxial couplers. This presentation will detail the HOM damping mechanisms chosen, specifically looking into broad-band damping and limitations with dynamic heat...
Abstract:
To compensate for SRF cavity Lorentz Force Detuning fast/piezo actuator must operate at high amplitude and high dynamic rate. The piezo-actuator when operated inside insulate vacuum environment with pulses of large amplitude could be overheated quickly. Uncontrollable increase of the piezo actuator temperature could lead to the failure of the actuator, as reported in many papers....
Provocative topics:
Mechanical modes integrated with a pneumatic tuner, magnetic hygiene with a pneumatic tuner, use of 'industrial-class' proportional solenoid valves for large-scale SRF accelerators
Abstract:
The talk will address the positive and negative experiences that RI gained during the production of FPC in large scale series (E-XFEL, LCLS-II) and small scale projects. The most critical processes and head-aches will be reflected from “behind the scenes”.
The specifications do often cut the edge of achievable copper plating, TIN deposition and mechanical tolerances in a serial...
