Advanced Cryomodule Systems and Tuner Operations at TTC2025
Explore discussions on special cryomodules, stepper motor operations, and coupled cavities in advanced auxiliary systems at the Topical Session during TTC2025 in South Korea, addressing challenges and R&D plans for vibration reduction.
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Presentation Transcript
WG4:Topical Session on Special Cryomodules and Advanced Auxiliary Systems Convenors: Hongtao Hao (SARI) Crispin Contreras-Martinez (FNAL) Alan Wheelhouse (STFC) 9th April 10th April TTC2025 (Daejeon, South Korea 8th April 11th April)
Discussion Tuner (stepper motor and piezo actuator) RAON HWR stepper motor: vibrations from motor and slip in steps LCLS-II and Shine 3.9 GHz third harmonic cavities: The tuner response has different regions Availability of actuators EIC and LHC crab cavities HOM and FPC Crab cavity HOM coaxial feedthrough reliability Effects of transportation on the FPC 9th April 10th April TTC2025 (Daejeon, South Korea 8th April 11th April)
Tuner [with Phytron cryo stepper motor]operation Vibration(amplitude) measurements vs. operation setting motor speed motor pulse 1,000 pulse (micro)stepping 2,000 pulse 5000 1000 500 600 500 400 1/2 1/8 1/32 RAON setting: pulse(<1,000), speed(500), stepping(1/32) Observation/difficulties to use slow tuner @GDR Occasional slip observed on few tuners mechanical vibration, especially at the start/end of tuner operation - results in control lose due to a large ( f0/ ) - observed the vibration on cavities in the same cryomodule Tuner operation tests @SEL Plans: R&D to reduce the vibration including design changes 2025-04-08 Y.S. Chung Status of RAON Operational experience 3
Coupled Cavities C100-4 Cavities 4, 6, 7, 8 responding to an applied PZT step voltage change from 4 to 3 volts in cavity 5 Adjacent Cavity Adjacent Cavity coupling is ~ 10% coupling is ~ 10% between 1 between 1- -4 and 5 5- -8 cavities 8 cavities Cavity 5 PZT Cavity 5 PZT moved 460 Hz moved 460 Hz 4 and Cavity Gradients Cavity Gradients 10 MV/m 10 MV/m Locked in GDR Locked in GDR Mode Mode Cavities 4 and 5 Cavities 4 and 5 have a quasi have a quasi mechanical mechanical support between support between them. them. Klystron had the Klystron had the overhead to keep overhead to keep cavities locked cavities locked Ringing is the Ringing is the 21 Hz mechanical 21 Hz mechanical Mode Mode Stepper Motor Stepper Motor kicks in to tune kicks in to tune the cavities the cavities 4/19/2025 4
