Title :
Test operation of ball-screw-type tuner for low-los high-gradient superconducting cavity at 77 K
Author :
Higo, T. ; Higashi, Y. ; Araoka, O. ; Furuta, F. ; Morozumi, Y. ; Saeki, T. ; Saito, K. ; Ueno, K. ; Wake, M. ; Yamaoka, H.
Author_Institution :
KEK, Tsukuba
Abstract :
Super-conducting Radio Frequency (SRF) 9-cell cavities have been developed in Low-Loss (LL) ICHIRO shape at KEK aiming at high-gradient operation for the International Linear Collider (ILC). One of the most important issues to realize high-gradient linac with SRF cavitiest in pulsed-mode operation is the compensation of the Lorentz detuning of cavities which amounts to 3 kHz at our goal of 45 MV/m acceleration field. None of tuners to date have achieved this specification. A coaxial ball- screw tuner was designed, fabricated and proven to reach this specification in room temperature. The performance was studied also at liquid-nitrogen temperature and the needed dynamic-range for 45 MV/m operation was proven at this temperature. The microphonic vibration was measured to be 100 Hz order in a test setup. In this paper, we describe these studies and evaluate the feasibility of ball-screw tuner operation at 2 K.
Keywords :
accelerator RF systems; accelerator cavities; linear colliders; superconducting cavity resonators; International Linear Collider; Lorentz detuning; Low-Loss ICHIRO; SRF cavities; Super-conducting Radio Frequency 9-cell cavities; ball-screw-type tuner; feasibility; frequency 100 Hz; high-gradient linac; liquid-nitrogen temperature; microphonic vibration; pulsed-mode operation; temperature 2 K; temperature 293 K to 298 K; temperature 77 K; Acceleration; Coaxial components; Fasteners; Linear particle accelerator; Radio frequency; Shape; Temperature; Testing; Tuners; Vibration measurement;
Conference_Titel :
Particle Accelerator Conference, 2007. PAC. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0916-7
DOI :
10.1109/PAC.2007.4441164
