Analysis and measurement of the transfer matrix of a 9-cell, 1.3-GHz superconducting cavity

Abstract

Superconducting linacs are capable of producing intense, stable, high-quality electron beams that have found widespread applications in science and industry. The 9-cell 1.3-GHz superconducting standing-wave accelerating RF cavity originally developed for e + /e − linear-collider applications [B. Aunes, et al. Phys. Rev. ST Accel. Beams 3, 092001 (2000)] has been broadly employed in various superconducting-linac designs. In this paper we discuss the transfer matrix of such a cavity and present its measurement performed at the Fermilab Accelerator Science and Technology (FAST) facility. The experimental results are found to be in agreement with analytical calculations and numerical simulations.

Record high-gradient SRF beam acceleration at Fermilab

“…Besides this main goal, we plan to continue exploration of the SRF system performance with full ILC-type beam pulse specifications, such as 5 Hz repetition rate and up to 1 ms beam pulse length. The facility is also capable to supporting a broad spectrum of advanced beam studies and experiments [47,48]. In particular, it will be quite suitable for the beam tests of a number of novel methods to further significantly increase the accelerating gradients up to 90 MV m −1 in pulsed SRF cavities, such as those now actively developed, using of Nb 3 Sn rather than pure Nb cavities [49][50][51] or based on impurity addition to the cavity surface or layered structures of insulating and superconducting films [52,53].…”

Transverse diagnostics based on dipole mode signal fitting method in TESLA-type accelerating cavities at the free-electron laser FLASH

“…In this case, the beam trajectory between the two BPMs is not a straight line anymore. According to the transport matrices for rf cavities [25], the beam trajectory in the TESLA cavities is very close to a straight line due to the high beam energy (about 550 MeV). In order to prove the reading of the HOMBPMs in this case, we made linear scans in the horizontal and vertical plane respectively.…”

Nishikawa Prize article: Electron lenses, Tevatron, and selected topics in accelerators

“…That accomplishment greatly boosted the confidence in the technical feasibility of the ILC-the supercollider project to push elementary particle physics beyond the LHC and which is now under serious consideration by the Japanese government. The FAST linac was also commissioned as an electron injector to IOTA ring and already supports user research [68]. Of note here is that my involvement in the linear colliders' R&D began in the 1990s back in Russia and at DESY and, e.g., I was part of the group which for the first time demonstrated nanosecond-scale HV pulse (∼5 kV, high rep rate) traveling wave injection and extraction kickers for multibunch storage rings and other accelerator applications [69], thus paving the way to many modern pulsed nanosecond HV systems based on MOSFETs, fast ionization devices (FIDs), and other fast switches and allowing one to shorten the circumference of the damping rings of the future e þ e− linear colliders from 10-20 km to about 3 km.…”