| Paper |
Title |
Page |
| THP053 |
Simulations and Optimizations of a New Power Coupler for 3.9-GHz Superconducting Cavities at Fermilab
|
701 |
| |
- J. Li, I. G. Gonin, T. K. Khabiboulline, D. O. Olis, N. Solyak
Fermilab, Batavia, Illinois
- T. Wong
Illinois Institute of Technology, Chicago, Illinois
|
|
| |
3.9 GHz third harmonic superconducting cavities have been used to increase the peak bunch current and to compensate for non-linear distortions in the longitudinal phase space due to sinusoidal 1.3 GHz accelerating cavity voltage. The power coupler is one of the important and complicated components of the third harmonic system for the TTF3 project. From electromagnetic, multipacting, and thermal simulations of the power coupler, optimized designs have been achieved, enabling one to minimize or eliminate potential problems in advance. This paper presents our recent work on simulation and optimization of the power coupler.
|
|
| THP056 |
Design of 325-MHz Single and Triple Spoke Resonators at FNAL
|
707 |
| |
- I. G. Gonin, G. Apollinari, T. K. Khabiboulline, G. Lanfranco, G. Romanov
Fermilab, Batavia, Illinois
|
|
| |
We present the design of two 325 MHz superconducting single spoke resonators at β=0.22 and β=0.4 and a 325 MHz superconducting triple spoke resonator at β=0.62 for the front end of a 2 MW proton linac. We describe the optimization of the spoke resonator electromagnetic performance and how the resonator structural integrity and shape is ensured. We describe the mechanical design of the slow tuner mechanism and, via a coupled ANSYS-MWS analysis, how the mechanism adjusts the resonator operating frequency. The RF design of the power coupler is also presented
|
|
| THP057 |
Design of Normal Conducting 325-MHz Crossbar H-Type Resonators at Femirlab
|
710 |
| |
- L. Ristori, I. G. Gonin, T. K. Khabiboulline, G. Romanov
Fermilab, Batavia, Illinois
|
|
| |
The warm section of the proposed High Intensity Neutrino Source at Fermilab is designed to accelerate H- ions and protons from 2.5 MeV to 10 MeV (β=0.0744 to β=0.1422). After the ion source, the beam will travel through a radio frequency quadrupole, a medium energy beam transport (two buncher cavities and a chopper) and finally 16 normal-conducting resonators, all separated by superconducting solenoids in individual cryostats. Over 10 MeV the design uses superconducting resonators and solenoids in common cryomodules. In this paper the electromagnetic design and optimization of all the 325 MHz Crossbar H-type normal-conducting resonators is presented. The mechanical design, performance and fabrication of the first prototype (β=0.0744) is presented in detail. The design of the prototype for the input coupler that will be used in the resonators is included.
|
|
| THP061 |
High Field Test Results of Superconducting 3.9-GHz Accelerating Cavities at FNAL
|
722 |
| |
- N. Solyak, H. Edwards, M. Foley, I. G. Gonin, T. K. Khabiboulline, D. V. Mitchell, A. M. Rowe
Fermilab, Batavia, Illinois
|
|
| |
The XFEL facilities are planning to use section with a few third harmonic cavities (3.9GHz) to improve beam performance [1]. Fermilab is developing superconducting third harmonic section for the FLASH(TTF/DESY) upgrade. This section will include four cavities equiped with couplers and blade tuners installed in cryostat. Up to now, two cavities are completed and one of them is under vertical test. The gradient of the cavity was limited by multipactor in HOM coupler. The visual inspection of the HOM couplers after cold tests showed that both couplers were damaged. In paper we discuss the results of vertical tests, multipactoring analysis in HOM coupler and a new design for HOM coupler.
|
|
| THP076 |
Prototyping of a Superconducting Elliptical Cavity for a Proton Linac
|
758 |
| |
- W. Hartung, J. Bierwagen, S. Bricker, C. Compton, T. L. Grimm, M. J. Johnson, D. Meidlinger, J. Popielarski, L. Saxton, R. C. York
NSCL, East Lansing, Michigan
- G. W. Foster, I. G. Gonin, T. K. Khabiboulline, N. Solyak, R. Wagner, V. Yarba
Fermilab, Batavia, Illinois
- P. Kneisel
Jefferson Lab, Newport News, Virginia
|
|
| |
A superconducting cavity has been designed for acceleration of particles travelling at 81% the speed of light (β = 0.81). Possible applications include the proposed Fermilab Proton Driver Linac. The cell shape is similar to the β = 0.81 cavity for the Spallation Neutron Source Linac, but the resonant frequency is 1.3 GHz rather than 805 MHz and the beam tube diameter matches that of the 1.3 GHz cavity for the TeSLA Test Facility. Six single-cell prototypes are being fabricated and tested. Three of these cavities are being formed from standard high purity fine grain niobium sheet. The rest are being fabricated from large grain niobium, following up on the work at Jefferson Lab to investigate the potential of large grain material for cost savings and/or improved RF performance. The fabrication of two 7-cell cavity prototypes (one fine grain, one large grain) is planned. A status report on this prototyping effort will be presented.
|
|