| Paper | Title | Page |
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WEYA06 |
Superconducting Twin-axis Cavity for ERL Applications | |
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| The elliptical twin-axis cavity is a new kind of superconducting cavity that consists of two parallel beam pipes, which can accelerate or decelerate two beams in two separate beam pipes. The new cavity geometry is intended to create a uniform accelerating or decelerating fields for both beams. The twin-axis cavity can offer advantages in low-energy ERL applications by allowing increased bunch charge while preserving emittance. A 1.5 GHz superconducting twin-axis cavity has been designed, developed, fabricated, and tested. Experimental results will be presented. | ||
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Slides WEYA06 [7.061 MB] | |
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| MOPB035 | Cryogenic Probe Station at Old Dominion University Center for Accelerator Science | 128 |
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| With a growing effort in research and development of an alternative material to bulk Nb for a superconducting radiofrequency (SRF) cavity, it is important to have a cost effective method to benchmark new materials of choice. At Old Dominion University's Center for Accelerator Science, a cryogenic probe station (CPS) will be used to measure the response of superconductor samples under RF fields. The setup consists of a closed-cycle refrigerator for cooling a sample wafer to a cryogenic temperature, a superconducting magnet providing a field parallel to the sample, and DC probes in addition to RF probes. The RF probes will extract a quality factor from a sample patterned in a coplanar waveguide resonator structure on a 2' wafer. From the measured quality factor, the surface resistance and the penetration depth as a function of temperature and magnetic field will be calculated. This paper will discuss the design and measurement procedures of the current CPS setup. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB035 | |
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| TUPB053 | Lessons Learned from RF-Dipole Prototype Cavities for LHC High Luminosity Upgrade | 506 |
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| The rf-dipole cavity has successfully demonstrated the principles of using a compact cavity operating in TE11-like mode in generating a transverse kick. Several proof-of-principle rf-dipole cavities have been fabricated and the rf tests have demonstrated high transverse gradients. The rf-dipole geometry has been adapted into a square-shaped geometry designed to meet the dimensional constraints for the LHC also maintaining crabbing in both horizontal and vertical planes. Recently, two prototype rf-dipole cavities intended for the test at SPS for have been completed that is designed to accommodate the FPC and HOM dampers. The performance during the rf tests have shown excellent results on achieving the design requirements of operation for the crab cavities for SPS. This paper presents the experiences and lessons learned during the cavity preparation and testing, including process validation, frequency tracking. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB053 | |
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| TUPB054 | RF Tests of RF-Dipole Prototype Crabbing Cavities for LHC High Luminosity Upgrade | 509 |
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| The superconducting rf-dipole crabbing cavity is one of the two crabbing cavity designs proposed for the LHC high luminosity upgrade. The proof-of-principle (P-o-P) rf-dipole cavity operating at 400 MHz has demonstrated performance exceeding the design specifications. The prototype cavity for SPS beam test has been designed to include the fundamental power coupler, HOM couplers, and all the ancillary components intended to meet the design requirements. The crab cavities will be installed in the SPS beam line prior to the installation in LHC; this will be the first crabbing cavity operation on a proton beam. The fabrication of two prototype rf-dipole cavities is currently being completed at Jefferson Lab. This paper presents the details on cavity processing and cryogenic test results of the rf-dipole cavities. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB054 | |
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| THPB080 | Measurement of Frequency, Temperature, RF Field Dependent Surface Resistance Using Superconducting Half Wave Cavity | 925 |
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| A theory of surface resistance of superconductor was rigorously formulated by Bardeen, Cooper, Schrieffer more than 50 years ago. Since then the accelerator community has been used the theory as a guideline to improve the surface resistance of the superconducting cavity. It has been observed that the surface resistance is dependent on frequency, temperature and rf field strength, and surface preparation. To verify these dependences, a well-controlled study is required. Although many different types of cavities have been tested, the typical superconducting cavities are built for specific frequencies of their application. They do not provide data other than at its own frequency. A superconducting half wave cavity is a cavity that enables us to collect the surface resistance data across frequencies of interest for particle accelerators and evaluate preparation techniques. This paper will present the design of the half wave cavity, its electromagnetic mode characteristics and experimental results. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-THPB080 | |
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