Paper | Title | Other Keywords | Page |
---|---|---|---|
MOPO059 | Choke-Type Resonator for a Compact Storage Ring | cavity, storage-ring, ISOL, higher-order-mode | 126 |
|
|||
We present the results of calculations and measurements the electrodynamic characteristics of the operating and high order modes of a choke-type resonator, intended for a 35-50 MeV storage ring, which is part of the Thomson X-ray generator. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO059 | ||
About • | paper received ※ 09 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019 | ||
Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||
TUPO005 | Initial Beam Commissioning of LEAF at IMP | rfq, emittance, MMI, acceleration | 332 |
|
|||
A Low Energy intense-highly-charged ion Accelerator Facility (LEAF), which mainly includes an ECR ion source, LEBT and an 81.25 MHz RFQ, was designed to produce and accelerate heavy ions, from helium to uranium with A/Q between 2 and 7, to the energy of 0.5 MeV/u. The typical beam intensity is designed up to 2 emA CW for the uranium beam. The facility has been successfully commissioned with He+ (A/Q=4) and N2+ (A/Q=7) beams and accelerated the beams in the CW regime to the designed energy of 0.5 MeV/u. Beam properties and transmission efficiencies were measured, indicating a good consistency with simulated data. After having briefly recalled the project scope and parameters, this paper describes the beam commissioning strategy and detailed commissioning results. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO005 | ||
About • | paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019 | ||
Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||
TUPO012 | Compact Multipurpors Facility - BELA | rfq, linac, neutron, ion-source | 349 |
|
|||
In ITEP the project of multidiscipline facility Based on ECR ion source and Linear Accelerator (BELA) is started. The injector part of facility is based on combinations of ECR ion source and dc H+ and He+ source will provide the multi beams irradiation of the reactor materials for modeling experiments. The cw RFQ and following DTL will enable the set of experimental activity both for fun-damental physics and for practical applications. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO012 | ||
About • | paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019 | ||
Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||
TUPO033 | Cryogenic Test Results of the SPS Prototype RF-dipole Crabbing Cavity with Higher Order Mode Couplers | cavity, HOM, dipole, luminosity | 402 |
|
|||
The rf-dipole crabbing cavity planned for the LHC High Luminosity Upgrade is designed to deliver a transverse kick of 3.34 MV; crabbing the proton beam in the horizontal plane. The proton beams of the LHC machine operating at 7 TeV each sets high impedance thresholds on the crabbing cavity systems. The rf-dipole crabbing cavity is designed with a two higher order mode couplers to suppress those HOMs. The first prototype of the HOM couplers are fabricated at Jefferson Lab. This paper reports the cryogenic test results of the HOM couplers with the SPS prototype rf-dipole cavity. | |||
![]() |
Slides TUPO033 [0.859 MB] | ||
![]() |
Poster TUPO033 [1.838 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO033 | ||
About • | paper received ※ 17 September 2018 paper accepted ※ 09 November 2018 issue date ※ 18 January 2019 | ||
Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||
TUPO048 | Study Progress of Pulse Laser Annealing for Niobium Film on Copper | laser, niobium, experiment, cavity | 438 |
|
|||
Funding: Work supported by Major Research Plan of National Natural Science Foundation of China (No. 91026001). The recent studies of laser annealing on niobium films on copper are reported. Annealing is normally used to deal with the surface, reducing defects and even chang-ing the microstructure of the coating film. Short pulse laser can produce a sharp step temperature field on the film thickness scale (μm), which anneals the surface without substrate heated. The laser annealing experi-ments of niobium thin film sample have been carried out, and according to SEM and FIB results, Nb films melted and recrystallization occurred. Grains growing up can be observed while the power density of laser pulse in-creased. |
|||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO048 | ||
About • | paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019 | ||
Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||
TUPO065 | Improvement of Cavity Performance by Nitrogen Doping at KEK | cavity, SRF, accelerating-gradient, solenoid | 480 |
|
|||
Nitrogen doping experiments in single-cell and 3-cell niobium cavities were carried out at KEK. After annealing at 800 deg C for 3 hours, pure nitrogen gas with a pressure of 3 Pa for 20 minutes and 3 minutes were introduced for doping in a furnace in J-PARC, respectively. Removing surface in 5 um and 20 um by electropolishing were performed prior to the vertical tests, respectively. Increases of a quality factor at 2K and reduction of the BCS resistance with respect to an accelerating gradient were observed in both cavities. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO065 | ||
About • | paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019 | ||
Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||
TUPO073 | Niobium Sample Analysis for Nitrogen Infusion and Doping | cavity, niobium, vacuum, injection | 506 |
|
|||
KEK has been investigating the better conditions of the heat treatment in nitrogen, which are called as nitrogen doping and nitrogen infusion. We have tried to understand the high gradient performance of the cavity from the analyses of samples which were prepared in the same conditions for the cavity. The main tools are D-SIMS for the depth profile of the elemental concentration, XPS for composition analysis and SQUID magnetometry for the critical DC magnetic field measurement. The difference in the depth profiles of the nitrogen, carbon and oxygen between the heat treatment conditions was observed in vacuum and furnace temperature of nitrogen infusion by D-SIMS and XPS. Such a difference correlates with the vortex penetration field measured by SQUID. In particular, that of nitrogen doping sample was greatly degraded, while that of nitrogen infusion sample was slightly improved. The tendency is similar to the RF high gradient test results. Details of the sample analysis are shown in this presentation. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO073 | ||
About • | paper received ※ 18 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019 | ||
Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||
THPO050 | Research on the New Cavity Structure of RFQ Accelerator With Bent Vanes at IMP | rfq, cavity, simulation, impedance | 802 |
|
|||
A new cavity structure of RFQ accelerator with bent vanes is proposed to meet the miniaturization requirement of low frequency heavy ion accelerators at Institute of Modern Physics (IMP), Chinese Academy of Sciences. The new structure has a downsized cross section by bending vanes while keeping a certain vane lengths. It also possesses the advantages of simple cooling structure and high power efficient when used in low frequency. The new structure has obvious advantages in reducing manufacturing difficulty of cavity, cutting down project cost, enhancing facility reliability and stability. | |||
![]() |
Slides THPO050 [1.407 MB] | ||
![]() |
Poster THPO050 [0.398 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO050 | ||
About • | paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019 | ||
Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||
THPO126 | Compact H+ ECR Ion Source with Pulse Gas Valve | ion-source, plasma, extraction, GUI | 955 |
|
|||
We are developing a compact ECR H+ ion source with pulse gas valve. In the case of high current ion linac, the distance between the ion source and the first accelerating tube such as RFQ must be as short as possible to reduce the space charge effect, while operating in a high electric field a good vacuum condition is desirable. Since hydrogen gas always flows out from ion sources if the plasma chamber is filled with the gas, vacuum pumping systems have to evacuate the gas enough before the first accelerating tube. The pulse gas injection system achieved by a fast piezo gas valve can reduce the gas load on the vacuum evacuation system and is suitable for installing the ion source close to the RFQ. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO126 | ||
About • | paper received ※ 19 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019 | ||
Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||