The European Spallation Source Design

The proposed 8 GeV proton driver (PD) linac at FNAL is based on 436 independently phased superconducting (SC) resonators (Foster and MacLachlan 2002 Proc. LINAC-2002 p 826). The linac includes a front end up to ~420 MeV and a high energy section operating at 325 and 1300 MHz respectively. A room temperature (RT) radio frequency quadrupole (RFQ) and short H-type resonators are proposed for the initial acceleration of the H-minus or proton beam up to 10 MeV. From 10 to ~420 MeV the voltage gain is provided by SC spoke-loaded cavities. In the high-energy section, the acceleration is provided by the International Linear Collider (ILC)-style SC elliptical cell cavities. The beam physics and the lattice design for the FNAL 8 GeV linac are discussed in this paper.

https://iopscience.iop.org/article/10.1088/1367-2630/8/11/281/pdf

Physics design of the 8?GeV H-minus linac

In the last decades several types of H-mode cavities have been developed for a wide range of applications. Several drift tube cavities (IH-structure) are in routine operation [1][2]. At the IAP (University of Frankfurt, Germany) a new type of H-mode cavity, the Cross-Bar-H-mode or CH-structure is presently under development. This multicell drift tube cavity is operated in the H21(0)-mode. The CH-structure is an excellent candidate for high power proton accelerators in the energy range from 3 to 100 MeV. We present the status of the room temperature (r.t.) CHcavity development for a dedicated 70 MeV proton injector for the international accelerator facility FAIR at GSI [3]. Due to its mechanical rigidity this cavity can be realized not only for room temperature but also for superconducting (s.c.) operation. To prove the very promising properties of superconducting CH-structures obtained by simulations, a 352 MHz prototype CH-cavity has been designed. Presently, this cavity is in the final stage of production. We present recent results of the s.c. cavity development and different applications which could take advantage of the s.c. CH-structure (XADS, IFMIF, cw-linac for the production of superheavy elements).

/pdf/development-of-room-temperature-and-superconducting-ch-14c5funil4.pdf

Development of room temperature and superconducting ch-structures

The proposed 8-GeV driver at FNAL is based on approximately 400 independently phased superconducting resonators. In this paper the design of 325 MHz spoke resonators, two single spoke resonators (beta = 0.21 and beta = 0.4) and a triple spoke resonator (beta = 0.62), for the high intensity neutrino source (HINS) front end is presented. We describe the optimization of the spoke resonator geometry, the goal being to minimize the EPEAK/EACC and BPEAK/EACC ratios. We report on the coupled ANSYS-MWS analysis on the resonator mechanical properties and power coupler RF design. The current status of mechanical design and slow tuning mechanism are also presented.

/pdf/design-of-325-mhz-single-and-triple-spoke-resonators-at-fnal-1d3zbn4bij.pdf

Design of 325 MHz Single and Triple Spoke Resonators at FNAL

The proposed 8-GeV driver at FNAL is based on approximately 400 independently phased SC resonators. In this paper the design of 325 MHz Spoke Resonators, two single spoke resonators ({beta}=0.22 and {beta}=0.4) and a triple spoke resonator ({beta}=0.62), for the High Intensity Neutrino Source (HINS) front end is presented. We describe the optimization of the spoke resonators geometry, the goal being to minimize the E{sub peak}/E{sub acc} and B{sub peak}/E{sub acc} ratios. We report on the coupled ANSYS-MWS analysis on the resonators mechanical properties and power coupler RF design. The current status of mechanical design, slow tuning mechanism and cryostat are also presented.

/pdf/design-of-325-mhz-single-and-triple-spoke-resonators-at-fnal-ceib9fmgrq.pdf

Design of 325 MHz single and triple spoke resonators at FNAL

Two /spl beta/ = 0.175, 350 MHz, 2-gap superconducting (SC) spoke cavities were fabricated in industry under the Advanced Accelerator Applications (AAA) project for the transmutation of nuclear waste. These cavities are promising candidates for the accelerating structures between a RFQ and the elliptical SC cavities for proton and heavy ion linacs. Since their delivery in July 2002, they have been tested in terms of mechanical properties, low-temperature performance, i.e., Q/sub 0/-E/sub acc/ curves at 4 K and 2 K, surface resistance dependence on temperature and for multipacting (MP). The two cavities achieved accelerating fields of 13.5 MV/m and 13.0 MV/m as compared to the required field of 7.5 MV/m with enough margin for the quality factor. These cavities seem to need more time to condition away MP than elliptical cavities, but MP does not occur once the cavity is conditioned and kept at 4 K. The length of the 103 mm-diameter nominal coupler port was found to be too short for the penetrating field.

https://digital.library.unt.edu/ark:/67531/metadc935413/m2/1/high_res_d/976645.pdf

Results of two LANL /spl beta/ = 0.175, 350-MHz, 2-gap spoke cavities

Two 350-MHz β = 0.175 two-gap superconducting (SC) spoke resonator cavities have been fabricated in industry under an R&D project for the Advanced Accelerator Applications (AAA) program at LANL. This paper describes the structure, presents the test results of mechanical properties, tuning sensitivity at room temperature, and Q – E curves at 4 K. A maximum accelerating field of 11.6 MV/m has been obtained, which exceeds our present goal of 7.5 MV/m with ample margin.

https://epaper.kek.jp/l02/papers/mo479.pdf

Test results of the lanl 350 mhz, beta=0.175, 2-gap spoke resonator*

The new vessel complex for the RFX-mod2 experiment: An effective synergy between fusion research and technological development

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

G. Corniani

Author Tools

Chat about Author

Papers

Results of two LANL /spl beta/ = 0.175, 350-MHz, 2-gap spoke cavities

Test results of the lanl 350 mhz, beta=0.175, 2-gap spoke resonator*

The new vessel complex for the RFX-mod2 experiment: An effective synergy between fusion research and technological development