Design, Fabrication and Measurement of the First Rounded Damped Detuned Accelerator Structure (RDDS1)

Wang, Juwen

doi:10.2172/764985

Cited by 6 publications

(6 citation statements)

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“…The result of these two efforts produced structures with frequencies that matched design to better than 1 MHz. As a consequence, the long-range wakefield that was measured agrees well with prediction [21].…”

Section: Wakefield Suppressionsupporting

confidence: 84%

Summary of the Rf Technology Working Group (T3).

Adolphsen¹,

Cornuelle²,

Lavine³

et al. 2002

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The Next-generation Linear Collider The next-generation linear collider will require high-power microwave sources and accelerating systems vastly more challenging than its predecessor, the Stanford Linear Collider (SLC). Cost efficiency will demand high accelerating gradient to achieve beam energies five to ten times greater than in the SLC. Luminosity goals 10,000 times greater than the SLC demand efficient creation of the highest possible beam power without degradation of beam emittance. The past decade of R&D has demonstrated the feasibility of two technical approaches for building a 500-GeV center-of-mass system (cms) collider with attractive options for future upgrade. The TESLA R&D program offers the prospect of 1.3-GHz superconducting rf (srf) linacs with 23.4 MV/m gradient that can be upgraded later to 35 MV/m gradient by doubling the number of klystrons and the cryo-plant, to reach 800 GeV cms [1]. The Next Linear Collider (NLC) and Japanese Linear Collider (JLC) R&D programs offer the prospect of 11.4-GHz room-temperature linacs that can later be extended to 1 TeV by doubling the number of structures and klystrons, and to 1.5 TeV by additionally increasing gradient or length [2-4]. Both programs offer a 500-GeV linear collider project start within the next few years (2-3 years for TESLA, 3-4 years for NLC) based on available technology validated by experiments at several complementary test facilities. Both offer their upgrades as a result of further progress in R&D that is already underway. While both the 1.3-and 11.4-GHz approaches use klystrons to generate the accelerator rf power, a longer-range design study for a two-beam accelerator, the CERN Linear Collider (CLIC), is based on the concept of using klystrons to accelerate a low-energy drive beam that is subsequently compressed and de-accelerated to generate power at 30

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Section: Wakefield Suppressionsupporting

confidence: 84%

Summary of the Rf Technology Working Group (T3).

Adolphsen¹,

Cornuelle²,

Lavine³

et al. 2002

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“…This long-range wakefield control has been studied in detail and four damped-detuned accelerator structures (DDS) have been built with the most recent structure using rounded cells. Measurements of the rf properties of the structures [14,15] have confirmed: (1) the cell fabrication techniques which can achieve sub-MHz accuracy, (2) the wakefield models and wakefield suppression techniques, (3) the rf BPMs which are necessary to align the structures to the beam and prevent emittance dilution, and (4) the rf design codes which have sub-MHz accuracy [16]. Because of this previous experience, we are confident that it will be straight-forward to include the long-range wakefield control after the gradient performance is verified.…”

Section: Accelerator Structuresmentioning

confidence: 99%

Overview of the X-band R& D Program

Raubenheimer¹

2002

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An electron/positron linear collider with a center-of-mass energy between 0.5 and 1 TeV is recognized as an important complement to the physics program of the LHC. The Next Linear Collider (NLC) is being designed by a US collaboration (FNAL, LBNL, LLNL, and SLAC) which is working closely with the Japanese collaboration that is designing the Japanese Linear Collider (JLC). The NLC/JLC main linacs are based on normal conducting 11 GHz rf. This paper will discuss the status of the NLC design. Results from the ongoing R&D programs, including the recently uncovered high gradient damage problem, will be discussed along with changes to the optical design and collider layout which were made to enhance the collider capabilities.

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“…Measurements of the rf properties of the structures [12,13] have confirmed: (1) the cell fabrication techniques which can achieve sub-MHz accuracy, (2) the wakefield models and wakefield suppression techniques, (3) the rf BPMs which are necessary to align the structures to the beam and prevent emittance dilution, and (4) the rf design codes which have sub-MHz accuracy [14].…”

Section: Accelerator Structuresmentioning

confidence: 99%

“…More recently, many of the component prototypes have returned results that are better than the initial specifications. For example, if the rf structure BPMs perform as measured in the DDS3 and RDDS1 structures [12,13], the emittance dilution due to wakefields would decrease from the allocated 150% to less than 25%. At this time, we are very confident that the collider will exceed the design goals and we will update the parameter sets based on the results of the ongoing R&D programs while maintaining sufficient operational flexibility to ensure that the luminosity goals are met.…”

Section: Luminositymentioning

confidence: 99%

Progress With the JLC/NLC X-Band Linear Collider Design

Raubenheimer

2001

Int. J. Mod. Phys. A

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An electron/positron linear collider with a center-of-mass energy between 0.5 and 1 TeV would be an important complement to the physics program of the LHC in the next decade. The Next Linear Collider (NLC) is being designed by a US collaboration (FNAL, LBNL, LLNL, and SLAC) which is working closely with the Japanese collaboration that is designing the Japanese Linear Collider (JLC). The NLC main linacs are based on normal conducting 11 GHz rf. This paper will discuss the technical difficulties encountered as well as the many changes that have been made to the NLC design over the last year. These changes include improvements to the X-band rf system as well as modifications to the injector and the beam delivery system. They are based on new conceptual solutions as well as results from the R&D programs which have exceeded initial specifications. The net effect has been to reduce the length of the collider from about 32 km to 25 km and to reduce the number of klystrons and modulators by a factor of two. Together these lead to significant cost savings.

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Design, Fabrication and Measurement of the First Rounded Damped Detuned Accelerator Structure (RDDS1)

Cited by 6 publications

References 0 publications

Summary of the Rf Technology Working Group (T3).

Summary of the Rf Technology Working Group (T3).

Overview of the X-band R& D Program

Progress With the JLC/NLC X-Band Linear Collider Design

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