Performance limiting effects in X -band accelerators

Acceleration gradient is a critical parameter for the design of future TeV-scale linear colliders. The major obstacle to higher gradient in room-temperature accelerators is rf breakdown, which is still a very mysterious phenomenon that depends on the geometry and material of the accelerator as well...

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Bibliographic Details
Published in:Physical review special topics. PRST-AB. Accelerators and beams 2011, Vol.14 (1), p.010401, Article 010401
Main Authors: Wang, Faya, Adolphsen, Chris, Nantista, Christopher
Format: Article
Language:English
Subjects:
Accelerators
Breakdown
Constraining
Damage
Design parameters
Electric fields
Experiments
Heating
High temperature effects
Magnetic fields
Room temperature
Standing waves
Superhigh frequencies
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Summary:Acceleration gradient is a critical parameter for the design of future TeV-scale linear colliders. The major obstacle to higher gradient in room-temperature accelerators is rf breakdown, which is still a very mysterious phenomenon that depends on the geometry and material of the accelerator as well as the input power and operating frequency. Pulsed heating has been associated with breakdown for many years; however, there have been no experiments that clearly separate field and heating effects on the breakdown rate. Recently, such experiments have been performed at SLAC with both standing-wave and traveling-wave structures. These experiments have demonstrated that pulsed heating is limiting the gradient. Nevertheless the X -band structures breakdown studies show damage to the iris surfaces in locations of high electric field rather than of high magnetic field after thousands of breakdowns. It is not yet clear how the relative roles of electric field, magnetic field, and heating factor into the damage caused by rf breakdown. Thus, a dual-moded cavity has been designed to better study the electric field, magnetic field, and pulsed heating effects on breakdown damage.
ISSN:1098-4402
1098-4402
2469-9888
DOI:10.1103/PhysRevSTAB.14.010401