Effect of RF Parameters on Breakdown Limits in High-Vacuum X-Band Structures

Technical Report · Mon Sep 22 04:00:00 EDT 2003

DOI:https://doi.org/10.2172/815741· OSTI ID:815741

Dolgashev, Valery A ^[1]

---

1. SLAC

RF breakdown is one of the major factors determining performance of high power rf components and rf sources. RF breakdown limits working power and produces irreversible surface damage. The breakdown limit depends on the rf circuit, structure geometry, and rf frequency. It is also a function of the input power, pulse width, and surface electric and magnetic fields. In this paper we discuss multi-megawatt operation of X-band rf structures at pulse width on the order of one microsecond. These structures are used in rf systems of high gradient accelerators. Recent experiments at Stanford Linear Accelerator Center (SLAC) have explored the functional dependence of breakdown limit on input power and pulse width. The experimental data covered accelerating structures and waveguides. Another breakdown limit of accelerating structures was associated with high magnetic fields found in waveguide-to-structure couplers. To understand and quantify these limits we simulated 3D structures with the electrodynamics code Ansoft HFSS and the Particle-In-Cell code MAGIC3D. Results of these simulations together with experimental data will be discussed in this paper.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (US)
• Sponsoring Organization: USDOE Office of Science (US)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 815741
• Report Number(s): SLAC-PUB-10175
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
BREAKDOWN
ELECTRODYNAMICS
FUNCTIONALS
GEOMETRY
MAGNETIC FIELDS
PERFORMANCE
RF SYSTEMS
STANFORD LINEAR ACCELERATOR CENTER
WAVEGUIDES