Analysis of formulas used in coupling impedance coaxial-wire measurements for distributed impedances

Conference · Thu May 30 00:00:00 EDT 2002

OSTI ID:797852

De Santis, Stefano

In this paper we study the validity of coupling impedance bench measurements for distributed impedances, comparing the commonly used log formula to the result obtained applying a modified version of Bethe's theory of diffraction to a long slot in a coaxial beam pipe. The equations found provide a quantitative expression for the influence of the wire thickness used in the measurement of the real and imaginary part of the longitudinal impedance. The precision achievable in an actual measurement is therefore discussed. The method presented has also been applied in the presence of lumped impedances [1].

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Director, Office of Science (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 797852
• Report Number(s): LBNL-50480; CBP Note - 429; R&D Project: 455101; B& R KA0403011; TRN: US0202043
• Resource Relation: Conference: Eighth European Particle Accelerator Conference (EPAC 2002), Paris (FR), 06/03/2002--06/07/2002; Other Information: PBD: 30 May 2002
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
DIFFRACTION
IMPEDANCE
THICKNESS