Performance of a CEBAF production cavity after high-temperature heat treatment

Author

Kneisel, P. ; Rao, M.G.

Author_Institution

Continuous Electron Beam Accel. Facility, Newport News, VA, USA

fYear

1993

fDate

17-20 May 1993

Firstpage

927

Abstract

CEBAFs production cavities are tested in a vertical configuration after appropriate chemical surface treatment prior to installation into the accelerator. The performance of these cavities is excellent often exceeding the specifications of E_acc=5 MV/m at 2 K by factors of 2 to 3. In such cases the cavities are often limited by thermal-magnetic breakdown. A cavity that exhibited a limiting gradient of E_acc⩽16.4 MV/m has been heat-treated at 1400°C for 6 hours in the presence of titanium as a solid state gettering material to improve the thermal stability of the niobium. After the heat treatment a gradient of E_acc=20.5 MV/m corresponding to a peak surface electric field of E_peak=52 MV/m has been measured. In addition to the cavity results, data on thermal conductivity and tensile properties of samples which have undergone the same treatments as the cavity are reported

Keywords

beam handling equipment; cavity resonators; electron accelerators; getters; heat treatment; linear accelerators; 1400 C; 2 K; 6 h; CEBAF production cavity; Nb; Nb thermal stability; Ti; chemical surface treatment; high-temperature heat treatment; limiting gradient; peak surface electric field; solid state gettering material; tensile properties; thermal conductivity; thermal-magnetic breakdown; vertical configuration; Chemical products; Electric breakdown; Gettering; Life estimation; Production; Solid state circuits; Surface treatment; Testing; Thermal conductivity; Titanium;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1993., Proceedings of the 1993

Conference_Location

Washington, DC

Print_ISBN

0-7803-1203-1

Type

conf

DOI

10.1109/PAC.1993.308727

Filename

308727