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Title: Development of a 50 MW Multiple Beam Klystron

Abstract

The goal of this program was to develop a 50 MW, multiple beam klystron at 11.424 GHz. The device uses eight electron guns and beam lines to achieve the required power level at a beam voltage of 190 kV, consistent with solid state power supplies. The electron gun operates with confined flow focusing, which is unique among current multiple beam sources, and allows operation at power levels consistent with producing 10s of MWs of pulsed RF power. The circuit consists of a ring resonator input cavity, eight sets of buncher cavities, and a ring resonator output cavity. The RF output power is coupled into four rectangular waveguides equally spaced around the klystron. Eight individual collectors absorb the spent beam power in each beam. The klystron operates in a solenoid. The principle challenges in the design included development of the beam optics using confined flow focusing, shaping of the magnetic field in the gun region to avoid beam spiraling, coupling input power equally to all eight beam lines from a single input, and obtaining the required frequency and Q in the output cavity. The mechanical design was particularly complex due to the large parts count, number of braze and weld joints,more » and close proximity of the beam lines that limited access. Addressing vacuum leaks and cold testing the complex structures was particularly troublesome. At the conclusion of the program, the klystron is experiencing several vacuum leaks that are under repair. Efforts will continue to seal and test the klystron.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Calabazas Creek Research, Inc.
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
918831
Report Number(s):
DOE/ER83827-Final Report
DOE Contract Number:  
FG02-03ER83827
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; multiple beam klystron, klystron, RF, accelerator, collider, mbk

Citation Formats

Ives, R Lawrence, Ferguson, Patrick, Read, Michael, and Collins, George. Development of a 50 MW Multiple Beam Klystron. United States: N. p., 2007. Web. doi:10.2172/918831.
Ives, R Lawrence, Ferguson, Patrick, Read, Michael, & Collins, George. Development of a 50 MW Multiple Beam Klystron. United States. doi:10.2172/918831.
Ives, R Lawrence, Ferguson, Patrick, Read, Michael, and Collins, George. Wed . "Development of a 50 MW Multiple Beam Klystron". United States. doi:10.2172/918831. https://www.osti.gov/servlets/purl/918831.
@article{osti_918831,
title = {Development of a 50 MW Multiple Beam Klystron},
author = {Ives, R Lawrence and Ferguson, Patrick and Read, Michael and Collins, George},
abstractNote = {The goal of this program was to develop a 50 MW, multiple beam klystron at 11.424 GHz. The device uses eight electron guns and beam lines to achieve the required power level at a beam voltage of 190 kV, consistent with solid state power supplies. The electron gun operates with confined flow focusing, which is unique among current multiple beam sources, and allows operation at power levels consistent with producing 10s of MWs of pulsed RF power. The circuit consists of a ring resonator input cavity, eight sets of buncher cavities, and a ring resonator output cavity. The RF output power is coupled into four rectangular waveguides equally spaced around the klystron. Eight individual collectors absorb the spent beam power in each beam. The klystron operates in a solenoid. The principle challenges in the design included development of the beam optics using confined flow focusing, shaping of the magnetic field in the gun region to avoid beam spiraling, coupling input power equally to all eight beam lines from a single input, and obtaining the required frequency and Q in the output cavity. The mechanical design was particularly complex due to the large parts count, number of braze and weld joints, and close proximity of the beam lines that limited access. Addressing vacuum leaks and cold testing the complex structures was particularly troublesome. At the conclusion of the program, the klystron is experiencing several vacuum leaks that are under repair. Efforts will continue to seal and test the klystron.},
doi = {10.2172/918831},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2007},
month = {10}
}