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Title: LAMPF 805-MHz accelerator structure tuning and its relation to fabrication and installation

Abstract

In the course of construction of the 805-MHz linac, it was necessary to set 10,000 resonant cavities to precise frequencies and to check, and in some cases, to adjust the field distribution along the beam axis of the 104 rf tanks composing the linac. Since this was the first proton linac of the side-coupled type ever built, it was necessary to develop new techniques and instrumentation for structure tuning. An outline of the fabrication and installation process is given, showing how the tuning operations were interwoven with the fabrication steps and indicating the relation of tuning to other installation and check-out activities. The steps of the tuning procedure are then examined in detail. Tools for tuning by dinging, nose-stretching, and septum bending are described. Techniques for frequency measurements and for beadpull measurements of field distribution are discussed. The section on field distribution measurement includes results of research on measurement procedure and theory and observations confirming the low-power stability of field distributions for a three-year period. Selected results from the theory of chains of coupled resonators are given. Coupled resonator model parameters and various measured parameters for the 805-MHz linac are tabulated.

Authors:
Publication Date:
Research Org.:
Los Alamos Scientific Lab., NM (USA)
OSTI Identifier:
6055162
Report Number(s):
LA-7915-MS
TRN: 79-019461
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; LAMPF LINAC; TUNING; CAVITY RESONATORS; FREQUENCY MEASUREMENT; INSTALLATION; MEASURING METHODS; ACCELERATORS; ELECTRONIC EQUIPMENT; LINEAR ACCELERATORS; MESON FACTORIES; RESONATORS; 430303* - Particle Accelerators- Experimental Facilities & Equipment

Citation Formats

Swain, G R. LAMPF 805-MHz accelerator structure tuning and its relation to fabrication and installation. United States: N. p., 1979. Web. doi:10.2172/6055162.
Swain, G R. LAMPF 805-MHz accelerator structure tuning and its relation to fabrication and installation. United States. https://doi.org/10.2172/6055162
Swain, G R. Sun . "LAMPF 805-MHz accelerator structure tuning and its relation to fabrication and installation". United States. https://doi.org/10.2172/6055162. https://www.osti.gov/servlets/purl/6055162.
@article{osti_6055162,
title = {LAMPF 805-MHz accelerator structure tuning and its relation to fabrication and installation},
author = {Swain, G R},
abstractNote = {In the course of construction of the 805-MHz linac, it was necessary to set 10,000 resonant cavities to precise frequencies and to check, and in some cases, to adjust the field distribution along the beam axis of the 104 rf tanks composing the linac. Since this was the first proton linac of the side-coupled type ever built, it was necessary to develop new techniques and instrumentation for structure tuning. An outline of the fabrication and installation process is given, showing how the tuning operations were interwoven with the fabrication steps and indicating the relation of tuning to other installation and check-out activities. The steps of the tuning procedure are then examined in detail. Tools for tuning by dinging, nose-stretching, and septum bending are described. Techniques for frequency measurements and for beadpull measurements of field distribution are discussed. The section on field distribution measurement includes results of research on measurement procedure and theory and observations confirming the low-power stability of field distributions for a three-year period. Selected results from the theory of chains of coupled resonators are given. Coupled resonator model parameters and various measured parameters for the 805-MHz linac are tabulated.},
doi = {10.2172/6055162},
url = {https://www.osti.gov/biblio/6055162}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {7}
}