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Title: Specification of harmonic corrections (wirefix) for the SLC ARCS

Abstract

In the original SLC commissioning plans, it was thought that accumulated optical mismatch, generated by focusing errors in the whole machine, would be corrected at the very end, in the Final Focus. Dedicated correctors for optical matching and a special adjustment strategy were planned for this purpose, with a large tuning range of up to about a factor four in any dimension of the beam phase-space. With the present collimation and shielding arrangements, it is necessary to control the beam upstream of the Final Focus in order to inject a nearly matched phase-space there. We have developed and installed a new system of harmonic focusing corrections at the end of the SLC Arcs, to provide such control. The scheme consists of introducing small regular and skew focusing deviations at specific harmonics of the betatron frequency which the phase-space is specially sensitive to. The harmonics in question are the zeroeth harmonic and the second harmonic of the betatron frequency. The focusing deviations are introduced in the Arc lattice by perturbing the strengths of the combined function magnets with a set of appropriately rewired trim windings at their backleg. The corrections provide an efficient way for adjusting both for errors in themore » Arc lattice and for mismatch at the injection to the Arc, generated by the upstream systems. In this note, we describe the specification of this correction procedure as well as the present installation. Initial operational experience with this new method for adjusting beam-lines is presented elsewhere. 20 refs., 18 figs.« less

Authors:
;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
OSTI Identifier:
6502755
Report Number(s):
SLAC-CN-370
ON: DE89007734
DOE Contract Number:  
AC03-76SF00515
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BEAM FOCUSING MAGNETS; CORRECTIONS; BEAM EMITTANCE; HARMONIC OSCILLATORS; PERTURBATION THEORY; PHASE SPACE; SIMULATION; SPECIFICATIONS; STANFORD LINEAR COLLIDER; ACCELERATOR FACILITIES; ACCELERATORS; ELECTRICAL EQUIPMENT; ELECTROMAGNETS; ELECTRONIC EQUIPMENT; EQUIPMENT; LINEAR ACCELERATORS; MAGNETS; MATHEMATICAL SPACE; OSCILLATORS; SPACE; 430300* - Particle Accelerators- Auxiliaries & Components

Citation Formats

Bambade, P, and Hutton, A. Specification of harmonic corrections (wirefix) for the SLC ARCS. United States: N. p., 1989. Web. doi:10.2172/6502755.
Bambade, P, & Hutton, A. Specification of harmonic corrections (wirefix) for the SLC ARCS. United States. https://doi.org/10.2172/6502755
Bambade, P, and Hutton, A. 1989. "Specification of harmonic corrections (wirefix) for the SLC ARCS". United States. https://doi.org/10.2172/6502755. https://www.osti.gov/servlets/purl/6502755.
@article{osti_6502755,
title = {Specification of harmonic corrections (wirefix) for the SLC ARCS},
author = {Bambade, P and Hutton, A},
abstractNote = {In the original SLC commissioning plans, it was thought that accumulated optical mismatch, generated by focusing errors in the whole machine, would be corrected at the very end, in the Final Focus. Dedicated correctors for optical matching and a special adjustment strategy were planned for this purpose, with a large tuning range of up to about a factor four in any dimension of the beam phase-space. With the present collimation and shielding arrangements, it is necessary to control the beam upstream of the Final Focus in order to inject a nearly matched phase-space there. We have developed and installed a new system of harmonic focusing corrections at the end of the SLC Arcs, to provide such control. The scheme consists of introducing small regular and skew focusing deviations at specific harmonics of the betatron frequency which the phase-space is specially sensitive to. The harmonics in question are the zeroeth harmonic and the second harmonic of the betatron frequency. The focusing deviations are introduced in the Arc lattice by perturbing the strengths of the combined function magnets with a set of appropriately rewired trim windings at their backleg. The corrections provide an efficient way for adjusting both for errors in the Arc lattice and for mismatch at the injection to the Arc, generated by the upstream systems. In this note, we describe the specification of this correction procedure as well as the present installation. Initial operational experience with this new method for adjusting beam-lines is presented elsewhere. 20 refs., 18 figs.},
doi = {10.2172/6502755},
url = {https://www.osti.gov/biblio/6502755}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 1989},
month = {Wed Feb 01 00:00:00 EST 1989}
}