Specification of harmonic corrections (wirefix) for the SLC ARCS

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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 ... continued below

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Pages: 58

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Bambade, P. & Hutton, A. February 1, 1989.

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Description

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.

Physical Description

Pages: 58

Notes

NTIS, PC A04/MF A01 - OSTI; 1.

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  • Other Information: Portions of this document are illegible in microfiche products

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  • Other: DE89007734
  • Report No.: SLAC-CN-370
  • Grant Number: AC03-76SF00515
  • DOI: 10.2172/6502755 | External Link
  • Office of Scientific & Technical Information Report Number: 6502755
  • Archival Resource Key: ark:/67531/metadc1205289

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • February 1, 1989

Added to The UNT Digital Library

  • July 5, 2018, 11:11 p.m.

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  • Oct. 26, 2018, 1:41 p.m.

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Bambade, P. & Hutton, A. Specification of harmonic corrections (wirefix) for the SLC ARCS, report, February 1, 1989; United States. (digital.library.unt.edu/ark:/67531/metadc1205289/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.