• Open Access

Straightforward and accurate technique for post-coupler stabilization in drift tube linac structures

Mohammad Reza Khalvati and Suitbert Ramberger
Phys. Rev. Accel. Beams 19, 042001 – Published 12 April 2016

Abstract

The axial electric field of Alvarez drift tube linacs (DTLs) is known to be susceptible to variations due to static and dynamic effects like manufacturing tolerances and beam loading. Post-couplers are used to stabilize the accelerating fields of DTLs against tuning errors. Tilt sensitivity and its slope have been introduced as measures for the stability right from the invention of post-couplers but since then the actual stabilization has mostly been done by tedious iteration. In the present article, the local tilt-sensitivity slope TSn is established as the principal measure for stabilization instead of tilt sensitivity or some visual slope, and its significance is developed on the basis of an equivalent-circuit diagram of the DTL. Experimental and 3D simulation results are used to analyze its behavior and to define a technique for stabilization that allows finding the best post-coupler settings with just four tilt-sensitivity measurements. CERN’s Linac4 DTL Tank 2 and Tank 3 have been stabilized successfully using this technique. The final tilt-sensitivity error has been reduced from ±100%/MHz down to ±3%/MHz for Tank 2 and down to ±1%/MHz for Tank 3. Finally, an accurate procedure for tuning the structure using slug tuners is discussed.

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  • Received 18 December 2015

DOI:https://doi.org/10.1103/PhysRevAccelBeams.19.042001

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

  1. Physical Systems
Accelerators & Beams

Authors & Affiliations

Mohammad Reza Khalvati1,2,* and Suitbert Ramberger2,†

  • 1School of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, Iran
  • 2CERN, 1211 Geneva 23, Switzerland

  • *Khalvati@ipm.ir
  • Suitbert.Ramberger@cern.ch

Article Text

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Issue

Vol. 19, Iss. 4 — April 2016

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