NAPAC2016 - Table of Session: FRA2 (Oral Presentations (MC6))

Paper	Title	Page
FRA2IO01	Development and Application of Online Optimization Algorithms	1287
	X. Huang SLAC, Menlo Park, California, USA
	Funding: DOE Automated tuning is an online optimization process. It can be faster and more efficient than manual tuning and can lead to better performance. Automated tuning is an online optimization process. It is more efficient than manual tuning and can lead to better performance. It may also substitute or improve upon model based methods. Noise tolerance is a fundamental challenge to online optimization algorithms. We discuss our experience in developing a high efficiency, noise-tolerant optimization algorithm, the RCDS method, and the successful application of the algorithm to various real-life accelerator problems. Experience with a few other online optimization algorithms are also discussed. A performance stabilizer and an interactive optimization GUI are presented.
	Slides FRA2IO01 [3.601 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-FRA2IO01
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FRA2IO02	High Precision RF Control for the LCLS-II	1292
	G. Huang, K. Campbell, L.R. Doolittle, J.A. Jones, C. Serrano, V.K. Vytla LBNL, Berkeley, California, USA S. Babel, M. Boyes, G.W. Brown, D. Cha, B. Hong, A. Ratti, C.H. Rivetta SLAC, Menlo Park, California, USA R. Bachimanchi, C. Hovater, D.J. Seidman JLab, Newport News, Virginia, USA B.E. Chase, E. Cullerton, Q. Du, J. Einstein, D.W. Klepec Fermilab, Batavia, Illinois, USA
	Funding: Work supported by the LCLS-II Project and the U.S. Department of Energy, Contract DE-AC02-76SF00515 The LCLS-II is a CW superconducting linac under construction to drive an X-ray FEL. The energy and timing stability requirements of the FEL drive the need for very high precision RF control. This paper summarize the design considerations and early demonstration of the performance of the components and system we developed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-FRA2IO02
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FRA2CO03	Study of the Electrical Center of a Resonant Cavity Beam Position Monitor (RF-BPM) and Its Integration With the Main Beam Quadrupole for Alignment Purposes	1297
SUPO54	use link to see paper's listing under its alternate paper code
	S. Zorzetti, M. Wendt CERN, Geneva, Switzerland L. Fanucci Università di Pisa, Pisa, Italy
	To achieve the luminosity goals in a next generation linear collider, acceleration and preservation of ultra-low emittance particle beams is mission critical and requires a precise alignment between the main accelerator components. PACMAN is an innovative doctoral training program, hosted by CERN, with the goal of developing high accuracy metrology and alignment methods and tools to integrate those components in a standalone, automatic test bench. The method will be validated on CLIC components, a proposed Compact Linear Collider currently studied at CERN. The alignment between the electrical center of the Beam Position Monitor (BPM) and the magnetic center of the associated Main Beam Quadrupole (MBQ) is of particular importance to minimize the emittance blow-up, and therefore in the focus of the PACMAN project. The two components have been independently characterized on separated test benches by stretched and vibrating wire techniques. Preliminary conclusions are presented in this paper, with emphasis on the characterization of the electrical center of the BPM. The PACMAN project is funded by the European Union' s Seventh Framework Programme for research, technological development and demonstration under grant agreement no. 606839
	Slides FRA2CO03 [7.920 MB]
	Poster FRA2CO03 [1.570 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-FRA2CO03
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FRA2CO04	Status of the SRF Cavities Resonance Control R&D Work at FNAL
	Y.M. Pischalnikov, J.P. Holzbauer, W. Schappert Fermilab, Batavia, Illinois, USA
	There are several new machines under construction or development at this moment. Some machines, (LCLS II and PIP II ) will operate with the relatively low beam currents and high cavity quality factors. SRF cavities for these projects will be operated with small RF bandwidths, meaning that they will be highly sensitive to microphonics and Lorentz force detuning. Other future projects such as ESS will be operate with SRF cavities tuned for larger RF bandwidth but will still have significant Lorentz Force Detuning. Work is ongoing at FNAL to develop active resonance stabilization techniques using fast piezoelectric tuners in support of PIP-II and LCLS II. These techniques as well as testing and development results using a prototype, dressed low-beta single-spoke cavity and 9-cell elliptical cavities will be presented along with an outlook for future efforts.
	Slides FRA2CO04 [3.544 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Development and Application of Online Optimization Algorithms

1287

X. Huang
SLAC, Menlo Park, California, USA

Funding: DOE
Automated tuning is an online optimization process. It can be faster and more efficient than manual tuning and can lead to better performance. Automated tuning is an online optimization process. It is more efficient than manual tuning and can lead to better performance. It may also substitute or improve upon model based methods. Noise tolerance is a fundamental challenge to online optimization algorithms. We discuss our experience in developing a high efficiency, noise-tolerant optimization algorithm, the RCDS method, and the successful application of the algorithm to various real-life accelerator problems. Experience with a few other online optimization algorithms are also discussed. A performance stabilizer and an interactive optimization GUI are presented.

Slides FRA2IO01 [3.601 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-FRA2IO01

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRA2IO02

High Precision RF Control for the LCLS-II

1292

G. Huang, K. Campbell, L.R. Doolittle, J.A. Jones, C. Serrano, V.K. Vytla
LBNL, Berkeley, California, USA
S. Babel, M. Boyes, G.W. Brown, D. Cha, B. Hong, A. Ratti, C.H. Rivetta
SLAC, Menlo Park, California, USA
R. Bachimanchi, C. Hovater, D.J. Seidman
JLab, Newport News, Virginia, USA
B.E. Chase, E. Cullerton, Q. Du, J. Einstein, D.W. Klepec
Fermilab, Batavia, Illinois, USA

Funding: Work supported by the LCLS-II Project and the U.S. Department of Energy, Contract DE-AC02-76SF00515
The LCLS-II is a CW superconducting linac under construction to drive an X-ray FEL. The energy and timing stability requirements of the FEL drive the need for very high precision RF control. This paper summarize the design considerations and early demonstration of the performance of the components and system we developed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-FRA2IO02

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRA2CO03

Study of the Electrical Center of a Resonant Cavity Beam Position Monitor (RF-BPM) and Its Integration With the Main Beam Quadrupole for Alignment Purposes

1297

SUPO54

use link to see paper's listing under its alternate paper code

S. Zorzetti, M. Wendt
CERN, Geneva, Switzerland
L. Fanucci
Università di Pisa, Pisa, Italy

To achieve the luminosity goals in a next generation linear collider, acceleration and preservation of ultra-low emittance particle beams is mission critical and requires a precise alignment between the main accelerator components. PACMAN is an innovative doctoral training program, hosted by CERN, with the goal of developing high accuracy metrology and alignment methods and tools to integrate those components in a standalone, automatic test bench. The method will be validated on CLIC components, a proposed Compact Linear Collider currently studied at CERN. The alignment between the electrical center of the Beam Position Monitor (BPM) and the magnetic center of the associated Main Beam Quadrupole (MBQ) is of particular importance to minimize the emittance blow-up, and therefore in the focus of the PACMAN project. The two components have been independently characterized on separated test benches by stretched and vibrating wire techniques. Preliminary conclusions are presented in this paper, with emphasis on the characterization of the electrical center of the BPM.
The PACMAN project is funded by the European Union' s Seventh Framework Programme for research, technological development and demonstration under grant agreement no. 606839

Slides FRA2CO03 [7.920 MB]

Poster FRA2CO03 [1.570 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-FRA2CO03

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRA2CO04

Status of the SRF Cavities Resonance Control R&D Work at FNAL

Y.M. Pischalnikov, J.P. Holzbauer, W. Schappert
Fermilab, Batavia, Illinois, USA

There are several new machines under construction or development at this moment. Some machines, (LCLS II and PIP II ) will operate with the relatively low beam currents and high cavity quality factors. SRF cavities for these projects will be operated with small RF bandwidths, meaning that they will be highly sensitive to microphonics and Lorentz force detuning. Other future projects such as ESS will be operate with SRF cavities tuned for larger RF bandwidth but will still have significant Lorentz Force Detuning. Work is ongoing at FNAL to develop active resonance stabilization techniques using fast piezoelectric tuners in support of PIP-II and LCLS II. These techniques as well as testing and development results using a prototype, dressed low-beta single-spoke cavity and 9-cell elliptical cavities will be presented along with an outlook for future efforts.

Slides FRA2CO04 [3.544 MB]

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)