Overview of the X-band R&amp; D Program

Raubenheimer, T.O.

doi:10.2172/800060

Cited by 4 publications

(3 citation statements)

References 9 publications

(10 reference statements)

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“…The reach of this method is limited by the finite resolution of CESR's beam position monitors (BPMs) and therefore leaves residual vertical emittance, which is discernible * wfb59@cornell.edu in our high-resolution beam size measurements. Independent component analysis (ICA) [4], dispersion-freesteering (DFS) [5], and a low-emittance tuning (LET) algorithm [6] have also been tried at other accelerators, but these too suffer from reliance on accurate dispersion measurements for proper operation. Scanning magnet settings to tune directly on vertical emittance can yield further improvements.…”

Section: Introductionmentioning

confidence: 99%

Online storage ring optimization using dimension-reduction and genetic algorithms

Bergan

Bazarov

Duncan

et al. 2019

Phys. Rev. Accel. Beams

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Particle storage rings are a rich application domain for online optimization algorithms. The Cornell Electron Storage Ring (CESR) has hundreds of independently powered magnets, making it a high-dimensional test-problem for algorithmic tuning. We investigate algorithms that restrict the search space to a small number of linear combinations of parameters ("knobs") which contain most of the effect on our chosen objective (the vertical emittance), thus enabling efficient tuning. We report experimental tests at CESR that use dimension-reduction techniques to transform an 81dimensional space to an 8-dimensional one which may be efficiently minimized using one-dimensional parameter scans. We also report an experimental test of a multi-objective genetic algorithm using these knobs that results in emittance improvements comparable to state-of-the-art algorithms, but with increased control over orbit errors.

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Section: Introductionmentioning

confidence: 99%

Online storage ring optimization using dimension-reduction and genetic algorithms

Bergan

Bazarov

Duncan

et al. 2019

Phys. Rev. Accel. Beams

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“…[2], and detailed studies with intensive computer simulations are described in Refs. [3,4,5]. The purpose of this paper is to develop a simple model based on a FODO lattice approximation for the linac which allows an analytic calculation of the emittance dilution.…”

Section: Introductionmentioning

confidence: 99%

Quadrupole Misalignments and Steering in Long Linacs

Stupakov¹

2000

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We present a study of orbit jitter and emittance growth in a long linac caused by misalignment of quadrupoles. First, assuming a FODO lattice, we derive analytical formulae for the RMS deviation of the orbit and the emittance growth caused by random uncorrelated misalignments of all quadrupoles. We then consider an alignment algorithm based on minimization of BPM readings with a given BPM resolution and finite mover steps.

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“…The strength of the effect is reflected in the BPM offset luminosity tolerance of 25 µm (table 1); this should be compared to the expected installation tolerance of ~360 µm † . In the past, so-called dispersion free steering (DFS) [4] has been extensively studied as the primary beam-based alignment method. However, in the results reported in [1] and [2], the effects of the cavity tilts were not included, as well as other 'realistic' errors such as beam jitter.…”

Section: Introductionmentioning

confidence: 99%

Simulations of the static tuning for the tesla linear collider

Schulte

Walker²

Proceedings of the 2003 Bipolar/BiCMOS Circuits and Technology Meeting (IEEE Cat. No.03CH37440)

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At the heart of the TESLA linear collider are the two 10 km long superconducting linacs. A linac is constructed from 858 cryomodules each containing 12 nine-cell 1.3 GHz superconducting cavities. 355 quadrupoles provide the necessary beam focusing. The advantages of low-frequency superconducting RF in terms of wakefield behaviour are well known, and the TESLA alignment tolerances are relatively loose. However, the effects of cavity tilts and their impact of the linac beam-based alignment algorithms have until recently not been fully investigated. In addition, the strong sensitivity to correlated emittance growth due to the high beam-beam disruption parameter makes it desirable to control the linac emittance down to a few percent. In this report we discuss various static tuning algorithms and present new simulation results. Discussions of the relative merits and applicability of the methods is also discussed. AbstractAt the heart of the TESLA linear collider are the two 10 km long superconducting linacs. A linac is constructed from 858 cryomodules each containing 12 nine-cell 1.3 GHz superconducting cavities. 355 quadrupoles provide the necessary beam focusing. The advantages of low-frequency superconducting RF in terms of wakefield behaviour are well known, and the TESLA alignment tolerances are relatively loose. However, the effects of cavity tilts and their impact of the linac beam-based alignment algorithms have until recently not been fully investigated. In addition, the strong sensitivity to correlated emittance growth due to the high beam-beam disruption parameter makes it desirable to control the linac emittance down to a few percent. In this report we discuss various static tuning algorithms and present new simulation results. Discussions of the relative merits and applicability of the methods is also discussed.

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Overview of the X-band R& D Program

Cited by 4 publications

References 9 publications

Online storage ring optimization using dimension-reduction and genetic algorithms

Online storage ring optimization using dimension-reduction and genetic algorithms

Quadrupole Misalignments and Steering in Long Linacs

Simulations of the static tuning for the tesla linear collider

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