Fast beam-based alignment using ac excitations

Martí, Zeus; Benedetti, Gabriele; Iriso, Ubaldo; Franchi, A.

doi:10.1103/physrevaccelbeams.23.012802

Cited by 7 publications

(6 citation statements)

References 5 publications

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“…However, standard methods of performing the measurements can take many hours making this impractical. Therefore, we have developed a fast BBA method based on previous work at the ALBA synchrotron [1].…”

Section: Figurementioning

confidence: 99%

“…According to [1] we are interested in the value of y I (s) when y H i (s) = y L i (s). For each line we can compute the corresponding fit coordinate as:…”

Section: From Line Fit To Bbamentioning

confidence: 99%

“…BBA is a common system used to align the electron beam to the magnetic centres of the quadrupoles which would generally be done in reference to an ideal orbit; but due to variability between runs and because of environmental changes, this is not practical. Thus, the perfect orbit is defined as one where the electron beam goes through the magnetic centres of all quadrupoles, which is assumed to be more stable over time [1].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Development of fast BBA for Diamond Light Source

Appleby,

Abbott,

Fielder

et al. 2024

J. Phys.: Conf. Ser.

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Beam-based alignment (BBA) is a standard tool at accelerators for aligning particle beams to the centre of quadrupole magnets. Traditional BBA measurements have been slow, potentially taking many hours for a whole machine. We have developed a tool, based on results previously reported at the ALBA synchrotron, that uses fast excitation of magnets to speed up measurements. We show the results of different measurement and analysis techniques in comparison to the currently used slow method.

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Section: Figurementioning

confidence: 99%

“…According to [1] we are interested in the value of y I (s) when y H i (s) = y L i (s). For each line we can compute the corresponding fit coordinate as:…”

Section: From Line Fit To Bbamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of fast BBA for Diamond Light Source

Appleby,

Abbott,

Fielder

et al. 2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…It may give inaccurate results if the beam trajectory has a pronounced angle at the quadrupole [19], but this does not affect the judgment of the beam passing through the center of quadrupole.…”

Section: K Modulationmentioning

confidence: 99%

Numerical Study on Beam-based Alignment of SXFEL Undulator Lattice

Li¹,

Huang²,

Zhang³

et al. 2021

Preprint

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The undulator line of the Shanghai soft X-ray Free-electron Laser facility (SXFEL) has very tight tolerances on the straightness of the electron beam trajectory.However, the beam trajectory cannot meet the lasing requirements due to the influence of beam position, launch angle and quadrupole offsets. Traditional mechanical alignment can only control the rms of offsets to about 100 µm, which is far from reaching the requirement. Further orbit correction can be achieved by beam-based alignment (BBA) method based on electron energy variations. K modulation is used to determine whether the beam passes through the quadrupole magnetic center, and the Dispersion-Free Steering (DFS) method is used to calculate the offsets of quadrupole and BPM. In this paper, a detailed result of simulation is presented which demonstrates that the beam trajectory with rms and standard deviation (σ) less than 10 µm can be obtained.

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“…A recent progress on the topic is the use of AC excitation of corrector magnets for beam based alignment [8].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous beam based alignment measurement for multiple magnets

Huang¹

2022

Preprint

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We propose a method to simultaneously determine the magnetic centers of multiple quadrupoles in a transport line or a storage ring. The method finds the magnet centers by correcting the orbit shift due to a change of the quadrupole gradient strengths with orbit correctors. The quadrupoles are selected with orbit corrector magnets and beam position monitors in between to ensure that orbit correction at the quadrupole locations can be achieved. The correction of the induced orbit shift is done by steering the orbit toward the quadrupole centers with correctors, using its response matrix with respect to the correctors. The response matrix can be measured or calculated. Simulations with a section of the Linac Coherent Light Source (LCLS) II and the SPEAR3 storage ring are done to demonstrate the feasibility and performance of the method. It is also experimentally tested on SPEAR3. The method can be extended for beam based alignment measurement of nonlinear magnets.

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Fast beam-based alignment using ac excitations

Cited by 7 publications

References 5 publications

Development of fast BBA for Diamond Light Source

Development of fast BBA for Diamond Light Source

Numerical Study on Beam-based Alignment of SXFEL Undulator Lattice

Simultaneous beam based alignment measurement for multiple magnets

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