FEEDBACK: Theory and Accelerator Applications

Himel, T.

doi:10.1146/annurev.nucl.47.1.157

Cited by 10 publications

(8 citation statements)

References 19 publications

(13 reference statements)

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“…Minimizing and stabilizing such current-dependent dilutions proved essential for achieving routine, high-luminosity operation. By the end of the SLC program, the emittance growth from the (uncoupled) damping rings to the end of the linac was routinely maintained to less than (15)(16)(17)(18)(19)(20)% at bunch charges of 4×10 10 both horizontally and vertically compared with nearly a factor of 3 increase seen in Fig. 2.…”

Section: Shown Inmentioning

confidence: 99%

“…By this time many emittance enlargement effects had been reduced significantly such as optical mismatches in the ring-tolinac transport line [2][3][4], dilutions arising from quadrupole and accelerator misalignments [5][6][7][8][9], and coupling generated in the nonplanar collider arcs [10]. In addition, both long and short term variations in the beam properties at injection [11] and in the main linac were controlled using orbit feedback [12][13][14][15][16][17][18][19][20] and BNS damping. At injection, fluctuations and drift of the transverse beam position and angle were regulated using launch feedback loops [13,14] while the injection phase was held nominally constant by maintaining the phase of the injected beam using analog feedback between the rf systems of the linac and damping ring [21].…”

Section: Introductionmentioning

confidence: 99%

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Emittance preservation in linear accelerators

Minty¹

2001

AIP Conference Proceedings

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Abstract.In linear colliders preservation of the phase space density of charged particles during acceleration to high energies is essential. In practice, the electromagnetic fields which govern the beam transport may not be sufficiently well understood. This may arise, for example, from magnet and structure alignment and/or manufacturing errors, timevarying electromagnetic fields due to component vibration or imperfect regulation, or at high beam currents, from beam-induced fields. These inadequacies may be overcome using measurements of the beam response. In this report we review such methods for preserving single-bunch beam emittances with experimental results from the Stanford Linear Collider.

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Section: Shown Inmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Emittance preservation in linear accelerators

Minty¹

2001

AIP Conference Proceedings

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“…One can intuit that high luminosity requires a large constellation of systems to be functioning as one. Integrated luminosity requires exceptional attention to maintenance, and choreography b y a team of expert operators, aided by beamline instruments, software and feedback [54].…”

Section: Colliding-beamsmentioning

confidence: 99%

Introduction to Microwave Linear [Accelerators]

Whittum¹

1999

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The elements of microwave linear accelerators are introduced starting with the principles of acceleration and accelerating structures. Considerations for microwave structure modelling and design are developed from an elementary point of view. Basic elements of microwave electronics are described for application to the accelerator circuit and instrumentation. Concepts of beam physics are explored together with examples of common beamline instruments. Charged particle optics and lattice diagnostics are introduced. Considerations for xed-target and colliding-beam experimentation are summarized.

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“…The technique of beam orbit feedback [3] uses at least one beam position monitor (BPM) to track the position of the beam and one corrector magnet to restore it to its nominal orbit. Such systems are limited by the frequency at which the BPM data is generated.…”

Section: Introductionmentioning

confidence: 99%

Compensation of orbit distortion due to quadrupole motion using feed-forward control at KEK ATF

Bett

Charrondiere

Patecki

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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A B S T R A C TThe high luminosity requirement for a future linear collider sets a demanding limit on the beam quality at the Interaction Point (IP). One potential source of luminosity loss is the motion of the ground itself. The resulting misalignments of the quadrupole magnets cause distortions to the beam orbit and hence an increase in the beam emittance. This paper describes a technique for compensating this orbit distortion by using seismometers to monitor the misalignment of the quadrupole magnets in real-time.The first demonstration of the technique was achieved at the Accelerator Test Facility (ATF) at KEK in Japan. The feed-forward system consisted of a seismometer-based quadrupole motion monitoring system, an FPGAbased feed-forward processor and a stripline kicker plus associated electronics. Through the application of a kick calculated from the position of a single quadruple, the system was able to remove about 80% of the component of the beam jitter that was correlated to the motion of the quadrupole. As a significant fraction of the orbit jitter in the ATF final focus is due to sources other than quadrupole misalignment, this amounted to an approximately 15% reduction in the absolute beam jitter.

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FEEDBACK: Theory and Accelerator Applications

Cited by 10 publications

References 19 publications

Emittance preservation in linear accelerators

Emittance preservation in linear accelerators

Introduction to Microwave Linear [Accelerators]

Compensation of orbit distortion due to quadrupole motion using feed-forward control at KEK ATF

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