Performance of a high resolution cavity beam position monitor system

Walston, S.; Boogert, Stewart; Chung, Carl; Fitsos, P; Frisch, J.; Gronberg, J.; Hayano, H.; Honda, Y.; Kolomensky, Yury; Lyapin, A.; Malton, S.; May, J.; McCormick, Douglas; Meller, R.; Miller, D. J.; Orimoto, T.; Ross, M.; Slater, M.; Smith, S. R.; Smith, T.; Terunuma, N.; Thomson, M. A.; Urakawa, J.; Vogel, V.; Ward, D. R.; White, G.

doi:10.1016/j.nima.2007.04.162

Cited by 60 publications

(20 citation statements)

References 4 publications

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“…The accuracy of this measurement is limited to sub-millimeter by the finite spatial and charge resolution of the phosphor screen. The cavity BPM itself has been shown to support sub-micrometer accuracies [16]. Additional tests demonstrated that this type of BPM is sufficiently sensitive to detect electron bunches of only few pC charge.…”

Section: Beam Position Diagnosticmentioning

confidence: 99%

“…The deployed BPM [16,17] consists of a microwave resonator, which can be excited by an electron beam passing through. Its cavity primarily supports the TM 110 dipole mode and exhibits a slightly elliptical shape, which consequently leads to different resonance frequencies of 2.85 GHz and 2.86 GHz in the horizontal and vertical plane, respectively.…”

Section: Beam Position Diagnosticmentioning

confidence: 99%

See 1 more Smart Citation

Transport and Non-Invasive Position Detection of Electron Beams from Laser-Plasma Accelerators

Osterhoff¹,

Sokollik²,

Nakamura³

et al. 2010

AIP Conference Proceedings

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Abstract. The controlled imaging and transport of ultra-relativistic electrons from laser-plasma accelerators is of crucial importance to further use of these beams, e.g. in high peak-brightness light sources. We present our plans to realize beam transport with miniature permanent quadrupole magnets from the electron source through our THUNDER undulator. Simulation results demonstrate the importance of beam imaging by investigating the generated XUV-photon flux. In addition, first experimental findings of utilizing cavity-based monitors for non-invasive beam-position measurements in a noisy electromagnetic laser-plasma environment are discussed.

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Section: Beam Position Diagnosticmentioning

confidence: 99%

Section: Beam Position Diagnosticmentioning

confidence: 99%

Transport and Non-Invasive Position Detection of Electron Beams from Laser-Plasma Accelerators

Osterhoff¹,

Sokollik²,

Nakamura³

et al. 2010

AIP Conference Proceedings

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show abstract

“…The exponential factor accounts for the length of the charged particle bunch in time σ t assuming a Gaussian distribution in time [6]. Under the approximation that the mode output power is constant over one complete oscillation period, the peak output voltage V out is given by…”

Section: A Cavity Beam Position Monitor Principlementioning

confidence: 99%

“…For this purpose, the dipole and monopole modes should have the same resonant frequency and so two separate cavities are commonly used, one for each mode. The cavity in which the dipole mode is measured is referred to as the position cavity while the monopole mode cavity is referred to as the reference cavity [6].…”

Section: A Cavity Beam Position Monitor Principlementioning

confidence: 99%

Long bunch trains measured using a prototype cavity beam position monitor for the Compact Linear Collider

Cullinan

Boogert

Farabolini

et al. 2015

Phys. Rev. ST Accel. Beams

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The Compact Linear Collider (CLIC) requires beam position monitors (BPMs) with 50 nm spatial resolution for alignment of the beam line elements in the main linac and beam delivery system. Furthermore, the BPMs must be able to make multiple independent measurements within a single 156 ns long bunch train. A prototype cavity BPM for CLIC has been manufactured and tested on the probe beam line at the 3rd CLIC Test Facility (CTF3) at CERN. The transverse beam position is determined from the electromagnetic resonant modes excited by the beam in the two cavities of the pickup, the position cavity and the reference cavity. The mode that is measured in each cavity resonates at 15 GHz and has a loaded quality factor that is below 200. Analytical expressions for the amplitude, phase and total energy of signals from long trains of bunches have been derived and the main conclusions are discussed. The results of the beam tests are presented. The variable gain of the receiver electronics has been characterized using beam excited signals and the form of the signals for different beam pulse lengths with the 2=3 ns bunch spacing has been observed. The sensitivity of the reference cavity signal to charge and the horizontal position signal to beam offset have been measured and are compared with theoretical predictions based on laboratory measurements of the BPM pickup and the form of the resonant cavity modes as determined by numerical simulation. Finally, the BPM was calibrated so that the beam position jitter at the BPM location could be measured. It is expected that the beam jitter scales linearly with the beam size and so the results are compared to predicted values for the latter.

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“…When the beam goes through the cavity with an offset, the TM 110 mode, also called dipole mode, is excited proportionally to the product of offset and charge [10]. That dipole mode signal in the sensor cavity is selectively fed out to the waveguides through slots via magnetic coupling.…”

Section: A Instrumentmentioning

confidence: 99%

Trajectory measurements and correlations in the final focus beam line at the KEK Accelerator Test Facility

Renier

Bambade

Tauchi

et al. 2013

Phys. Rev. ST Accel. Beams

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The Accelerator Test Facility 2 (ATF2) commissioning group aims to demonstrate the feasibility of the beam delivery system of the next linear colliders (ILC and CLIC) as well as to define and to test the tuning methods. As the design vertical beam sizes of the linear colliders are about few nanometers, the stability of the trajectory as well as the control of the aberrations are very critical. ATF2 commissioning started in December 2008, and thanks to submicron resolution beam position monitors (BPMs), it has been possible to measure the beam position fluctuation along the final focus of ATF2 during the 2009 runs. The optics was not the nominal one yet, with a lower focusing to make the tuning easier. In this paper, a method to measure the noise of each BPM every pulse, in a model-independent way, will be presented. A method to reconstruct the trajectory's fluctuations is developed which uses the previously determined BPM resolution. As this reconstruction provides a measurement of the beam energy fluctuations, it was also possible to measure the horizontal and vertical dispersion function at each BPMs parasitically. The spatial and angular dispersions can be fitted from these measurements with uncertainties comparable with usual measurements.

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Performance of a high resolution cavity beam position monitor system

Cited by 60 publications

References 4 publications

Transport and Non-Invasive Position Detection of Electron Beams from Laser-Plasma Accelerators

Transport and Non-Invasive Position Detection of Electron Beams from Laser-Plasma Accelerators

Long bunch trains measured using a prototype cavity beam position monitor for the Compact Linear Collider

Trajectory measurements and correlations in the final focus beam line at the KEK Accelerator Test Facility

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