Monitoring of particle beams at high frequencies

Cuperus, J.

doi:10.1016/0029-554x(77)90414-1

Cited by 30 publications

(17 citation statements)

References 6 publications

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“…In the case of SNS, the BPM pickups are shorted striplines. For the beam near the center of the beam pipe, the amplitude of the BPM's sum signal is [3] …”

Section: Methods Description and Its Limitationsmentioning

confidence: 99%

Noninterceptive method to measure longitudinal Twiss parameters of a beam in a hadron linear accelerator using beam position monitors

Shishlo

Aleksandrov

2013

Phys. Rev. ST Accel. Beams

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A new method of measuring of the rms longitudinal Twiss parameters of a beam in linear accelerators is presented. It is based on using sum signals from beam position monitors sensitive to the longitudinal charge distribution in the bunch. The applicability of the method is demonstrated on the superconducting section of the Oak Ridge Spallation Neutron Source linear accelerator. The results are compared to a direct measurement of the bunch longitudinal profiles using an interceptive bunch shape monitor in the linac warm section of the same accelerator. Limitations of the method are discussed. The method is fast and simple, and can be used to obtain the initial parameters for the longitudinal matching in linear accelerators where interceptive diagnostics are not desirable.

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“…In the case of SNS, the BPM pickups are shorted striplines. For the beam near the center of the beam pipe, the amplitude of the BPM's sum signal is [3] …”

Section: Methods Description and Its Limitationsmentioning

confidence: 99%

Noninterceptive method to measure longitudinal Twiss parameters of a beam in a hadron linear accelerator using beam position monitors

Shishlo

Aleksandrov

2013

Phys. Rev. ST Accel. Beams

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“…The beam bunch monitor described in this thesis compares two components of the Fourier spectrum of the beam; the fundamental component which corresponds to the distances between bunches, and a higher harmonic which depends on the temporal shape of the beam [7]. The theoretical development leading to the magnitudes of these components will now be presented.…”

Section: Fourier Spectral Componentsmentioning

confidence: 99%

A linear accelerator bunch length monitor

Jessie

Norum

1996

IEEE Trans. Nucl. Sci.

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The Saskatchewan Accelerator Laboratory is a 300 MeV electron accelerator (Linac) and storage ring. Electrons are injected into the Linac in packets called bunches for acceleration by an electromagnetic field. The length of these bunches have a direct impact on the energy spread of the beam at the exit of the Linac. A large bunch length increases the background radiation in and around the Energy Compression System located at the end of the Linac and is an inefficient way of operating the accelerator.Bunch length is dependent on the relative phase of the microwave power used by the Linac components. A monitor has been developed that will measure the bunch length early in injection so that the relative phase of the microwave power can be adjusted for optimal bunching.The power available at two sufficiently separate harmonics in the frequency domain will give an indication of the bunch length in time. Simulations indicate the first and fourth harmonics fulfill this criteria.The bunch length monitor consists of a circular disk of copper 1 em in diameter located 3 mm from the inside surface of the beam pipe wall. It also includes a power splitter and two bandpass filters, one at the Linac RF frequency of 2.856 GHz and the other at the fourth harmonic, 11.424 GHz.The bunch length monitor was tested in a number of trials. By varying the prebuncher phase, two minima in bunch length were observed; one minima due to the injector and the other to the first accelerating section. A reduction of 12 % in energy spread was observed and it is anticipated that with more thorough optimization, a reduction of up to 20 % could be realized.11

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“…Figure 2 (a) shows the electrode signal V p (t) without frequency filtering and Fig. 2 (b) using a bandpass filter at [1,2] GHz. If the electrodes are not rectangular, the results are similar but a bit more complicated.…”

Section: Y (2)mentioning

confidence: 99%

Analysis of the beam position measurement with button-type pickups in APS

Chung¹

1991

AIP Conference Proceedings

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The response of electrostatic button-type pickups for the measurement of the transverse position of charged particle beams was investigated and analytic formulae were obtained for the signal as a function of time t. The study was done for beam pipes of circular and elliptic cross sections, for rectangular and non-rectangular electrodes, and for several cases of longitudinal beam profiles. In particular, the error in the measurement of the beam position using circular electrodes as compared to rectangular ones was found to be less than 100 urn per 1 cm of beam excursion from the center of the beam pipe for the case of APS. INTRODUCTIONFor capacitive pickup devices, the position of the charged beam is measured through the difference between the electric potentials which develop on the electrodes. For slow, nonrelativistic beams, the image charge induced by the bunch of charged particles has considerably larger longitudinal dimension than the bunch itself. However, for highly relativistic beams, the image charge has the same longitudinal distribution as the beam, due to the Lorentz contraction of the longitudinal component of the electric field.In this article, we will derive the response of the electrode as a function of time and the transverse position of the beam, assuming that both the angular and the longitudinal sizes of the electrodes are finite. The analytical model assumes a simple elliptic geometry for the beam chamber. The results are compared with those obtained numerically for the actual APS beam chamber, and they will be shown to agree quite well. This justifies the use of the analytical model rather than the timeconsuming numerical methods to find the optimal position and size of the electrodes and to analyze how the shape of the electrodes affect the beam position measurement. MONITOR RESPONSEIn order to get the signal from each electrode, we must first obtain the electric field inside the beam chamber. Consider an infinitely narrow beam moving along the longitudinal direction with the constant velocity OHTRIBUT1ON OF TH,S DOCUMENT J DISCLAIMER

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Monitoring of particle beams at high frequencies

Cited by 30 publications

References 6 publications

Noninterceptive method to measure longitudinal Twiss parameters of a beam in a hadron linear accelerator using beam position monitors

Noninterceptive method to measure longitudinal Twiss parameters of a beam in a hadron linear accelerator using beam position monitors

A linear accelerator bunch length monitor

Analysis of the beam position measurement with button-type pickups in APS

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