Dynamic devices. A primer on pickups and kickers

Goldberg, D.A.; Lambertson, G.

doi:10.1063/1.41979

Cited by 39 publications

(24 citation statements)

References 8 publications

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“…The above result agrees with Goldberg [11]. The value of R is the characteristic impedance of the coaxial cable and C can be obtained from the equation for parallel plate capacitors.…”

Section: Button Impedancesupporting

confidence: 78%

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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“…The above result agrees with Goldberg [11]. The value of R is the characteristic impedance of the coaxial cable and C can be obtained from the equation for parallel plate capacitors.…”

Section: Button Impedancesupporting

confidence: 78%

A linear accelerator bunch length monitor

Jessie

Norum

1996

IEEE Trans. Nucl. Sci.

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“…Interacting with the electromagnetic field associated with the electron beam, the electrode pickups can be used to measure the electron beam current and position. Following the reports presented by G. R. Lambertson and D. A. Goldberg on electromagnetic detectors [14,15], we revisit the signals from two types of BPM pickups, button and stripline pickups which are used in the Duke storage ring.…”

Section: A Revisit Of Bpm Pickup Signalsmentioning

confidence: 99%

“…Assuming the electrons and the excited signals both move with the speed of light c, there are two pulses moving through the output line separated by ∆t = 2l/c, where l is the effective length of the stripline. Also assuming the electrode characteristic impedance and the output line impedance are Z L , the signal can be written as [14,15],…”

Section: A Revisit Of Bpm Pickup Signalsmentioning

confidence: 99%

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Conditioning of BPM pickup signals for operations of the Duke storage ring with a wide range of single-bunch current

Huang

et al. 2014

Chinese Phys. C

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The Duke storage ring is a dedicated driver for the storage ring based oscillator free-electron lasers (FELs), and the High Intensity Gamma-ray Source (HIGS). It is operated with a beam current ranging from about 1 mA to 100 mA per bunch for various operations and accelerator physics studies. High performance operations of the FEL and γ-ray source require a stable electron beam orbit, which has been realized by the global orbit feedback system. As a critical part of the orbit feedback system, the electron beam position monitors (BPMs) are required to be able to precisely measure the electron beam orbit in a wide range of the single-bunch current. However, the high peak voltage of the BPM pickups associated with high single-bunch current degrades the performance of the BPM electronics, and can potentially damage the BPM electronics. A signal conditioning method using low pass filters is developed to reduce the peak voltage to protect the BPM electronics, and to make the BPMs capable of working with a wide range of single-bunch current. Simulations and electron beam based tests are performed. The results show that the Duke storage ring BPM system is capable of providing precise orbit measurements to ensure highly stable FEL and HIGS operations.

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“…Compared to the previous devices, the new system has the following main features: possibility to implement injection with much shorter pulse ( % 12 ns instead of % 150 ns); better uniformity of the deflecting field as a function of the transverse coordinates; and lower beam impedance and possibility of higher repetition rate (50 Hz). The main parameters of the new kickers are given in Table II. The kicker is basically a two stripline structure [9], where both the striplines and the surrounding chamber have been tapered. Each transverse section has constant 50 impedance to match the output impedance of the high voltage pulse generator.…”

Section: Introductionmentioning

confidence: 99%

Design, test, and operation of new tapered stripline injection kickers for thee+e−colliderDAΦNE

Alesini

Guiducci

Marcellini

et al. 2010

Phys. Rev. ST Accel. Beams

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For the injection upgrade of the È factory DAÈNE, new fast stripline kickers have been designed. They can operate with very short pulse generators to perturb only the injected bunch and the two stored adjacent ones. The design is based on tapering the striplines to simultaneously obtain low beam coupling and transfer impedances, excellent uniformity of the deflecting field, and better matching between the strip and the pulse generators. It has been done using 2D and 3D electromagnetic codes (SUPERFISH and HFSS). The kickers have been constructed, tested, and installed in the collider. Measurements of the reflection coefficient at input ports and of the longitudinal and transverse beam coupling impedance have been also performed to characterize the structure and have been compared to the simulation results. A circuital model of general tapered striplines for a first order estimation of the transfer and longitudinal beam coupling impedances is also presented. Finally operational performances are described, pointing out the problems which occurred and the flexibility of the stripline structures that worked with both the short and with the previously installed long pulse generators and have been used as an additional damping kicker to improve the efficiency of the horizontal multibunch feedback system. This system is also a demonstration of the operation of fast kickers with similar characteristics as those for the International Linear Collider (ILC) damping rings (DRs).

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Dynamic devices. A primer on pickups and kickers

Cited by 39 publications

References 8 publications

A linear accelerator bunch length monitor

A linear accelerator bunch length monitor

Conditioning of BPM pickup signals for operations of the Duke storage ring with a wide range of single-bunch current

Design, test, and operation of new tapered stripline injection kickers for thee+e−colliderDAΦNE

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