Experimental performance of an 
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 chopper system

Wiesner, Christoph; Droba, M.; Meusel, O.; Noll, Daniel; Payir, Onur; Ratzinger, U.; Schneider, Philipp‐Immanuel

doi:10.1103/physrevaccelbeams.20.020101

Cited by 6 publications

(3 citation statements)

References 26 publications

(27 reference statements)

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“…Conventional Wien filters incorporate electrostatic and magnetostatic and are used mainly as mass and velocity seperators. Another form of Wien filter that incorporates a pulsed electric field and a static magnetic field, is used for beam chopping purposes [3] only.…”

Section: State Of the Artmentioning

confidence: 99%

The driving circuit of the waveguide RF Wien filter for the deuteron EDM precursor experiment at COSY

et al. 2020

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The waveguide RF Wien filter is one of the key components of the JEDI project at the COoler SYnchrotron in Jülich. The driving circuit constitutes a fundamental part of the waveguide RF Wien filter. When running at the spin precession frequency, the driving circuit must ensure that the load impedance is set to the correct complex value so that the electric and magnetic fields are matched, leading to a vanishing Lorentz force during operation at high power levels up to 10 kW. This paper discusses the design, simulation, realization and performance analysis of the RF Wien filter driving circuit. K: Hardware and accelerator control systems; Instrumentation for particle accelerators and storage rings -high energy (linear accelerators, synchrotrons); Instrumentation for particle accelerators and storage rings -low energy (linear accelerators, cyclotrons, electrostatic accelerators) 1Corresponding author.

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Section: State Of the Artmentioning

confidence: 99%

The driving circuit of the waveguide RF Wien filter for the deuteron EDM precursor experiment at COSY

et al. 2020

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“…Electrostatic deflectors (electric kickers), magnets (magnetic choppers), or electromagnetic choppers (E × B choppers) can be used to cut the beam. The Frankfurt Neutron Source at the Stern-Gerlach-Zentrum (FRANZ) [3] has designed an E × B chopper based on an electromagnet, which has been successfully commissioned, but there are still some problems that need to be addressed [4]. Firstly, the conventional magnet is still driven by the power supply, which can be avoided by using a permanent magnet.…”

Section: Introductionmentioning

confidence: 99%

Design of an E × B chopper based on permanent magnets

Jia,

Wang,

et al. 2024

J. Phys.: Conf. Ser.

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Chopper systems are typically used to provide beam time structure and ensure the safety of accelerator operation by deflecting the beam away. The reliability of conventional choppers is entirely based on high-voltage (HV) pulsed power supplies. However, when the power supply fails to charge the electrostatic deflection plate, the beam cannot be cut off, and it will enter the downstream accelerator. To meet the strict beam stopping time requirements of the China Initiative Accelerator Driven System (CiADS), novel E × B chopper design has been developed based on a permanent magnet and an electrostatic deflection plate. This design not only ensures the safety of the accelerator but also provides the necessary pulse waveform. The device is small, highly reliable, and suitable for most accelerators. Moreover, beam dynamics simulations have been conducted to evaluate the chopper’s influence on beam quality, and its beam cutting capability has been analyzed.

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“…These structures require high voltage (HV) pulse rise and fall times of several nanoseconds to avoid partially deflected pulses that generate unwanted beam loss. Novel examples for high current include an E × B field chopper system described by Wiesner et al [8], and a chopping system based on a new Einzel lens described by Leo et al [9].…”

Section: Introductionmentioning

confidence: 99%

Fast chopper for single radio-frequency quadrupole bunch selection for neutron time-of-flight capabilities

Shor

Kaizer

Eliyahu

et al. 2019

Phys. Rev. Accel. Beams

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A fast chopper system has been developed and tested for single bunch selection with the radio-frequency quadrupole (RFQ) accelerating element of the Soreq Applied Research Accelerator Facility (SARAF). The fast chopper consists of a high voltage (HV) deflector just before the RFQ, providing both positive and negative HV deflections and fast HV switching between polarities to enable momentary transmission of a single prebunch to the RFQ. Presently, the system enables single bunch selection for protons and deuterons at a repetition rate as determined by the user of up to 200 kHz, with bunch transmission of up to 50%, and with neighboring bunch contamination of less than 15%. Single bunch selection provides SARAF with fast neutron time-of-flight (TOF) capabilities. Measurements performed with liquid scintillation detectors show clear gamma and neutrons peaks, with TOF resolution of about 1 nanosecond FWHM. Beam dynamics simulations suggest possibilities for further improvements of the fast chopper and single bunch selection characteristics, with a significant lowering or elimination of the neighboring bunches, enhanced TOF resolution, and increased repetition rate to above 200 kHz. Fast neutron TOF capabilities, especially at phase II of SARAF, will provide exceptional opportunities for neutron induced reaction measurements for nuclear technology and fundamental research.

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Experimental performance of an E×B chopper system

Cited by 6 publications

References 26 publications

The driving circuit of the waveguide RF Wien filter for the deuteron EDM precursor experiment at COSY

The driving circuit of the waveguide RF Wien filter for the deuteron EDM precursor experiment at COSY

Design of an E × B chopper based on permanent magnets

Fast chopper for single radio-frequency quadrupole bunch selection for neutron time-of-flight capabilities

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