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in subjects: "Kicker Magnets"

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Air-core kicker magnets with and without metallic enclosure

Estimations have been made for the design of air-core kicker magnets with the given specification, under the condition of having and without having an enclosure. It is found that the kicker magnet contained in a cylindrical enclosure of a radius equal to the spacing of the fields winding will require an amount double the electrical power and 40% more in excitation current. However, these quantities decrease rapidly with the increase of the cylinder's radius. It is recommended that a radius of 1… more

Date: April 1978

Creator: Sun, Rai-Ko

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Damping coherent phase oscillations by means of path-length modulation

Multi-bunch storage rings and synchrotrons are typically plagued by a tendency for the bunches to indulge in unstable coherent phase oscillations engendered by their electromagnetic interactions with the vacuum chamber. In many machines feedback systems have been used successfully to damp these oscillations using a signal proportional to the coherent phase motion or the concomitant energy motion to control an auxiliary longitudinal electric field. The purpose of this note is to describe an alte… more

Date: June 1, 1978

Creator: Rees, J.R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Intense pulsed neutron source (IPNS-I) accelerator 500 MeV fast kickers

Two ferrite loaded picture frame magnets with a kick of up to 15 mrad each are used to extract 500 MeV protons from the IPNS-I accelerator to the neutron source target at the Argonne National Laboratory. The magnet aperture is 10 cm wide by 5 cm high and the length is 60 cm. The single bunch extraction requires a magnetic field rise time (0 to 100%) of 90 ns and a flattop of 100 ns. The magnets receive the 3600 A maximum current via an array of 50 ..cap omega.. coaxial cables connected in a shu… more

Date: January 1, 1979

Creator: Suddeth, D. E. & Volk, G. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Application of matrix formalism to problems with memory

On an example of the transverse one-dimensional coherent bunch motion in the presence of feedback, we developed a matrix formalism which allows us to find the decrement (or increment) and the tune shift of the motion due to a feedback system which remembers many previous passages of the bunch. The derived formulae are applied to a particular case of exponential decay of a resonant kicker signal. The possible detuning of the kicker resonator is also considered. The formulae are further applied t… more

Date: October 1, 1979

Creator: Kheifets, S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Rapid Cycling Synchrotron (RCS) sngle-stage kicker magnet

A new single stage kicker magnet system is designed and is being fabricated for the RCS accelerator of the Intense Pulsed Neutron Source (IPNS-I) at the Argonne National Laboratory. This system will replace the two stage kicker in present use. The magnet aperture is 10 cm wide by 5 cm high and the magnetic length is 0.89 m. The magnetic field intensity is 0.1021 T for a 25 milliradian kick to the 500 MeV proton beam. A field rise time (10 to 90%) of 80 ns and a flattop of 100 ns is needed. The … more

Date: January 1, 1980

Creator: Suddeth, D. E. & Volk, G. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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New AGS fast extraction system

Both the high energy physics program and ISA injection require an improved fast extraction system from the AGS. The proposed new system consists of a fast kicker at H5 and an ejector magnet at H10. The H5 kicker is capable of producing 1.2 mrad deflection and rising up to 99% strength in 150 nsec with flat top ripple within +- 1%. It is found that the focusing strengths and positions of UQ3-UQ7 have to be modified to achieve an achromatic condition at the end of 8/sup 0/-bend. Also, the concept… more

Date: September 1, 1980

Creator: Weng, W. T.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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THE AGS FAST KICKER MAGNET SYSTEM*

A new fast extraction system from the AGS will be implemented to improve the neutrino beam and to serve for ISABELLE injection. The fast kicker for the system is of an open C-type design with a field strength of 1.25 kG at 2650 amperes. The pulser system is a mismatched, discharge type PFN which is capable of delivering a pulse of 3000 amperes peak current at 30 kV dc, with a 2.7 ..mu..sec pulse width, 170 nsec rise time, and flat top ripple within +-1%. It also serves as a prototype for an ISA… more

Date: January 1, 1981

Creator: Weng, W. T.; Cottingham, J. G.; Foelsche, H.; Frey, W.; Ghoshroy, S.; Schmidt, C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Design of fast kickers for the ISABELLE beam abort system

The ISA beam abort (extraction) system must be highly efficient, in the sense of producing minimum beam loss, and reliable to prevent serious damage to accelerator components by the circulating high-energy beams. Since the stored beams will be debunched, the low-loss requirement can be met only with ultra-thin extraction septa and/or fast-acting kickers. This paper examines the design of the ISA extraction kickers subject to a set of extraction channel constraints and a given maximum working vo… more

Date: January 1, 1981

Creator: Nawrocky, R.J.; Montemurro, P.A. & Baron, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Rapid-Cycling Synchrotron extraction-kicker magent-drive system

The Rapid-Cycling Synchrotron (RCS) accelerator of the Intense Pulsed Neutron Source-I (IPNS-I) at Argonne National Laboratory utilizes a fast kicker magnet to provide single-turn extraction for a 500-MeV proton beam at a 30 Hz rate. The single-turn, 0.89-m-long ferrite magnet is broken up into two identical cells with four individual windings. Each winding requires a 4863-A magnetizing current into a 7.0-..cap omega.. load with a rise time of less than 100 ns and a flattop of about 140 ns. Pul… more

Date: January 1, 1981

Creator: Suddeth, D. E. & Volk, G. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Theoretical treatment of transverse feedback systems with memory

The differential equation of the dipole moment of coherent oscillations in the presence of a feedback system is derived. The analysis, which starts in the time domain, is extended to the frequency domain; this allows a straightforward derivation of the damping rate for both coasting and bunched beams. The damping rate is expressed in terms of the transfer function of the feedback system and in a general form which takes into account the ..beta..-function and betatron phase modulation along the … more

Date: January 1, 1981

Creator: Cornacchia, M. & Wang, J.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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H5 fast-kicker-magnet pulser

The fast extraction kicker magnet for the AGS is powered by a novel pulse generator. A pulse forming network (PFN) is discharged into nearly 100% mismatched load. The pulser delivers a current pulse of 3000 amperes peak pulse with a 2% flat-top ripple into a 1.4 ..mu.. H single turn ferrite core magnet. The pulse is 2.8 ..mu..sec wide with a 180 nsec rise time, at a 0.5 to 1.5 pps repetition rate. The pulse rise time is required to provide clean extraction of the 28 GeV proton beam by bringing … more

Date: January 1, 1982

Creator: Frey, W.; Ghoshroy, S. & Cottingham, J.G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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AGS new fast extraction system and the single bunch extraction test

For the neutrino physics program and for the CBA injection, a new fast extraction system has been implemented to improve the extraction efficiency and the quality of the extracted beam. Central to the new system is a new fast kicker, placed at the H5 straight section, capable of rising between bunches, t/sub r/ < 170 nsec, and staying constant for 2.6 ..mu..sec with flat top ripple less than +-1.5%. So far, the system has been operated for longer than 3000 hours and routinely extracts 10/sup 13… more

Date: January 1, 1983

Creator: Weng, W. T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Beam transfer and extraction at LAMPF II

Protons will be single-turn extracted from the LAMPF II synchrotron at 30 Hz. On alternate pulses they will be single-turn injected into a storage ring. Both processes utilize fast kickers and Lambertson septum magnets. Half-integer resonant extraction will be used to slow-extract the beam from the storage ring over a time spread of 1/15 s. The slow extraction occurs using electrostatic wire and iron septa.

Date: January 1, 1983

Creator: Colton, E. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Explicit Expression of the Electric Field in the Kicker

No Description Available.

Date: January 1, 1983

Creator: Takayama, Ken

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Low-coupling impedance double-helix structure for use in a ferrite kicker magnet

In a machine such as the CBA, the ejection ferrite kicker magnet has a very large longitudinal and transverse coupling impedance which could destroy the beam. Using a double-helix structure that surrounds the beam, the beam-induced fields are confined within the helix and, therefore, decoupled from the kicker; but at the same time the helix is transparent to the external fields of the kicker. At first, this may seem paradoxical that the helix is opaque to the fields generated inside the structu… more

Date: January 1, 1983

Creator: Giordano, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Single-bunch kicker pulser

The single-bunch kicker magnet is powered by a capacitor discharge pulser. The ferrite-core magnet is used to kick out one of twelve proton bunches circulating in the AGS (Alternating Gradient Synchrotron) into the experimental area. The magnet current pulse has a half-sinusoid shape, with a peak current of 2800 A. The pulse current rises and falls to zero, with minimum undershoot, in 410 nsec to minimize effects on adjacent bunches. The magnet inductance is 1.0 ..mu..Hy. The pulser is mounted … more

Date: January 1, 1983

Creator: Frey, W.W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Spiral kicker for the beam abort system

A brief study was carried out to determine the feasibility of a special kicker to produce a damped spiral beam at the beam dump for the beam abort system. There appears to be no problem with realizing this concept at a reasonably low cost.

Date: January 1, 1983

Creator: Martin, R.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Update on Beam Extraction

At the time of the 1981 Workshop on Experimental Use of the SLC, we published an extraction scheme for the MINIQUAD final focus (FF) optics. Since then a different FF optics design has been selected. With the same achromat section and outboard telescope, it allows a number of options for the inboard telescope. This note describes the new extraction system and briefly considers electron-electron extraction and the consequences of an extraction kicker malfunction. 4 references, 7 figures, 1 table. more

Date: August 26, 1983

Creator: Keller, Lewis P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Beam-dump kicker magnets

The beam-dump kicker magnets are located in the final focus region and, in conjunction with septum magnets, extract the beams after they have passed the interaction point (IP) and direct them to their respective dumps. Two schemes for these kickers have been under consideration; ferrite transmission line magnets utilizing technology common with damping rings and positron target kickers, and current loop magnets which are possible only for the dump kickers, where the rise time of the magnetic pu… more

Date: December 12, 1983

Creator: Bulos, F.; Odian, A. & Tomlin, B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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PEP inflection

This note describes a possible inflection concept for PEP using the parameters and lattice configurations existing at this time. The proposed method, employing ''beam bump'' and radiation damping of betatron and synchrotron oscillations, is similar to the one successfully used at SPEAR. Some considerations leading to this choice are listed and the resulting component specifications outlined. It is realized that this design may not be the final optimum one but it should permit a conservative cos… more

Date: January 1, 1984

Item Type: Report

Partner: UNT Libraries Government Documents Department

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10-MHz high-voltage modulator with pulse-width and repetition-rate agility

Requirements for control and rapid switching of the proton beam at the Los Alamos Meson Physics Facility (LAMPF) are continually revised to support accelerator upgrades and modifications. A recent upgrade required the development of a 10-MHz high-voltage modulator for an electrostatic kicker with real-time control of pulse width and repetition rate over a range of four decades. The modulator must be capable of producing a voltage pulse across a capacitive load with a rise time of less than or e… more

Date: January 1, 1985

Creator: Krausse, G.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Ferrite kicker magnet for the LAMPF switchyard upgrade

The new LAMPF switchyard requires a kicker magnet as the first element in the transport line leading to the Proton Storage Ring (PSR). The magnet must produce 1-ms-long pulses with 40-..mu..s rise time and <0.3% flat-top regulation to deflect the 800-MeV H/sup -/ beam by 1.2/sup 0/. We have constructed two 1-m-long, single-turn ferrite magnets, each powered by a modulator supplying up to 2400 A at a maximum rate of 24 Hz. The modulators use a transistor amplifier/regulator, a dual pulse-forming… more

Date: January 1, 1985

Creator: Hardekopf, R. A.; Higgins, E. F. & Lunsford, J. S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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SSC kicker impedances

The longitudinal and transverse complex impedances Z/sub l//n and Z/sub t/, respectively, have been calculated for both the SSC injection and abort kickers. The calculations assumed that no attempt was made to shield the beam from the kickers. We took the injection and abort kickers to be as specified. The injection kickers were ferrite with a single-turn design, and the abort kickers were of a ''window-frame design'' with tape wound cores.

Date: January 1, 1985

Creator: Colton, E. P. & Wang, T. F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Synchronous timing of multi-energy fast beam extraction during a single AGS cycle

Synchronous triggering of fast beams is required because the field of Kicker Magnets must rise within the open space between one beam bunch and the next. Within the Brookhaven AGS, Fast Extracted Beam (FEB) triggering combines nominal timing, based on beam energy with bunch-to-bunch synchronization, based on the accelerating rf waveform. During beam acceleration, a single bunch is extracted at 22 GeV/c and within the same AGS cycle, the remaining eleven bunches are extracted at 28.4 GeV/c. When… more

Date: January 1, 1985

Creator: Gabusi, J. & Naase, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department