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Proceedings of International Conference on Particle Accelerators

17-20 May 1993

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Displaying Results 1 - 25 of 1298
  • The RF cavity for DA/spl Phi/NE

    Publication Year: 1993, Page(s):778 - 780 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (393 KB)

    The achievement of the highest luminosity in the 510 MeV electron-positron /spl Phi/-Factory DA/spl Phi/NE, in construction at Frascati Laboratories, requires a careful design of the RF accelerating cavity, being the main source of High Order parasitic Modes (HOM) which are responsible for multibunch instabilities. Intense R&D has been carried out to choose the cavity resonator which would better ... View full abstract»

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  • Design of the e/sup +e/sup -/ Frascati linear accelerator for DA/spl Phi/NE

    Publication Year: 1993, Page(s):611 - 613 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (274 KB)

    The electron-positron accelerator for the DA/spl Phi/NE project is under construction at Titan Beta in Dublin, CA. This S-band RF linac system utilizes four 45 MW sledded klystrons and 16 3 m accelerating structures to achieve the required performance. It delivers a 4 ampere electron beam to the positron converter and accelerates the resulting positrons to 550 MeV. The converter design uses a 4.3 ... View full abstract»

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  • 200 MeV RF linac for Brookhaven National Laboratory

    Publication Year: 1993, Page(s):608 - 610 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (373 KB)

    A 200 MeV RF linac was designed and built for Brookhaven National Laboratory. Factory tests have now been completed and it is in final assembly for use at Brookhaven. The authors give the overall requirements of the linac. The system consists of four 3 m sections of S-band accelerator waveguide powered by three 45 MW Thomson klystrons. The injector is comprised of a triode gun, prebuncher, and a f... View full abstract»

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  • Proceedings of International Conference on Particle Accelerators

    Publication Year: 1993
    Request permission for commercial reuse | PDF file iconPDF (578 KB)
    Freely Available from IEEE
  • Emittance growth in MEB and its control

    Publication Year: 1993, Page(s):3558 - 3560 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    There are effects in the Medium Energy Booster (MEB) of the SSC which will lead to growth of the transverse beam emittance. Among them are space charge, decoherence due to residual chromaticity and nonlinearity of field, coherent instabilities, etc. This paper numerically estimates the strength of these effects on the beam stability and the emittance growth. To ensure that the emittance growth is ... View full abstract»

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  • Electron beam quality limitations and beam conditioning in free electron lasers

    Publication Year: 1993, Page(s):1560 - 1562 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    The operation of free electron lasers can be severely limited by the axial velocity spread of the beam electrons. We propose a method for reducing the axial velocity spread in electron beams by redistributing the electron energy via interaction with an axially symmetric, slow, TM waveguide mode. In this method, the energy redistribution is correlated with the electrons' betatron amplitude. Reducti... View full abstract»

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  • Plasma focussing of the Final Focus Test Beam

    Publication Year: 1993, Page(s):3555 - 3557 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    The focusing of the Final Focus Test Beam by means of a plasma is studied by means of models, based on theory and simulation. A set of parameters for a test of various aspects of plasma focusing is presented with attention to the limitations of diagnostic schemes available presently at the FFTB View full abstract»

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  • On using the thin target at extraction of protons from the accelerators by bent crystal

    Publication Year: 1993, Page(s):324 - 326 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    The influence of a thin target on the bent crystal extraction efficiency at 70 GeV is discovered in the IHEP accelerator. This effect was also confirmed at 50 GeV. It is supposed that the effect can be used for beam extraction from higher energy accelerators View full abstract»

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  • Design and experiment of SG-1 FEL

    Publication Year: 1993, Page(s):1557 - 1559 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    SG-I FEL is a Raman free electron laser amplifier, with a wavelength of 8-9 mm, based on an induction linac. The SC-I FEL contains a 3.5 MeV accelerator, an electron beam transport system, a tapered electromagnetic wiggler, a microwave source and a computer-controlled system. The design and numerical simulation and experimental results are presented View full abstract»

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  • IPROP simulations of the GAMBLE II proton transport experiment

    Publication Year: 1993, Page(s):3549 - 3551 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    We have simulated the proton transport of the 6-kA, 1-MV GAMBLE II experiment using a modified version of the IPROP particle-in-cell code. IPROP now uses a hybrid model in which plasma electrons are divided into high-energy macro particle and thermal-fluid components. This model includes “knock-on” bound-electron collision and runaway sources for high-energy electrons. Using IPROP, we ... View full abstract»

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  • A digital computer program for the simulation of positive or negative particle beams on a PC

    Publication Year: 1993, Page(s):327 - 329 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    PBGUNS, an expanded and improved version of the SNOW2D code for extracted ion beams will be described and demonstrated. The new code includes the electrode description and electron beam capabilities of the SPEED code. The new version includes positive and negative ion beam extraction systems and may include skew1 (azimuthal energy particles) permitting the simulation of thermal effects ... View full abstract»

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  • Diagnostics development for high current electron accelerators at CESTA

    Publication Year: 1993, Page(s):2115 - 2117 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    Some applications of induction accelerators require high quality electron beams and among them we are mainly interested in free electron laser (FEL) experiments and the achievement of the AIRIX high performance Radiographic Hydrotest Facility. In both cases small emittance and energy spread are needed to fulfil the experimental requirements. Beam diagnostics have been developed in order to allow a... View full abstract»

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  • Energy Storage Inductor for the Low Energy Booster resonant power supply system

    Publication Year: 1993, Page(s):1297 - 1299 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    The Energy Storage Inductor (ESI) is an important part of the Low Energy Booster (LEB) Resonant Power Supply System. The ESI is a 40 mH, 3400 A, two-legged, picture frame, ONAN-cooled, linear inductor. The ESI is currently under construction at the UETM plant in Ekaterinburg (Russia) as a part of an inter-laboratory collaborative agreement between BINP (Russia) and SSCL (USA). This paper gives an ... View full abstract»

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  • Strong-weak beam-beam simulation with a six dimension symplectic code

    Publication Year: 1993, Page(s):3497 - 3499 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    By using a symplectic code in the six dimensional phase space, we have tried to study beam blow-up due to the combined effect of the beam-beam force and the other non-linear forces from the lattice. Tune dependence of beam blow-up was studied. With the nominal beam-beam parameters of the KEK B factory (0.05), some beam blow-up was observed in the simulation. The simulation showed that the beam-bea... View full abstract»

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  • A new study of the Main Ring physical aperture

    Publication Year: 1993, Page(s):2252 - 2253 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    Changes made to the Fermilab Main Ring lattice and the Main Ring's future importance for the HEP program require a new study of its physical aperture. This task has been carried out using a computer program that automatically and systematically measures the available aperture around the ring. This program and its performance are described along with a preliminary analysis of the results. Further s... View full abstract»

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  • Numerical studies of strong focusing in planar undulators

    Publication Year: 1993, Page(s):1548 - 1550 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    The present trend towards short wavelength operation with long undulators places tight requirements on the electron beam quality and hence the need to maintain a well focused beam. This paper examines the performance of alternating gradient (AG) sextupole focusing in planar undulators. Numerical simulation results of free electron laser performance using AG sextupole focusing are compared to resul... View full abstract»

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  • Numerical modelling of time-space behavior of high-current relativistic electron beam in plasma waveguide

    Publication Year: 1993, Page(s):3546 - 3548 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    The physical processes in a magnetized plasma waveguide, in which a high-current relativistic electron beam (Sudan parameter S>1) is injected, are investigated by the developed 2.5-D relativistic electromagnetic code. The computer study has shown that the charge and current compensations of the high-current beam are considerably different from those of the low-current beam. In addition the self... View full abstract»

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  • The impact of new accelerator control software on LEP performance

    Publication Year: 1993, Page(s):1937 - 1939 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    After the first year of running LEP, it became apparent that a new generation of application software would be required for efficient long term exploitation of the accelerator, In response to this need, a suite of accelerator control software has been developed, which is new both in style and functionality. During 1992 this software has been extensively used for driving LEP in many different opera... View full abstract»

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  • Antiproton extraction in the Fermilab antiproton accumulator

    Publication Year: 1993, Page(s):330 - 332 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The RF and other manipulations required to extract antiprotons from the accumulator core for collider operation are described. ESME simulations of the motion in longitudinal phase space are shown. Measurements of the emittances of the extracted antiprotons are presented. The effect of the unstacking process on the core longitudinal and transverse emittances is examined and recent performance is al... View full abstract»

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  • Results of prototype particle-beam diagnostics tests for the Advanced Photon Source (APS)

    Publication Year: 1993, Page(s):2112 - 2114 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The Advanced Photon Source (APS) will be a third-generation synchrotron radiation source (hard X-rays) based on 7-GeV positrons circulating in a 1104-m circumference storage ring. In the past year a number of the diagnostic prototypes for the measurement of the charged-particle beam parameters throughout the subsystems of the facility (ranging from 450-MeV to 7-GeV positrons and with different pul... View full abstract»

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  • The ALS Gun Electronics system

    Publication Year: 1993, Page(s):3058 - 3060 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    The ALS Gun Electronics system has been designed to accommodate the gun with a custom made socket and a high speed electronics circuit which is capable of producing single and multiple electron bunches with time-jitters measured at better than 50 ps. The system generates the gated RF signal at ground level before sending it up to the 120 kV-biased gun deck via a fiber optic cable. The current puls... View full abstract»

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  • A high power water cooled resistor for the high voltage power supply in the TRIUMF RF system

    Publication Year: 1993, Page(s):1300 - 1302 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The TRIUMF RF system high voltage power supply requires 0.5 ohm current limiting resistors to protect amplifier components during transients and crowbar operations. The crowbar typically causes a 16000 amp transient pulse, followed by a 4000 amp current for 55 ms until the circuit breaker opens. The resulting stresses produced catastrophic failure of the original design within 100 crowbar cycles. ... View full abstract»

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  • A numerical check of the thermal wave-model for particle-beam dynamics

    Publication Year: 1993, Page(s):209 - 211 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The recently proposed thermal wave model for transverse particle-beam dynamics is tested numerically in the case of propagation through a quadrupole lens with sextupole deviations. This check is performed by comparing the model predictions, obtained analytically using perturbation theory at first order, with the results of a conventional tracking code. The results of this comparison are shown here... View full abstract»

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  • Collective effects in the VEPP-3 storage ring

    Publication Year: 1993, Page(s):3669 - 3671 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    Lengthening of a single bunch has been investigated in the VEPP-3 storage ring at different energies for a beam current up to 100 mA. The bunch length was measured using an optical diagnostic system. The current dependences of the transverse beam size, synchronous phase shift, and the coherent and incoherent synchrotron tune shift have been measured. The experimental data are in agreement with the... View full abstract»

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  • Injector design for high-current cw proton linacs

    Publication Year: 1993, Page(s):3166 - 3168 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    We present an injector design for high-power cw proton linacs with particular emphasis on intense neutron-spallation sources. Long-term operational reliability and availability dominate over specific beam parameters for these accelerators. We discuss technical requirements for the ion source and low-energy beam transport line and compare different options. A prototype design for a 75-kV, 110-mA cw... View full abstract»

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