Beam Dynamics and Electromagnetic Fields




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НазваниеBeam Dynamics and Electromagnetic Fields
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Type of presentation requested : Poster

Classification : [D01] Beam Optics - Lattices, Correction Schemes, Transport


878 - Recent Development and Progress in the UNILAC High Intensity Upgrade Program
S. Richter, W. Barth, L. Dahl, J. Glatz, L. Groening, GSI, Darmstadt

In the framework of the beam intensity upgrade program of GSI the UNILAC was modified to accelerate intense heavy ion beams under space charge conditions. This paper gives an overview on the highest ion intensities achieved and on recent beam line improvements. During 2001 beam intensities of up to 15 emA Ar10+ were achieved demonstrating that the design intensities were met for ions of intermediate mass numbers. For the heaviest ions like U73+ intensities of 0.5 emA were obtained so far and a further increase to the design intensity of 4.6 emA is envisaged for the future.

In the beginning of 2002 the focussing strength during beam acceleration in the Alvarez section was optimized in order to reduce the space charge induced growth of transverse beam emittances. The reduction from 15 to 10 Single-Gap-Resonators allowed the introduction of alternating phase focusing and the elimination of the strong magnetic focusing by dc quadrupoles in the resonators. Beam dynamics behavior now resembles that of a drift space. Despite of the reduction any desired energy in the range of 3.6 to 13 MeV/u (uranium) can still be obtained from seven discrete Alvarez tank output energies. Two recently installed octupole magnets in the beam line for the super heavy element production setup (SHIP) allow the flattening of an initial Gaussian beam shape to a nearly rectangular transverse density distribution. This permits to increase an integrated on-target-intensity by a factor of three.

Type of presentation requested : Poster

Classification : [D01] Beam Optics - Lattices, Correction Schemes, Transport


1744 - MATLAB-based LOCO
J. Safranek, G. Portmann, A. Terebilo, SLAC SSRL, Stanford

The storage ring linear optics debugging code LOCO [1] has been rewritten in MATLAB and linked to the accelerator modeling code AT [2]. LOCO uses the measured orbit response matrix to determine quadrupole gradients. A MATLAB GUI provides a greatly improved user interface with graphical display of the fitting results. The option of including the shift in orbit with rf frequency in the orbit response matrix has been added, so that the dispersion is included in the fit. This facilitates control of the horizontal dispersion, which is important for achieving small horizontal emittance. Also included are error bar calculation, outlier data rejection, accomodation of single-view BPMs, and the option of including coupling in the fit. The code was written to allow linking to other accelerator modeling codes.

[1] J. Safranek, Nucl. Inst. and Meth. A388, 27 (1997).

[2] http://www-ssrl.slac.stanford.edu/at/

Type of presentation requested : Poster

Classification : [D01] Beam Optics - Lattices, Correction Schemes, Transport


1023 - Linear Optics during the RHIC 2001-2 Run*
T. Satogata, J. Cardona, V. Ptitsyn, S. Tepikian, J. van Zeijts, BNL, Upton, Long Island, New York

The RHIC 2001-2 Au and polarized proton runs used several different low-beta optics configurations. Low-beta squeezes were routinely performed through the Au acceleration ramp to optimize injection and transition optics; the polarized proton run injected and accelerated with constant low-beta optics to optimize polarization efficiency. Dispersion analysis were successfully used to diagnose power supply miswirings early in the Au run. This paper summarizes tools, methods and results for linear optics measurement and correction during these runs.

Work performed under the auspices of the US Department of Energy

Type of presentation requested : Poster

Classification : [D01] Beam Optics - Lattices, Correction Schemes, Transport


1025 - Model-Independent Analysis Methods Applied to RHIC Injection*
T. Satogata, W. Fischer, J. van Zeijts, BNL, Upton, Long Island, New York

During the RHIC 2001-2 Au and polarized proton runs, orbit data were routinely acquired for injected tuning bunches in the AGS to RHIC transfer line (ATR) and at all beam position monitors (BPMs) in each RHIC ring. Few parameters were changed, usually limited to injection dipole steering magnets during a typical tuneup of 10-20 pilot bunches. Though these statistics are low, the 1000+ turns of orbit data acquired at all RHIC BPMs for each injection are analyzed using singular value decomposition and model-independent analysis techniques to give information about RHIC BPM performance, injection pulsed-element and ATR performance, and RHIC injection optics.

* Work performed under the auspices of the US Department of Energy

Type of presentation requested : Poster

Classification : [D01] Beam Optics - Lattices, Correction Schemes, Transport


1554 - Simulation of Dark Current Transport through the TESLA Test Facility Linac
H. Schlarb, DESY, Hamburg

The transported dark current in a high-duty cycle accelerator as the TESLA Test Facility linac (TTF) could significately condtribute to radiation damages of components along the beamline. In the past high dark currents emitted from the laser driven RF-gun have been observed during substantial time of linac operation. For a better understanding of the dark current transported through and lost in the entire linac numerical simulations are compared with experimental data. To identify possible locations for collimators to remove the dark current from the beamline the beam and its halo have been investigated in details. The operation of an absorber recently installed in the dispersive section of TTF magnetic bunch compressor and its impact on the downstream collimator section is discussed.

Type of presentation requested : Poster

Classification : [D01] Beam Optics - Lattices, Correction Schemes, Transport


1621 - Modelling the Magnet Lattice of the Dortmund Electron Accelerator
G. Schmidt, U. Berges, J. Friedl, M. Grewe, D. Schirmer, T. Weis, K. Wille, D. Zimoch, DELTA, Dortmund

The Dortmund Electron Accelerator (DELTA) is a 1.5 GeV synchrotron light source. DELTA uses a strong focusing magnet structure. The distance of magnets is small and quadrupoles, steerers and sextupoles use the same magnet yoke. Magnet fields were measured taking into account the interference of the different type of fields. The modelling finally uses beam based methods to measure beta-functions and to adapt the lattice model. The methods and results will be presented.

Type of presentation requested : Poster

Speaker :
Mr. Marc Grewe

Classification : [D01] Beam Optics - Lattices, Correction Schemes, Transport


690 - Design of the Conventional Magnets for BEPC-II
C. Shi, Z. Cao, G.L. Ni, Y. Sun, Z. Yin, IHEP, Beijing

Beijing Electron Positron Collider (BEPC) is now undergoing an upgrade program, BEPC-II project. Which will be upgraded to a double ring machine in the near future. The paper brief introduces conceptual design of several kind conventional magnets for BEPC-II. The magnetic field calculation and structure design of are describled in this paper. Also given is the basic parameters of the magnets.

Type of presentation requested : Poster

Classification : [D01] Beam Optics - Lattices, Correction Schemes, Transport


666 - Improvement of Beam Stability of SPring-8 Storage Ring by Symmetry Restoration
Hitoshi Tanaka, N. Kumagai, S. Matsui, J. Schimizu, K. Soutome, M. Takao, H. Takebe, K. Tsumaki, JASRI/SPring-8, Hyogo; K. Kumagai, RIKEN, Saitama

In general, it is known that the distortion of beam optics excites accidental resonance lines near an operation point and hence it limits the stability of circulating beams. Through 4 by 4 beam response analysis we have recently seen that the optics distortion in the SPring-8 storage ring is increased after the modification to install four magnet-free long straight sections of 27m [1] and the r.m.s. distortion reaches to 7~8 % of a design value. Particle tracking also showed that this distortion limits the beam stability especially at the large amplitude of a betatron oscillation. To improve the beam stability, we have investigated the correction scheme based on the beam response analysis. And then, we have found that the small adjustment on strength of the twelve quadrupoles suppresses the distortion down to ~1% and recovers the beam stability sufficiently. In this paper, we will present our correction scheme and discuss the obtained results compared with the simulation ones.

[1] H. Tanaka et. al., to be published in N.I.M.

Type of presentation requested : Poster

Speaker :
Dr. Hitoshi Tanaka

Classification : [D01] Beam Optics - Lattices, Correction Schemes, Transport


1289 - Lifetime Measurements at MAX II
E. Wallén, Å. Andersson, G. LeBlanc, University of Lund, Lund

A set of measurements with moveable aperture restrictions combined with varying the bunch size in the 1.5 GeV electron storage ring MAX II has been carried out. The measurements make it possible to make a distinction between the Touschek lifetime and the vacuum lifetime limitations. The work has been carried out in order to find out what minimum gap that can be tolerated for new insertion devices in MAX II and similar storage rings.

Type of presentation requested : Poster

Classification : [D01] Beam Optics - Lattices, Correction Schemes, Transport


378 - Optics Measurements at the SPS Using Closed Orbit Response
J. Wenninger, CERN, Geneva

As an injector for the LHC collider, the SPS must accelerate and extract very intense and bright beams. First optics measurements have been performed using the orbit response to steering magnet kicks. The data was analysed with the LOCO program in order to refine the machine optics model. First tests of this procedure for the very long transfer lines between the SPS and the LHC will also be presented.

Type of presentation requested : Poster

Classification : [D01] Beam Optics - Lattices, Correction Schemes, Transport


268 - Design of the DARHT-II Downstream Beamline*
G.A. Westenskow, L. Bertolini, Y.-J. Chen, A. Paul, LLNL, Livermore

This paper describes the mechanical design of the downstream beam transport line for the second axis of the Dual Axis Radiographic Hydrodynamic Test (DARHT-II) Facility. The DARHT-II project is a collaboration between LANL, LBNL and LLNL. DARHT II is a 18.4-MeV, 2000-Amperes, 2-microsecond linear induction accelerator designed to generate short bursts of x-rays for the purpose of radiographing dense objects. The down-stream beam transport line is approximately 22-meter long region extending from the end of the accelerator to the bremsstrahlung target. Within this proposed transport line there are 12 conventional solenoid, quadrupole and dipole magnets; as well as several speciality magnets, which transport and focus the beam to the target and to the beam dumps. There are two high power beam dumps, which are designed to absorb 80-kJ per pulse during accelerator start-up and operation. Aspects of the mechanical design of these elements are presented.

* This work was performed under the auspices of the U.S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under Contract No. W-7405-Eng-48.

Type of presentation requested : Poster

Classification : [D01] Beam Optics - Lattices, Correction Schemes, Transport


269 - Performance of the FXR Accelerator*
G.A. Westenskow, Y.-J. Chen, G. LeSage, M. Ong, J.M. Zentler, LLNL, Livermore

The FXR induction accelerator is used as a radiographic tool at LLNL to produce short intense x-ray pulses. During the past year we have studied the performance of the accelerator in an attempt to reduce the final beam spot size. We will report on various measurements of the beam's emittance and energy spread. We have made time resolved measurements near the injector and at the end of the accelerator. To produce smaller spots at the x-ray converter target we will need to modify the pulse power drive system to reduce the voltage variations on the induction cells during the pulse. We are also performing simulations of the injector to understand the large emittance that was measured.

*This work was performed under the auspices of the U.S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under Contract No. W-7405-Eng-48.

Type of presentation requested : Poster

Classification : [D01] Beam Optics - Lattices, Correction Schemes, Transport


1651 - Beta Function Measurements in the PEP-II Low Energy Ring
U. Wienands, SLAC, Stanford; M.E. Biagini, INFN-LNF, Frascati (Roma)

The Low Energy Ring of PEP-II has 90-degree cells in the arc sections which prevent the measurement of the beta functions using the local method as implemented e.g. at LEP by P. Castro et al. We present a modified algorithm that is able to circumvent this restriction and has proven to give reliable results. The improved algorithm has been used to diagnose changes in the beta functions especially in response to different setups of the machine. In particular, a significant beta beat developed when changing the horizontal working point towards 0.5, the origin of which is presently under study.

Type of presentation requested : Poster

Classification : [D01] Beam Optics - Lattices, Correction Schemes, Transport


856 - Initial Results from Model Independent Analysis of the ATF*
A. Wolski, A. Jackson, LBNL, Berkeley

Model Independent Analysis (MIA) has shown the potential to be a useful tool for diagnostics and optics verification. The Accelerator Test Facility (ATF) prototype damping ring at KEK has a diagnostic system with the ability to collect data allowing the application of MIA for analysis of the optics and beam properties, including stability of the injection energy and transverse action. Understanding of the optics (particularly the coupling), and of the injection stability, is important for improving the operational performance of a damping ring, in terms of the emittance and injection efficiency. MIA affords the opportunity for study of these features, which may be difficult to assess by other means. We report here the results of an initial attempt to apply MIA to the ATF.

*Work supported by the US DOE under contract DE-AC03-76SF00098


DISCLAIMER

This document was prepared as an account of work sponsored by the United States Government. While this document is believed to contain correct information, neither the United States Government nor any agency thereof, nor The Regents of the University of California, nor any of their employees, makes any warranty, express or implied, or assumes any legal responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by its trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof, or The Regents of the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof, or The Regents of the University of California.


Ernest Orlando Lawrence Berkeley National Laboratory is an equal opportunity employer.
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