Download or read book A Discussion of Bunched Beam Stochastic Cooling written by David Neuffer and published by . This book was released on 2005 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The analysis of Herr and Mohl[1] is used as a basis for a discussion of bunched beam cooling in the Fermilab recycler and the Tevatron. Differences between the two cooling regimes are discussed. Criteria discussed in that paper imply the failure of stochastic cooling in the Tevatron while permitting the success of stochastic cooling in the Recycler. These ''predictions'' are in agreement with observations.
Download or read book STOCHASTIC COOLING FOR BUNCHED BEAMS written by and published by . This book was released on 2005 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Problems associated with bunched beam stochastic cooling are reviewed. A longitudinal stochastic cooling system for RHIC is under construction and has been partially commissioned. The state of the system and future plans are discussed.
Download or read book Stochastic Cooling of Particle Beams written by Dieter Möhl and published by Springer. This book was released on 2013-01-08 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: This lecture note describes the main analytical approaches to stochastic cooling. The first is the time domain picture, in which the beam is rapidly sampled and a statistical analysis is used to describe the cooling behaviour. The second is the frequency domain picture, which is particularly useful since the observations made on the beam are mainly in this domain. This second picture is developed in detail to assess key components of modern cooling theory like mixing and signal shielding and to illustrate some of the diagnostic methods. Finally the use of a distribution function and the Fokker-Plank equation, which offer the most complete description of the beam during the cooling, are discussed.
Download or read book Bunched Beam Stochastic Cooling in the Fermilab Recycler Ring written by A. Burov and published by . This book was released on 2005 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stochastic cooling with bunched beam in a linear bucket has been obtained and implemented operationally in the Fermilab Recycler Ring (RR). This is the first time that linear-rf bunched-beam stochastic cooling has been successfully used operationally in a high-energy facility. In this implementation the particle bunch length is much greater than the cooling system wavelengths, and that property is critical to the cooling success. The simultaneous longitudinal bunching enables cooling to much smaller longitudinal emittances than the coasting beam or barrier bucket system. Characteristics and limitations of bunched beam stochastic cooling are discussed.
Download or read book Bunched Beam Stochastic Cooling written by and published by . This book was released on 1992 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stochastic Cooling of Bunched Beams written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical simulation studies are presented for transverse and longitudinal stochastic cooling of bunched particle beams. Radio frequency buckets of various shapes (e.g. rectangular, parabolic well, single sinusoidal waveform) are used to investigate the enhancement of phase space cooling by nonlinearities of synchrotron motion. The connection between the notions of Landau damping for instabilities and mixing for stochastic cooling are discussed. In particular, the need for synchrotron frequency spread for both Landau damping and good mixing is seen to be comparable for bunched beams.
Download or read book BUNCHED BEAM STOCHASTIC COOLING SIMULAITONS AND COMPARISON WITH DATA written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: With the experimental success of longitudinal, bunched beam stochastic cooling in RHIC it is natural to ask whether the system works as well as it might and whether upgrades or new systems are warranted. A computer code, very similar to those used for multi-particle coherent instability simulations, has been written and is being used to address these questions.
Download or read book SUCCESSFUL BUNCHED BEAM STOCHASTIC COOLING IN RHIC written by J. M. BRENNAN and published by . This book was released on 2006 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on a successful test of bunch-beam stochastic cooling in RHIC at 100 GeV. The cooling system is designed for heavy ions but was tested in the recent RHIC run which operated only with polarized protons. To make an analog of the ion beam a special bunch was prepared with very low intensity. This bunch had {approx}1.5 x 10{sup 9} protons, while the other 100 bunches contained {approx}1.2 x 10{sup 11} protons each. With this bunch a cooling time on the order 1 hour was observed through shortening of the bunch length and increase in the peak bunch current, together with a narrowing of the spectral line width of the Scottky power at 4 GHz. The low level signal processing electronics and the isolated-frequency kicker cavities are described.
Download or read book Bunched Beam Stochastic Cooling written by and published by . This book was released on 1992 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The scaling laws for bunched-beam stochastic cooling has been derived in terms of the optimum cooling rate and the mixing condition. In the case that particles occupy the entire sinusoidal rf bucket, the optimum cooling rate of the bunched beam is shown to be similar to that predicted from the coasting-beam theory using a beam of the same average density and mixing factor. However, in the case that particles occupy only the center of the bucket, the optimum rate decrease in proportion to the ratio of the bunch area to the bucket area. The cooling efficiency can be significantly improved if the synchrotron side-band spectrum is effectively broadened, e.g. by the transverse tune spread or by using a double rf system.
Download or read book BUNCHED BEAM STOCHASTIC COOLING PROJECT FOR RHIC written by and published by . This book was released on 2005 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main performance limitation for RHIC is emittance growth caused by IntraBeam Scattering during the store. We have developed a longitudinal bunched-beam stochastic cooling system in the 5-8 GHz band which will be used to counteract IBS longitudinal emittance growth and prevent de-bunching during the store. Solutions to the technical problems of achieving sufficient kicker voltage and overcoming the electronic saturation effects caused by coherent components within the Schottky spectrum are described. Results from tests with copper ions in RHIC during the FY05 physics run, including the observation of signal suppression, are presented.
Download or read book On Stochastic Cooling of Bunched Beams from Fluctuation and Kinetic Theory written by Swapan Chattopadhyay and published by . This book was released on 1982 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book STOCHASTIC COOLING OF HIGH ENERGY BUNCHED BEAMS written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Stochastic cooling of 100 GeV/nucleon bunched beams has been achieved in the Relativistic Heavy Ion Collider (RHIC). The physics and technology of the longitudinal cooling system are discussed, and plans for a transverse cooling system are outlined.
Download or read book Comparison Between Coasting and Bunched Beams on Optimum Stochastic Cooling and Signal Suppression written by and published by . This book was released on 1991 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comparison has been performed between coasting and bunched particle beams pertaining to the mechanism of stochastic cooling. In the case that particles occupy the entire sinusoidal rf bucket, the optimum cooling rate for the bunched beam is shown to be the same as that predicted from the coasting-beam theory using local particle density. However, in the case that particles occupy only the center of the bucket, the optimum rate decreases in proportion to the ratio of the bunch area to the bucket area. Furthermore, it has been shown for both coasting and bunched beams that particle motion is stable upon signal suppression if the amplitude of the gain is less than twice the optimum value over the entire frequency bandwidth of the cooling system. 7 refs., 1 fig.
Download or read book Brighter Beams for Better Physics written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: At the Relativistic Heavy Ion Collider at Brookhaven Lab, nuclei of gold atoms are collided with enough force to recreate on a tiny scale the hot, dense conditions that existed about one-hundredth of a second after the Big Bang. By packing so much energy into a small area, these collisions allow physicists to study fundamental constituents of matter -- quarks and gluons -- in a state of matter that last existed some 14 billion years ago. RHIC's current collision rate -- its luminosity -- is thousands of collisions per second. But RHIC physicists want more because the more collisions, the more data they can take and the more analysis they can do toward understanding the forces causing these subatomic particles to interact and coalesce to form the universe as it is today. One approach to achieving higher collision rates is called stochastic cooling, which is an accelerator beam-feedback technique to keep an accelerator's particle beam size as small as possible. Although this approach has been used in specialized, low-energy accelerators, it has never been made to work at high energy of with tightly bunched beams such as RHIC's -- until now. After defining stochastic cooling concepts and techniques, the lecturer will describe how the stochastic cooling system that began operating at RHIC last year has significantly reduced the energy spread of beams. And he will talk about plans to build upon this success by installing another system by next fall.
Download or read book Workshop on Beam Cooling and Related Topics written by Jacques Bosser and published by . This book was released on 1994 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ion Beam Cooling Toward The Crystalline Beam Proceedings Of The Workshop written by Akira Noda and published by World Scientific. This book was released on 2002-12-20 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with recent topics in the field of ion beam cooling. Indications of one-dimensional ordering observed by electron beam cooling of highly charged heavy ion beams, and crystal beams observed by laser cooling at the RFQ storage ring, are presented together with theoretical and computational investigations on these phenomena. The approach to hot ion beam cooling is also discussed, from the viewpoint of application of the beam cooling technique.
Download or read book Stochastic Cooling of Bunched Beams from Fluctuation and Kinetic Theory written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical formalism for stochastic phase-space cooling of bunched beams in storage rings is developed on the dual basis of classical fluctuation theory and kinetic theory of many-body systems in phase-space. The physics is that of a collection of three-dimensional oscillators coupled via retarded nonconservative interactions determined by an electronic feedback loop. At the heart of the formulation is the existence of several disparate time-scales characterizing the cooling process. Both theoretical approaches describe the cooling process in the form of a Fokker-Planck transport equation in phase-space valid up to second order in the strength and first order in the auto-correlation of the cooling signal. With neglect of the collective correlations induced by the feedback loop, identical expressions are obtained in both cases for the coherent damping and Schottky noise diffusion coefficients. These are expressed in terms of Fourier coefficients in a harmonic decomposition in angle of the generalized nonconservative cooling force written in canonical action-angle variables of the particles in six-dimensional phase-space. Comparison of analytic results to a numerical simulation study with 90 pseudo-particles in a model cooling system is presented.
