Download or read book Tuning of Final Focus System for Future Linear Colliders written by Katsunobu Oide and published by . This book was released on 1991 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Expanded Studies of Linear Collider Final Focus Systems at the Final Focus Test Beam written by and published by . This book was released on 1995 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to meet their luminosity goals, linear colliders operating in the center-of-mass energy range from 3,50 to 1,500 GeV will need to deliver beams which are as small as a few Manometers tall, with x:y aspect ratios as large as 100. The Final Focus Test Beam (FFTB) is a prototype for the final focus demanded by these colliders: its purpose is to provide demagnification equivalent to those in the future linear collider, which corresponds to a focused spot size in the FFTB of 1.7 microns (horizontal) by 60 manometers (vertical). In order to achieve the desired spot sizes, the FFTB beam optics must be tuned to eliminate aberrations and other errors, and to ensure that the optics conform to the desired final conditions and the measured initial conditions of the beam. Using a combination of incoming-beam diagnostics. beam-based local diagnostics, and global tuning algorithms, the FFTB beam size has been reduced to a stable final size of 1.7 microns by 70 manometers. In addition, the chromatic properties of the FFTB have been studied using two techniques and found to be acceptable. Descriptions of the hardware and techniques used in these studies are presented, along with results and suggestions for future research.

Download or read book Final Focus Systems for Linear Colliders written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The final focus system of a linear collider must perform two primary functions, it must focus the two opposing beams so that their transverse dimensions at the interaction point are small enough to yield acceptable luminosity, and it must steer the beams together to maintain collisions. In addition, the final focus system must transport the outgoing beams to a location where they can be recycled or safely dumped. Elementary optical considerations for linear collider final focus systems are discussed, followed by chromatic aberrations. The design of the final focus system of the SLAC Linear Collider (SLC) is described. Tuning and diagnostics and steering to collision are discussed. Most of the examples illustrating the concepts covered are drawn from the SLC, but the principles and conclusions are said to be generally applicable to other linear collider designs as well. 26 refs., 17 figs. (LEW).

Download or read book Optical Tuning in the Arcs and Final Focus Sections of the Stanford Linear Collider written by Philip Sébastien Bambade and published by . This book was released on 1989 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Expanded Studies of Linear Collider Final Focus Systems at the Final Focus Test Beam written by Peter Gregory Tenenbaum and published by . This book was released on 1995 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optical Tuning in the Arcs and Final Focus Section of the Stanford Linear Collider written by Philip Sébastien Bambade and published by . This book was released on 1989 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optical Tuning in the Arcs and Final Focus Sections of the Stanford Linear Collider written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, we present the experimental tuning procedures developed for the Arcs and for the Final Focus Section of the Stanford Linear Collider (SLC). Such tuning is necessary to maximize the luminosity, by minimizing the beam size at the interaction point, and to reduce backgrounds in the experiment. In the final Focus Section, the correction strategy must result from the principles of the optical design, which is based on cancellations between second order aberrations, and on the ability to measure micron-size beams typical of the SLC. In the Arcs, the corrections were designed after the initial commissioning, to make the system more error-tolerant, through a modification in the optical design, and to enable adjustments of the beam phase-space a the injection to the Final Focus System, through a harmonic perturbation technique inspired from circular accelerators. Although the overall optimization of the SLC is not entirely finished, an almost optimal set-up has been achieved for the optics of the Arcs and of the Final Focus Section. Beams with transverse sizes close to the nominal ones, of a few microns, have been obtained at the interaction point. We present and discuss our results and the optical limits to the present performance. 24 refs., 25 figs., 2 tabs.

Download or read book Design and Higher Order Optimisation of Final Focus Systems for Linear Colliders written by Eduardo Marín Lacoma and published by . This book was released on 2013 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: The accelerator and particle physics communities are considering a lepton Linear Collider LC as the most appropriate machine to carry out high precision particle physics research in the TeV energy regime. The Compact Linear Collider CLIC and the International Linear Collider ILC are the two proposals for the future e+e- LC. Both designs achieve a luminosity L above 10̂(34) cm-2 s-1 at the interaction point IP, satisfying the particle physics requirements. The LC consists of different systems, being the Final Focus System FFS the last one before colliding the beam at the IP. It is responsible to focus the beams at sizes in the range of nanometres by means of the Final Doublet FD. The FFS designs of the CLIC and ILC projects are based on a new local chromaticity correction scheme which has never been experimentally tested before. The Accelerator Test Facility ATF2 at KEK (Japan) aims to experimentally verify the feasibility of the FFS based on this novel scheme. The present thesis is devoted to the design and higher order optimisation of FFS for linear colliders based on the local chromaticity correction scheme. The CLIC design luminosity L0 is 5.9·10̂(34) cm-2 s-1 assuming head-on collisions. However the beams cross each other at the IP forming an angle of 20 mrad. Due to this crossing scheme the luminosity would be reduced by 90%. Crab cavities are dedicated to tilt the bunches in order to provide head-on like collisions preserving the design L0. In this thesis different solutions that recover the design luminosity for the CLIC FFS are proposed. The designs of a new ATF2 Nominal and Ultra-low beta* lattices, to test the feasibility of the ILC and CLIC FFS respectively, are presented in this thesis. The expected IP vertical beam sizes sy* for these lattices are 38 and 23 nm respectively, at this beam size regime the magnetic field quality of the FFS magnets is a concern. Indeed, the evaluated sy* with the measured multipole components is 100% for the Nominal lattice and 400% for the Ultra-low beta* lattice. The study of the higher order aberrations performed in this thesis is crucial for identifying possible cures that minimise the observed beam size growth. Different solutions have been studied: (i) replacing the FD by better field quality magnets, (ii) swapping the ATF2 quadrupole magnets according to their skew sextupole component and (iii) modifying the lattice optics. The new lattice designs ATF2 Bx2.5By1.0 and ATF2 Ultra-low betay* are based on the prosposed solutions. The impact of the multipoles components is effectively minimsed for both new designs, achieving a sy* equal to 38 and 27 nm ,respectively. The tuning study of the FFS determines its feasibility under realistic error conditions. 100 machines with different initial error configurations are used to address this problem. The tuning simulation study for the alternative CLIC FFS design takes into account BPM resolution, the effect of synchrotron radiation and the misalignment errors of the magnets, being the later a critical parameter on the tuning performance of the system. The motion of the magnetic centre when shunting the quadrupole magnet might represent a limiting factor for further improvement of its alignment. Dedicated measurements at ATF2 have shown a motion of the magnetic centre below 1 micrometre for a shunting variation of 20%. Under this alignment condition the tuning study of the CLIC FFS shows that 80% of the machines reach a L equal or above than L0. The errors included in the tuning study of the ATF2 lattices are misalignments, tilts and miss-powering of the ATF2 FFS magnets. The simulated tuning results show that 80% of the machines reach a final sy* that does not exceed in more than 11% and 35% the design sy* for the ATF2 Bx2.5By1.0 and Ultra-low beta_y* lattices respectively. These results demonstrate the theoretical feasebility of FFS based on the novel chromaticity correction scheme.

Download or read book Next Generation Linear Collider Final Focus System Stability Tolerances written by and published by . This book was released on 2007 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design of final focus systems for the next generation of linear colliders has evolved largely from the experience gained with the design and operation of the Stanford Linear Collider (SLC) and with the design of the Final Focus Test Beam (FFTB). We will compare the tolerances for two typical designs for a next-generation linear collider final focus system. The chromaticity generated by strong focusing systems, like the final quadrupole doublet before the interaction point of a linear collider, can be canceled by the introduction of sextupoles in a dispersive region. These sextupoles must be inserted in pairs separated by a -I transformation (Chromatic Correction Section) in order to cancel the strong geometric aberrations generated by sextupoles. Designs proposed for both the JLC or NLC final focus systems have two separate chromatic correction sections, one for each transverse plane separated by a ''[beta]-exchanger'' to manipulate the [beta]-function between the two CCS. The introduction of sextupoles and bending magnets gives rise to higher order aberrations (long sextupole and chrome-geometries) and radiation induced aberrations (chromaticity unbalance and ''Oide effect'') and one must optimize the lattice accordingly.

Download or read book This Indenture of Three Parts Made the Twentieth Day of July in the Twenty Ninth Year of the Reign of Our Sovereign Lord George the Third in the Year of Our Lord One Thousand Seven Hundred and Eighty Nine Between Joseph Sladen of the Town of Ffolkstour in the County of Kent Gentleman of the First Part John Jones of Stanford only Son and Heir and Also Devisee of John Jones Late of Stanford of the Second Part and Isaac Tournay of the Town and Port of Hythe in the Said County of Kent Gentleman a Trustee Appointed by and for and on the Behalf of the Said John Jones of the Third Part written by and published by . This book was released on 1789 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Conceptual Design of Final Focus Systems for Linear Colliders written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Linear colliders are a relatively recent development in the evolution of particle accelerators. This report discusses some of the approaches that have been considered for the design of Final Focus Systems to demagnify the beam exiting from a linac to the small size suitable for collisions at the interaction point. The system receiving the most attention is the one adopted for the SLAC Linear Collider. However, the theory and optical techniques discussed should be applicable to the design efforts for future machines.

Download or read book A Cytological Study of Artificial Parthenogenesis in Cumingia written by Margaret Morris and published by . This book was released on 1917 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Implementation and Validation of the Linear Collider Final Focus Prototype written by Yves Renier and published by . This book was released on 2010 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: A future e+ /e- Linear Collider (LC) would be precise and complement3lY to the LHC. One of the challenges of this LC will be to focus the beam down to nm level transverse sizes at the interaction point, to obtain a high luminosity. The two LC projects (lLC and CLlC) require beam delivery systems with the same local chromaticity correction scheme in the final focus (FF). ATF2 at KEK (Japan) implements this scheme scaled down in energy, uses the beam extracted from the ATF damping ring. The ATF2 goals are to prove the feasibility and the stability of the LC FF system and to define and test the experimental correction procedures. The work in this thesis was st3lied before the commissioning and covered its first year at KEK. At the beginning, we observed that the striplines BPMs were not working properly. The problem was characterized and later solved in 20] 0 by upgrading the electronics. We then developed an efficient procedure to check the modelling of the beam line. Then, we were able to successfully test the trajectory correction algorithm which had been developed. We also successfully developed an algorithm to reconstruct pulse to pulse beam trajectory fluctuations with sub-flm precision. This reconstruction also gave a precise determination of the energy fluctuation, allowing a global fit of the dispersion function along the beam line with a precision of a few mm. A simple and robust IP beam size tuning method using sextupoles displacements was also studied in simulation.

Download or read book A RECIPE FOR LINEAR COLLIDER FINAL FOCUS SYSTEM DESIGN written by and published by . This book was released on 2003 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design of Final Focus systems for linear colliders is challenging because of the large demagnifications needed to produce nanometer-sized beams at the interaction point. Simple first- and second-order matrix matching have proven insufficient for this task, and minimization of third- and higher-order aberrations is essential. An appropriate strategy is required for the latter to be successful. A recipe for Final Focus design, and a set of computational tools used to implement this approach, are described herein. An example of the use of this procedure is given.

Download or read book Comparative Study of Final Focus Systems for CLIC and Other Luminosity Enhancement Studies for Future Linear Colliders written by Héctor García Morales and published by . This book was released on 2015 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Beam based Alignment and Tuning Procedures for E Sup E Sup Minus Collider Final Focus Systems written by and published by . This book was released on 1991 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: For future linear colliders, with very small emittances and beam sizes and demanding tolerances on final focus system alignment and magnet errors, it becomes increasingly important to use the beam as a diagnostic tool. We report here procedures we have identified and will be implemented in the Final Focus Test Beam at SLAC incorporating (1) quadrupole strength changes, (2) central orbit modifications, (3) spot size measurements, and (4) beam stability monitoring. 3 refs., 4 figs., 3 tabs.

Download or read book Proceedings of the Second Workshop on Japan Linear Collider JLC KEK November 6 8 1990 written by Setsuya Kawabara and published by . This book was released on 1991 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: