Author: Publisher:
ISBN: 9789155471309
Category :
Languages : en
Pages : 63
Book Description
Emittance Preservation and Luminosity Tuning in Future Linear Colliders
Author: Low Emittance Tuning Studies for Future Linear Colliders
Author: Kosmas Grigoriou PanagiotidisPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Emittance Preservation in Linear Colliders
Author: Kō-enerugī Butsurigaku Kenkyūjo (Japan)Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Low-emittance Tuning at CesrTA
Author: James Patrick ShanksPublisher:
ISBN:
Category :
Languages : en
Pages : 366
Book Description
The International Linear Collider (ILC) is a proposed 500GeV center-of-mass electron/positron collider. In order to meet luminosity requirements, low-emittance beams must be provided at the start of the two 15-km main linacs. These low-emittance beams will be provided by damping rings, whose optics must be well-corrected in order to minimize dilution of the vertical emittance. In 2008 the Cornell Electron/Positron Storage Ring (CESR) was reconfigured from an electron/positron collider to the CESR Test Accelerator (CesrTA), to serve as a testbed for the ILC damping rings. One of the primary research objectives of the CesrTA project is to explore beam-based optics correction techniques for application at the ILC damping rings. The geometric emittance target for CesrTA is
Start to End Simulations of Low Emittance Tuning and Stabilization
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 6
Book Description
The principal beam dynamics challenge to the subsystems between the damping ring and the collision point of future linear colliders is expected to be the tuning and stabilization required to preserve the transverse emittance and to collide nanometer-scale beams. Recent efforts have focused on realistically modeling the operation and tuning of this region, dubbed the Low Emittance Transport (LET). We report on the development of simulation codes which permit integrated simulation of this complex region, and on early results of these simulations. Future directions of LET simulation are also revealed.
The Preservation of Emittance and Polarization in the International Linear Collider
Author: Jeffrey Claiborne SmithPublisher:
ISBN: 9781109984934
Category :
Languages : en
Pages : 550
Book Description
High luminosity in the International Linear Collider (ILC) requires a very small vertical normalized emittance of 40 nm. The emittance on Damping Ring extraction is 20 nm giving an emittance budget of 20 nm for all components between the Damping Ring (DR) and the Interaction Point (IP). This tight budget requires sophisticated emittance preservation schemes to mitigate growth due to dispersive and chromatic effects, wakefields, coupling and stray fields. The principle sources of emittance growth are first introduced and then the Beam-Based Alignment techniques used in the ILC to mitigate emittance growth are investigated.
Design and Higher Order Optimisation of Final Focus Systems for Linear Colliders
Author: Eduardo Marín LacomaPublisher:
ISBN:
Category :
Languages : en
Pages : 130
Book Description
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.
International Linear Collider Technical Review Committee Second Report 2003
Author: International Linear Collider Technical Review CommitteePublisher:
ISBN:
Category : Linear colliders
Languages : en
Pages : 534
Book Description
Energy Research Abstracts
Author: Proceedings of the XVIII International Linear Accelerator Conference
Author: C. HillPublisher:
ISBN:
Category : Linear accelerators
Languages : en
Pages : 518
Book Description