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MOXAA01 |
Challenges for Highest Energy Circular Colliders |
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- F. Zimmermann, M. Benedikt, D. Schulte, J. Wenninger
CERN, Geneva, Switzerland
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A new tunnel of 80-100 km circumference could host a 100 TeV centre-of-mass energy-frontier proton collider (FCC-hh/VHE-LHC), with a circular lepton collider (FCC-ee/TLEP) as potential intermediate step, and a lepton-hadron collider (FCC-he) as additional option. FCC-ee, operating at four different energies for precision physics of the Z, W, and Higgs boson and the top quark, represents a significant push in terms of technology and design parameters. Pertinent R&D efforts include the RF system, top-up injection scheme, optics design for arcs and final focus, effects of beamstrahlung, beam polarization, energy calibration, and power consumption. FCC-hh faces other challenges, such as high-field magnet design, machine protection and effective handling of large synchrotron radiation power in a superconducting machine. All these issues are being addressed by a global FCC collaboration. A parallel design study in China prepares for a similar, but smaller collider, called CepC/SppC.
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Slides MOXAA01 [27.493 MB]
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-MOXAA01
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MOPRO029 |
Feed Forward Orbit Correction in the CLIC Ring to Main LINAC Transfer Lines |
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- R. Apsimon, A. Latina, D. Schulte, J.A. Uythoven
CERN, Geneva, Switzerland
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The emittance growth in the betatron collimation system of the 27 km long transfer lines between the CLIC damping rings and the main LINAC depends strongly on the transverse orbit jitter. The resulting stability requirements of the damping ring extraction elements seem extremely difficult to achieve. Position and angle feed forward systems in these long transfer lines bring the specified parameters of the extraction elements within reach. The designs of the optics and feed forward hardware are presented together with tracking simulations of the systems.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO029
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MOPME049 |
Design Considerations of the Final Turnaround Regions for the CLIC Drive Beam |
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- R. Apsimon, J. Esberg, A. Latina, D. Schulte, J.A. Uythoven
CERN, Geneva, Switzerland
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The optics design of the final turnaround regions for the CLIC drive beam is presented. This includes the extraction region, the turnaround loop and the phase feed forward chicane for correcting errors on the bunch phase. The design specifications of the kicker and septum magnets are provided. Tracking simulations and detailed studies of coherent and incoherent synchrotron radiation have been used to optimise the optics in the turnaround region in order to minimise transverse and longitudinal emittance growth.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2014-MOPME049
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TUPRO019 |
Localisation of Beam Offset Jitter Sources at ATF2 |
1049 |
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- J. Pfingstner, H. Garcia, A. Latina, M. Patecki, D. Schulte, R. Tomás
CERN, Geneva, Switzerland
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For the commissioning and operation of modern particle accelerators, automated error detection and diagnostics methods are becoming increasingly important. In this paper, we present two such methods, which are capable of localising sources of beam offset jitter with a combination of correlation studies and so called degree of freedom plots. The methods were applied to the ATF2 beam line at KEK, where one of the major goals is the reduction of the beam offset jitter. Results of this localisation are shown in this paper. A big advantage of the presented method is its high robustness especially to varying optics parameters. Therefore, we believe that the developed beam offset jitter localisation methods can be easily applied to other accelerators.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO019
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TUPRO064 |
Scaling Laws of Wake Field Effects for Gradient Changes in the CLIC Main Linac |
1183 |
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- J. Pfingstner, A. Latina, D. Schulte
CERN, Geneva, Switzerland
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The main linac of CLIC is designed to maximize the transportable bunch charge, since this parameter determines the energy efficiency of the CLIC accelerating structures. The bunch charge is limited by short-range wake field effects, which increase the projected beam emittance. For the main linac cost optimisation, it is important to understand how the charge limit scales with the change of the gradient of the accelerating structures. In this paper, we determine such a scaling law via simulations studies. It is shown that from different possible scenarios, the charge limit for a lower gradient CLIC structure scales advantageous and a relatively high charge can be used.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO064
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TUPRO065 |
Tests of Beam-based Alignment at FACET |
1186 |
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- A. Latina, J. Pfingstner, D. Schulte
CERN, Geneva, Switzerland
- E. Adli
University of Oslo, Oslo, Norway
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Tests of Beam-Based Alignment have been performed at FACET, with successful results. A flight simulator based on PLACET has been put in place to test the correction algorithms before applying the correction to the real machine. The flight simulator not only helped studying the parameters space in a safe environment, but it also helped developing a graphical interface that the experimenter can use to set each parameter of the correction also during the on-line.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO065
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TUPME003 |
Effect of CSR Shielding in the Compact Linear Collider |
1337 |
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- J. Esberg, R. Apsimon, A. Latina, D. Schulte
CERN, Geneva, Switzerland
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The Drive Beam complex of the Compact LInear Collider must use short bunches with a large charge making beam transport susceptible to unwanted effects of Coherent Synchrotron Radiation emitted in the dipole magnets. We here present the effects of transporting the beam within a limited aperture which decreases the magnitude of the CSR wake. The effect, known as CSR shielding, eases the design of key components of the facility.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME003
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TUPME004 |
Lowering the CLIC IP Horizontal Beta Function |
1340 |
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- H. Garcia, D. Schulte, R. Tomás
CERN, Geneva, Switzerland
- H. Garcia
UPC, Barcelona, Spain
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In order to alleviate the beamstrahlung photon emission, the beams at the CLIC Interaction Point must be flat. We propose to explore this limit reducing the horizontal beta function for CLIC at 500 GeV c.o.m. energy to half of its nominal value. This could increase the photon emission but it also increases luminosity and might allow reducing the bunch charge keeping the same luminosity. This configuration can also be considered for lower energies where beamstrahlung is less critical.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME004
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TUPME008 |
Status of the CLIC-UK R&D Programme on Design of Key Systems for the Compact Linear Collider |
1354 |
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- P. Burrows, R. Ainsworth, T. Aumeyr, D.R. Bett, N. Blaskovic Kraljevic, L.M. Bobb, S.T. Boogert, A. Bosco, G.B. Christian, L. Corner, F.J. Cullinan, M.R. Davis, D. Gamba, P. Karataev, K.O. Kruchinin, A. Lyapin, L.J. Nevay, C. Perry, J. Roberts, J. Snuverink, J.R. Towler
JAI, Egham, Surrey, United Kingdom
- R. Ainsworth, T. Aumeyr, S.T. Boogert, A. Bosco, P. Karataev, K.O. Kruchinin, L.J. Nevay, J.R. Towler
Royal Holloway, University of London, Surrey, United Kingdom
- P.K. Ambattu, G. Burt, A.C. Dexter, M. Jenkins, S. Karimian, C. Lingwood, B.J. Woolley
Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
- L.M. Bobb, R. Corsini, D. Gamba, A. Grudiev, A. Latina, T. Lefèvre, C. Marrelli, M. Modena, J. Roberts, H. Schmickler, D. Schulte, P.K. Skowroński, J. Snuverink, S. Stapnes, F. Tecker, R. Tomás, R. Wegner, M. Wendt, W. Wuensch
CERN, Geneva, Switzerland
- J.A. Clarke, S.P. Jamison, P.A. McIntosh, B.J.A. Shepherd
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
- N.A. Collomb, D.G. Stokes
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
- L. Corner
Oxford University, Physics Department, Oxford, Oxon, United Kingdom
- W.A. Gillespie, R. Pan, M.A. Tyrk, D.A. Walsh
University of Dundee, Nethergate, Dundee, Scotland, United Kingdom
- R.M. Jones
UMAN, Manchester, United Kingdom
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Six UK institutes are engaged in a collaborative R&D programme with CERN aimed at demonstrating key aspects of technology feasibility for the Compact Linear Collider (CLIC). We give an overview and status of the R&D being done on: 1) Drive-beam components: quadrupole magnets and the beam phase feed-forward prototype. 2) Beam instrumentation: stripline and cavity beam position monitors, an electro-optical longitudinal bunch profile monitor, and laserwire and diffraction and transition radiation monitors for transverse beam-size determination. 3) Beam delivery system and machine-detector interface design, including beam feedback/control systems and crab cavity design and control. 4) RF structure design. In each case, where applicable, we report on the status of prototype systems and performance tests with beam at the CTF3, ATF2 and CesrTA test facilities, including plans for future experiments.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-TUPME008
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THPRO025 |
Conceptual Design of a X-FEL Facility using CLIC X-band Accelerating Structure |
2914 |
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- A.A. Aksoy, Ö. Yavaş
Ankara University, Accelerator Technologies Institute, Golbasi / Ankara, Turkey
- D. Angal-Kalinin, J.A. Clarke
Cockcroft Institute, Warrington, Cheshire, United Kingdom
- M.J. Boland
SLSA, Clayton, Australia
- G. D'Auria, S. Di Mitri, C. Serpico
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
- M. Doğan
Dogus University, Istanbul, Turkey
- T.J.C. Ekelöf, R.J.M.Y. Ruber, V.G. Ziemann
Uppsala University, Uppsala, Sweden
- W. Fang, Q. Gu
SINAP, Shanghai, People's Republic of China
- A. Latina, D. Schulte, S. Stapnes, I. Syratchev, W. Wuensch
CERN, Geneva, Switzerland
- Z. Nergiz
Nigde University, Nigde University Science & Art Faculty, Nigde, Turkey
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Within last decade a linear accelerating structure with an average loaded gradient of 100 MV/m at 12 GHz has been demonstrated in the CLIC study. Recently, it has been proposed to use the CLIC structure to drive an FEL linac. In contrast to CLIC the linac would be powered by klystrons not by a drive beam. The main advantage of this proposal is achieving the required energies in a very short distance, thus the facility would be rather compact. In this study, we present the conceptual design parameters of a facility which could generate laser photon pulses covering the range of 1-75 Angstrom. Shorter wavelengths could also be reached with slightly increasing the energy.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO025
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THPRO028 |
Bunch Compressor Design for CLIC Drive Beam |
2924 |
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- A.A. Aksoy
Ankara University, Accelerator Technologies Institute, Golbasi / Ankara, Turkey
- J. Esberg, D. Schulte
CERN, Geneva, Switzerland
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The drive-beam linac which is required for generation RF power at Compact Linear Collider (CLIC) has to accelerate an electron beam with 8.4 nC per bunch up to 2.4 GeV in almost fully loaded structures. The required beam stability in both transverse and longitudinal directions are of concern for such a high bunch charge. We present different bunch compressor designs for the Drive Beam and compare their performance including the effects beam energy and phase jitters.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO028
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THPME081 |
Plans for an Australian XFEL Using a CLIC X-band Linac |
3424 |
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- M.J. Boland, T.K. Charles, R.T. Dowd, G. LeBlanc, Y.E. Tan, K.P. Wootton, D. Zhu
SLSA, Clayton, Australia
- R. Corsini, A. Grudiev, A. Latina, D. Schulte, S. Stapnes, I. Syratchev, W. Wuensch
CERN, Geneva, Switzerland
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Preliminary plans are presented for a sub-Angstrom wavelength XFEL at the Australian Synchrotron light source site. The design is based around a 6 GeV x-band linac from the CLIC Project. One of the motivations for the design is to have an XFEL co-located on the site with existing storage ring based synchrotron light source. The desire and ability of the Australian photon science community to win beamtime on existing XFELs has lead to this design study to plan for a future machine in Australia. The technology choice is also driven by the Australian participation in the CLIC Collaboration and the local HEP community.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2014-THPME081
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