Author: Schulte, D.
Paper Title Page
MOPOW036 Design Optimization of an X-band based FEL 793
 
  • A.A. Aksoy
    Ankara University, Accelerator Technologies Institute, Golbasi / Ankara, Turkey
  • A. Latina, J. Pfingstner, D. Schulte
    CERN, Geneva, Switzerland
  • Z. Nergiz
    Nigde University, Nigde, Turkey
 
  A design effort for a new generation of compact, cost-effective, power-efficient FEL facilities, based on X-band technology, has been launched. High-frequency X-band acceleration implies strong wakefields, tight alignment and mechanical tolerances, and challenging stability issues. In this paper a design is proposed for the injector and the linacs, including the two bunch compressors. RF gun and injector simulations have been performed, successfully meeting the stringent requirements in terms of minimum projected emittance, sliced emittance and minimum bunch length. In the design of the linac and bunch compressors wakefield effects and misalignment have been taken into account. Start-to-end tracking simulations through the optimized lattice are presented and discussed.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW036  
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TUPMR047 Conceptual Design Considerations for the 50 TeV FCC Beam Dump Insertion 1356
 
  • F. Burkart, M.G. Atanasov, W. Bartmann, B. Goddard, T. Kramer, A. Lechner, A. Sanz Ull, D. Schulte, L.S. Stoel
    CERN, Geneva, Switzerland
  • D. Barna
    University of Tokyo, Tokyo, Japan
 
  Safely extracting and absorbing the 50 TeV proton beams of the FCC-hh collider will be a major challenge. Two extended straight sections (ESS) are dedicated to beam dumping system and collimation. The beam dumping system will fast-extract the beam and transport it to an external absorber, while the collimation system will protect the superconducting accelerator components installed further downstream. The high stored beam energy of about 8.5 GJ per beam means that machine protection considerations will severely constrain the functional design of the ESS and the beam dump line geometry, in addition to dominating the performance specifications of the main sub-systems like kickers and absorber blocks. The general features, including concept choice, optics in the ESS and beam dump line, passive protection devices, layout and integration are described and discussed.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR047  
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TUPMW008 Evolution of the Beam Parameters during Luminosity Production in the Future Circular Hadron Collider 1426
 
  • X. Buffat, D. Schulte
    CERN, Geneva, Switzerland
 
  The evolution of the beam parameters during luminosity production in the Future Circular Hadron Collider (FCC-hh) is described based on basic models of the effect of synchrotron radiations, intra-beam scattering, luminosity burn-off and beam-beam limitations, allowing for an estimation of the luminosity performance in different running scenarios. It is shown that a large variations of the beam parameters is expected during a cycle. Potential operational schemes adapting to these variations are considered.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW008  
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TUPMW019 First Evaluation of Dynamic Aperture at Injection for FCC-hh 1466
 
  • B. Dalena, D. Boutin, A. Chancé, J. Payet
    CEA/IRFU, Gif-sur-Yvette, France
  • B.J. Holzer, R. Martin, D. Schulte
    CERN, Geneva, Switzerland
 
  Funding: This Research and Innovation Action project submitted to call H2020-INFRADEV-1-2014-1 receives funding from the European Union's H2020 Framework Programme under grant agreement no. 654305.
In the hadron machine option, proposed in the context of the Future Circular Colliders (FCC) study, the dipole field quality is expected to play an important role, as in the LHC. A preliminary evaluation of the field quality of dipoles, based on the Nb3Sn technology, has been provided by the magnet group. The effect of these field imperfections on the dynamic aperture, using the present lattice design, is presented and first tolerances on the main multipole components are evaluated.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW019  
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TUPMW020 Status of the Beam Optics of the Future Hadron-Hadron Collider FCC-hh 1470
 
  • A. Chancé
    CEA/DSM/IRFU, France
  • D. Boutin, B. Dalena, J. Payet
    CEA/IRFU, Gif-sur-Yvette, France
  • B.J. Holzer, R. Martin, D. Schulte
    CERN, Geneva, Switzerland
 
  Funding: This work was supported by the HORIZON 2020 project EuroCirCol, grant agreement 654305.
Following the recommendations of the European Strategy Group for High Energy Physics, CERN launched a design study for possible future circular collider projects, FCC, to investigate their feasibility for high energy physics research. The study covers three options, a proton-proton collider, a circular e+/e collider and a scenario for e-p collisions to study deep inelastic scattering. The present paper describes the beam optics and the lattice design of the Future Hadron-Hadron Collider (FCC-hh). The status of the first order and second order optics of the ring will be shown for collisions at the required centre-of-mass energy of 100 TeV cm.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW020  
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TUPMW037 Luminosity Targets for FCC-hh 1523
 
  • F. Zimmermann, M. Benedikt, X. Buffat, D. Schulte
    CERN, Geneva, Switzerland
 
  Funding: Supported by the European Commission under the Capacities 7th Framework Programme project EuCARD-2, grant agreement 312453, and under the HORIZON 2020 project EuroCirCol, grant agreement 654305.
We discuss the choice of target values for the peak and integrated luminosity of a future high-energy frontier circular hadron collider (FCC-hh). We review the arguments on the physics reach of a hadron collider. Next we show that accelerator constraints will limit the beam current and the turnaround time. Taking these limits into account, we derive an expression for the ultimate integrated luminosity per year, depending on a possible pile-up limit imposed by the physics experiments. We finally benchmark our result against the planned two phases of FCC-hh.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW037  
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WEPMY009 Transverse Tolerances of a Multi-Stage Plasma Wakefield Accelerator 2561
SUPSS034   use link to see paper's listing under its alternate paper code  
 
  • C.A. Lindstrøm, E. Adli, J. Pfingstner
    University of Oslo, Oslo, Norway
  • E. Marín, D. Schulte
    CERN, Geneva, Switzerland
 
  Funding: This work is supported by the Research Council of Norway.
Plasma wakefield acceleration (PWFA) provides GeV/m-scale accelerating fields, ideal for applications such as a future linear collider. However, strong focusing fields imply that a transversely offset beam with an energy spread will experience emittance growth from the energy dependent betatron oscillation. We develop an analytic model for estimating tolerances from this effect, as well as an effective simplified simulation tool in Elegant. Estimations for a proposed 1 TeV PWFA linear collider scheme indicate tight tolerances of order 40 nm and 1 μrad in position and angle respectively.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY009  
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WEPMY010 Considerations for a Drive Beam Scheme for a Plasma Wakefield Linear Collider 2565
 
  • J. Pfingstner, E. Adli, C.A. Lindstrøm
    University of Oslo, Oslo, Norway
  • E. Marín, D. Schulte
    CERN, Geneva, Switzerland
 
  The potential for high average gradients makes plasma wakefield acceleration (PWFA) an attracting option for future linear colliders. For a beam-driven PWFA collider a sequence of cells has to be supplied with synchronised drive beam bunches. This paper is concerned with the generation, transport and distribution of these drive beam bunches in a so-called drive beam complex for a 3 TeV collider. Based on earlier concepts, several modifications are suggested. The new design includes a superconducting linac and an optimised bunch delay system with a tree structure. To verify the feasibility for the overall complex, a lattice design and tracking studies for the critical bending arc subsystem are presented. Also the feasibility of a compact bunch separation system is shown. The result of these efforts is a drive beam complex that is optimised for construction cost and power efficiency that favours unified lattice solutions.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY010  
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WEPOR005 Ground Motion Compensation using Feed-forward Control at ATF2 2670
 
  • D.R. Bett, C. Charrondière, M. Patecki, J. Pfingstner, D. Schulte, R. Tomás
    CERN, Geneva, Switzerland
  • A. Jeremie
    IN2P3-LAPP, Annecy-le-Vieux, France
  • K. Kubo, S. Kuroda, T. Naito, T. Okugi, T. Tauchi, N. Terunuma
    KEK, Ibaraki, Japan
 
  Ground motion compensation using feed-forward control is a novel technique being developed to combat beam imperfections resulting from the vibration-induced misalignment of beamline components. The method is being evaluated experimentally at the KEK Accelerator Test Facility 2 (ATF2). It has already been demonstrated that the beam position correlates with the readings from a set of seismometers located along the beamline. To compensate for this contribution to the beam jitter, the fully operational system will use realtime measurement and processing in order to calculate and apply the feed-forward correction on a useful time scale. The progress towards a working system is presented in this paper.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR005  
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THPMB042 Residual Orbit Correction Studies for the FCC-hh 3332
 
  • D. Boutin, B. Dalena
    CEA/IRFU, Gif-sur-Yvette, France
  • A. Chancé, J. Payet
    CEA/DSM/IRFU, France
  • B.J. Holzer, R. Martin, D. Schulte
    CERN, Geneva, Switzerland
 
  The FCC-hh (Future Hadron-Hadron Circular Collider) is one of the three options considered for the next genera-tion accelerator in high-energy physics as recommended by the European Strategy Group [*]. Preliminary studies have started to estimate the design parameters of FCC-hh. One of these studies is the calculation of the residual orbit in the arcs of the collider. This is very important for the evaluation of the alignment tolerances of the quadru-poles used in the arcs, the dimensioning of the correctors and of the beam screen. Moreover it has an impact on the dynamic aperture of the ring and the field tolerances of the arc multipoles. To perform the simulations, the beam transport code MADX has been used. Systematic studies of the residual orbit and of the correctors' strength de-pendence on the magnets misalignment or field errors are presented and discussed.
[*] A. Ball et al., EDMS-0134202.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB042  
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THPMR045 CLIC Beam Delivery System Rebaselining and Long L* Lattice Optimization 3500
 
  • F. Plassard, D. Schulte, R. Tomás
    CERN, Geneva, Switzerland
  • P. Bambade
    LAL, Orsay, France
 
  This paper summarizes the re-optimization study made on the CLIC Beam Delivery System (BDS) in the framework of the rebaselining for beam collisions at 380 GeV for the initial energy stage. It describes the optimization process applied for the beam parameters as well as for the Final Focus system (FFS) lattice design with respect to the energy upgrade transition to 3 TeV. Both initial and final energy stages were optimized for a short (nominal) and a long L* (6 meters). The long L* option allows the last quadrupole (QD0) to be be located outward of the detector solenoid field influence. FFS optics designs based on the Local chromaticity correction and performance comparisons for both L* options are shown.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR045  
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THPMR046 Advanced BBA Techniques for the Final Focuses of Future Linear Colliders 3504
 
  • J. Snuverink, A. Latina, D. Schulte, R. Tomás
    CERN, Geneva, Switzerland
  • R.M. Bodenstein
    JAI, Oxford, United Kingdom
 
  Tuning the Final-Focus System of future linear colliders is one of the open challenges the linear collider community is undertaking. Future colliders like ILC and CLIC will feature complex lattice design to focus the beams to nanometer level at the Interaction Point. Standard Beam-Based Alignment (BBA) techniques have proven to hardly meet the requirements in terms of acceptable emittance growth, in both machines. A set of new techniques, respectively called: nonlinear Dispersion-Free Steering (DFS), DFS-knobs scan, and hybrid DFS-knobs with beamsize measurements, have been put in place to cope with the challenge. This paper will reveal the key ideas behind the new techniques, and compare their effectiveness w.r.t. the conventional BBA tuning procedures.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR046  
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THPOR029 First Start-to-End BBA Results in the CLIC RTML 3841
 
  • Y. Han, L. Ma
    SDU, Shandong, People's Republic of China
  • A. Latina, D. Schulte
    CERN, Geneva, Switzerland
 
  CLIC is a design study for a 3 TeV linear collider designed for the high-energy frontier in the post-LHC era. The Ring To Main Linac (RTML) part of CLIC is a long section that must transport the electron and the positron bunches through more than 20 km of beamlines, with minimal emittance growth. A sequence of three beam-based alignment (BBA) techniques must be used to transport the beam: one-to-one correction (OTO), dispersion-free steering (DFS), and sextupole correction (SCS). The performance of the whole correction procedure is tested under several realistic imperfections: magnets position offsets, magnets rotation errors, magnets strength errors and emittance measurement errors. The results show that the emittance growth budgets can be met both in the horizontal and vertical planes.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR029  
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