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Introduction to CLIC accelerator development: high-power and high-gradient at X-band

Introduction to CLIC accelerator development: high-power and high-gradient at X-band. What is CLIC?. A highly developed concept, design and hardware study for a collider capable of delivering e + e - physics in the energy decade of 0.3 to 3 TeV – the lepton physics compliment to the LHC.

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Introduction to CLIC accelerator development: high-power and high-gradient at X-band

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  1. Introduction to CLIC accelerator development: high-power and high-gradient at X-band

  2. What is CLIC? A highly developed concept, design and hardware study for a collider capable of delivering e+e- physics in the energy decade of 0.3 to 3 TeV– the lepton physics compliment to the LHC. 500 GeVc.m. 1.5 TeVc.m. 3TeV c.m. CLIC multi-lateral collaboration - 44 Institutes from 22 countries

  3. Primary accelerator features Reach the high end of the energy range through high, 100 MV/m, accelerating gradient by using short-pulse, around 200 ns, normal-conducting rf. Deal with the resulting high peak power requirement by going to high rf frequency, X-band, produced by the so-called drive beam scheme. At the lowest energies it is also possible to use klystron/rf pulse compressor units. Accelerating structure input powers are around 60 MW. Deal with the luminosity and resulting high average power requirement by producing, transporting and colliding low-emittance, multi-bunch beams. This requires high-performance damping rings, micron-level main-linac precision and alignment, accelerating structure higher-order-mode damping, nanometer-level main-linac quadrupole stabilization and a sub-nm stabilized final focus etc.

  4. The physics and accelerator studies of CLIC have been documented in a CDR which was released last year: In addition a shorter overview document was submitted as input to the European Strategy update, available at: http://arxiv.org/pdf/1208.1402v1

  5. The focus of this talk I will now to run through the high-power, high-gradient, high-frequency, high-precision technology we have developed for the CLIC study (and up until some years ago by the NLC/JLC studies) - and introduce - our relation with industry - and - our efforts to help apply this technology to other projects - and - our efforts to provide formal collaborative structures and funding to promote our technology. Projects CLIC Industry

  6. Accelerating gradients achieved in tests. Status: 4-9-2012 HOM damped

  7. How we got there: High-power design laws The functions which, along with surface electric and magnetic field (pulsed surface heating), give the high-gradient performance of the structures are: Es/Ea global power flow local complex power flow New local field quantity describing the high gradient limit of accelerating structures. A. Grudiev, S. Calatroni, W. Wuensch (CERN). 2009. 9 pp. Published in Phys.Rev.ST Accel.Beams 12 (2009) 102001 Hs/Ea Sc/Ea2

  8. How we got there: heat treatment and material structure TD18#3 at SLAC TD18#2 at KEK Attempting to understand why it works. Stacking disks Temperature treatment for high-gradient developed by NLC/JLC

  9. Micron precision turning and milling • Accelerating structure tolerances drive transverse wakefields and off-axis rf induced kicks which in turn leads to emittance growth – micron tolerances required. • Multi-bunch trains require higher-order-mode wakefield suppression – cells require milled features. • High-speed diamond machining also seems to be beneficial for high-gradient performance through minimizing induced surface stresses. Development done “in industry”

  10. Power production using PETS and two-beam acceleration CLIC Nominal, unloaded Drive beam ON CLIC Nominal, loaded Drive beam OFF

  11. High-gradient testing using klystrons • In order to test enough accelerating structures we have an on-going campaign to establish a number of klystron-based test stands. • We have received an XL-5 klystron from SLAC from a batch order from SLAC and have an order out with CPI for two more. • A side benefit is that these test stands, with accelerating structures, turn out to be very close to the rf units one could use for: • an entry energy CLIC • a normal conducting FEL linac • a Compton-source linac • a medical linac • We wish to advance mutually beneficial work with these types of projects, and we hope today helps.

  12. Klystron-based test stands for CLIC NEXTEF at KEK XBox1 at CERN ASTA at SLAC? XBox2 at CERN

  13. Two paths for test stands and linac power units 50-75 MW tubes NEXTEF, Xboxes 1 and 2 Potentially 100 Hz range linacs in the 8-9 GeV range. 7-10 MW tubes combined Xbox3 Potentially kHz range linacs in the 1-2 GeV range. Industrial supply is crucial!

  14. Forming a community HG2013 International Workshop on Breakdown Science and High Gradient Technology HG2012 at KEK ICTP, Adriatico Guesthouse, Kastler Lecture Hall Trieste, Italy 3-6 June 2013 https://indico.cern.ch/conferenceDisplay.py?ovw=True&confId=208932 Now in our seventh year. Focus steadily expanding to include broad high-gradient normal-conducting rf community. http://indico.cern.ch/conferenceDisplay.py?confId=231116

  15. Last slide …with CLIC technology! Your project…

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