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Dog-leg Status I. Syratchev for the CLIC team 29.01.2014

Dog-leg Status I. Syratchev for the CLIC team 29.01.2014. Introduction. U nloaded. CLIC nominal. Increasing current. Loaded (CLIC). Gradient along the structure. Unloaded.

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Dog-leg Status I. Syratchev for the CLIC team 29.01.2014

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  1. Dog-leg Status I. Syratchev for the CLIC team 29.01.2014

  2. Introduction Unloaded CLIC nominal Increasing current Loaded (CLIC) Gradient along the structure Unloaded Testing of accelerating structure with nominal beam loading is a missing block in our testing program. Such a test will be done using CTF3 (1.2 A) drive beam and RF power delivered from X-box1 (90 MW) via modified 30 GHz low loss transfer line (60MW). The main target of this experiment is to compare loaded and unloaded accelerating structure breakdown trip rate.

  3. Accelerating gradients achieved in tests. Status: 4-9-2012 loaded

  4. Location of the Dog-leg experiment structure Beam dog-leg Former 30 GHz RF transfer line X-box1

  5. Structure under test: CERN’s T24 (12WNDSvg1.8 KEK N1) No damping

  6. Dog-leg experiment phase #1 (beam only) Drive beam, 1-3A, 100-50 MeV • Main objective of this phase: • To establish routine beam transportation through the structure without losses. • To integrate RF signal acquisition and the beam control systems.

  7. Dog-leg experiment phase #1. T24 is installed in dog-leg… IN OUT Beam direction

  8. Dog-leg experiment phase #1 results. May 2013 Dec. 2013 The measurement fully supported expected performance!

  9. Complete Dog-leg test RF network layout (expectedRF transfer efficiency ~0.75) Mode converter type#2 RF  50 mm circular waveguide Beam The number of 12 GHz new RF components were fabricated by CERN and CEA to re-adjust ‘old’ 30 GHz low losses transfer line to the new frequency.

  10. New RF components (closer view) H10-> H01 mode converters and tapers #1 (CEA) RF/vacuum gate valve and pumping port Compact RF pumping port with high vacuum conductivity. H10-> H01 Jog mode converters #2 (CEA)

  11. Dog-leg waveguide line installation status. • All the components are installed. • Connected to accelerated structure and closed for vacuum. • Vacuum leaks checked (tight). Ready to be connected to XBOX1.

  12. RF power transmission measurements S11 data Transmission (simulated) S21 Reconstructed (Xiaowei Wu) Short circuit(+offset) Reflection Matched load • The measured RF power transmission efficiency is 80%. • Reflection is below -27dB. • The group delay time is 75 ns (~23.5 m).

  13. Overall power transmission efficiency 0.87 0.8 Xbox1 wall CTF2 CTF3 • The overall measured RF power transmission efficiency is 67%. • The round group delay time is 230 ns (~35 m). • To provide nominal CLIC RF pulse, XBOX1 klystrons needs to deliver 36 MW x 1.5s

  14. This progress is a result of coherent efforts of many colleagues: TE-VCS XBOX CTF3 RF/PM M. Filippova D. Gudkov P. Guyard A. Olyunin S. Lebet G. Riddone Solodko P. De Souza A. Samochkine S. Doebert, J.L. Navarro S.F. Rey L. Timeo F. Tecker T. Wisznowski A. Degiovanni B. Woolley X. Wu • E. Paju Special thanks to F. Peauger (CEA, France) – mode converts; S. Kuzikov (INP, Russia) – circular waveguides line.

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