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Title: 30 GHz High Power Production for CLIC

Abstract

The CLIC Power Extraction and Transfer Structure (PETS) is a passive microwave device in which bunches of the drive beam interact with the impedance of the periodically loaded waveguide and excite preferentially the synchronous TM01 mode at 30 GHz. The RF power produced (several hundred MW) is collected at the downstream end of the structure by means of the Power Extractor and conveyed to the main linac structure. The PETS geometry is a result of multiple compromises between beam stability along single decelerator (600 m) and active length of the structure given by main linac RF power needs and layout. Surface electric and magnetic fields, power extraction method, HOM damping, ON/OFF capability and fabrication technology were all evaluated to provide reliable design.

Authors:
 [1]
  1. CERN, Geneva (Switzerland)
Publication Date:
OSTI Identifier:
20787683
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 807; Journal Issue: 1; Conference: 7. workshop on high energy density and high power RF, Kalamata (Greece), 13-17 Jun 2005; Other Information: DOI: 10.1063/1.2158811; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; COLLIDING BEAMS; DAMPING; DESIGN; ELECTRON BEAMS; FABRICATION; GEOMETRY; GHZ RANGE; IMPEDANCE; LINEAR COLLIDERS; MAGNETIC FIELDS; MICROWAVE RADIATION; PERIODICITY; POSITRON BEAMS; POWER GENERATION; RF SYSTEMS; WAVEGUIDES

Citation Formats

Syratchev, I. 30 GHz High Power Production for CLIC. United States: N. p., 2006. Web. doi:10.1063/1.2158811.
Syratchev, I. 30 GHz High Power Production for CLIC. United States. doi:10.1063/1.2158811.
Syratchev, I. Tue . "30 GHz High Power Production for CLIC". United States. doi:10.1063/1.2158811.
@article{osti_20787683,
title = {30 GHz High Power Production for CLIC},
author = {Syratchev, I.},
abstractNote = {The CLIC Power Extraction and Transfer Structure (PETS) is a passive microwave device in which bunches of the drive beam interact with the impedance of the periodically loaded waveguide and excite preferentially the synchronous TM01 mode at 30 GHz. The RF power produced (several hundred MW) is collected at the downstream end of the structure by means of the Power Extractor and conveyed to the main linac structure. The PETS geometry is a result of multiple compromises between beam stability along single decelerator (600 m) and active length of the structure given by main linac RF power needs and layout. Surface electric and magnetic fields, power extraction method, HOM damping, ON/OFF capability and fabrication technology were all evaluated to provide reliable design.},
doi = {10.1063/1.2158811},
journal = {AIP Conference Proceedings},
number = 1,
volume = 807,
place = {United States},
year = {Tue Jan 03 00:00:00 EST 2006},
month = {Tue Jan 03 00:00:00 EST 2006}
}
  • The Compact Linear Collider (CLIC) Test Facility (CTF II) at CERN has recently demonstrated Two-Beam power production and acceleration at 30 GHz. With 41 MW of 30 GHz power produced in 14 ns pulses at a repetition rate of 5 Hz, the main beam has been accelerated by 28 MeV. The 30 GHz RF power is extracted in low impedance decelerating structures from a low-energy, high-current 'drive beam' which runs parallel to the main beam. The average current in the drive-beam train is 25 A, while the peak current exceeds 2 kA. Crosschecks between measured drive-beam charge, 30 GHz powermore » and main-beam energy gain are in good agreement. In this paper, some relevant experimental and technical issues on drive-beam generation, two-beam power production and acceleration are presented.« less
  • Efficiency estimations of the 30 GHz RF power generation system at the CERN CLIC are presented. CLIC operates with single bunch beams at 500 GeV center of mass energies. Descriptions of the isochronous collector ring and the switchyard are given. (AIP)
  • A fundamental element of the CLIC concept is two-beam acceleration, where RF power is extracted from a high current, low energy drive beam in order to accelerate the low current main beam to high energy. The CLIC Power Extraction and Transfer Structure (PETS) is a passive microwave device in which bunches of the drive beam interact with the constant impedance of the periodically loaded waveguide and excite preferentially the synchronous mode. The RF power produced is collected downstream of the structure by means of the RF power extractor; it is delivered to the main linac using the waveguide network connectingmore » the PETS to the main CLIC accelerating structures. The PETS should produce 135 MW at 240 ns RF pulses at a very low breakdown rate: BDR < 10{sup -7}/pulse/m. Over 2010, a thorough high RF power testing program was conducted in order to investigate the ultimate performance and the limiting factors for the PETS operation. The testing program is described and the results are presented.« less
  • The CLIC Power Extraction and Transfer Structure (PETS) is a passive microwave device in which bunches of the drive beam interact with the impedance of the periodically loaded waveguide and generate RF power for the main linac accelerating structure. The demands on the high power production ({approx} 150 MW) and the needs to transport the 100 A drive beam for about 1 km without losses, makes the PETS design rather unique and the operation very challenging. In the coming year, an intense PETS testing program will be implemented. The target is to demonstrate the full performance of the PETS operation.more » The testing program overview and test results available to date are presented.« less