Abstract

CLIC (compact linear collider) is a future e+e− collider based on normal-conducting technology, currently under study at CERN. Its design is based on a novel two-beam acceleration scheme. The main beam gets RF power extracted from a drive beam through power extraction and transfer structures (PETS). The technical feasibility of CLIC is currently being proved by its Third Test Facility (CTF3) which includes the CLIC experimental area (CLEX). Two Double Length CLIC PETS will be installed in CLEX to validate their performance with beam. This paper is focused on the engineering design, fabrication and validation of this PETS first prototype. The design consists of eight identical bars, separated by radial slots in which damping material is located to absorb transverse wakefields, and two compact couplers placed at both ends of the bars to extract the generated power. The PETS bars are housed inside a vacuum tank designed to make the PETS as compact as possible. Several joint techniques such as vacuum brazing, electron beam and arc welding were used to complete the assembly. Finally, several tests such as dimensional control and leak testing were carried out to validate design and fabrication methods. In addition, RF measurements at low power were made to study frequency tuning.

Highlights

  • Up to now, the most important e þeÀ collider has been the large electron–positron collider (LEP), built at CERN and in operation up to 2000

  • In order to reach that collision energy a two beam scheme has been designed, where the required RF power is extracted from a drive beam parallel to the main beam [1]

  • This paper describes the engineering design, fabrication, assembly and RF low power testing of the first prototype of the Double Length CLIC power extraction and transfer structures (PETS)

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Summary

Introduction

The most important e þeÀ collider has been the large electron–positron collider (LEP), built at CERN and in operation up to 2000. The technical feasibility of CLIC is currently being proved at CTF3 It comprises several test lines, including CLEX as the line where the two-beam acceleration design will be studied in a relativistic environment, with a careful consideration to alignment, stabilization, cooling, vacuum systems and phase stability [4]. The limited current of 30 A in the drive beam of CTF3 does not allow operating the two-beam module at parameters foreseen for CLIC. An additional input coupler was added to Double Length PETS with respect to CLIC PETS design; it allows the RF power distribution and recirculation along the structure [6,7].

Engineering design
Copper rods
Compact couplers
Vacuum tank and final assembly
4: Beam pipe male female male female
RF measurements
Compact couplers measurements
Findings
Conclusions
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