The Compact Linear Collider (CLIC) project aims to accelerate and collide electrons and positrons up to 3 TeV center-of-mass energy using a novel two-beam acceleration concept. To prove the feasibility of this technology the CLIC Test Facility CTF3 has been operated during the last years. CALIFES (Concept d’Accelerateur Lineaire pour Faisceau d’Electron Sonde) is an electron linac hosted in the CTF3 complex, which provides a flexible electron beam and the necessary equipment to probe both the two-beam acceleration concept and novel instrumentation to be used in the future CLIC collider. In this paper we describe the CALIFES Linac and its beam characteristics, present recent test results, outline its future program on two-beam module testing and finally discuss about possible future applications as a multi-purpose accelerator technology test facility.

/pdf/califes-a-multi-purpose-electron-beam-for-accelerator-3qa8bh2t4t.pdf

CALIFES: A Multi-Purpose Electron Beam for Accelerator Technology Tests

The CLIC/CTF3 collaboration is studying the feasibility of a multi-TeV electron-positron collider, the so-called CLIC: Compact LInear Collider. The idea is to use a two-beam acceleration scheme at an RF frequency around 12 GHz. In this scheme, the RF power to accelerate the main beam is produced by a high current drive beam. To demonstrate the feasibility of this scheme, the CTF3 facility (CLIC Test Facility 3) has been constructed at CERN. Recently, the complex to generate the drive beam has been successfully commissioned producing a beam with a current 28 A. This beam is now being used to test the power production and main beam acceleration according to the two-beam scheme. The results of the test facility provide vital input for the CLIC conceptual design report that is presently being prepared.

/pdf/the-clic-feasibility-demonstration-in-ctf3-36rz1cg2r6.pdf

The CLIC feasibility demonstration in CTF3

The CLIC project, currently under study at CERN is an electron-positron collider at 3 TeV centre-of-mass energy and luminosity of 2*10 cms. Achieving such luminosity requires a beam dimension of 1 nm in the vertical plane and high beam stability. The TD24 is a traveling wave structure operating at 12 GHz designed to reach 100 MV/m at constant gradient. It consists of two coupling cells and 24 disks. The RF is coupled from cell to cell though an iris of 5.5 mm. To minimize the occurrence of wake-fields and minimize the emittance growth Δεy below 5%, the pre-alignment precision of the electrical centre of the accelerating structure (AS) on its support has to be better than 7 μm. Following, the AS is actively aligned with beam using the wakefield monitor (WFM) signals, with a resolution of 3.5 μm. A test bench for laboratory measurements has been designed and exploits the asymmetry created by RF scattering parameters by an off-centre conductive wire, stretched to locate the electromagnetic centre of the AS. Simulations and preliminary measurement results are presented.

https://cds.cern.ch/record/2146661/files/CERN-ACC-2016-0019.pdf

Electromagnetic Field Pre-alignment of the Compact Linear Collider (CLIC) Accelerating Structure with help of Wakefield Monitor Signals

/pdf/clic-feasibility-demonstration-at-ctf3-4pqg0pwi9w.pdf

CLIC Feasibility Demonstration at CTF3

From mid-2012, the Two Beam Test Stand (TBTS) in the CTF3 Experimental Facility is hosting 2 high gradient accelerating structures powered by a single power extraction and transfer structure in a scheme very close to the CLIC basic cell. We report here about the results obtained with this configuration as: energy gain and energy spread in relation with RF phases and power, octupolar transverse beam effects compared with modelling predictions, breakdown rate and breakdown locations within the structures. These structures are the first to be fitted with Wake Field Monitors (WFM) that have been extensively tested and used to further improve the structures alignment on the beam line. These results show the unique capabilities of this test stand to conduct experiments with real beams.

Recent Results from CTF3 Two Beam Test Stand

To achieve high luminosity in CLIC, the accelerating structures must be aligned to an accuracy of 5 µm with respect to the beam trajectory. Position detectors called Wakefield Monitors (WFM) are integrated to the structure for a beam based alignment. This paper describes the requirements of such monitors. Detailed RF design and electromagnetic simulations of the WFM itself are presented. In particular, time domain computations are performed and an evaluation of the resolution is done for two higher order modes at 18 and 24 GHz. The mechanical design of a prototype accelerating structure with WFM is also presented as well as the fabrication status of three complete structures. The objective is to implement two of them in CTF3 at CERN for a feasibility demonstration with beam and high power rf.

/pdf/wakefield-monitor-development-for-clic-accelerating-1dva2myrov.pdf

Wakefield monitor development for clic accelerating structure

The CLIC (Compact LInear Collider) study is a site independent study exploring technological developments to extend linear colliders into the Multi-TeV colliding beam energy range. The two-beam linear accelerator being studied at CERN involves the design and integration of many different technical systems, tightly bound and influencing each other. For the construction of two linacs it has been decided to proceed with a modular design, and repetitive two-beam modules of a few types were defined. The modules consist of micron-level precision components operating under ultra-high vacuum as required by the beam physics. For the CLIC Conceptual Design Report, the development and system integration is mainly focused on the most complex module type containing the highest number of components and technical systems. For proving the proper functioning of the needed technical systems and confirming their feasibility it has been decided to build four prototype modules and test them without beam. In addition, three modules have to be produced in parallel for tests with beam in the CLIC Experimental Area. This paper is focused on the design of the different technical systems and integration issues of the two-beam module. The experimental program for the prototype modules is also recalled.

/pdf/clic-two-beam-module-for-the-clic-conceptual-design-and-44ah5dpnqr.pdf

Clic two-beam module for the clic conceptual design and related experimental program*

The CLEX building in the CTF3 facility is the place where essential experiments are performed to validate the Two-Beam Acceleration scheme upon which the CLIC project relies. The Drive Beam enters the CLEX hall after being recombined in the Delay loop and the Combiner Ring in intense beam trains of 24 A - 120 MeV lasting 140 ns and bunched at 12 GHz, although other beam parameters are also accessible. This beam is then decelerated in dedicated structures installed in the Test Beam Line (TBL) and in the Two-Beam Test Stand (TBTS) aimed at delivering bursts of 12 GHz RF power. In the TBTS this power is used to generate a high accelerating gradient of 100 MV/m in specially designed accelerating structures. To assess the performances of these structures a probe beam is used, produced by a second Linac. We report here various experiments conducted in the TBTS making use of the versatility of the probe beam and of dedicated diagnostics.

Two Beam Test Stand Experiments in the CTF3 Facility

The accelerating structures (AS) are one of the main components of the Compact LInear Collider (CLIC), under study at CERN. Each accelerating structure contains about 30 copper discs, which form the accelerating cavity. The requirements of different technical systems, such as vacuum and cooling, have to be considered during the engineering design. A fully featured AS is very challenging and requires several technologies. Different damping methods, waveguides, vacuum manifolds, slots and chokes, result in various design configurations. In the CLIC AS each cell is damped by means of four waveguides coupled to the cell. The vacuum manifolds combine a number of functions such as damping, vacuum pumping and cooling. A silicon carbide absorber, fixed inside of each manifold, is required for effective damping of Higher Order Modes (HOMs). This paper describes the engineering design of the X-band AS with damping material, and focuses on few technical solutions.

/pdf/engineering-design-and-fabrication-of-tapered-damped-x-band-xyka0rgj3m.pdf

Engineering design and fabrication of tapered damped x-band accelerating structures

E1 gi1 eeri1 g desig1 a1 d fabricatio1 of tapered damped x-ba1 d accelerati1 g structures

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