The Compact Linear Collider (CLIC) is an e + /e - collider based on the two-beam acceleration principle, proposed to support precision high-energy physics experiments in the energy range 0.5-3 TeV [1]. To achieve a high luminosity of up to 6x10 34 cm -2 s -1 , the transport and preservation of a low emittance beam is mandatory. A large number and great variety of beam diagnostics instruments is foreseen to verify and guarantee the required beam quality. We discuss the status of the beam diagnostics developments and experimental results accomplished at the CLIC Test Facility (CTF) and at the Cornell University CesrTA ring accelerator.

/pdf/status-of-the-clic-ctf-beam-instrumentation-r-d-3vtu38jer7.pdf

Status of the CLIC/CTF Beam Instrumentation R&D

The Shintake Monitor is an essential beam tuning device installed at the interaction point of ATF2, the final focus test beam line for ILC, to measure its O(10) nm order vertical e - beam sizes (σ y ). The e - beam collides with a target of laser interference fringes, and σ y is derived from the modulation depth of the resulting Compton signal photons measured by a downstream photon detector. The laser optics is designed to accommodate a wide range of σ y from 25 nm to a few µm with better than 10% accuracy. Being the only existing device capable of measuring σ y < 100 nm, the Shintake Monitor is crucial for verifying ATF2's Goal 1 of focusing σ y down to the design value of 37 nm. It has demonstrated measurement stability of about 5%. Major improvements in hardware and measurement schemes contributed to suppressing error sources. This paper describes the design concepts and performance of Shintake Monitor, focusing on an extensive study of systematic errors with the aim of precisely extracting σ y from the measured modulation.

/pdf/measurement-of-nm-electron-beam-sizes-using-laser-1ucrk5n42d.pdf

Measurement of nm Electron Beam Sizes using Laser Interference by Shintake Monitor

Measurement of nanometer electron beam sizes using laser interference by Shintake Monitor

The optics design of the final turnaround regions for the CLIC drive beam is presented. This includes the extraction region, the turnaround loop and the phase feed forward chicane for correcting errors on the bunch phase. The design specifications of the kicker and septum magnets are provided. Tracking simulations and detailed studies of coherent and incoherent synchrotron radiation have been used to optimise the optics in the turnaround region in order to minimise transverse and longitudinal emittance growth.

/pdf/design-considerations-of-the-final-turnaround-regions-for-3cj5vlslmk.pdf

Design Considerations of the Final Turnaround Regions for the CLIC Drive Beam

In this thesis we present the first Placet2 recombination simulations of the drive beam recombination complex (DBRC) design for the compact linear collider (CLIC). We start by presenting a review of the CLIC project and the DBRC’s role and design within it. We then discuss some of the core principles of beam dynamics and how tracking codes like Placet2 implement them. We follow that by presenting the design issues raised by our simulations and our proposed strategy to address them, key among which is a previously unknown parabolic dependency of the longitudinal position to the momentum (T566), which threatens the efficiency of the power extraction structures. Through iterative optimisation of the design, we eliminated this aberration both in the delay loop and in combiner ring 1. We also found the beam’s horizontal emittance to be significantly over the design budget (150μm) and attempted to meet that budget, reaching 157μm. In order to obtain this emittance value, an update to the combiner ring 2’s injection scheme was necessary. On the vertical plane, which has the same emittance budget, it was kept at 127μm.

/pdf/simulation-and-optimisation-of-clic-s-recombination-complex-1sm87of70t.pdf

Simulation and Optimisation of CLIC's recombination complex

For the commissioning and operation of modern particle accelerators, automated error detection and diagnostics methods are becoming increasingly important. In this paper, we present two such methods, which are capable of localising sources of beam offset jitter with a combination of correlation studies and so called degree of freedom plots. The methods were applied to the ATF2 beam line at KEK, where one of the major goals is the reduction of the beam offset jitter. Results of this localisation are shown in this paper. A big advantage of the presented method is its high robustnessespeciallyto varyingopticsparameters. Therefore, we believe that the developed beam offset jitter localisation methods can be easily applied to other accelerators.

/pdf/localisation-of-beam-offset-jitter-sources-at-atf2-56lextw71v.pdf

Localisation of beam offset jitter sources at atf2

The Drive Beam complex of the Compact Linear Collider must use short bunches with a large charge making beam transport susceptible to unwanted effects of Coherent Synchrotron Radiation emitted in the dipole magnets. We present the effects of transporting the beam within a limited aperture which decreases the magnitude of the CSR wake. The effect, known as CSR shielding, eases the design of key components of the facility.

/pdf/effect-of-csr-shielding-in-the-compact-linear-collider-42ed3wdujr.pdf

Effect of CSR Shielding in the Compact Linear Collider

Six UK institutes are engaged in a collaborative R&D programme with CERN aimed at demonstrating key aspects of technology feasibility for the Compact Linear Collider (CLIC). We give an overview and status of: 1) Drive-beam components: quadrupole magnets and the beam phase feed-forward prototype. 2) Beam instrumentation: stripline and cavity beam position monitors, an electro-optical longitudinal bunch profile monitor, and laserwire and diffraction and transition radiation monitors for transverse beam-size determination. 3) Beam delivery system and machinedetector interface design, including beam feedback/control systems and crab cavity design and control. 4) RF structure design. In each case we report on the status of prototype systems and performance tests with beam at the CTF3, ATF2 and CESRTA test facilities, including plans for future experiments.

https://cds.cern.ch/record/2003136/files/tupme008.pdf

Status of the CLIC-UK R\D Programme on Design of Key Systems for the Compact Linear Collider

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Localisation of beam offset jitter sources at atf2

Effect of CSR Shielding in the Compact Linear Collider

Status of the CLIC-UK R\D Programme on Design of Key Systems for the Compact Linear Collider