Papers by Reidar L Lillestøl
Conf. Proc., 2011
Abstract: The objective of the CLIC Test Facility CTF3 is to demonstrate the feasibility issues o... more Abstract: The objective of the CLIC Test Facility CTF3 is to demonstrate the feasibility issues of the CLIC two-beam technology: the efficient generation of a very high current drive beam, used as the power source to accelerate the main beam to multi-Te V energies with gradient over 100MeV/m, stable drive beam deceleration over long distances. Results on successful beam acceleration with over 100 MeV/m energy gain are shown. Measurements of drive beam deceleration over a chain of Power Extraction Structu res are presented. The ...
The Compact Linear Collider international collaboration is pursuing an extensive R&D program towa... more The Compact Linear Collider international collaboration is pursuing an extensive R&D program towards a multi-TeV electron-positron collider. In particular, the development of two-beam acceleration technology is the focus of the CLIC test facility CTF3. In this paper we summarise the most recent results obtained at CTF3: the results of the studies on the drive beam generation are presented, the achieved two beam acceleration performance is reported and the measured breakdown rates and related observations are summarised. The stability of the deceleration process performed over 12 subsequent modules and a comparison of the obtained results with the theoretical expectations are discussed. We also outline the future experimental program.
Conf. Proc., 2011
Abstract: The objective of the CLIC Test Facility CTF3 is to demonstrate the feasibility issues o... more Abstract: The objective of the CLIC Test Facility CTF3 is to demonstrate the feasibility issues of the CLIC two-beam technology: the efficient generation of a very high current drive beam, used as the power source to accelerate the main beam to multi-Te V energies with gradient over 100MeV/m, stable drive beam deceleration over long distances. Results on successful beam acceleration with over 100 MeV/m energy gain are shown. Measurements of drive beam deceleration over a chain of Power Extraction Structu res are presented. The ...
The CLIC Test Facility 3 Test Beam Line is the first prototype for the CLIC drive beam decelerato... more The CLIC Test Facility 3 Test Beam Line is the first prototype for the CLIC drive beam decelerator. Stable transport of the drive beam under deceleration is a mandatory component in the CLIC two-beam scheme. In the Test Beam Line more than 50% of the total energy will be extracted from a 150 MeV, 28 A electron drive beam, by
The Test Beam Line in the CLIC Test Facility 3 is the first prototype of the CLIC drive beam dece... more The Test Beam Line in the CLIC Test Facility 3 is the first prototype of the CLIC drive beam decelerator. The main purpose of the experiment is to demonstrate efficient 12 GHz rf power production and stable transport of an elec-tron drive beam during deceleration. The Test Beam Line consists of a FODO structure with high precision BPMs and quadrupoles mounted on mechanical movers for pre-cise beam alignment. Nine out of the planned 16 Power Extraction and Transfer Structures have currently been in-stalled and commissioned. We correlate rf power produc-tion measurements with the drive beam deceleration mea-surements, and compare the two measurements to the theo-retical predictions. We also discuss the impact of the drive beam bunch length and bunch combination on the measure-ments.
In the CLIC two-beam scheme, the main beam is accel-erated by rf power provided by energy extract... more In the CLIC two-beam scheme, the main beam is accel-erated by rf power provided by energy extraction from a secondary drive beam. This energy is extracted in deceler-ators, and the first prototype decelerator is the Test Beam Line in the CLIC Test Facility 3. The line is currently equipped with 12 Power Extraction and Transfer Structures (PETS), which allows for extracting up to 40 % of the beam energy. We correlate the measured deceleration with pre-dictions from the beam current and the rf power produced in the PETS. We also discuss recent bunch length measure-ments and how it influences the deceleration. Finally we look at the evolution of the transverse emittance.
The CLIC Test Facility (CTF3) at CERN was constructed by the CTF3 collaboration to study the feas... more The CLIC Test Facility (CTF3) at CERN was constructed by the CTF3 collaboration to study the feasibility of the concepts for a compact linear collider. The test beam line (TBL) recently added to the CTF3 machine was designed to study the CLIC decelerator beam dynamics and 12 GHz power production. The beam line consists of a FODO lattice with high
The CLIC main beam is accelerated by rf power gener-ated from a high-intensity, low-energy electr... more The CLIC main beam is accelerated by rf power gener-ated from a high-intensity, low-energy electron drive beam. The accelerating fields are produced in Power Extraction and Transfer Structures, and are strongly dependent on the drive beam bunch distribution, as well as other parameters. We investigate how longitudinal space charge affects the bunch distribution and the corresponding power produc-tion, and discuss how the bunch length evolution can af-fect the main beam. We also describe the development of a Particle-in-Cell space charge solver which was used for the study.
The CLIC linear collider is based on the two beams acceleration scheme. During acceleration of th... more The CLIC linear collider is based on the two beams acceleration scheme. During acceleration of the colliding beams, the drive beam suffers a large build up on its energy spread. In order to efficiently transport such a beam, beam-based alignment techniques together with tight prealignment tolerances are crucial. To evaluate the performance of these steering algorithms, a beam-based steering campaign
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Papers by Reidar L Lillestøl