F. Tecker
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View article: Injection and Extraction
Injection and Extraction Open
This paper gives an overview of the beam injection and extraction principles for accelerators. After a brief general introduction, it explains different methods of injecting the beam for hadron and lepton machines. It describes single- and…
View article: Longitudinal Beam Dynamics in Circular Accelerators
Longitudinal Beam Dynamics in Circular Accelerators Open
This paper gives an introduction of longitudinal beam dynamics for circular accelerators. After briefly discussing some types of circular accelerators, it focuses on particle motion in synchrotrons. It summarizes the equations of motion, d…
View article: Diagnostics Examples from CTF3
Diagnostics Examples from CTF3 Open
After a short introduction of CLIC, the Compact Linear Collider, and its test facility CTF3 (CLIC Test Facility 3), this paper gives an overview and some examples of the diagnostics used at CTF3.
View article: Longitudinal Beam Dynamics -- Recap
Longitudinal Beam Dynamics -- Recap Open
This paper gives a very brief summary of longitudinal beam dynamics for both linear and circular accelerators. After discussing synchronism conditions in linacs, it focuses on particle motion in synchrotrons. It summarizes the equations of…
View article: Transverse emittance measurement in the CERN Proton Synchrotron in view of beam production for the High-Luminosity LHC
Transverse emittance measurement in the CERN Proton Synchrotron in view of beam production for the High-Luminosity LHC Open
In the framework of the LHC Injectors Upgrade project the improvements required to achieve the parameters of the future beams for the High-Luminosity LHC are being studied and implemented. In order to deliver high brightness beams, control…
View article: Advancing the CERN proton synchrotron multiturn extraction towards the high-intensity proton beams frontier
Advancing the CERN proton synchrotron multiturn extraction towards the high-intensity proton beams frontier Open
Complementary to the physics research at the LHC, several fixed-target facilities receive beams from the LHC injector complex. To serve the fixed-target physics programme at the super proton synchrotron, high-intensity proton beams from th…
View article: Matching Studies Between CERN PSB and PS Through Multi-Turn Beam Profile Acquisitions
Matching Studies Between CERN PSB and PS Through Multi-Turn Beam Profile Acquisitions Open
In the framework of the LHC Injectors Upgrade (LIU) project, the investigation and quantification of the optics mismatch between the CERN Proton Synchrotron Booster (PSB) and PS is a crucial step in understanding the source of horizontal e…
View article: Beam-loading effect on breakdown rate in high-gradient accelerating cavities: An experiment at the Compact Linear Collider Test Facility at CERN
Beam-loading effect on breakdown rate in high-gradient accelerating cavities: An experiment at the Compact Linear Collider Test Facility at CERN Open
Radio frequency breakdown rate is a crucial performance parameter that ensures that the design luminosity is achieved in the CLIC linear collider. The required low breakdown rate for CLIC, of the order of 10$^{-7}$ breakdown pulse${-1}$ m$…
View article: Experimental Studies on Drive Beam Generation in CTF3
Experimental Studies on Drive Beam Generation in CTF3 Open
The objective of the CLIC Test Facility CTF3, built at CERN by an international collaboration, is to demonstrate the main feasibility issues of the CLIC two-beam technology by 2010. CTF3 consists of a 150 MeV electron linac followed by a 4…
View article: Approaching the High-Intensity Frontier Using the Multi-Turn Extraction at the CERN Proton Synchrotron
Approaching the High-Intensity Frontier Using the Multi-Turn Extraction at the CERN Proton Synchrotron Open
Complementary to the physics research at the LHC, several fixed target facilities receive beams from the LHC injector complex. In the scope of the fixed target physics program at the Super Proton Synchrotron, high-intensity proton beams fr…
View article: First Experiments at the CLEAR User Facility
First Experiments at the CLEAR User Facility Open
The new "CERN Linear Electron Accelerator for Research" (CLEAR) facility at CERN started its operation in fall 2017. CLEAR results from the conversion of the CALIFES beam line of the former CLIC Test Facility (CTF3) into a new testbed for …
View article: High-Brightness Challenges for the Operation of the CERN Injector Complex
High-Brightness Challenges for the Operation of the CERN Injector Complex Open
CERN's LHC injectors are delivering high-brightness proton and ion beams for the Large Hadron Collider LHC. We review the present operation modes and beam performance, and highlight the limitations. We will then give an overview of the upg…
View article: THE (7,7) OPTICS AT CERN PS
THE (7,7) OPTICS AT CERN PS Open
The PS lattice is composed by one hundred combined function magnets, which set the bare tune of the machine to (Qh, Qv) = (6.25, 6.28). Low energy quadrupoles are used at injection to move the tune in a limited working point area. In parti…
View article: The CLEAR user facility at CERN
The CLEAR user facility at CERN Open
The conversion of the CALIFES beamline of CTF3 into the “CERN Linear Electron Accelerator for Research” (CLEAR) facility was approved in December 2016. The primary focus for CLEAR is general accelerator R&D; and component studies for exist…
View article: Longitudinal Beam Dynamics - Recap
Longitudinal Beam Dynamics - Recap Open
The course gives a very brief summary of longitudinal beam dynamics for both linear and circular accelerators. After discussing the synchronism conditions in linacs, it focuses on the particle motion in synchrotrons. It summarizes the equa…
View article: Dispersion Free and Dispersion Target Steering Experience at CTF3
Dispersion Free and Dispersion Target Steering Experience at CTF3 Open
One of the goals of the CLIC Test Facility (CTF3) at CERN is to demonstrate the feasibility of the CLIC Drive Beam recombination, which takes place in the Drive Beam Recombination Complex (DBRC). The tight geometry of the DBRC together wit…
View article: Transverse Beam Phase-Space Measurement Experience at CTF3
Transverse Beam Phase-Space Measurement Experience at CTF3 Open
One of the objective of the CLIC Test Facility (CTF3) at CERN is to demonstrate the CLIC Drive Beam Recombination concept. An accurate control of the transverse beam parameters is necessary in order to succeed in preserving the beam qualit…
View article: Results of the Beam-Loading Breakdown Rate Experiment at the CLIC Test Facility CTF3
Results of the Beam-Loading Breakdown Rate Experiment at the CLIC Test Facility CTF3 Open
The RF breakdown rate is crucial for the luminosity performance of the CLIC linear collider. The required breakdown rate at the design gradient of 100 MV/m has been demonstrated, without beam presence, in a number of 12 GHz CLIC prototype …
View article: A Versatile Beam Loss Monitoring System for CLIC
A Versatile Beam Loss Monitoring System for CLIC Open
The design of a potential CLIC beam loss monitoring (BLM) system presents multiple challenges. To successfully cover the 48 km of beamline, ionisation chambers and optical fibre BLMs are under investigation. The former fulfils all CLIC req…
View article: Effect and Optimisation of Non-Linear Chromatic Aberrations of the CLIC Drive Beam Recombination at CTF3
Effect and Optimisation of Non-Linear Chromatic Aberrations of the CLIC Drive Beam Recombination at CTF3 Open
The CLIC design relies on the two-beam acceleration principle, i.e. the energy transfer from the so called drive beam to the main colliding beams. At the CLIC Test Facility (CTF3) at CERN the feasibility of this principle is being tested i…
View article: Status and Plans for Completion of the Experimental Programme of the Clic Test Facility Ctf3
Status and Plans for Completion of the Experimental Programme of the Clic Test Facility Ctf3 Open
The CLIC Test Facility CTF3 was build, commissioned and operated at CERN by an international collaboration, with the aim of validating the CLIC two beam acceleration scheme, in which the RF power used to accelerate e⁺/e⁻ beams is extracted…
View article: Beam-Loading Effect on Breakdown Rate in High-Gradient Accelerating Structures
Beam-Loading Effect on Breakdown Rate in High-Gradient Accelerating Structures Open
The Compact Linear Collider (CLIC) study for a future electron-positron collider with a center-of-mass energy up to 3 TeV aims for an accelerating gradient of 100 MV/m. The gradient is limited by RF breakdowns, and the luminosity requireme…
View article: RF Cavity Induced Sensitivity Limitations on Beam Loss Monitors
RF Cavity Induced Sensitivity Limitations on Beam Loss Monitors Open
Due to the secondary showers generated when a particle hits the vacuum chamber, beam losses at an accelerator may be detected via radiation detectors located near the beam line. Several sources of background can limit the sensitivity and r…