E. Yamakawa

Beam stacking experiment at a fixed field alternating gradient accelerator

T. Uesugi, Y. Ishi, Y. Kuriyama, Y. Mori et autres

A key challenge in particle accelerators is to achieve high peak intensity. Space charge is particularly strong at lower energy such as during injection and typically limits achievable peak intensity. The beam stacking technique can overcome this limitation by accumulating a beam …

jp, gb (code pays fourni par la source)

Beam Stacking Experiment at a Fixed Field Alternating Gradient Accelerator

T. Uesugi, Y. Ishi, Y. Kuriyama, Y. Mori et autres

A key challenge in particle accelerators is to achieve high peak intensity. Space charge is particularly strong at lower energy such as during injection and typically limits achievable peak intensity. The beam stacking technique can overcome this limitation by accumulating a beam …

jp, fr, us (code pays fourni par la source)

First demonstration of the use of crab cavities on hadron beams

R. Calaga, A. Alekou, Fanouria Antoniou, R. B. Appleby et autres

Many future particle colliders require beam crabbing to recover geometric luminosity loss from the nonzero crossing angle at the interaction point (IP). A first demonstration experiment of crabbing with hadron beams was successfully carried out with high energy protons. This breakthrough result …

ch, gb, us, pl (code pays fourni par la source)

FETS-FFA Ring Study

Jean-Baptiste Lagrange, Stephen J. Brooks, Craig Brown, David Kelliher et autres

ISIS is the spallation neutron source at the Rutherford Appleton Laboratory in the UK, providing a proton beam with a power of 0.2~MW. Detailed studies are under way for a major upgrade, including the use of Fixed Field alternating gradient Accelerator (FFA). …

gb, us (code pays fourni par la source)

Longitudinal Dynamics in the Prototype vFFA Ring for ISIS2

David Kelliher, Jean-Baptiste Lagrange, Alan Letchford, S. Machida et autres

A vertical Fixed Field Accelerator (vFFA) is a candidate for a future high-power (MW-class) spallation source at ISIS. In order to assess the feasibility of this novel ring, a prototype is currently being designed. Here we consider the longitudinal dynamics in the …

gb (code pays fourni par la source)

Luminosity reduction caused by phase modulations at the HL-LHC crab cavities

E. Yamakawa, R. Apsimon, P. Baudrenghien, R. Calaga et autres

gb, ch (code pays fourni par la source)

Activation in injection area of J-PARC 3-GeV rapid cycling synchrotron and its countermeasures

Kazami Yamamoto, E. Yamakawa, Taisuke Takayanagi, N. Miki et autres

The electron accelerators for the AWAKE experiment at CERN—Baseline and Future Developments

K. Pépitone, S. Doebert, R. Apsimon, J. Bauche et autres

The AWAKE collaboration prepares a proton driven plasma wakefield acceleration experiment using the SPS beam at CERN. A long proton bunch extracted from the SPS interacts with a high power laser and a 10 m long rubidium vapor plasma cell to create …

ch, gb, ca (code pays fourni par la source)

Luminosity Reduction Caused by the Full-Detuning LLRF Scheme on the HL-LHC Crab Cavities

E. Yamakawa, R. Apsimon, P. Baudrenghien, R. Calaga et autres

The High-Luminosity LHC (HL-LHC) crab cavities (CCs) will be installed on both sides of IP1 (ATLAS) and IP5 (CMS) to compensate for the geometric luminosity reduction due to the crossing angle. To cope with the increased beam current (0.55 A DC for …

gb, ch (code pays fourni par la source)

CERN Yellow Reports, Vol 4 (2016): Updated Baseline for a staged Compact Linear Collider

The CLIC, CLICdp collaborations, Mark Boland, U. Felzmann et autres

The Compact Linear Collider (CLIC) is a multi-TeV high-luminosity linear e+e- collider under development. For an optimal exploitation of its physics potential, CLIC is foreseen to be built and operated in a staged approach with three centre-of-mass energy stages ranging from a …

Updated baseline for a staged Compact Linear Collider

Mark Boland, Eva Barbara Holzer, Grigori D. Shirkov, J P Delahaye et autres

The Compact Linear Collider (CLIC) is a multi-TeV high-luminosity linear e+e- collider under development. For an optimal exploitation of its physics potential, CLIC is foreseen to be built and operated in a staged approach with three centre-of-mass energy stages ranging from a …

au (code pays fourni par la source)

Analysis of Asymmetry Tolerances and Cross-coupling in Cavity BPMs

E. Yamakawa, Stewart Boogert, A. Lyapin, Laurence Nevay et autres

Geometric asymmetries in cavity BPMs result in a coupling between horizontal and vertical signals, which complicates their usage and may affect both the dynamic range and spatial resolution of the system in both directions. Tolerances to several types of geometric asymmetries have …

gb (code pays fourni par la source)