The Collimation System of the High Energy Beam Transfer (HEBT) Line (original) (raw)

Comparison of the TESLA, NLC and CLIC beam-collimation system performance

… , 2003. PAC 2003. …, 2003

This note describes studies performed in the framework of the Collimation Task Force organized to support the work of the International Linear Collider Technical Review Committee. The post-linac beam-collimation systems in the TESLA, JLC/NLC and CLIC linear-collider designs are compared using the same computer code under the same assumptions. Their performance is quantified in terms of beam-halo and synchrotron-radiation collimation efficiency. The performance of the current designs varies across projects and does not always meet the original design goals. However, these comparisons suggest that achieving the required performance in a future linear collider is feasible. The post-TRC plans of the Collimation Task Force are outlined briefly in closing.

DESIGN OF POST LINAC BEAM TRANSPORT FOR THE UK NEW LIGHT SOURCE PROJECT

The design of free electron laser (FEL) driver needs careful beam transport design to pass very short bunches through the switchyard/spreader to switch the beam to different FEL lines. The spreader design which allows flexibility in operation has been adapted following the LBNL design [1]. In order to measure the slice properties of the bunches two beam diagnostics lines are proposed, a straight one for beam commissioning purposes and a branch of the spreader similar to the FEL lines to measure the adverse effects that may arise due to passing the short bunches through the kicker and septum magnets. As a part of machine protection, post linac collimation system collimates the halo particles in transverse and energy planes. The design of the collimation, beam spreader and beam diagnostics lines is discussed.

Numerical Study of a Collimation System to Mitigate Beam Losses in the Ess Linac

The European Spallation Source (ESS) will be a 5 MW proton linac to produce spallation neutrons. A high power linac has a very low tolerance on beam losses, typi-cally on the order of 1 W/m, to avoid activation of the linac components; hence, emittance and halo of the beam must be well controlled throughout the linac. A system of col-limators in beam transport sections has been studied and tested as a means to mitigate the beam losses in several linacs. This paper presents the result of a numerical study of a collimation system for the ESS linac.

Performance Studies of a Single Vertical Beam Halo Collimation System at ATF2

2017

In order to reduce the background that could limit the precision of the diagnostics located in the ATF2 post-IP beamline a single vertical beam halo collimation system was installed and commissioned in March 2016. In this paper, we present the measurements done in March and May 2016 in order to characterize the collimation system performance. Furthermore, the collimator wakefield impact has been measured and compared with theoretical calculations and numerical simulations in order to determine the most efficient operation mode of the collimation system in terms of halo cleaning and negligible wakefield impact.

Beam Loss and Collimation in the Ess Linac

The European Spallation Source (ESS), to be built in Lund, Sweden, is a spallation neutron source based on a 5 MW proton linac. A high power proton linac has a tight tolerance on beam losses to avoid activation of its compo-nents and it is ideal to study patterns of the beam loss and prepare beam loss mitigation schemes at the design stage. This paper presents simulations of the beam loss in the ESS linac as well as beam loss mitigation schemes using colli-mators in beam transport sections.

Mechanisms of beam-halo formation in high-intensity linacs

AIP Conference Proceedings, 1995

An rms-mismatched beam with space-charge forces can evolve rapidly, and during the course of evolution its emittance grows and a diffuse halo forms. The halo is of particular concern for long-term operation of linacs such as those envisioned for accelerator transmutation of waste (ATW) because too much particle impingement on the accelerating structures would cause enough radioactivation to prohibit routine hands-on maintenance. Thus, halo suppression is a design consideration for these linacs. In this paper, we summarize both the physical processes associated with the rapid evolution of the rms-mismatched beam and a semianalytic formalism which was recently developed to account for them. We also provide representative results derived from the formalism.

Beam Losses Due to Intra-Beam And Residual Gas Scattering For Cornell's Energy Recovery Linac

EPAC2008, 2008

Because of small beam emittance and high beam intensity, intra-beam scattering (IBS) in an energy recovery linac (ERL) can be a source of significant beam loss causing radiation doses. The doses should be carefully examined for adequate design of radiation protection. Additionally, the beam particle scattering on the residual gas nuclei (RGS), can cause significant irradiation and consequently can damage the insertion devices (IDs) with small vertical aperture.