Welcome: Introduction and aim of the meeting

• Heine Thomsen (ISA, Aarhus University)

Room: Linneasalen

Status of the ESS Accelerator

• Mohammad Eshraqi (European Spallation Source ESS AB)

Room: Linneasalen

The ESS HEBT Beam Physics: Collimator Opportunities & Requirements

• Heine Thomsen (ISA, Aarhus, Denmark)

Room: Linneasalen

ESS collimator requirements: Sensitive components and activation

• Thomas Shea (ESS)

Room: Linneasalen

Beam losses and collimators at the Oak Ridge Spallation Neutron Source

• Michael Plum (ORNL/SNS)

Room: Linneasalen

Structure and Operation of the Collimator System in J-PARC 3-50BT Line

• Masashi Shirakata (KEK)

Room: Linneasalen

Transport of the 1.4 MW Beam at the PSI Proton Accelerator

• Davide Reggiani (PSI)

Room: Linneasalen

Design and performance of the copper collimator KHE2 in the 590 MeV beam line at PSI

• Daniela Kiselev (PSI)

Room: Linneasalen

Collimators at FAIR

• Lars Bozyk (GSI / FAIR)

Room: Linneasalen - Overview about FAIR - Collimators in the high energy beam transport lines (current status, strategies) - Beam stopper in the high energy beam transport lines, to prevent accidential beam in areas with people access - Cryogenic Collimators in the synchrotron

Collimation design considerations at CERN

• Roderik Bruce (CERN)

Room: Linneasalen Collimation systems are installed for different purposes, and different considerations have to be made depending on the application and the machine. This talk gives an overview of some design constraints that have to be taken into account when designing collimation systems, for example for the LHC at CERN. Examples of different considerations include betatron and momentum collimation, movable versus fixed devices, multi-stage and choice of materials. Some of the simulation tools used at CERN will also be briefly mentioned, as well as techniques for monitoring beam losses.

Overview of Present and Upgraded SPS-to-LHC Collimation System

• Alessio Mereghetti (UMAN and CERN)

Room: Linneasalen The nominal operation of the LHC foresees injection of beams capable of damaging Transfer Line (TL) and LHC equipment if uncontrolled losses occur. The SPS-to-LHC TLs are thus equipped with a passive protection system: a set of collimators (TCDIs) aimed at intercepting particles with large amplitude and/or mis-steered beams. An overview of the present system is given, with particular emphasis on operational aspects and experience: accurate procedures for beam based alignment of collimators and setup validation, dedicated system of interlocks for jaw positioning and overall collimator functionality, issues encountered during operation and improvements. In view of the improved beam brightness foreseen by the LHC Injectors Upgrade (LIU) and High Luminosity LHC (HL-LHC) projects, the upgrade of the system is presently under study. Main design challenges, simulation tools and results are summarised: system layout and phase coverage including geometrical uncertainties, choice of suitable materials able to stand the head load and provide sufficient attenuation, protection of downstream devices.

Collimators: Relations to MPS

• Annika Nordt (European Spallation Source)

Room: Linneasalen

Remote handling and other technical details

• Peter Ladd Ladd (European Spallation Source)

Room: Linneasalen

ESS collimator status: fixed collimator

• Karol Szymczyk (NCBJ, Swierk)

Room: Linneasalen

ESS collimator status: Movable collimators

• Piotr Warzybok (NCBJ, Swierk)

Room: Linneasalen