Beam Losses and Collimators in Transfer Lines

13 May 2014, 08:30 → 14 May 2014, 15:00 Europe/Stockholm

Linneasalen (ESS AB)

Designs of future high-power accelerators are facing a major challenge in terms of minimizing uncontrolled primary beam losses in areas aiming at hands-on maintenance of accelerator components. At the European Spallation Source (ESS), the canonical <1 W/m loss rate corresponds to an unprecedented <200 ppb relative loss (at 5 MW). Transport sections offer the possibility of installing collimator systems to convert some of the downstream uncontrolled losses to localized controlled losses. The collimators can potentially also mask sensitive regions or components and mitigate non-nominal beam conditions. The challenges and benefits of a collimator system at beam energies of a few GeV are believed to be relevant and somewhat common to many high-power facilities.

How to get to Lund and ESS How_to_get_to_the_ESS_office4.pdf

Map of hotels in Lund and the ESS office Hotel_and_conf_map_Lund.png

Tuesday 13 May ¶

09:15 → 09:30 Taxi: StayAt -> ESS

10:00 → 10:10 Welcome: Introduction and aim of the meeting¶

Speaker: Dr Heine Thomsen (ISA, Aarhus University)

Slides 2014_05_13_intro.pptx

10:10 → 10:30 Status of the ESS Accelerator¶

Speaker: Mohammad Eshraqi (European Spallation Source ESS AB)

Slides Eshraqi_Collimation.pdf

10:30 → 10:55 The ESS HEBT Beam Physics: Collimator Opportunities & Requirements¶

Speaker: Dr Heine Thomsen (ISA, Aarhus, Denmark)

Slides 2014_05_13_hdt.pptx

10:55 → 11:20 ESS collimator requirements: Sensitive components and activation¶

Speaker: Thomas Shea (ESS)

Slides 2014-05-13_loss_and_collimation_workshop_shea_pitcher_r1.pptx

11:20 → 11:30 Open discussion¶

11:30 → 12:00 Beam losses and collimators at the Oak Ridge Spallation Neutron Source¶

Speaker: Dr Michael Plum (ORNL/SNS)

Slides ESS_wkshp_on_beam_losses_and_coll_May_2014_r1.pptx

12:00 → 12:30 Structure and Operation of the Collimator System in J-PARC 3-50BT Line¶

Speaker: Dr Masashi Shirakata (KEK)

Slides btcollimator_20140513.pptx

12:30 → 13:30 Lunch

13:30 → 14:00 Transport of the 1.4 MW Beam at the PSI Proton Accelerator¶

Speaker: Dr Davide Reggiani (PSI)

Slides talk.ppt

14:00 → 14:30 Design and performance of the copper collimator KHE2 in the 590 MeV beam line at PSI¶

Speaker: Dr Daniela Kiselev (PSI)

Slides colli_ESS_daniela_kiselev.pptx

14:30 → 15:00 Collimators at FAIR¶

- 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

Speaker: Lars Bozyk (GSI / FAIR)

Slides Collimators_at_FAIR_2.ppt

15:00 → 15:30 Coffee break

15:30 → 16:00 Collimation design considerations at CERN¶

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.

Speaker: Dr Roderik Bruce (CERN)

Diapositivas 2014.05.13--ESS_workshop_beam_losses_collimation.pptx

16:00 → 16:30 Overview of Present and Upgraded SPS-to-LHC Collimation System¶

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.

Speaker: Mr Alessio Mereghetti (UMAN and CERN)

Slides 2014-05-13_EssWshop_AM.pptx

16:30 → 17:00 Open discussion¶

17:15 → 17:30 Taxi: ESS -> StayAt

19:00 → 21:00 Dinner

Sankt Petri kyrkogata 9

Wednesday 14 May ¶

08:15 → 08:30 Taxi: StayAt -> ESS

08:45 → 09:15 Collimators: Relations to MPS¶

Speaker: Dr Annika Nordt (European Spallation Source)

Slides ANordt-MPS-CollimationWS2014ESS-v01.pdf

09:15 → 09:30 Remote handling and other technical details¶

Speaker: Peter Ladd Ladd (European Spallation Source)

Slides Beam_Losses_and_Collimator_Worrkshop.pptx

09:30 → 10:00 Coffe break

10:00 → 10:30 ESS collimator status: fixed collimator¶

Speaker: Karol Szymczyk (NCBJ, Swierk)

Slides K.Szymczyk_Fixed_Collimators_in_Ess.pdf

10:30 → 11:00 ESS collimator status: Movable collimators¶

Speaker: Piotr Warzybok (NCBJ, Swierk)

Slides P.Warzybok_Lund_14.05.pdf

11:00 → 12:00 Open discussion¶

12:00 → 13:00 Lunch + departure for CPH

13:15 → 13:30 Taxi: ESS -> Lund Central Station