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 LHC Collimation Project

Home of the Project for the LHC Collimation System

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MP Tests Sounds 2011 Lossmaps Tracking Code LS1 activities ColUMM
SLAC collimation 2014 Commissioning LS2 activities

Automatic retraction of collimator jaws after power cut on the step motors. The gap opens from 1 mm to 60 mm! The RF contacts ensure the electrical conducitivity from the beam pipe to the Carbon-Carbon jaw!

Finalize the design of the LHC collimation system in IR3 and IR7, taking into account all relevant requirements concerning robustness, performance, fabrication, installation, maintenance, machine protection, and beam operation. Produce prototype collimator tanks for TCP, TCS, and TCL type collimators and verify their performance. Supervise production and installation of the full system. Commission the system without and with beam. Support routine operation.
Why LHC collimation? Click for a short introduction!

    Tunnel movies: click here!

2013 Collimation Review   2015 Tracking Workshop  

2013 Collimation Review


2015 Tracking Workshop


More photographs click here

Layout sketches
Schematic view for qualitative purposes. Save JPEG file to disk and open!

Movie of IR7 layout

Autodesk DWF file IR3 Autodesk DWF file IR7

NEWS February 2019 International Review of the WP5 : https://indico.cern.ch/event/780182 ; Review panel's report available at this link.

April 2016 The collimation system is commissioned for the 2016 LHC operation at a betastar of 40 cm, with the gaps at the primary collimators as small as 2.1 mm and a cleaning inefficiency of 3e-4.

October 2015 A particle tracking workshop was held on the 30th October to review the status of the different tools for collimation studies, as well as results of benchmarking of simulations against measurements. Indico link here.

May 2015 The collimation system has been commissioned for the full machine cycle. The settings calculated from the alignments at each stage have been verified via beam loss maps.

February 2015 LHC Collimation MD requests for Run II have been prepared.

See details here.

July 2014 All collimators for LHC Run II have been installed.

January 2014 The first two TCTPs, Collimators with embedded BPMs from the final series production arrived to CERN. See pictures.

December 2013 The CERN production of 3 Secondary collimators with embedded BPMs (TCSP) is finished.

November 2013 Arrival of SLAC rotatable Collimator.

May 2013 LHC Collimation Review 2013 to advise on the present upgrade baseline and in particular the need to pursue R&D on 11T dipoles for possible installation in the LHC for LS2. Find the comments and recommendations from the reviewers at the link.

March 2013 Find the most recent results in collimation at IPAC'13. and the pre-press proceedings.

March 2013 Machine Protection Workshop, 11-13 March, Annecy. Discussion of mid- and longer-term improvements of the MP systems.

February 2013 Collimator Quench Test. Achieved up to 1.05MW of peak power loss during the test within 5-10seconds, no quench was recorded. Measured quench limit for collimator losses rised by a factor of 2.

January 2013 Successful cleaning with tight collimator setting during the 2013 p-Pb run at 4TeV. Find the most relevant loss maps at Loss maps web page.

December 2012 Summary of Collimation system performance at Evian 2012 (talk and paper). Excellent cleaning performance in 2012 using Tight Collimator Settings with gaps as small as few mm. The year closed with NO quenches with circulating beams and up to 140 MJ at 4TeV stored energies.

March 2012 Start of 2012 proton runs at 4TeV and 130MJ stored energy per beam with Tight Collimator settings

June 2011 LHC 2011 External Collimation review.

March 2010

December 2009

November 2009

June 2009

April 2009

March 2009

January 2009


December 2008

October 2008

September 2008


June 2008

April 2008

Starting for beam commissioning up to 3.5 TeV and 32 MJ stored energy!
New Machine Protection test and result page is put up.

SixTrack Simulations for 3.5TeV

The full phase 1 collimation system (4 stage cleaning & protection) is set up for beam cleaning at 450 GeV. Efficiency reaches up to 99.99% with stored beam! Used through injection, ramp and 1.18 TeV!

CERN news June 24: The LHC collimator project completes phase 1
Celebration June 23: Group picture -
Pictures last installation - Pictures drink
Link: EuCARD/Colmat kick-off meeting

Link: Conceptual Design Review for Phase II of LHC Collimation

Download: Ralph's "Cassandra" talk on intensity limits in LHC

Presentation of a conceptual solution for HiRadMat Test Facility
Start update work on code documentation web site.
Download: Draft ECR on 2009 collimator installation
Download: PhD thesis C. Bracco: "Commissioning Scenarios and Tests for the LHC Collimation system"

Start completing the installation of the collimation "phase I" system (movies)

Reproducibility run of IR7 collimators achieves < 30 micrometer accuray

Collimator events with LHC beam (CMSa, CMSb, ATLASa, ATLASb)

Download: Kurchatov report on radiation-resistance of phase I collimators

Installation of the 2008 collimation system completed

Download: ECO "Collimator Installation for First 7 TeV Run" (WORD)

Seminar (GSI/FNAL): Beam Loss and Collimation at LHC (Aug:  SLAC)

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TCTP design Meetings
BE-ABP indico agenda

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      CONTACT Project Team The Project Team web site lists all members, grouped by the different aspects of the project.

Comments and suggestions to: Stefano Redaelli (CERN)

  Last updated Monday, 11th November 2013 19:39 +0200