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Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004 Ion Programme of LHC Hans-H.

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Presentation on theme: "Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004 Ion Programme of LHC Hans-H."— Presentation transcript:

1 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004 Ion Programme of LHC Hans-H. Braun  I-LHC layout and planning  Limitations on LHC ion beams  Other projects for e - -ion collider

2 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004 LHC: Layout Beam dumps Acceleration system Beam cleaning Proton or Ions injection Pb-Pb p-p (Pb-Pb) p-p (Pb-Pb?) Beam cleaning

3 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004 The LHC Injector Chain - Overview LEIR 72 MeV/n Pb 6 GeV/n Pb 177 GeV/n Pb 2.76 TeV/n Pb-Pb LEIR 72 MeV/n

4 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004

5 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004

6 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004 I-LHC (Ions for LHC) vs. ALICE Planning ALICE (CMS, + ATLAS?) Planning  Running-in detector in 2007 with p-p, followed by p-p physics run  Year 1 : Pb-Pb pilot run “at the end of first p-p run”, normally in April 2008, ~1 week, L a few 10 25 cm -2 s -1 (corresponds to “Early Scheme”)  Years 2 (2009?) and 4: Pb-Pb @ L ~ 10 27 cm -2 s -1 (Nominal Pb beam) for rare observables  Year 3: p-Pb @ L ~ 10 29 cm -2 s -1 for nuclear modifications of structure functions  Year 5 (2012?): Ar-Ar @ L ~ 10 27 - 10 29 cm -2 s -1 for energy density dependence I-LHC Planning  Deal exclusively with Pb ions  “Early Pb Scheme” – much easier to achieve – for 2008 (and 2009?)  Nominal Pb Scheme by 2009 (2010?)  Other ion-ion collisions (typically In, Kr, Ar, O) by ~2012  improvement programme albeit without major hardware changes

7 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004 Some remarks about ion beams in LHC I-LHC beam emittances are chosen to give for the same magnetic field strength of the ring magnets the same beam sizes as for protons beams The beam energy per nucleon for ions are lower by a factor Z/A compared with protons. The separated RF systems for the two rings allow to have different ions species in the two rings (problems with instabilities due to parasitic crossings as observed in RHIC need further studies). Presently the injector machines foresee only the acceleration of 208 Pb ions. Other ions are certainly possible with moderate upgrades of injector. But very little studies have been done so far. Presently other ion species are not part of the LHC baseline program.

8 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004 Intensity limitations for Ion beams in LHC Single bunch intensity Intra Beam Scattering  Growth ~ Z 2 /A 3 ~ N B /A balanced by Synchrotron radiation  Damping ~ A 4 /Z 5 ~ 1/Z Space charge limit in injector chain  Q SC ~ N B Z 2 /A Intra Beam Scattering limits in injector chain Total beam current Residual gas scattering  ~A 2/3 Particle loss induced gas desorption from vacuum chamber walls can lead to vacuum run-away Particle losses in IP’s proportional to Luminosity Total beam intensity is limited by permissible loss rate given by T·N B ·n /  This loss rate is given by the power the collimation system can handle and the collimation efficiency, i.e. the fraction of particles lost on the S.C.-magnets relative to the losses on the collimators. Collimation efficiency for ions is considerably worse than for protons, because of the different interaction mechanism of the ions in the collimators.

9 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004 SPS Bunchlets – Yes or No?  Injection plateau lasting 43.2 s at 57.1 Tm, accumulating up to 13 PS batches à 4 bunches (4 pairs of bunchlets) each. Very little transverse blow-up/losses allowed  Pb ions suffer from incoherent space charge detuning and Intra-Beam Scattering (IBS) Halving the number of ions/bunch (= making bunchlet pairs) halves these effects as well.  Bunchlet pairs can be recombined by a 100 RF system before extraction to the LHC  Space charge detuning  Q (about the same in either plane) for nominal Pb ion bunches: - 0.082 calculated - P-Pbar experience: SPS can stand not more than  Q = 0.07. - Recent measurements (with p):  Q up to 0.18 acceptable on the injection plateau  IBS growth times (nominal bunches): ~300 s (to be confirmed) which is acceptable   Q and IBS the same for Nominal and Early schemes (bunch properties identical)  No bunchlets in the early scheme (“calculated risk”)  No installation of 100 MHz RF systems now (intended to check their impact on p beams)

10 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004

11 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004

12 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004

13 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004

14 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004 Preliminary study for other ions than 208 Pb has been done in LHC project report 450, “Review of the LHC ion program,” Daniel Brandt, 2000

15 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004

16 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004

17 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004

18 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004

19 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004

20 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004

21 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004

22 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004 GSI / FAIR project

23 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004

24 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004 Informations on LHC ion program http://ab-div.web.cern.ch/ab-div/Conferences/Chamonix/2004/default.html http://ab-div.web.cern.ch/ab-div/Publications/LHC-DesignReport.html Slides and references for FAIR, eRHIC and e-LIC http://nsac2004.bnl.gov/ Overview-Electron Ion CollisionsOverview-Electron Ion Collisions Raju Venugopalan Realization at e-RHICRealization at e-RHICRichard Milner Realization at e-LICRealization at e-LICRolf Ent HI Physics Opportunity at GSIHI Physics Opportunity at GSIBengt Friman HI Physics and Experiments HI Physics and Experiments Peter Braun-Munzinger http://www-new.gsi.de/GSI-Future/cdr/PDF/S3.pdf A. Koop et. al., Conceptual Design of an Electron-Nucleus Scattering Facility at GSI, Final Report, BINP 2001. http://www.agsrhichome.bnl.gov/eRHIC/

25 Ion Programme of LHC Hans-H. Braun Miniworkshop on Machine and Physics Aspects of CLIC based future Collider Option, 30.8.2004 Thanks to John Jowett and Karlheinz Schindl for providing slides, information and helpful discussions for this presentation

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