International Review on the e-lens concept readiness for integration into the HL-LHC baseline

Europe/Zurich
6/2-024 - BE Auditorium Meyrin (CERN)

6/2-024 - BE Auditorium Meyrin

CERN

120
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Description

The charge of the review is to see if CERN has all information at hand to estimate the individual cost items for the hollow e-lens and to prepare a tentative production schedule (including potentially required prototype developments and R&D milestones) for implementing the e-lenses during LS3 and to assure sufficient space and infrastructure in the designated areas for the installation of the hollow e-lenses during LS3.

To this end, we would like to review in particular the following points:

a) Is CERN ready for estimating the total cost and resource requirements for the e-lenses (including the technical development)?

b) Is CERN ready to specify the technical infrastructure needs in IR4 to avoid future iterations on key services at a later stage (e.g. cryogenic)?

c) Is CERN ready for reserving sufficient space for the e-lenses in IR4? [this point was explicitly removed from the charge of the last review on the needs for a hollow e-lens]

d) Have all the implied technical groups identified the required resources for implementing the e-lens development (including the required technical development for finalising the technical design by the end of LS2) and integration (for the e-lenses installation in LS3 and operational exploitation as of the start of Run4)? This point clearly should match the identified resource requirements of point 1) and should include a comparison with the currently existing resources.

e) Is CERN ready for identifying which components of the e-lenses need to be produced in-house and which components could be outsourced?

The review will take place at over two days, on 19th and 20th October, at CERN. The members of the International Review Panel are: Wolfram Fisher (BNL - Chair), Francesco Bertinelli (CERN), Akira Yamamoto (KEK-CERN), Rudiger Schmidt (CERN), Paul Cruikshank (CERN), Laurent Tavian (CERN).

Oliver Brüning is the link person for this review.

The link to the previous review can be found by clicking here, and reference material related to the Hollow Electron Lens can be found on this page.

Participants
  • Adriana Rossi
  • Carlo Zanoni
  • Cristina Adorisio
  • Daniele Mirarchi
  • Diego Perini
  • Federico Carra
  • Gianluigi Arduini
  • Giovanni Iadarola
  • Giulio Stancari
  • Joschka Wagner
  • laurent Tavian
  • Lucio Rossi
  • Michele Martino
  • Oliver Bruning
  • paul cruikshank
  • Rhodri Jones
  • Roberto Corsini
  • Wolfram Fischer
  • Yannis Papaphilippou
  • Thursday, 19 October
    • 08:30 12:30
      Status of design 6/2-024 - BE Auditorium Meyrin

      6/2-024 - BE Auditorium Meyrin

      CERN

      120
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      • 08:30
        Introduction and recapitulation from the last review (2016) 10m
        Speaker: Oliver Bruning (CERN)
      • 08:40
        Q&A 5m
      • 08:45
        Functional specifications and parameter requirements 25m

        The present target specifications for the LHC electron lenses for enhanced beam collimation are reviewed. After a brief presentation of the basic working principle of hollow e-lenses, which illustrates how they will be used to improve the beam collimation through an active control of beam tails, the key parameters defined in the conceptual design report are presented. Uncertainties on these parameters are discussed and the table of parameter set used for the present technical design are given. The status of ongoing studies on different powering schemes for the e-beam, and of their effects on beam halos and core, are also reviewed.

        Speaker: Stefano Redaelli (CERN)
      • 09:10
        Q&A 5m
      • 09:15
        Summary of reference design(s) [FNAL and RHIC designs] and CERN reference baseline overview 25m

        This presentation will describe the hardware of the Hollow Electron Lenses for HL-LHC.
        In the first part the main design choices and the differences with respect to other existing HELs will be explained.
        In the second part the most important components: magnetic system, cryostats, feeding systems, gun, collector, and support structures will be shortly described.

        Speaker: Diego Perini (CERN)
      • 09:40
        Q&A 5m
      • 09:45
        Electron-lens experience at Tevatron and RHIC 25m

        The design and operational aspects of the Tevatron and RHIC electron lenses are reviewed, with comments on diagnostics, reliability, maintenance and infrastucture.

        Speaker: Giulio Stancari (Fermilab)
      • 10:10
        Q&A 5m
      • 10:15
        Group picture + Coffee break 15m
      • 10:30
        Layout and integration boundary conditions in IR4 25m

        This talk will provide a general overview of how the Hollow Electron lenses and its ancillaries will be integrated in the LHC tunnel, point 4. In particular the position of the HEL on the beam respect to the nearby components, the possible location of the control power and protection systems and the correlated connection will be discussed. The requirements for the HEL, coming from alignment of the nearby machine components, will be also shown.

        Speaker: Maria Amparo Gonzalez De La Aleja Cabana (Universidad Politecnica de Madrid (ES))
      • 10:55
        Q&A 5m
      • 11:00
        Existing technical infrastructure boundaries (cryogenics) 10m

        Presentation of LHC Cryogenics at P4, cooling interfaces available for users, timeline for any new project to be considered including HEL.

        Speaker: Serge Claudet (CERN)
      • 11:10
        Q&A 5m
      • 11:15
        Additional ancillaries for the operation of the HEL 10m

        This talk will describe the basic operations with the Hollow Electron Lens, and its ancillaries will be integrated in the LHC tunnel, point 4. In particular the electronics, power converters, interlocks.

        Speaker: Adriana Rossi (CERN)
      • 11:25
        Q&A 5m
      • 11:30
        Proposed beam instrumentation for the hollow electron lens 25m

        This talk will focus on the beam instrumentation requirements for control of the hollow electron beam and its accurate alignment with the proton beam.
        A set of proposed diagnostic systems to meet these requirements will be presented, taking as input previous experience from similar electron lenses at both FNAL and BNL. This includes beam position monitors, beam current monitors, a novel beam luminescence profile monitor using a supersonic gas curtain and use of a backscattered electron detector as overlap monitor.

        Speaker: Rhodri Jones (CERN)
      • 11:55
        Q&A 5m
      • 12:00
        Operational aspects and machine protection considerations (benign devices can be made transparent and turned off, ...) 25m
        Speaker: Roderik Bruce (CERN)
      • 12:25
        Q&A 5m
    • 12:30 14:10
      Lunch break 1h 40m 6/2-024 - BE Auditorium Meyrin

      6/2-024 - BE Auditorium Meyrin

      CERN

      120
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    • 14:10 18:30
      Technical development and R&D plans 6/2-024 - BE Auditorium Meyrin

      6/2-024 - BE Auditorium Meyrin

      CERN

      120
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      • 14:10
        Safety aspects in IR4 (access constraints for operating the e-beam complex) 15m

        This presentation will address the safety-related aspects of the HEL during commissioning and operations based on the present design. Both conventional and radiation hazards will be covered. The possible risk control measures to implement during design, commissioning and operations will be presented.

        Speaker: Christelle Gaignant (CERN)
      • 14:25
        Q&A 5m
      • 14:30
        Simulation studies for the e-dynamics and discussion on the range of interesting e-currents (4-5A) and solenoid fields (4-6T), summary of BINP studies and range of required parameters 25m

        This talk will present simulations (from BINP) on electron beam transport showing the interplay between electron current, the required extraction voltage and solenoid field on electron dynamics and stability.

        Speaker: Adriana Rossi (CERN)
      • 14:55
        Q&A 5m
      • 15:00
        Beam Gas Jet monitor 15m

        The gas jet monitor is beam profile measurement diagnostic that would allow simultaneous on-line imaging of both electron and proton beams. The principles and development is described along with plans for integration and test in the LHC.

        Speaker: Raymond Veness (CERN)
      • 15:15
        Q&A 5m
      • 15:20
        Superconducting Magnet System Conceptual Design for the Hollow e-lens (HEL) proposed for HL-LHC 25m

        During the summer of 2017 a number of coil designs have be studied with the aim of finding a configuration of coils and a cryostat design that will fulfill the many requirements associated with the proposed HEL system. We can state that the final fully detailed coil configurations are yet to be reached and are still under optimization. This talk presents the latest design that covers the flexibility of the magnetic field profits, the magnet protection possibilities for the main solenoids, dipole and quadrupole circuits. We present the initial quench protection calculations. Finally we comment on the possible costs of such a Cryo-Magnet system as a result of a number of budgetary offers.

        Speaker: Glyn Kirby (CERN)
      • 15:45
        Q&A 5m
      • 15:50
        Coffee break 30m
      • 16:20
        Injector and dump design details and developments 15m

        The hollow electron beam is injected by a cathode immersed in the magnetic field generated by a set of solenoids. The sum of these components is called electron gun and its geometry evolved over time in order to guarantee sufficient performance in terms of electron density, hollow beam dimensions and gun compactness.
        The energy carried by the electrons is dissipated in a dump system in charge of receiving up to 50 kW (conservative value) of power and transfer them to a water cooling system. Feasibility studies of the dump have been performed in order to identify a proper design philosophy and highlight the critical aspects.

        Speaker: Giorgia Gobbi (CERN)
      • 16:35
        Q&A 5m
      • 16:40
        List of ongoing studies and topics for a potential test facility and expected benefits for the reference design. 25m

        This talk will illustrate tests to be carried out in an electron lens test facility, aimed at validating simulations and size effects of bends, compression, imperfections, misalignment, . . .
        A staged approach is proposed, starting with a test-stand with all resistive solenoid magnets that will allow to complement ongoing tests characterizing e-guns with higher extraction energy, while gaining experience and expertise, measure the effect of misalignment, test instrumentation, interlocks, electronics (modulators), . . . A second stage will include a bend, possibly with SC magnets, that could come as prototype to check the production quality, or spares, and will permit to complete the studies on e-beam dynamics.

        Speaker: Adriana Rossi (CERN)
      • 17:05
        Q&A 5m
      • 17:10
        Planning, budget and schedule proposal for reference design, Discussion on required spares and maintenance scenarios 25m

        The figures from the different presentations to this review are wrapped up in a summary that collects budget and planning implications for the deployment of 2 hollow electron lenses at HL-LHC, for the operation in Run IV. Various scenarios are considered taking also into account the procurement needs for prototypes and spares. Open points and possible sources of uncertainties are also discussed.

        Speaker: Stefano Redaelli (CERN)
      • 17:35
        Q&A 15m
    • 19:30 22:00
      Dinner - by invitation 2h 30m 6/2-024 - BE Auditorium Meyrin

      6/2-024 - BE Auditorium Meyrin

      CERN

      120
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  • Friday, 20 October
    • 09:00 14:00
      Panel closed session 6/2-008

      6/2-008

      CERN

      15
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      • 10:00
        Discussions 2h 30m
        Speakers: Adriana Rossi (CERN), Oliver Bruning (CERN), Stefano Redaelli (CERN)
      • 12:30
        Lunch break 1h 30m
    • 14:00 15:00
      Close out 6/2-024 - BE Auditorium Meyrin

      6/2-024 - BE Auditorium Meyrin

      CERN

      120
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