Ruggiero, F

Scandale, Walter

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EU contract number RII3-CT-2003-506395 CARE Report-04-007-HHH     High Energy  High Intensity  Hadron Beams     SECOND QUARTERLY REPORT OF THE HHH COLLABORATION  F. Ruggiero & W. Scandale (CERN) Work supported by the European Community-Research Infrastructure Activity under the FP6 “Structuring the European Research Area” programme (CARE, contract number RII3-CT-2003-506395).  CARE-HHH Network: Second quarterly report 2004 F. Ruggiero and W. Scandale, 11 August 2004   In agreement with the CARE coordinator, Roy Aleksan, the name of the CARE-N3 Network on High Energy High Intensity Hadron Beams, earlier referred to as HEHIHB, has been officially changed into CARE-HHH. Several initiatives have been launched or followed-up from the previous reference period and there are new results for each of the three work-packages as well as for the overall Network organization.  Overall CARE-HHH Network organization coordinators  F. Ruggiero (CERN) and W. Scandale (CERN) goal/keywords: superior High-Energy High-Intensity Hadron Beam facilities for Europe,                          establish a roadmap for future accelerator R&D and experimental studies,                          coordinate and document international collaboration,                          upgrade of European accelerator infrastructure (LHC and GSI complex),                          LHC luminosity and energy upgrade. A CARE-HHH Network web site has been set-up at CERN with the help of a summer student (Amelia Schultheis): see http://care-hhh.web.cern.ch/care-hhh/.  Second progress report about the CARE-HHH Networking Activity by W. Scandale on 24 June 2004 at the CARE Steering Committee meeting in Warsaw. Role and importance of CARE and of the LHC Upgrade explicitly recognized by the CERN Director General.  Intense contacts with INFN to define the needs of High Intensity physics experiments in view of an upgraded version of the LHC complex and contribution to the organization of the High Intensity Frontier Workshop (HIF04), Isola d'Elba, Italy, 5–8 June 2004 (see http://www.pi.infn.it/pm/2004/). Presentation by W. Scandale on LHC luminosity improvement and CERN accelerator complex, including a possible upgrade of the LHC injector chain, from a PS Super-Booster to a Super-PS and a Super-SPS. Discussions with the CERN management for the organization of a structured working group aimed at the improvement of the LHC accelerator complex; written proposal in preparation.  A steering group chaired by Stefan Tapprogge has been set up by Peter Jenny in ATLAS for R&D on a detector upgrade. Further discussions on super-bunches, event pile-up in the detectors, longitudinal bunch profile and extent of the luminous region in view of an LHC upgrade. F. Ruggiero will make a presentation on LHC upgrade scenarios at an ATLAS meeting in September 2004.  Active contribution to the US-LARP collaboration steering by the introduction of “task sheets” describing agreed milestones and deliverables. Video-conference meeting on 1st July 2004 of the US-CERN Committee for the LARP (see H. Schmickler’s presentation at http://www-td.fnal.gov/LHC/USLARP/USLARP_20040701/LARP_Jul_04.html). WP1: Advancements in accelerator magnet technologies (AMT) coordinators L. Rossi (CERN) and L. Bottura (CERN) keywords:   stability and quench limit of LHC insertion magnets,           pulsed magnets for LHC and GSI accelerator complex upgrade,                     magnets for booster ring,                      high field magnet design,                     optimisation of the overall cost.  Preparation of the proceedings for the WAMS2004 workshop on Accelerator Magnet Superconductors, held on 22-24 March at Archamps (France), that will be edited and refereed by L. Bottura and T. Taylor, and will be published as a CERN and CARE report.  Publication of an EPAC04 paper in collaboration with APD on Performance Limits and IR Design of a Possible LHC Luminosity Upgrade Based on Nb-Ti SC Magnet Technology, by F. Ruggiero, O. Brüning, R. Ostojic, L. Rossi, W. Scandale, and T. Taylor, CERN, and A. Devred, CEA-Saclay and CERN.  Although several aspects related to the energy deposition by particle collision debris and to the thermal modelling of the IR magnets remain to be further investigated, an upgrade of the low-β quadrupoles based on classical NbTi technology may be compatible with β=0.25 m for a baseline ‘large bore’ triplet configuration with individual quadrupoles of optimized length and aperture. This is a possible option for the first phase of an LHC luminosity upgrade or for an intermediate phase, should the need for reducing β be felt earlier than it is possible to complete the Nb3Sn magnet R&D.  Intense contacts and discussions of L. Rossi and collaborators with US colleagues about: - limits/constraints on power deposition and modelling limits - critical review of previous work on cryo-magnets at LASA, Saclay/CERN, and Fermilab - active contribution to US-LARP collaboration steering: o support for a SBIR project on Nb-Ti-Ta, now approved by DOE and  attributed to University of Ohio (50 k$ for 2004 with a possible extension of 200 k$ in 2005), o steering of magnet research program (task sheets):  - more emphasis on quadrupoles vs dipoles,  - long magnet prototypes already in 2006. - work on pulsed magnets for LHC and GSI injectors: Dubna expert to be invited at CERN in the second half of 2004 - work on the LHC injectors chain: possible use of HERA magnets for the CERN SPS-LHC transfer lines WP2: Novel Methods for Accelerator Beam Instrumentation (ABI) coordinators H. Schmickler (CERN) and K.Wittenburg (DESY) keywords:  tools and diagnostic systems for luminosity,                    wire for beam-beam compensation,                    advanced transverse beam diagnostics,                    feedback loops for orbit, chromaticity and coupling,                    advanced beam halo diagnostics,                    remote diagnostics and maintenance of instrumentation. Organization of a workshop on Trajectory and Beam position measurements using digital techniques, Aumuehle (near Hamburg), 22-23 June. The presentations are available on the web at http://care-hhh.web.cern.ch/care-hhh/events/CARE-HHH-ABI-Aumuehle-Agenda.htm and proceedings are in preparation. The aim of this workshop was to understand specific problems of implementing new digital technologies for beam orbit and position measurements in hadron machines. The new digital methods have already been successfully implemented in various synchrotron light sources. In these applications submicron resolution and long-term stability over days, even independent of seasonal changes, are the most important design criteria. The digital solutions profit from the electron beams being fully relativistic (no change of revolution frequency) and from the very small variation of bunch intensities. Proposing similar digital technologies for hadron machines confronts the designers with several additional problems: - a large variation in bunch intensities and filling patterns, - change of harmonic numbers with beam in the machine, - varying revolution frequency, - demands for multi-bunch and multi-turn data.  The purpose of the workshop was also to bring together people with experience from digital orbit systems in Synchrotron Light sources and people who intend to implement this technology in hadron machines (GSI and CERN). During the three half-day sessions the following was done: - review of performance and design issues in light source implementation, - review of specifications for hadron machines, - attempt of technical solutions and proposal of test measurements.  The workshop had found interest in related industrial partners and those visited the workshop at their own cost. About 20 people from the following labs participated: ESRF, PSI, DESY, GSI, CERN, COSY, TU Darmstadt (plus Bergoz company and i-tech company). Proposed subjects for upcoming CARE-HHH-ABI events include - halo measurements (profiles down to 10-5), - lifetime (100 h within 1 sec), - (PLL) tune tracking, including chromaticity and coupling, - longitudinal density monitor (within 10-4), - profiles in high density beams. Active contribution to US-LARP collaboration steering on Beam Instrumentation issues. WP3: Accelerator Physics and Synchrotron Design (APD) coordinators F. Ruggiero (CERN) and F. Zimmermann (CERN) keywords:  Interaction Region design for LHC luminosity upgrade,                     optics design for booster synchrotrons,                    impedance calculations,                     structured list of intensity limits,                    electron cloud effects,                     beam measurements and advanced theoretical studies. Common initiative by F. Zimmermann (CERN) and M. Furman (LBNL), following the ECLOUD04 workshop, to revive the international and inter-lab comparison of electron-cloud simulation codes. Concrete results include i) expanding the code comparison web page at http://wwwslap.cern.ch/collective/ecloud02/ecsim/index.html, ii) publication of a joint EPAC04 paper on Review and Comparison of Simulation Codes Modelling Electron-Cloud Build Up and Instabilities, by E. Benedetto, F. Ruggiero, D. Schulte, F. Zimmermann, CERN; M. Blaskiewicz, L. Wang, BNL; G. Bellodi, RAL/ASTeC; G. Rumolo, GSI; K. Ohmi, S.-S. Win, KEK; M. Furman, LBNL; Y. Cai, M. Pivi, SLAC; V. Decyk, W. Mori, UCLA; A.F. Ghalam, T. Katsouleas, USC, and iii) further electron-cloud research within the US-LARP and ESGARD programmes, in particular the US LARP proposal includes the following passage: “Measurements, simulations and analytical work will contribute to a better understanding of the electron cloud effect. Conversely, the ongoing efforts at CERN to describe and model electron-cloud effects will benefit present and future US collider performance.”  Publication of an EPAC04 paper in collaboration with AMT on Performance limits and IR design of a possible LHC luminosity upgrade based on Nb-Ti SC magnet technology.   A CARE-HHH-APD workshop on Beam Dynamics in Future Hadron Colliders and Rapidly Cycling High-Intensity  Synchrotrons (HHH-2004) is being organized at CERN  from  8  to 11 November 2004. The scope includes beam optics and Interaction Region magnet layout, beam intensity limitations, and duty cycle limitations in connection with LHC upgrade and GSI project. The goals of the workshop are: - identify critical items for LHC luminosity improvements and for high intensity proton rings based on fast cycling SC magnets, - sketch scenarios for an upgrade of the LHC IR regions and injectors, - discuss benchmarking and common repository of simulation and design tools, - launch a critical analysis of alternative LHC upgrade scenarios, establish a list of pros and cons including beam dynamics and technology constraints, to narrow down the choice of the best scenario. 

Second Quarterly Report of the HHH Collaboration

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