LIU Beam Studies Review

Tuesday 28 Aug 2012, 08:30 → 18:30 Europe/Zurich

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

Giovanni Rumolo (CERN)

The main goal is to review the status of beam studies in the injectors and to define work priorities before LS1 in view of being able to:
- specify the equipment to be built for LIU,
- estimate achievable beam characteristics in the successive accelerators.

Chairman
Giovanni Rumolo

Scientific secretaries:
PSB: Vivien Raginel
PS: Alexander Huschauer and Sandra Aumon
SPS: Wolfgang Bartmann and Helga Timko

External reviewers: Giuliano Franchetti (GSI), Dobrin Kaltchev (TRIUMF) and Alexey Burov (FNAL, currently at CERN)

Instructions for the speakers: The 20' talks are meant to be 15' (talk) + 5' (questions + discussion) and the 30' talks are meant to be 20' (talk) + 10' (questions + discussion).

Outcome: a summary report with a list of key items for study will be prepared by Giovanni Rumolo with the input of the scientific secretaries and the report from the external referees.

The organizers are pleased to invite you to the workshop lunch in Restaurant no.1 from 12.30 to 14.00. Please fill in the registration form to confirm your participation.

LIUBeamStudiesReview-v6.pdf

Report of the MD review in CDS

1 Welcome and introduction

Goals of mid-run review

Speaker: Roland Garoby (CERN)

Slides LIU_Beam_Studies_Review2012_Garoby.pdf LIU_Beam_Studies_Review2012_Garoby.pptx

2 Setting the scene

• LHC expectations and injectors’ potential performance after LIU • LIU MD activities: initial goals, where we are standing, which additional MDs do we need? Which additional hardware would help (instrumentation, RF, damper…)?

Speaker: Giovanni Rumolo (CERN)

Slides LIUBeamStudies-GR.pdf LIUBeamStudies-GR.pptx

PSB

Convener: Vivien Raginel (CERN)

3 Performance reach of LHC beams

• From the PSB with different PS schemes • Preservation of emittances along the chain: importance of transverse damper? • PSB with Linac4 in case of Linac2 failure: do we need PSB MDs?

Speakers: Ana Guerrero Ollacarizqueta (CERN), Dr Bettina Mikulec (CERN)

Slides LIU_MD_Day_Aug2012_BM.pdf LIU_MD_Day_Aug2012_BM.pptx

4 Space charge studies at 160 MeV in the PSB

• Which brightness can we expect? • Impact of painting scheme? • Spotted resonances that need compensating? Which tools do we need to optimize the compensation (instrumentation, multipoles)?

Speakers: Alexander Molodozhentsev (High Energy Accelerator Research Organization (JP)), Christian Carli (CERN), Elena Benedetto (CERN), Frank Schmidt (CERN), Michel Martini (CERN), Vincenzo Forte

Slides LIU-0828-PSB160.pdf

5 RF & transverse feedback aspects

• What else do we need to know to definitively adopt Finemet cavities? When the decision can be made? • What is left to demonstrate with the digital LLRF (e.g. synchronization before transfer, different intensity ranges, test more than one ring)? • Are RF by-passes an issue? • Can some of the new hardware for the transverse damper tested this year?

Speakers: Alan James Findlay (CERN), Alfred Blas (CERN), Maria Elena Angoletta (CERN), Mauro Paoluzzi (CERN)

Slides LIU_RF_&_Transverse_Feedback_Aspects_28th_August_2012.pptx

10:10 Coffee break

PS

Conveners: Alexander Huschauer (CERN), Sandra Aumon (Ecole Polytechnique Federale de Lausanne (CH))

6 Space charge studies and impact on performance

• Is a higher brightness/Q achievable at 1.4 GeV? Perspective at 2 GeV? • Are the tunes enough optimized? Potential of further progress? Need for resonances compensation? • Importance of transverse damper?

Speakers: Alexander Huschauer (Vienna University of Technology (AT)), Frank Schmidt (CERN), Giuliano Franchetti (Gesellschaft fuer Schwerionenforschung mbH (GSI)), Raymond Wasef (Institut National Polytechnique de Grenoble (FR))

Slides LIU_Presentaton_28-08-12.pdf LIU_Presentaton_28-08-12.pptx

7 Longitudinal plane

• Stability & feedback: what else do we need to know to specify hardware (damper, cavities feedbacks…)? • Impedance measurements: Impact of future additional devices (kickers, cavities, damper…)? Are RF by-passes an issue? • Alternative production schemes • Can we set scenarios to reasonably estimate performance after LS1?

Speakers: Heiko Damerau (CERN), Mauro Migliorati (Universita e INFN, Roma I (IT)), Steven Hancock (CERN)

Slides LongitudinalPlaneBeamStudiesLIUReview_v4.pdf LongitudinalPlaneBeamStudiesLIUReview_v4.pptx

8 Transverse plane

• Stability & feedback: what else do we need to know to specify hardware (damper, kickers, correctors, e-cloud mitigation…)? • Sources of losses, emittance growth and instability • Impedance measurements (global and local)

Speakers: Alfred Blas (CERN), Giovanni Iadarola (Universita e INFN (IT)), Giovanni Rumolo (CERN), Guido Sterbini (CERN), Dr Mauro Pivi (SLAC), Nicolo Biancacci (Universita e INFN, Roma I (IT)), Sandra Aumon (Ecole Polytechnique Federale de Lausanne (CH)), Serena Persichelli (Universita e INFN, Roma I (IT)), Dr Simone Gilardoni (CERN), Vladimir Kornilov (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))

Slides Transv_LIU-rev_PS-MD-Simo-v5.pdf Transv_LIU-rev_PS-MD-Simo-v5.pptx

PS-SPS

Conveners: Alexander Huschauer (Vienna University of Technology (AT)), Wolfgang Bartmann (CERN)

9 PS-SPS transfer studies

• How much can we gain? • With Q20? • What else do we need to know to decide upon additional RF hardware?

Speakers: Heiko Damerau (CERN), Helga Timko (CERN), Steven Hancock (CERN)

Slides LIU-Event_20120828_TH.pdf LIU-Event_20120828_TH.pptx

12:20 Lunch @Restaurant 1

SPS

Conveners: Helga Timko (CERN), Wolfgang Bartmann (CERN)

10 Performance and reach of Q20 optics (wrt Q26)

• Single bunch (space charge and TMCI) & Multi-bunch operation: are the tunes enough optimized? Potential of further progress? Do we understand the present limits? Would it help to test with a better LLRF at 800 MHz? • Deployment of extraction to LHC: what is left to understand?

Speakers: Eliana Gianfelice (Fermi National Accelerator Lab. (US)), Glenn Vanbavinckhove (NIKHEF (NL)), Hannes Bartosik (Physics Division), RF team, Yannis Papaphilippou (CERN)

Slides 2012.08.28_LIUday_Q20_HBartosik.pdf 2012.08.28_LIUday_Q20_HBartosik.pptx

11 Electron cloud status @ SPS in 2012

• Observations (beam, pressure) • ECM studies for scrubbing and modeling: what is left to understand? • Progress on a-C coating: what is left to demonstrate? What are the questions?

Speakers: Fritz Caspers (CERN), Giovanni Iadarola (Universita e INFN (IT)), Giovanni Rumolo (CERN), Hannes Bartosik (Physics Division), Holger Neupert (CERN), Mauro Taborelli (CERN), Michael Rolf Holz (Hochschule Karlsruhe, Technik und Wirtschaft), Silke Federmann (University of Vienna (AT))

Slides 20120828_LIU_MD_review_iadarola.pdf 20120828_LIU_MD_review_iadarola.pptx

12 Longitudinal stability in the SPS: RF studies

• Requirements for the 800 MHz system • Known instabilities and thresholds • What else do we need to know to estimate performance after LIU?

Speakers: Elena Chapochnikova (CERN), Juan Federico Esteban Muller, Theodoros Argyropoulos (National Technical Univ. of Athens (GR)), Thomas Bohl (CERN)

Slides LIUBeamStudiesReview_SPSLongStability_New.pdf LIUBeamStudiesReview_SPSLongStability_New.ppt

15:30 Coffee break

SPS

Conveners: Helga Timko (CERN), Wolfgang Bartmann (CERN)

13 High Bandwidth Feedback system

• Which tests can be done before LS1? On which hardware does this depend? • Can we envisage extending it to PS/LHC?

Speakers: John D Fox (SLAC National Accelerator Laboratory (US)), John Michael Cesaratto (SLAC National Accelerator Laboratory (US)), Kevin Shing Bruce Li (Eidgenoessische Tech. Hochschule Zuerich (CH)), Wolfgang Hofle (CERN)

Slides High_Bandwidth_damper.pdf High_Bandwidth_damper.pptx

14 Summary (collective)

• Key pending questions • Which ones can be addressed before the end of the run? • What is required (MD time, machine conditions, equipment…)?

Slides

• LIUBeamStudiesReview_PSBsession.pdf
• LIUBeamStudiesReview_PSBsession.pptx
• LIUBeamStudiesReview_PSsession.pdf
• LIUBeamStudiesReview_PSsession.pptx
• LIUBeamStudiesReview_SPSsession.pdf
• LIUBeamStudiesReview_SPSsession.pptx