LHC-CC09, 3rd LHC Crab Cavity Workshop

16 Sept 2009, 08:30 → 18 Sept 2009, 18:00 Europe/Zurich

160/1-009 (CERN)

Frank Zimmermann (AB/ABP), Jean-Pierre Koutchouk (AT/MCS), Joachim Tuckmantel (CERN), Rama Calaga (BNL), Rogelio Tomas (CERN)

Workshop Charge: 1. Down-select a crab-cavity design from the proposed concepts and advance the cryomodule design 2. Review the beam simulation results and operational procedures for prototype tests 3. Establish a strategy for a full crab crossing scheme for the phase-II upgrade of the LHC

Summary Report Summary of the Advisory Board Meeting Summary of the Workshop

Wednesday 16 September

08:30 → 10:20 Setting The Scene

08:30 Welcome & Overview

08:40 LHC Crab Crossing

Phase 2 and phase 1 as technical step, historical evolution, high luminosity with reduced risk, leveling as a key ingredient , issues addressed in the next sessions (global vs local)

Speaker: Dr Frank Zimmermann (AB/ABP)

Slides LHC_Crab_Crossing_-_Zimmermann.pdf LHC_Crab_Crossing_-_Zimmermann.pptx

09:00 View from the Experiments

Experiment upgrade plan, cost, leveling, preferences, material from 2008 workshop

Speaker: Marzio Nessi (CERN)

Slides 09-09-16-MNeCC09.pdf 09-09-16-MNeCC09.ppt

09:20 KEK-B Crab Operations & Future Plans

Experience, and progress, impedance, transparency, operation, tuning, availability with and w/o crab cavities, ramping of crab cavities with beam present, phase scans, detuning & retuning, what happens in case of a crab rf trip?, diagnostics

Speaker: Yoshihiro Funakoshi (KEK)

Slides FunakoshiCrab1.pptm

09:40 Crab Phase I & II Requirements

Validation, e.g. what do we need to prove prior to installation (outside) and during phase 1 (in situ)? Demonstration requirements?

Speaker: Oliver Bruning (CERN)

Slides LHC-CC_Validity_Requirements-Tests_.pdf LHC-CC_Validity_Requirements-Tests_.ppt

10:00 Discussion

10:20 → 10:40 Coffee Break

10:40 → 12:35 Layout & Design

10:40 Layout, Optics & Operational Scenarios

Global crab crossing layout, optics for various scenarios (3-7 TeV), beta squeeze, tunability, chromatic effects, imperfections, impact on instrumentation, crab luminosity gain

Speaker: Riccardo de Maria (BNL)

Slides workoutline(2).pdf workoutline.pdf

11:05 Miinimum test scenario: Single Crab Cavity in LHC

IR4 Crab Cavities: Collimation cleaning efficiency, impact parameters, collimator hierarchy, crab dispersion, dynamic aperture, synchro-betatron resonances

Speaker: Yipeng Sun (CERN)

Slides LHCC09-YipengSun.pdf

11:30 KEK-B Crab-Experiments for the LHC & Super KEK-B

Controlled noise experiments with KEK-B crab cavities, dependence of emittance growth and luminosity as a function of noise frequency and amplitude, LHC noise constraints based on simulations and KEK-B measurements, measurement of crab dispersion

Speaker: Rogelio Tomas (CERN)

Slides SLIDES.pdf

11:55 Crab Cavity Momentum Cleaning

New idea to use crab cavity for momentum cleaning, conditions for resonant excitation, efficiency of this cleaning efficiency

Speaker: Yipeng Sun (CERN)

Slides crab-collimation.pdf

12:10 Dicussion, Beam Dynamics

Slides DiscussionBeamDynamics2.pdf DiscussionBeamDynamics2.ppt

12:35 → 14:00 Lunch

14:00 → 16:00 Cavity Design

14:00 Impedance & Stability

Longitudinal and transverse impedance budgets; tolerance on orbit, beam loading effects

Speaker: Elena Shaposhnikova (CERN)

Slides Crab_EShap.pdf Crab_EShap.pptx

14:20 KEK R&D for LHC

Cavity-coupler designs, RF characteristics, HOM damping, coupler configurations, mechanical tolerances, tuning, multipacting, cavity treatment, Helium vessel, heat loads, assembly etc...

Speaker: Kota Nakanishi (KEK)

Slides kekrd_kota.pdf kekrd_kota.ppt

14:45 LARP R&D for LHC

Cavity-coupler designs, RF characteristics, HOM damping, coupler configurations, mechanical tolerances, tuning, multipacting, cavity treatment, Helium vessel, heat loads, assembly etc...

Speaker: Zenghai Li (SLAC)

Paper ZLI-LCC-CC09-800MHz-Crab-Cavity.pdf

Slides ZLI-LCC-CC09-800MHz-Crab-Cavity.pdf

15:10 UK R&D for LHC

Cavity-coupler designs, RF characteristics, HOM damping, coupler configurations, mechanical tolerances, tuning, multipacting, cavity treatment, Helium vessel, heat loads, assembly etc...

Speaker: Dr Graeme Burt (Cockcroft Institute)

Slides LHC-CC_09_GB.pdf LHC-CC_09_GB.ppt

15:35 Discussion, Cavity Design

16:00 → 16:20 Coffee Break

16:20 → 18:00 Cryomodule Design

16:20 Cryostat & Tuner Compatability

Cryostat conceptual design, cavity-coupler constraints, access ports, vacuum, shielding, cryogenics, mechanical issues, Helium noise and regulation, physical constraints, assembly, testing and transport

Speaker: Vyacheslav Yakovlev (FNAL)

Slides Slava_Cryostat.pdf Slava_Cryostat.ppt

16:50 Mechanical & Thermal Issues

General mechanical and thermal considerations for SRF cryomodules, modeling tools, stress analysis, tuning, alignment, impact of the accelerator environment, issues and input for LHC crab cavity designs

Speaker: Paolo PIERINI (INFN Milano)

Slides Mech-Therm_v2.pdf Mech-Therm_v2.ppt

17:10 Compact Cavities

Novel deflecting cavity concepts, physical dimensions and frequency, feasibility for phase II , complexity of design (RF modeling, multipacting, HOM damping, fabrication, treatment, cryostat issues, prototypes)

Speaker: Dr Erk Jensen (CERN)

Slides Compact_Cavities.pdf Compact_Cavities.pptx

17:30 TEM Deflecting Cavity

New TEM concept, RF design & parameters, physical dimensions compared to conventional cavities, prototyping

Speaker: Jean Delayen (JLAB)

Slides LHC-CC-09-JRD.pdf LHC-CC-09-JRD.pptx

17:45 Discussion, Cryomodule

Thursday 17 September

08:30 → 10:20 Crab Cavity Integration

08:30 IP4 Boundary Conditions

Potential location for crabs in IR4 region, space constraints (longitudinal & transverse) for beam I and beam II, potential locations for cryogenic interfaces, power stations, transmission lines

Speaker: Olivier Brunner (CERN)

Slides Crabs-_IP4_Boundary_Conditions.pdf Crabs-_IP4_Boundary_Conditions.ppt

08:45 LHC Integration & RF Systems

Cryomodule interfaces, transport, tunnel installation, alignment, high voltage and RF power RF stations, RF valves and vacuum pumps, sensors and monitoring, reference signals, controls and feedback, cooling and ventilation, radiation issues and shielding, hardware safety

Speaker: Joachim Tuckmantel (CERN)

Slides Crab_RF_Syst.pdf Crab_RF_Syst.ppt

09:05 Cryogenics Installation

Operating temperature options, extension of main RF vs. crab specific cryogenic lines, Helium pressure, cryo circuits and controls, safety valves and protection, overall installation effort and time line, heat loads, impact on the LHC during prototype tests and regular operation

Speaker: Bruno Vullierme (CERN)

Slides CC_cryo_inst.pdf CC_cryo_inst.ppt

09:25 Low Level RF & Feedback

General noise sources, amplitude and phase stability, tolerances, options for LLRF control, limitations, state of the art, crab specific signals/controls, integration with LHC main RF, testing, software

Speaker: Mariusz Grecki (DESY)

Slides LLRF-CC09.pdf

09:45 KEK-B Instrumentation for Crab Cavity Tuning

Streak camera and crossing angle measurements, crab cavity amplitude and phase control using closed orbit distortion, orbit offsets at IP and luminosity measurements, orbit control and feedback near crab cavities and other instrumentation used for crab operation

Speaker: Yoshihiro Funakoshi (KEK)

Slides FunakoshiCrab2.pdf FunakoshiCrab2.ppt

10:05 Discussion, Integration

10:20 → 10:35 Coffee Break

10:35 → 12:15 Cryomodule Construction

10:35 Cavity Fabrication & Testing

Cavity SBIR and time line, engineering design, tooling, procurement, fabrication, e-beam welding, tuning, coupler ports, interfaces, Helium vessel, cavity treatment and testing options, impact based on down selection

Speakers: Ilan Ben-Zvi (Brookhaven National Laboratory), Michael Cole (Advanced Energy Systems)

slides LHC-CC09_Cavity_Fabrication_&_Test_Cole_Compressed_Pics.pdf LHC-CC09_Cavity_Fabrication_&_Test_Cole_Compressed_Pics.ppt

10:55 Cavity-Coupler Treatment & Testing

Buffer chemical polishing and electro-polishing options, baking and high pressure rinsing, clean rooms, vertical test facility for 800 MHz crab cavities, high power RF, instrumentation and high gradient performance

Speaker: Kota Nakanishi (KEK)

Slides

• cavity_coupler.pdf
• cavity_coupler.pptx
• cavity_coupler.pptx

11:15 Cryomodule Assembly & Test Stand

Cryomodule assembly options at CERN, test stand for low power and high power testing, high power RF availability, cryogenics, gradient performance in horizontal cryostat, mechanical and transport issues

Speaker: Pierre Maesen (CERN)

Slides CrabCav_meeting1115Th17.pdf CrabCav_meeting1115Th17.pptx

11:35 Discussion, Cryomodule Preparation & Cavity Down selection

12:15 → 14:00 Lunch

14:00 → 15:40 Phase I, Validation

14:00 RF Commissioning

Warm and cold commissioning, cavity conditioning and powering, low level and high level RF controls, data acquisition systems, phase-amplitude control and RF feedback loops, tuner control, high power RF commissioning and loops, synchronization

Speaker: Andrew Butterworth (CERN)

Slides RF_commissioning1.pdf RF_commissioning1.ppt

14:25 Machine Protection

Machine protection requirements and systems, interlocks and integration of crab cavity, worst case scenario and protection mechanism, safe limits for prototype tests, operational reliability, cavity trips etc..

Speaker: Dr Jorg Wenninger (CERN)

Slides MPS-crabs09.ppt.pdf MPS-crabs09.ppt.ppt

14:50 Safe Beam Tests

IR4 Crab Cavity: Injection-Ramp-Squeeze-Top energy, controls, interface with collimation, orbit control & feedback, cavity failures scenarios, cavity phasing & tuning, luminosity gain & leveling

Speakers: Dr Ralph Assmann (CERN), Dr Stefano Redaelli (CERN)

Slides SR_2009-09-15-cc-assmann-v3.pdf SR_2009-09-15-cc-assmann-v3.pptx

15:15 Discussion, Phase I Commissioning

15:40 → 16:00 Coffee Break

16:00 → 18:10 Phase II, Strategy

16:00 Phase II Scenarios

Local, global or mixed Crab Cavity schemes? What are the different lattice options and what are the most appropriate, Phase II scenarios to host Crab Cavities.

Speaker: Rama Calaga (BNL)

Slides cc09.pdf

16:30 IR Installation Issues for Phase II

Considerations to insert Crab Cavities in the IR, space constrains and possibilities of increase the available drift spaces, cryogenic, power and magnet considerations.

Speaker: ranko ostojic (CERN)

Slides Integration_of_CC_in_IR1_and_IR5.pdf Integration_of_CC_in_IR1_and_IR5.pptx

17:00 Phase II Operations

Local Crab Cavities: Injection-Ramp-Squeeze-Top energy, controls, interface with collimation, orbit control & feedback, cavity failures scenarios, cavity phasing & tuning, luminosity gain & leveling

Speaker: Dr Stefano Redaelli (CERN)

Slides SR_LHC-CC_2009-08-17.pdf SR_LHC-CC_2009-08-17.ppt

17:30 Discussion, Phase II

Friday 18 September

08:30 → 10:15 Planning & Milestones

08:30 Phase I, Schedule

Speaker: Edmond Ciapala (CERN)

Slides Phase_1,_Schedule.pdf Phase_1,_Schedule.pptx

08:50 Phase I Cost Estimate & Phase II Projection

Main cost drivers for the IR4 Crab Cavity insertion. Cost estimates for the first phase of the project and the projections for the second phase.

Speaker: Roland Garoby (CERN)

Slides CC_cost_estimates.pdf CC_cost_estimates.ppt

09:10 KEK Contributions, Funding

Speaker: Prof. Akira Yamamoto (High Energy Accelerator Research Organization (KEK))

09:25 LARP Contributions, Funding

Speaker: Dr Eric Prebys (Fermilab)

Slides larp_cc09_20090918.pdf larp_cc09_20090918.ppt

09:40 EUCARD Contributions, Funding

Speaker: Peter McIntosh (STFC)

Slides EUCARD_Contributions_and_Funding.pdf EUCARD_Contributions_and_Funding.ppt

10:00 Discussion, Schedule

10:15 → 10:35 Coffee Break

10:35 → 12:00 Down Selection

10:35 Down Selection, Discussion

11:20 Phase I, Discussion

11:40 Phase II, Discussion

12:00 → 14:00 Lunch

14:00 → 15:15 Advisory Board, Closed Session

14:00 Session I, Summary

Speaker: Jean-Pierre Koutchouk (AT/MCS)

Slides Summary_session_I__CC09.pdf Summary_session_I__CC09.pptx

14:15 Session II, Summary

Speaker: Yoshihiro Funakoshi (KEK)

Slides Session2Summary.pdf Session2Summary.ppt

14:30 Session III, Summary

Speaker: Jean Delayen (Thomas Jefferson National Accelerator Facility)

Slides SESSION_III_SUMMARY.pdf SESSION_III_SUMMARY.pptx

14:45 Session IV, Summary

Speaker: Paolo PIERINI (INFN Milano)

Slides Summary_session_IV_CC09.pdf Summary_session_IV_CC09.ppt

15:00 Session V, Summary

Speaker: Edmond Ciapala (CERN)

Slides Session_V_Summary.pdf Session_V_Summary.pptx

15:15 → 15:35 Coffee Break

15:35 → 17:20 Advisory Board, Closed Session

15:35 Session VI, Summary

Speaker: Peter McIntosh (STFC)

Slides Session_Summery_-_Cryomodule_Construction.pdf Session_Summery_-_Cryomodule_Construction.ppt

15:50 Session VII, Summary

Speaker: Dr Massimo Giovannozzi (CERN)

Slides giovannozzi_Summary_Session_VII.pdf giovannozzi_Summary_Session_VII.ppt

16:05 Session VIII, Summary

Speaker: Oliver Bruning (CERN)

Slides LHC-CC_Summary_session_8.pdf LHC-CC_Summary_session_8.ppt

16:20 Session IX, Summary

Speaker: Paul Collier (CERN)

16:35 Discussion

17:40 → 18:00 Public Close Out