2nd Collaboration Meeting on X-band Accelerator Structure Design and Test-Program

13 May 2008, 08:30 → 15 May 2008, 15:00 Europe/Zurich

Building No.4 Seminar hall (KEK)

Sami Tantawi, Toshiyasu Higo (KEK), Walter Wuensch

The collaboration meeting on X-Band Accelerator Structure Design and Test Programs is an annual meeting to discuss aspects of design, manufacturing, and testing of high-gradient microwave linear accelerators based on room-temperature accelerator structures. The primary goal of this effort is to push forward the relevant technologies to a level that is readily applicable to highly reliable, higher-gradient accelerators of various scales, such as those needed for future linear colliders. The main topics of this meeting are structure design and associated test programs. The discussions aim to establish a better understanding of the frequency scaling of the limiting gradient, as well as its dependence on material, surface preparation, pulsed heating, etc. To this end, the meeting will allot a reasonable share of time for discussions on the RF breakdown phenomenon from both theoretical and experimental standpoints. Test facilities and the collaborative development of such facilities around the world will be discussed. We will also attempt at this meeting to gain perspective on the ultimate gradient reach. Recent developments will be discussed with the goal of firmly establishing the gradient reach of these technologies and furthering their practical application to specific accelerator designs.

Tuesday 13 May

08:30 → 09:00 Registration

09:00 → 10:30 Global scope

09:00 Opening Address

Speaker: Prof. Yukihide kamiya (KEK)

Slides Kamiya_X-band_Opening_Address Kamiya_X-band_Opening_Address.pdf

09:10 CLIC rf structure development program overview

Speaker: Dr Walter WUENSCH (CERN)

Slides program_overview_ww.pdf program_overview_ww.ppt

09:35 Progress in High Gradient Research for Future Colliders In The US

Speaker: Prof. Sami Tantawi (SLAC)

Slides Progress_in_high_gradient_accelerator_research_at_SLAC.pdf Progress_in_high_gradient_accelerator_research_at_SLAC.ppt

10:00 X-band high gradient activities at KEK

Speaker: Toshiyasu Higo (KEK)

Slides X-band high gradient activities at KEK X-band_high_gradient_activities_at_KEK.pdf

10:25 Announcement

Speaker: Dr Shuji Matsumoto (KEK)

Slides annoucement.pdf annoucement.ppt

10:30 → 10:45 coffee break

10:45 → 11:45 Structure design (1)

10:45 The nominal CLIC accelerating structure: CLIC_G

Speaker: Alexej Grudiev (CERN)

Slides Update_on_Structure_Optimization_CLIC_G.pdf Update_on_Structure_Optimization_CLIC_G.ppt

11:05 Test Accelerating Structures: designs, objectives and critical issues

Speaker: Riccardo Zennaro (CERN)

Slides Test_Accelerating_Structures_Designs,_Objectives_and_Critical_Issues.ppt.ppt

11:25 Introduction to the PETS design and testing program

Speaker: Igor SYRATCHEV (CERN)

Slides HG_2008_KEK_PETS#1.pdf HG_2008_KEK_PETS#1.ppt

11:45 → 13:00 Lunch

13:00 → 14:00 Exibition Time

13:00 → 17:00 Maker exibition

14:00 → 14:55 Structure design (2)

14:00 Damping and detuning the wake-field in CLIC X-band structures

Speaker: Dr Roger Jones (University of Manchester)

Slides Damped_And_Detuned_CLIC_Roger_M_Jones.pdf Damped_And_Detuned_CLIC_Roger_M_Jones.ppt

14:20 Development of single-cell accelerating structures

Speaker: Dr Valery Dolgashev (SLAC)

Slides Dolgashev_SingleCellAccStructures_DesignKEK_2048_11May08.pdf Dolgashev_SingleCellAccStructures_DesignKEK_2048_11May08.ppt

14:40 Discussion on design

Speaker: Toshiyasu Higo (KEK)

Slides Discussion_of_design_Q.pdf Discussion_of_design_Q.ppt

14:55 → 16:15 Structure fabrication (1)

14:55 Test structure fabrication: procedures, documentation and status

Speaker: Dr germana riddone (CERN)

Slides 20080513_production.pdf 20080513_production.pptx

15:15 SLAC Activities for Collaboration of X-Band Structure Design and Fabrication

Speaker: Dr Juwen Wang (SLAC)

Slides Wang_SLAC_May_2008.pdf

15:35 Quadrant fabrication study

Speaker: Toshikazu Takatomi (KEK)

Slides Quadrant_Fabrication_Study.pdf Quadrant_Fabrication_Study.ppt

15:55 General engineering and integration issues concerning the design of accelerating structure

Speaker: Risto Juhani Nousiainen (Helsinki Institute of Physics (HIP) - Univ. of Helsinki, Fac. of)

Slides

• General_engineering_and_integration_issues_concerning_the_design_of_accelerating_structure_KEK_fv.pdf
• General_engineering_and_integration_issues_concerning_the_design_of_accelerating_structure_KEK_fv.ppt
• General_engineering_and_integration_issues_concerning_the_design_of_accelerating_structure_KEK_fv.pptx

16:15 → 16:30 Coffee break

16:30 → 18:00 Structure fabrication (2)

Conveners: Germana Riddone (CERN), Yasuo Higashi (KEK)

16:30 Disk-damped versus quadrant-damped from engineering view point

Speaker: Yasuo Higashi (KEK)

Slides Disk-dumped_versus_Quadrant-damped_structure.pdf Disk-dumped_versus_Quadrant-damped_structure.ppt

16:50 Comparative analysis of disk and quadrant manufacture

Speaker: Dr germana riddone (CERN)

Slides 20080513_manufacturing.pdf 20080513_manufacturing.pptx

17:10 Manufacturing Experinece with Acceleration structures

Speaker: Richard Zoetewey (VDL)

Slides 2nd_Coll_Mtg_@_KEK-VDL_ETG_may-08.pdf 2nd_Coll_Mtg_@_KEK-VDL_ETG_may-08.ppt

17:30 Brain stroming on fabrication issues

Speaker: Yasuo Higashi (KEK)

Slides Brain_stroming_on_fabrication.pdf Brain_stroming_on_fabrication.ppt

Wednesday 14 May

08:30 → 09:00 Morning coffee

09:00 → 10:30 High gradient experiment (1)

09:00 Review of NLC/GLC Structure Results

Speaker: Chris Adolphsen (SLAC)

Slides CEA_High_Grad_Wks_07_05.pdf

09:20 Review of Structure Results at NLCTA Post NLC/GLC

Speaker: Chris Adolphsen (SLAC)

Slides CEA_Post_NLC_GLC_Results.pdf CEA_Post_NLC_GLC_Results.ppt

09:40 Recent 30 GHz results

Speaker: Steffen Doebert (CERN)

Slides slides

10:00 High gradient study result of T18_VG2.4_Disk

Speaker: Steffen Doebert (CERN)

Slides KEK_T18vg24results.pdf KEK_T18vg24results.ppt

10:30 → 10:45 Coffee break

10:45 → 11:45 High gradient experiment (2)

Conveners: Lisa Laurent (SLAC), Shuji Matsumoto (KEK)

10:45 Comprehensive Analysis of rf Test Results

Speaker: Alexej Grudiev (CERN)

Slides New_RF_constraint_update2008-04.pdf New_RF_constraint_update2008-04.ppt

11:05 Comparative analysis of OFE, CuZr: breakdown and pulsed surface heating

Speaker: Mr Sergio Calatroni (CERN)

Slides 2ndX.pdf 2ndX.ppt

11:25 Summary and discussion of present status of high gradient performance

Speaker: Toshiyasu Higo (KEK)

11:45 → 13:15 Lunch

13:15 → 16:10 Tour to laboratories and workshops

13:15 Nextef high power establishment

Speaker: Dr Shuji Matsumoto (KEK)

Slides Nextef_high_power__establishment.pdf Nextef_high_power__establishment.ppt

13:35 Nextef high gradient experiment status

Speaker: Toshiyasu Higo (KEK)

Slides Nextef_High_gradient_experiment_stauts.pdf Nextef_High_gradient_experiment_stauts.pptx

13:55 Explanation of tour

Speaker: Dr Shuji Matsumoto (KEK)

Slides tour.pdf tour.ppt

14:00 Meeting picture

Speaker: Nobu Toge (KEK)

pictures Meeting_Picture.jpg

14:10 Guided tour

Speakers: Kazue Yokoyama (KEK), Kenji Ueno (KEK), Dr Shuji Matsumoto (KEK), Yasuo Higashi (KEK)

16:10 → 16:30 coffee break

16:30 → 18:10 High gradient experiment (3)

16:30 Copper treatment for single-cell standing-wave structure

Speaker: Yasuo Higashi (KEK)

Slides Higashi_Copper_Treatment_for_Single_Cell_SW_structure.pdf Higashi_Copper_Treatment_for_Single_Cell_SW_structure.ppt

16:50 Status of tests of single cell accelerating structures

Speaker: Dr Valery Dolgashev (SLAC)

Slides Dolgashev_SingleCellAccStructuresExperimentsKEK_0940_15May08.pdf Dolgashev_SingleCellAccStructuresExperimentsKEK_0940_15May08.ppt

17:10 Narrow waveguide experiment

Speaker: Kazue Yokoyama (KEK)

Slides NarrowWaveguideExperiment.ppt.pdf NarrowWaveguideExperiment.ppt.ppt

17:30 Pulsed heating experiments

Speaker: Dr Lisa Laurent (SLAC)

Slides Pulse_Heating_Laurent.pdf Pulse_Heating_Laurent.ppt

17:50 Discussion toward ultimate gradient

18:40 → 20:40 Banquet

Thursday 15 May

08:30 → 09:00 Morning coffee

09:00 → 10:30 High power test system (1)

Conveners: Kazue Yokoyama (KEK), Shigeki Fukuda (KEK)

09:00 Planned program on crab cavity for CLIC

Speaker: Dr Roger Jones (University of Manchester)

Slides Crab_Cavity_CLIC_Roger_M_Jones.pdf Crab_Cavity_CLIC_Roger_M_Jones.ppt

09:20 Two beam test stand

Speaker: Igor SYRATCHEV (CERN)

Slides HG_2008_KEK_PETS#2.pdf HG_2008_KEK_PETS#2.ppt

09:40 Plans for the CERN klystron based test stand

Speaker: Karl-Martin Schirm (CERN)

Slides kschirm_KEK.ppt.pdf kschirm_KEK.ppt.ppt

10:00 Status of ASTA, Two-Pack system, and RF components Developments

Speaker: Prof. Sami Tantawi (SLAC)

Slides Test_Facilities_and_Component_Developments.pdf Test_Facilities_and_Component_Developments.ppt

10:30 → 10:45 Coffee break

10:45 → 11:45 High power test system (2)

Conveners: Kazue Yokoyama (KEK), Shigeki Fukuda (KEK)

10:45 Waveguide valve design with TE10 mode transmission

Speaker: Sergey Kazakov (Institute for Theoretical and Experimental Physics (ITEP))

Slides simple_valve_kazakov.pdf simple_valve_kazakov.ppt

11:05 Summary of high power devices and components for high gradient tests

Klystrons, loads, waveguide, windows, gas purge, treatment,

Speaker: Dr Shuji Matsumoto (KEK)

Slides

• Fukuda_Power_source_status.pdf
• Fukuda_Power_source_status.ppt
• Higo_Some_problems_in_waveguide_components.pdf
• Higo_Some_problems_in_waveguide_components.ppt
• Matsumoto_On_the_Limitation_of_RF_Pwr.pdf
• Matsumoto_On_the_Limitation_of_RF_Pwr.ppt

11:45 → 13:15 Lunch

13:15 → 14:15 High gradient strategy

Conveners: Juwen Wang (SLAC), Kazue Yokoyama (KEK)

13:15 Testing program & milestones for CLIC

Speaker: Steffen Doebert (CERN)

Slides Steffen_kekstructureplaning.pdf Steffen_kekstructureplaning.ppt

13:35 Strategy for high gradient

Discussion on Ultimate gradient goal and feasible gradient goal Parametrization Collaboration

Speakers: Prof. Sami Tantawi (SLAC), Toshiyasu Higo (KEK), Dr Walter WUENSCH (CERN)

Slides High_gradient_strategy_(Higo).pdf High_gradient_strategy_(Higo).pptx

14:15 → 15:00 Summary and closing

Conveners: Juwen Wang (SLAC), Kazue Yokoyama (KEK)

14:15 Summary

Speaker: Toshiyasu Higo (KEK)

Slides Higo_Summary_of_the_meeting.pdf Higo_Summary_of_the_meeting.ppt

14:45 Closing remark

Speaker: Prof. Atsushi Enomoto (KEK)

Slides Closing_RemarkEnomoto.pdf