1 / 40

Working Group Summaries: Accelerator RF Technology and Structures Systems and Instrumentation

Working Group Summaries: Accelerator RF Technology and Structures Systems and Instrumentation Matthias Liepe Cornell University. RF Technology and Structures We are almost there, But still a lot can and needs to be done. Accelerator Working Group: RF Technology and Structures

wbeamer
Download Presentation

Working Group Summaries: Accelerator RF Technology and Structures Systems and Instrumentation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Working Group Summaries: Accelerator • RF Technology and Structures • Systems and Instrumentation Matthias Liepe Cornell University

  2. RF Technology and Structures We are almost there, But still a lot can and needs to be done.

  3. Accelerator Working Group: RF Technology and Structures Monday, July 14, 8:30-10:30 a.m. 8:30-8:55 Warm and Cold RF Structures Hasan Padamsee 8:55-9:15 Technology Development Program for a Oleg Nezhevenko / Future 34-GHz Linac Vyacheslav Yakovlev 9:15-9:30 Acoustic Localization of RF Structure Breakdowns George Gollin 9:30-9:45 Optimized Cavity Shape for TESLA Valery Shemelin 9:45-10:00 1500 MHz Nb Cavity made of Electro- polished Half-Cells Rongli Geng 10:00-10:15 DC Breakdown Studies Greg Werner 10:15-10:30 Control of Beam Loss in High-Repetition Rate High-Power PPM Klystrons Mark Hess

  4. Accelerator Working Group: RF Technology and Structures Monday, July 14, 8:30-10:30 a.m. 8:30-8:55 Warm and Cold RF Structures Hasan Padamsee 8:55-9:15 Technology Development Program for a Oleg Nezhevenko Future 34-GHz Linac 9:15-9:30 Acoustic Localization of RF Structure Breakdowns George Gollin 9:30-9:45 Optimized Cavity Shape for TESLA Valery Shemelin 9:45-10:00 1500 MHz Nb Cavity made of Electro- polished Half-Cells Rongli Geng 10:00-10:15 DC Breakdown Studies Greg Werner 10:15-10:30 Control of Beam Loss in High-Repetition Rate High-Power PPM Klystrons Mark Hess

  5. Strategy: start with 23.5 MV/m Structures tested to 35 MV/m before installation Copper Niobium 1.3 GHz 1 m 11.4 GHz Start with Ea-loaded=50 MV/m (65MV/m-unloaded) Fewer structures 20,600 L = 21 km 18,500 L = 11.1 km Why 11.4 GHz? Peak RF Power needed to reach gradient a 1/√ frequency RF Losses = 55 W ea. Run pulsed at a duty factor of 0.7% Need RF peak power = 1.2x109 watt Dynamic heat load at 2 K = 10 kW + Static + safety = 30 kW refrigerator.. AC power = 22 MW RF Losses = 80 MW/m ! Total peak RF power = 1012 watt Duty Factor = 0.006% AC Power = 150 MW

  6. The best !

  7. 37 MV/m in Fully Equppied Cavity i.e. high power test and 1/8th of a TTF Linac module

  8. Accelerator Working Group: RF Technology and Structures Monday, July 14, 8:30-10:30 a.m. 8:30-8:55 Warm and Cold RF Structures Hasan Padamsee 8:55-9:15 Technology Development Program for a Oleg Nezhevenko Future 34-GHz Linac 9:15-9:30 Acoustic Localization of RF Structure Breakdowns George Gollin 9:30-9:45 Optimized Cavity Shape for TESLA Valery Shemelin 9:45-10:00 1500 MHz Nb Cavity made of Electro- polished Half-Cells Rongli Geng 10:00-10:15 DC Breakdown Studies Greg Werner 10:15-10:30 Control of Beam Loss in High-Repetition Rate High-Power PPM Klystrons Mark Hess

  9. Technology Development Program for a Future 34-GHz Linac • Oleg Nezhevenko • Goal: extend present 11 GHz RF technology by a factor of 3 to 34 GHz with hope to increase achievable gradients. • Built a 34 GHz magnicon (10 MW, 0.5 s) and cavity for pulsed heating tests. • Designed a 34 GHz 19 cell accelerating cavity.

  10. Accelerator Working Group: RF Technology and Structures Monday, July 14, 8:30-10:30 a.m. 8:30-8:55 Warm and Cold RF Structures Hasan Padamsee 8:55-9:15 Technology Development Program for a Oleg Nezhevenko Future 34-GHz Linac 9:15-9:30 Acoustic Localization of RF Structure Breakdowns George Gollin 9:30-9:45 Optimized Cavity Shape for TESLA Valery Shemelin 9:45-10:00 1500 MHz Nb Cavity made of Electro- polished Half-Cells Rongli Geng 10:00-10:15 DC Breakdown Studies Greg Werner 10:15-10:30 Control of Beam Loss in High-Repetition Rate High-Power PPM Klystrons Mark Hess

  11. Accelerator Working Group: RF Technology and Structures Monday, July 14, 8:30-10:30 a.m. 8:30-8:55 Warm and Cold RF Structures Hasan Padamsee 8:55-9:15 Technology Development Program for a Oleg Nezhevenko Future 34-GHz Linac 9:15-9:30 Acoustic Localization of RF Structure Breakdowns George Gollin 9:30-9:45 Optimized Cavity Shape for TESLA Valery Shemelin 9:45-10:00 1500 MHz Nb Cavity made of Electro- polished Half-Cells Rongli Geng 10:00-10:15 DC Breakdown Studies Greg Werner 10:15-10:30 Control of Beam Loss in High-Repetition Rate High-Power PPM Klystrons Mark Hess

  12. The hard limit for the increase in accelerating gradient in s.c. cavities is the surface magnetic field. Optimize cavity shape: One can, for example, sacrifice 20 % of electric field to gain 10 % in magnetic field and so increase the Acc. Rate by 10 %. old new

  13. Accelerator Working Group: RF Technology and Structures Monday, July 14, 8:30-10:30 a.m. 8:30-8:55 Warm and Cold RF Structures Hasan Padamsee 8:55-9:15 Technology Development Program for a Oleg Nezhevenko Future 34-GHz Linac 9:15-9:30 Acoustic Localization of RF Structure Breakdowns George Gollin 9:30-9:45 Optimized Cavity Shape for TESLA Valery Shemelin 9:45-10:00 1500 MHz Nb Cavity made of Electro- polished Half-Cells Rongli Geng 10:00-10:15 DC Breakdown Studies Greg Werner 10:15-10:30 Control of Beam Loss in High-Repetition Rate High-Power PPM Klystrons Mark Hess

  14. Motivation: Do heat treatment and electropolishing on half cells to reduce cost in s.c. cavity production.

  15. Accelerator Working Group: RF Technology and Structures Monday, July 14, 8:30-10:30 a.m. 8:30-8:55 Warm and Cold RF Structures Hasan Padamsee 8:55-9:15 Technology Development Program for a Oleg Nezhevenko Future 34-GHz Linac 9:15-9:30 Acoustic Localization of RF Structure Breakdowns George Gollin 9:30-9:45 Optimized Cavity Shape for TESLA Valery Shemelin 9:45-10:00 1500 MHz Nb Cavity made of Electro- polished Half-Cells Rongli Geng 10:00-10:15 DC Breakdown Studies Greg Werner 10:15-10:30 Control of Beam Loss in High-Repetition Rate High-Power PPM Klystrons Mark Hess

  16. DC breakdown studies on copper and niobium surfaces. • found starbursts and craters after breakdowns • found Manganese on all heat treated copper samples 50 um 145MV/m

  17. Accelerator Working Group: RF Technology and Structures Monday, July 14, 8:30-10:30 a.m. 8:30-8:55 Warm and Cold RF Structures Hasan Padamsee 8:55-9:15 Technology Development Program for a Oleg Nezhevenko Future 34-GHz Linac 9:15-9:30 Acoustic Localization of RF Structure Breakdowns George Gollin 9:30-9:45 Optimized Cavity Shape for TESLA Valery Shemelin 9:45-10:00 1500 MHz Nb Cavity made of Electro- polished Half-Cells Rongli Geng 10:00-10:15 DC Breakdown Studies Greg Werner 10:15-10:30 Control of Beam Loss in High-Repetition Rate High-Power PPM Klystrons Mark Hess

  18. Theoretical studies: Why do some klystrons show beam loss (and some don’t)? y x z L L Vz a r a r Vz Diagrams of Bunched Beam Models Pencil Beam Model (Presented at Arlington Meeting) Finite Size Beam Model (New)

  19. Comparison of Bunched Beam Models to Experiment gbsz/a=0.71 gbsz/a=0.36 gbsz/a=0.0 Red Curve: Pencil Beam Blue Curves: rb/a=0.5

  20. Systems and Instrumentation Good controls and instrumentation are essential for LC. Much work in progress, but a lot more needs to be done.

  21. Accelerator Working Group: Systems and Instrumentation Monday, July 14, 10:55-12:55 10:55-11:15 Accelerator Instrumentation RD Marc Ross 11:15-11:35 Prototype Synchrotron Radiation Telescope Jim Alexander 11:35-11:55 Design and Fabrication of a Radiation-Hard 500 MHz digitizer K K Gan 11:55-12:15 Nanometer resolution Beam Position Monitors Marc Ross 12:15-12:35 Nanometer BPM supports and movers Jeff Gronberg Tuesday, July 15, 1:50-3:50 p.m. 1:50-2:10 TTF data acquisition Tim Wilksen 2:10-2:30 Beam size diagnostics using diffraction radiation Bibo Feng 2:30-2:50 A0 coherent radiation diagnostics Court Bohn

  22. Accelerator Working Group: Systems and Instrumentation Monday, July 14, 10:55-12:55 10:55-11:15 Accelerator Instrumentation RD Marc Ross 11:15-11:35 Prototype Synchrotron Radiation Telescope Jim Alexander 11:35-11:55 Design and Fabrication of a Radiation-Hard 500 MHz digitizer K K Gan 11:55-12:15 Nanometer resolution Beam Position Monitors Marc Ross 12:15-12:35 Nanometer BPM supports and movers Jeff Gronberg Tuesday, July 15, 1:50-3:50 p.m. 1:50-2:10 TTF data acquisition Tim Wilksen 2:10-2:30 Beam size diagnostics using diffraction radiation Bibo Feng 2:30-2:50 A0 coherent radiation diagnostics Court Bohn

  23. Overview of beam instrumentations and controls; importance and influence on cost, performance and reliability of LC. • Examples: • correlation monitors • Multibunch behavior of u-wave cavity BPM’s • Long. phase space diagnostics based on deflecting RF • Marc’s Conclusion: • HEP must aggressively attack Controls/Instrumentation issues

  24. Accelerator Working Group: Systems and Instrumentation Monday, July 14, 10:55-12:55 10:55-11:15 Accelerator Instrumentation RD Marc Ross 11:15-11:35 Prototype Synchrotron Radiation Telescope Jim Alexander 11:35-11:55 Design and Fabrication of a Radiation-Hard 500 MHz digitizer K K Gan 11:55-12:15 Nanometer resolution Beam Position Monitors Marc Ross 12:15-12:35 Nanometer BPM supports and movers Jeff Gronberg Tuesday, July 15, 1:50-3:50 p.m. 1:50-2:10 TTF data acquisition Tim Wilksen 2:10-2:30 Beam size diagnostics using diffraction radiation Bibo Feng 2:30-2:50 A0 coherent radiation diagnostics Court Bohn

  25. Image synchrotron radiation from damping rings •  Snapshot from transverse bunch shape, single bunch resolution • Present: explore parameter space, identify key issues. • Next: system pro-design • Future: Test structures,…

  26. Accelerator Working Group: Systems and Instrumentation Monday, July 14, 10:55-12:55 10:55-11:15 Accelerator Instrumentation RD Marc Ross 11:15-11:35 Prototype Synchrotron Radiation Telescope Jim Alexander 11:35-11:55 Design and Fabrication of a Radiation-Hard 500 MHz digitizer K K Gan 11:55-12:15 Nanometer resolution Beam Position Monitors Marc Ross 12:15-12:35 Nanometer BPM supports and movers Jeff Gronberg Tuesday, July 15, 1:50-3:50 p.m. 1:50-2:10 TTF data acquisition Tim Wilksen 2:10-2:30 Beam size diagnostics using diffraction radiation Bibo Feng 2:30-2:50 A0 coherent radiation diagnostics Court Bohn

  27. radiation hard (> 60 MRad) • somewhat beyond state-of-the-art • started with design, are funded by DOE for design/simulation in first year • goal: has most circuit blocks ready for prototyping by end of first year

  28. Accelerator Working Group: Systems and Instrumentation Monday, July 14, 10:55-12:55 10:55-11:15 Accelerator Instrumentation RD Marc Ross 11:15-11:35 Prototype Synchrotron Radiation Telescope Jim Alexander 11:35-11:55 Design and Fabrication of a Radiation-Hard 500 MHz digitizer K K Gan 11:55-12:15 Nanometer resolution Beam Position Monitors Marc Ross 12:15-12:35 Nanometer BPM supports and movers Jeff Gronberg Tuesday, July 15, 1:50-3:50 p.m. 1:50-2:10 TTF data acquisition Tim Wilksen 2:10-2:30 Beam size diagnostics using diffraction radiation Bibo Feng 2:30-2:50 A0 coherent radiation diagnostics Court Bohn

  29. What are the uses of nanometer-resolution BPMs? – Measure beam position with accuracy better than support stability • Use the beam as a mechanical ‘device’ to prove active stabilization? – Measure beam parameters other than position • Many applications in beam manipulation • RF BPM ideal • 3 Balakin BPMs installed at ATF. • Started to study performance.

  30. Accelerator Working Group: Systems and Instrumentation Monday, July 14, 10:55-12:55 10:55-11:15 Accelerator Instrumentation RD Marc Ross 11:15-11:35 Prototype Synchrotron Radiation Telescope Jim Alexander 11:35-11:55 Design and Fabrication of a Radiation-Hard 500 MHz digitizer K K Gan 11:55-12:15 Nanometer resolution Beam Position Monitors Marc Ross 12:15-12:35 Nanometer BPM supports and movers Jeff Gronberg Tuesday, July 15, 1:50-3:50 p.m. 1:50-2:10 TTF data acquisition Tim Wilksen 2:10-2:30 Beam size diagnostics using diffraction radiation Bibo Feng 2:30-2:50 A0 coherent radiation diagnostics Court Bohn

  31. To demonstrate nanometer resolution the BPMs must be stable at the nanometer level with respect to one another. • Designed 3 hexapod-structure to hold and align BPMs. • Mechanical modes of the structure should be above 200 Hz, where they do not harm. • Vibration simulations are done, alignment frame is under construction. • Beam test at ATF in October 2003.

  32. Accelerator Working Group: Systems and Instrumentation Monday, July 14, 10:55-12:55 10:55-11:15 Accelerator Instrumentation RD Marc Ross 11:15-11:35 Prototype Synchrotron Radiation Telescope Jim Alexander 11:35-11:55 Design and Fabrication of a Radiation-Hard 500 MHz digitizer K K Gan 11:55-12:15 Nanometer resolution Beam Position Monitors Marc Ross 12:15-12:35 Nanometer BPM supports and movers Jeff Gronberg Tuesday, July 15, 1:50-3:50 p.m. 1:50-2:10 TTF data acquisition Tim Wilksen 2:10-2:30 Beam size diagnostics using diffraction radiation Bibo Feng 2:30-2:50 A0 coherent radiation diagnostics Court Bohn

  33. Cornell, DESY and OSU initiated a joined project to design and develop a TTF 2 data acquisition by using collaboration technologies as an example for a possible future GAN scenario. • Built on top of the DOOCS accelerator control system. • Development of collaborative tools. • First application: TTF2 FEL (2004). 50 to 100 GB/day.

  34. Accelerator Working Group: Systems and Instrumentation Monday, July 14, 10:55-12:55 10:55-11:15 Accelerator Instrumentation RD Marc Ross 11:15-11:35 Prototype Synchrotron Radiation Telescope Jim Alexander 11:35-11:55 Design and Fabrication of a Radiation-Hard 500 MHz digitizer K K Gan 11:55-12:15 Nanometer resolution Beam Position Monitors Marc Ross 12:15-12:35 Nanometer BPM supports and movers Jeff Gronberg Tuesday, July 15, 1:50-3:50 p.m. 1:50-2:10 TTF data acquisition Tim Wilksen 2:10-2:30 Beam size diagnostics using diffraction radiation Bibo Feng 2:30-2:50 A0 coherent radiation diagnostics Court Bohn

  35. y x e- z q a Why use diffraction radiation for beam diagnostic? • Non-invasive: Diffraction radiation through a slit. • Beam size diagnostics: longitudinal and transverse • Beam position monitor: radiation intensity vs. beam position • More beam information: beam energy and emittance • Status and Plans at Vanderbilt FEL: • Studies of diffraction radiation • Designed and built a interferometer • Future: • Radiator: vacuum chamber and slit actuator • Longitudinal bunch length experiments • Measurement of DR angular distribution • Transverse beam dimension experiments

  36. Accelerator Working Group: Systems and Instrumentation Monday, July 14, 10:55-12:55 10:55-11:15 Accelerator Instrumentation RD Marc Ross 11:15-11:35 Prototype Synchrotron Radiation Telescope Jim Alexander 11:35-11:55 Design and Fabrication of a Radiation-Hard 500 MHz digitizer K K Gan 11:55-12:15 Nanometer resolution Beam Position Monitors Marc Ross 12:15-12:35 Nanometer BPM supports and movers Jeff Gronberg Tuesday, July 15, 1:50-3:50 p.m. 1:50-2:10 TTF data acquisition Tim Wilksen 2:10-2:30 Beam size diagnostics using diffraction radiation Bibo Feng 2:30-2:50 A0 coherent radiation diagnostics Court Bohn

  37. Coherent radiation studies at A0 for beam diagnostic • Built a new, compact Michelson interferometer • Future goal: single shot measurement (with Fresnel mirror, no moving parts)

  38. Thank you Speakers! This was fun!

More Related