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GLC Overview

GLC Overview. LCPAC 2004 (Feb. 20, 2004) Nobu Toge, KEK Accelerator Lab. GLC Schematic Layout. Main Linac Unit. Beam Structure vs RF Pulse. X-band Global Parameters. X-band IP Parameters. Main Linac Parameters (1). Main Linac Parameters (2). Major development in 2003.

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GLC Overview

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  1. GLC Overview LCPAC 2004 (Feb. 20, 2004) Nobu Toge, KEK Accelerator Lab. GLC Overview (N.Toge) - LCPAC 2004

  2. GLC Schematic Layout GLC Overview (N.Toge) - LCPAC 2004

  3. Main Linac Unit GLC Overview (N.Toge) - LCPAC 2004

  4. Beam Structurevs RF Pulse GLC Overview (N.Toge) - LCPAC 2004

  5. X-band Global Parameters GLC Overview (N.Toge) - LCPAC 2004

  6. X-band IP Parameters GLC Overview (N.Toge) - LCPAC 2004

  7. Main Linac Parameters (1) GLC Overview (N.Toge) - LCPAC 2004

  8. Main Linac Parameters (2) GLC Overview (N.Toge) - LCPAC 2004

  9. Major development in 2003 • Efforts on R1 and R2 items as laid out in TRC-II report in collab. with the NLC team. • Part of R1, R2 items cleared – PPM basic validation, SLED-II power compression. • Some remain – Accelerator structures • Efforts to continue in 2004 – Acc. structures. “Fuller” demonstration of SLED-II with additional waveguides and structure loads downstream. • Numerous beam control technology R&D at ATF. • Progress made in low-intensity emittance studies (single- vs multi-bunchgive consistent results at low-intensity) • Steady progress in I&C hardware (e.g. laser wire detector, ODR, XSR) • Construction and operation of GLCTA. • A basic 2-klystron power source system was built (~ 60MW, 400ns). • Initial system commissioning has begun and is expected to continue in 2004. • Will plan extension of the system to include SLED-II pulse compression or other upgrades in ~2 yrs. GLC Overview (N.Toge) - LCPAC 2004

  10. Updated TRC-II Information • http://lcdev.kek.jp/TRCII/TRCupdates.html • Status update of R&D efforts related to R1/R2 items • http://www.slac.stanford.edu/xorg/ilc-trc/2002/2002/report/03rephome.htm • TRC-II main web site • http://www.ligo.caltech.edu/~donna/ITRP_Home.htm • ITRP web site GLC Overview (N.Toge) - LCPAC 2004

  11. Quick Dictionary • TRC-II （Technical Review Committee-II）： Founded under ICFA in 2001. Charged to review the recent status of LC design schemes and R&D（SLAC-R-606, published in early 2003)。 • R1 : “R&D needed for feasibility demonstration of the machine” • R2 : “R&D needed to finalize design choices and ensure reliability of the machine” • R3 : “R&D needed before starting production of systems and components” • R4 : “R&D desirable for technical or cost optimization” • ILCSC （International LC Steering Committee）： Founded under ICFA in late 2002 to act as a steering body for world-wide cooperation on LC development. • ITRP　（International Technology Recommendation Panel ）： Placed by ILCSC in early 2003 to recommend on “Technology Selection” for LC GLC Overview (N.Toge) - LCPAC 2004

  12. PPM Klystron Status • Specifications [TRC R2#2] : Simultaneous achievement of • 75MW, • 1.6ms, • 120 Hz , or higher • Results in 2003: • Two PPM tubes built by KEK are approaching the spec. goals above. • A PPM tube built by SLAC cleared the goal in Fall, 2003. GLC Overview (N.Toge) - LCPAC 2004

  13. SLAC XP3-3 A.Vlieks@ISG-11 GLC Overview (N.Toge) - LCPAC 2004

  14. PPM Klystrons R&D • PPM #4 : under testing at KEK • Achieved: • 75MW, 1.7ms, 50Hz • Status: • - Testing at KEK after window repair has been temporarily concluded as of this week. Y.H.Chin@ISG-11 Y.H.Chin@ISG-11 • PPM#2 : under testing at SLAC Klystron lab. Achieved: • 75MW, 1.7ms, 60Hz • 68MW, 1.7ms 120Hz • Status: • - Gun repair nearly completed. PPM #5 : after baking Status: - Readied for testing to start at KEK Y.H.Chin@ISG-11 GLC Overview (N.Toge) - LCPAC 2004

  15. Plans for PPM Klystrons in 2004 • Existing tubes • PPM#5 :Has been built in 2003. Test to start at KEK in ~ March. • PPM#2 : Repair under way • PPM#4 : Temporarily concluded testing in Feb. • Some combination of KEK and SLAC PPM klystrons: Long-term high-rep-rate testing with a 2-pack IGBT modulator at SLAC. • New tubes • Further improvements to the body cooling system and electron gun. • More details: see presentation by Y.H.Chin GLC Overview (N.Toge) - LCPAC 2004

  16. Accelerator Structure R&D  Cells T.Higo Test Accelerator Struc.  Most of 60cm-long struc’s tested in 2003 include HOM slots and manifolds as required for GLC/NLC. J.Wang@ISG-11 GLC Overview (N.Toge) - LCPAC 2004

  17. Accelerator Structure Summary • Specifications [TRC R1#1]: Simultaneous achievement of • 60cm-long • ENL = 65MV/m, 400ns pulse length. • BD rate 0.1 / 1 hr in 60Hz operation. • Results in 2003: • A few strucs cleared the BD goal with ENL = 60MV/m, 400ns. • BD rate with ENL = 65MV/m remains x 2 ~ 3 of the goal. • Struc-to-struc variation of performance needs to be resolved. Some are suspected due to known anomalies during manufacturing or vacuum baking. • Much reduced BD rate observed with “ramped” pulse shape, known to be used for beam-loading compensation (All other typical high-power tests are done with rectangular pulses). Field Time GLC Overview (N.Toge) - LCPAC 2004

  18. High-Power Testing in 2002-2003. • H60-series built and tested in 2002-2003. • BD rate found to be prop. to gradient. • “Acceptable” BD rate performance at 60MV/m. • Performance not YET acceptable at 65MV/m. With pulse “ramping” substantial improvement seen. • Struc-to-struc variation of permance needs to be resolved. Keep eyes on manufacturing / heat processing. • Must accelerate the data collection with a plural # of structures with identical design and build. C.Adolphsen, Jan.2004 GLC Overview (N.Toge) - LCPAC 2004

  19. Plans for Acc Structures in 2004 • Highest priority: Additional construction of H60VG4S17-type structures  Improve the statistical / systematic confidence in performance observations of the latest struc design. • At SLAC expect to exploit the 2-moded SLED-II power source, in addition to the existing NLCTA test stations for accelerated, parallel testing. • Later this year we may reconsider - • More improvements to the structure design, or • GLC/NLC overall parameter optimization (ENL : 65  60MV/m gives only minor impacts on the cost, no impacts on the luminosity） • In parallel, try to improve the domestic capabilities： • More purely-made-in-Japan structures. • Build up infrastructure at GLCTA. • More details: see presentation by Toshi Higo GLC Overview (N.Toge) - LCPAC 2004

  20. Pulse Compression (2-moded SLED-II) Summary • Specifications [TRC R1#2]：simultaneous achievement of producing X-band RF power of • 475MW, • 400ns • Results in 2003： • Test at SLAC produced 475MW, 400ns at 30Hz on 12/4/2003. Continual operation for 100 hrs. • Used solenoid-focussing type klystrons x 4 as power source. • Maximum: 580MW, 400ns. GLC Overview (N.Toge) - LCPAC 2004

  21. Tested in 2003 Used solenoid-type klystrons x 4 56MW GLC Overview (N.Toge) - LCPAC 2004

  22. Input and Output pulses with SLED-II GLC Overview (N.Toge) - LCPAC 2004

  23. Plans for SLED-II in 2004 • Distribution of the SLED-II power to accelerator structures • Phase 1: 4 structures in Spring, 2004. • Phase 2: 4 more struc (8 in total) in Summer/Fall, 2004. • At each phase, semi-long-term operation at 60Hz. • Integration with structure testing in ~ Summer. • Integration with PPM klystrons later as found possible. • KEK team will contribute • Hybrids (overheight models) to use as “power splitters” • Personnel to participate in test operation at SLAC • More details: see presentation by Y.H.Chin GLC Overview (N.Toge) - LCPAC 2004

  24. 2004 Expansion of SLED-II testing Switching to PPM tubes as found possible Phase 1 Phase 2addition 56MW Introduce newly-built acc strucs as found available GLC Overview (N.Toge) - LCPAC 2004

  25. SLED-II additions in 2004 D.Schultz @ISG-11 GLC Overview (N.Toge) - LCPAC 2004

  26. Set up next to ATF. Possible beam acceleration exercise in the future. 2 solenoid-focused klystrons, straight power combiner, feeding one acc struc, as starter. Initial set-up built in 2003. Aim at testing ~ 65MV/m in 60cm-long structures in 2004. Later implement PPM klystrons. SLED-II also. Considering GLCTA as a homeground for building up domestic infrastructure / human resources. Continue full collaboration at NLCTA concerning rapid validation of required X-band technologies. For more details: see presentation by H.Hayano and T.Higo. GLCTA H.Hayano@ISG-11 GLC Overview (N.Toge) - LCPAC 2004

  27. GLCTA Hardware as of 2003 H.Hayano@ISG-11 GLC Overview (N.Toge) - LCPAC 2004

  28. Plans for GLCTA in 2004 • Stable delivery of 60MW, 400ns power to one 60cm-long accelerator structure • Powered by a pair of solenoid-focussed klystrons. • Misc improvement program in WR90 waveguide system. • Possibility of introducing circular WG for power handling margins. • Establish an acc struc test station similar to NLCTA.. • Preparation of RF power compression HW • New, PFN-based “two-pack” modulator delivery expected in Feb. • Commission the two PPM-focussed klystrons delivered in 2003. • Misc design and prep work for the pulse compressor hardware • More details: see presentation by H. Hayano, T. Higo, Y.H.Chin GLC Overview (N.Toge) - LCPAC 2004

  29. Summary • System Validation R&D for X-band (Higo / Chin) • Acc Struc: Clarify the high-power performance at around 60 – 65 MV/m in 2004. • PPM Klystron: Successful operation done in 2003. Will continue long-term + high-rep rate operation exercises in 2004. • SLED-II: Successful production of 475MW, 400ns pulses done in 2003. Will implement a full set of waveguide systems and acc structures downstream; and conduct a long-term operation exercise in 2004. • ATF (Hayano) • Beam physics: • Consistent emittance results in low-intensity single-bunch vs multi-bunch operations in 2003. Need to check high-intensity performance in 2004.. • Performance when wigglers are turned on. Study scheduled in 2004. • Beam instrumentation: Progress seen in understanding of laser-wire “thickness”, ODR, OTR, XSR. Continue efforts in 2004. • FEATHER: Fast beam feedback control exercise with nm-resolution BPMs. Prep efforts initiated in 2003, to continue in 2004. • Also in Japan • Modulator: Test operation of IGBT-type model scheduled in Spring-Summer, 2004 (Chin). • GLCTA: (Higo, Hayano) • Built in 2003. Will set up the system so that high-power operation of one 60cm-long acc struc becomes a routine in 2004. • Towards 2005, prepare implementation of SLED-II, with PPM tubes. • C-band (H.Matsumoto) • High-power test of acc struc: Scheduled at SPring-8 in spring, plus related development GLC Overview (N.Toge) - LCPAC 2004

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