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Plans for Beta = 1 Cryomodules & Status at TESLA TTF

Plans for Beta = 1 Cryomodules & Status at TESLA TTF. Helen Edwards March 15 , 2005 TESLA Material from: D Kostin, H Brueck, N Walker, C Pagani, W-D Moeller, L Lilje, B Petersen, R Brinkmann. Beta 1 Cryomodule Outline. Whats in a module & cost history Proton Driver vs TTF, TESLA, achieved

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Plans for Beta = 1 Cryomodules & Status at TESLA TTF

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  1. Plans for Beta = 1 Cryomodules& Status at TESLA TTF Helen Edwards March 15 , 2005 TESLA Material from: D Kostin, H Brueck, N Walker, C Pagani, W-D Moeller, L Lilje, B Petersen, R Brinkmann

  2. Beta 1 Cryomodule Outline • Whats in a module & cost history • Proton Driver vs TTF, TESLA, achieved • TTF status • Module • Cavity • Input coupler • SMTF our plans (also P Limon and H Carter) • Cavities • Modules • PD vs LC Development • Conclusions H Edwards - Proton Driver Director's Review

  3. Cryo Module Parts • Cavities • Power input couplers • HOM couplers • Mechanical tuner • Piezo tuner • Quad/steering • BPM • Cold mass structure, cryo lines, cavity support • Outer vac vessel, support posts • Instrumentation- rf, e breakdown, vac, temp, magnet monitors, …. H Edwards - Proton Driver Director's Review

  4. CryoModule Costs History • 2002 Engineering Design Study (FNAL TM-2179) Est costs of TTF module ~1051 K Euro • Nb Material • Cost reduct, bulk order • CuNb, … • E beam Welder • Production welder • Input coupler • Cost • Process time • Tuner • Reliability? H Edwards - Proton Driver Director's Review

  5. PD Beta = 1 CryomodulesThe PD scale somewhere between TTF & XFEL • Modules PD TTF/XFEL/TESLA • Energy in-out GeV 1.2-8.0 out 1-2/ 20/ 250-500 • Length km 0.438 0.15/ 1.7/ 28-40 • # modules 36 5-7/ 120/ 1600-2400 • Cavities • Type 9cell TESLA TESLA • # cavities 288 64/ ~960/ 20-30,000 • # TTF cavities built 80-100 • Cavities/module 8 8/ 8/ 12/ • RF Unit • Cavities/kly-mod unit 36 {12} 8-16/ 40/ 36-24 H Edwards - Proton Driver Director's Review

  6. PD Beta = 1 CryoModules • Cavity Parameters PD/ultimate TESLA(achieved) • Gradient MV/m 26 25module, 35cav • Q >1e10 0.8e10 mod, 1e10cav • Beam Current mA 8.6/ 26 9 • Qext 4e6/ 1.5e6 2.6-3.7e6 • Input coupler Power kW 220/ 660 230-350, 600 • MacroPulse length mS 3 / 1 0.8 • Beam Duty Factor % 0.75/ 1 0.4 • RF Duty Factor % 1.0/ 1.3 0.65 • RF pulse max length mS 4.2/ 1.3 1.3-1.4 • Rep Rate Hz 2.5/ 10 5 (10) H Edwards - Proton Driver Director's Review

  7. TTF Module-Cavity Evolution • Modules- Types 1, 2, 3- 3 Generations & 10 Modules • Installed 1997 to 2004, cold time 5 - 44 months H Edwards - Proton Driver Director's Review

  8. TTF Module-Cavity Status H Edwards - Proton Driver Director's Review

  9. Cavity and Module fabrication is mature H Edwards - Proton Driver Director's Review

  10. Further Cryo Module Evolution at DESY • High gradient module- assembly this year • Module 3+ (pre XFEL prototype) • 2K quad cooling • Quad TTF superferric w bpm, fixed to invar rod as with cavities • Saclay type II tuners with integrated piezo • XFEL prototype • N*Lambda/2 cavity spacing • Possible metal seals of coupler to vac vessel • Industrial tech transfer contracts in 05 • Module test stand in 06 H Edwards - Proton Driver Director's Review

  11. Power Input Couplers • TESLA specifications (1.3msec) • TTF 250kW 10Hz adjustable, flexable (15mm) • TESLA 250-500kW, 5 Hz, fixed, fixed (1.5mm) • Superstructure 555kW-1110kW, 5Hz, fixed, fixed • PD250kW, 4.2msec, 2.5Hz or 730kW, 1.3msec, 10Hz • TTF history • 3 coupler types built and operating: FNAL, TTFII, TTFIII • Total of 40 used 97-04 Total of over 1/4 million coupler*hr • Warm TW- TTFII tested to 1.8MW, 2Hz (others to 1MW) • Cold Horiz Test SW- 33-35MV/m, 1.3msec, 10Hz • TTFIII Cold test- 35MV/m, 600kW, 10Hz, 2400hr no breakdn • Future: more design variants, cost & processing reduction, industrial studies H Edwards - Proton Driver Director's Review

  12. 0) 1 cavity (CapCav#2) FY05 FY06-08 FY08-09 FY09-…. Small modulator-klystron Phases of SMTF Beta=1 Modules • P. Limon (breakout) H Edwards - Proton Driver Director's Review

  13. Our plans Cavities (in process) • H Carter (breakout) • Cavities - Parallel path approach-starting this year • JLab adapt and commission their electropolish system(EP) for TESLA cavities • JLab to commission EP system with two cavities supplied from DESY • Cornell & AES to team on producing, BCP processing, and vertical dewar testing (VDT) 6 cavities • JLab to tool up to build model, prototype, and 4 Tesla cavities • KEK plans to provide 4 low loss (LL) cavities - higher gradient design to be processed and VDT at Cornell or JLab • Consideration being given to buying 4 Tesla cavities from Accel • Total cavities -18 Probably take at least 6 months to start seeing some cavities tested and at least 12-18 months to see sizable number tested • Nb Material order for 12 H Edwards - Proton Driver Director's Review

  14. Our Plans- SMTF Modules (1) • Step Zero- CryoCap#2 test in Meson by Oct-Challenging • Single cavity test with 4K helium and RF • Cavity prepared at DESY • DESY/FNAL module • DESY offered to provide a module TTF3+ in the mid 06, early 07 time scale • This depends to some extent on FNALs preparedness to deal with module assembly and readiness for test • Most likely implementation- • DESY to send tested cavities ready for string assembly. • String assembled in cleanroom at FNAL • Module then assembled from parts provided by DESY • US International ILC Module • Module assembled from cavities discussed above and components (eg cold mass) with possible contributions from collaborators. • Schedule - Plan to assemble these 2 modules starting late 06 continuing in 07 and cryo-RF test at least one in 07 H Edwards - Proton Driver Director's Review

  15. Our Plans Modules (2) • Design modification considerations for ILC • Cavity length- beam tubes same both ends ~ -3cm • Tuner type- blade or Saclay type II, with integrated piezo tuner • Quad- BPM package and power leads- needs to be packaged for clean room assembly- consider HTC leads- TESLA assembly must fit in module length • Quad location for maximum stability of BPM and minimum Quad vibration- below center post • Review end pipe cryo connections- efficient use of space. • For the future • HOM absorber (is it needed for PD?) • Tuner stepping motor reliability • Industrial design (DESY doing industrial tech transfer) • Differences LC and PD (PD closer to XFEL) • PD Gradient lower- dark current and Lorentz force less • Power coupler pulse length and power- PD longer, needs test • Adjustable coupling beta for different PD beam currents • Cavity spacing- LC mimimize, PD Lambda/2 • HOM coupler heating? But much less HOM power in PD • Quad-BPM package- for PD may be smaller/weaker (like XFEL?) • Alignment, Vibration- PD easier H Edwards - Proton Driver Director's Review

  16. CONCLUSIONS • The TESLA Beta 1 module design is well advanced and will continue to be refined and industrialized for XFEL • Cavity performance is almost there for PD requirements, but must be proven to be consistent • The SMTF effort should bring this technology to Fermilab/ US industry and prove operational requirements • Differences between PD, LC and XFEL modules will happen, but should be small, assuring a well understood basis • The cost will be better understood with US prototypes. Designs for cost reduction and industrialization will be undertaken • We and XFEL/TESLA have plans that will continue to reduce technical and cost risk H Edwards - Proton Driver Director's Review

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