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TTF-II Status & Prospectives

TTF-II Status & Prospectives. Nick Walker DESY 5 th ITRP Meeting – 28.06.04 CALTECH. Overview. Brief review of TTF activity this year Commissioning status / update Status of Technology Future plans. Successfully commissioned with beam. 3 rd harmonic cavity. 12 MV/m. 20 MV/m.

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TTF-II Status & Prospectives

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  1. TTF-II Status & Prospectives Nick WalkerDESY 5th ITRP Meeting – 28.06.04 CALTECH

  2. Overview • Brief review of TTF activity this year • Commissioning status / update • Status of Technology • Future plans

  3. Successfully commissioned with beam 3rd harmonic cavity 12 MV/m 20 MV/m diagnostic section RF gun beam dump bunch compressor ACC1 (M2*) Laser 4 MeV 150 MeV ACC2(M1*) ACC3(M3*) ACC4(M4) ACC5(M5) Successfully commissioned with RF power(hp coupler conditioning) TTF-II 800 MeV SC linac

  4. 3rd harmonic cavity 12 MV/m 20 MV/m diagnostic section RF gun beam dump bunch compressor ACC1 (M2*) Laser 4 MeV 150 MeV ACC2(M1*) ACC3(M3*) ACC4(M4) ACC5(M5) TTF-II 800 MeV SC linac Dark current & radiation measurements at 25MV/m  Pagani

  5. 3rd harmonic cavity 12 MV/m 20 MV/m diagnostic section RF gun ACC2(M1*) ACC3(M3*) beam dump bunch compressor ACC1 (M2*) Laser 4 MeV 150 MeV TTF-II Injector Commissioning • RF Gun: • 21-Feb-2004 start conditioning • 6-Mar-2004 5 Hz, 900 us, 3 MW • 16-Mar-2004 10 Hz, 450 us, 3 MW • 17-Mar-2004 first beam in gun section • Injector: • 15-Apr-2004 start injector commissioning • 7-Jun-2004 end commissioning • Linac: • 20-Aug-2004 restart with complete machine

  6. 3rd harmonic cavity 12 MV/m 20 MV/m diagnostic section RF gun ACC2(M1*) ACC3(M3*) beam dump bunch compressor ACC1 (M2*) Laser 4 MeV 150 MeV TTF-II Injector Commissioning  ACC1 coupler conditioning • RF Gun: • 21-Feb-2004 start conditioning • 6-Mar-2004 5 Hz, 900 us, 3 MW • 16-Mar-2004 10 Hz, 450 us, 3 MW • 17-Mar-2004 first beam in gun section • Injector: • 15-Apr-2004 start injector commissioning • 7-Jun-2004 end commissioning • Linac: • 20-Aug-2004 restart with complete machine  35MV/m EP cavity test

  7. 5109 35MV/m The 35MV/m Cryomodule Test AC72: one of five high-performance EP cavities

  8. 5109 35MV/m The 35MV/m Cryomodule Test AC72: one of five high-performance EP cavities Acceptance test in vertical cryostat • naked cavity • Low power • CW

  9. 5109 35MV/m The 35MV/m Cryomodule Test AC72: one of five high-performance EP cavities Acceptance test in vertical cryostat Transferred to Full 1/8th CM horizontal test (CHECHIA) • HP coupler • Tuner (fast/slow) • full power (system) test

  10. The 35MV/m Cryomodule Test AC72: one of five high-performance EP cavities Acceptance test in vertical cryostat Transferred to Full 1/8th CM horizontal test (CHECHIA) Transferred to Full 8 string CM TTF

  11. RF pulse with feedback in cavity 5 (AC72) during beam acceleration The 35MV/m Cryomodule Test AC72: one of five high-performance EP cavities Acceptance test in vertical cryostat Transferred to Full 1/8th CM horizontal test (CHECHIA) Transferred to Full 8 string CM TTF 35 MV/m EP TESLA Cavity accelerates beam for the first time 

  12. RF pulse with feedback in cavity 5 (AC72) during beam acceleration The 35MV/m Cryomodule Test • RF measurements showed no degradation of performance (35MV/m achieved) • RF gradient measurement calibrated using beam (energy spectrometer) • No measurable radiation detected(no dark current) No time for long-term system test due to TTF-II commissioning, but… 35 MV/m EP TESLA Cavity accelerates beam for the first time 

  13. AC73 Full System Test in1/8th Cryomodule (CHECHIA) • 1100 hr continuous operation at 35MV/m • No ‘faults’ observed • due to couplers • nor due to cavities • Forced ‘trips’ caused no damage to cavity/coupler • No performance degradation observed

  14. AC70: New EP Result! May 2004 Measured Q0 factor 2 over TESLA-800 specification 5109 35MV/m

  15. 3rd harmonic cavity 12 MV/m 20 MV/m diagnostic section RF gun ACC2(M1*) ACC3(M3*) beam dump bunch compressor ACC1 (M2*) Laser 4 MeV 150 MeV TTF-II Injector Commissioning • RF Gun: • 21-Feb-2004 start conditioning • 6-Mar-2004 5 Hz, 900 us, 3 MW • 16-Mar-2004 10 Hz, 450 us, 3 MW • 17-Mar-2004 first beam in gun section • Injector: • 15-Apr-2004 start injector commissioning • 7-Jun-2004 end commissioning • Linac: • 20-Aug-2004 restart with complete machine Problem-free commissioning of full ACC1 module for TTF-II operation

  16. TTF Beam Measurements Beam energy vs ACC1 phase Energy spread vs ACC1 phase beam energy (MeV) rms energy spread (MeV) ACC1 phase (deg)

  17. Energy Energy stability and Energy spread • Measured in the BC dispersive section after acceleration • LLRF with closed loop • energy stable within 0.1 %, rms = 8.5 10-4 • uncorrelated energy spread estimated from rising edge 25 to 30 keV

  18. Injector Commissioning:Other Highlights All possible due to ACC1 stable operation (turn-key system) • Successful commissioning of bunch compressor BC2 • Emittance measurements downstream of BC2 using four wire array station • Cavity as BPM…

  19. Measurement of Beam Position in Cavity using Dipole Mode • The signal of a dipole mode in a cavity can be used as an indication of the beam position (à la NLC) example for vertical steering and dipole mode response in C1 mode ‘centre’

  20. Measurement of Beam Position in Cavity using Dipole Mode • The signal of a dipole mode in a cavity can be used as an indication of the beam position (à la NLC) Resolution: <50mm example for vertical steering and dipole mode response in C1 mode ‘centre’ 4 dipole modes which couple strongly to the beam All modes co-axial within measurement resolution (50mm)

  21. Klystrons: 3 Active Companies • THALUS • First producer of prototype achieving specs. • 2 additional ‘production’ models • Tests of modified tubes in July. • CPI • 1st prototype development • Achieved 10MW for short pulse (tens of ms, h=60%) • Problems with longer pulse (understood and being addressed) • TOSHIBA • First prototype being prepared for initial testing (July)

  22. Klystrons: 3 Active Companies • THALUS • First producer of prototype achieving specs. • 2 additional ‘production’ models • Tests of modified tubes in July. • CPI • 1st prototype development • Achieved 10MW for short pulse (tens of ms, h=60%) • Problems with longer pulse (understood and being addressed) • TOSHIBA • First prototype being prepared for initial testing (July) 

  23. Klystrons: 3 Active Companies • THALUS • First producer of prototype achieving specs. • 2 additional ‘production’ models • Tests of modified tubes in July. • CPI • 1st prototype development • Achieved 10MW for short pulse (tens of ms, h=60%) • Problems with longer pulse (understood and being addressed) • TOSHIBA • First prototype being prepared for initial testing (July) In addition: pulse cable testing starts this week at DESY

  24. Immediate TTF-II Schedule 2004 2005 We are here 35MV/m TEST 20.08.04 Beam in modules 3-5

  25. Longer Term Saturation in wavelength range 30-120 nm July 2005 User operation (extended period) Operation with full electron beam current (to be defined; 2.25 MHz?) Dec. 2005 User operation (extended period) 3rd Harmonic RF system and ACC6 installed Feb. 2006 1 GeV beam energy April 2006 Saturation 6 nm June 2006 User operation (extended period) Seeding Option installed Dec. 2006 Seeding demonstration April 2007

  26. Longer Term Saturation in wavelength range 30-120 nm July 2005 User operation (extended period) Operation with full electron beam current (to be defined; 2.25 MHz?) Dec. 2005 User operation (extended period) 3rd Harmonic RF system and ACC6 installed Feb. 2006 1 GeV beam energy April 2006 Saturation 6 nm June 2006 User operation (extended period) Seeding Option installed Dec. 2006 Seeding demonstration April 2007

  27. High-Gradient Program • 30 new cavities from industry on order • First delivery August 2004 (total ~110) • Will be put through our established procedures • Electro-polishing, HPR etc. • No modifications to any aspect foreseen • 8 >35MV/m cavities will be installed into Cryomodule #6 • Tests will either be in TTF linac or • New Module Test Stand(supported in part by new EUROFEL money) • Date: 2006

  28. High-Gradient Program • 30 new cavities from industry on order • First delivery August 2004 • Will be put through our established procedures • Electro-polishing, HPR etc. • No modifications to any aspect foreseen • 8 >35MV/m cavities will be installed into Cryomodule #6 • Tests will either be in TTF linac or • New Module Test Stand(financed by new EU XFEL money) • Date: 2006

  29. Final Comments • TTF-II (on-going) commissioning on schedule • Turn-key stable operation • TTF-II (5 accelerating modules, 800 MeV) will be fully commissioned this year • All the demands of a light source user facility • ACC6 (35MV/m) scheduled for 2006 • Successful transfer of 35MV/m to a standard TTF cryomodule has been demonstrated in ACC1 • Acceleration with beam • No radiation measured (no dark current) • Process to produce 35MV/m cavities now established and well understood • Quality control required already exceeded by standard industry practise • Dark current under control  Pagani • XFEL activity rapidly ramping up  Brinkmann

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