1. Chris Adolphsen Sergei Nagaitsev
Main Linac RF Systems
Chris Adolphsen
Sergei Nagaitsev
Main Linac RF Systems
9/13/06

2. WBS 3.8 and 5.8 R&D, Infrastructure and Test Facilities
Main Linac RF Systems
9/13/06

3. Modulators
Goal: Down select ILC modulator design by FY07-Q3 and have industry build six units: five for long term test at ESA and one for use at FNAL in FY09 for ILCTA.
Candidates
Baseline designs at DESY (PPT, ABB, FUG, Poynting), KEK (Nichicon) and FNAL(FNAL,SLAC)
SLAC Marx Generator
First Prototype in early FY07
Build two DFM versions by early FY08
DTI Direct Switch Modulator
Expect delivery to SLAC in early CY07
DTI Marx Generator
SBIR funded – expect sometime in CY08
Main Linac RF Systems
9/13/06

4. Modulators (cont) Infrastructure/Testing
RF Test Stands at FNAL,DESY and KEK
Generally run at less than max power for cryomodule operation.
SLAC ESB
Two new dedicated test stands in FY07 capable of 24/7 operation
Evaluate Marx and DTI modulators in FY07
Test two down-selected designs in FY08
SLAC ESA
Run five new test stands 24/7 in FY09 with industry built modulators
FNAL ILCTA
Run three cryomodules with industry built modulator in FY09
Main Linac RF Systems
9/13/06

5. Klystrons
Goal: Down select klystron design by end of FY08 and have industry build six units: five for long term test at ESA and one for use at FNAL in FY09 for ILCTA
Candidates
Baseline 10 MW MBK
DESY
Thales: 4 vertical tubes tested (none robust) and 4 in pipeline
CPI: 1 vertical tube tested at DESY – low efficiency
Toshiba: 1 vertical tube test at DESY – OK with 200 hrs operation
Request for bids out by DESY for ~ 3 horizontal tubes
SLAC
Buy 2nd generation vertical tubes from Toshiba and CPI in FY07
SLAC 10 MW Sheet Beam Klystron
Design well along – build two generations of tubes in FY07-08
Main Linac RF Systems
9/13/06

6. Klystrons (cont) Infrastructure/Testing
RF Test Stands at FNAL,DESY and KEK
Generally run at less than max power for cryomodule operation.
SLAC ESB
Two new dedicated test stands in FY07 capable of 24/7 operation
Evaluate Toshiba & CPI MBKs and SLAC SBKs in FY07/08
SLAC ESA
Run five new test stands 24/7 starting in FY09 with industry built klystrons.
FNAL ILCTA
Run three cryomodules with industry built klystron in late FY09
Main Linac RF Systems
9/13/06

7. RF Distribution
Goal: Develop low cost, efficient and agile distribution system - have three, 8-cavity systems in operation at FNAL in FY09
Changes being considered to baseline
Add adjustable tap-offs to maximize cavity gradients
Feed cavities in pairs via 3 dB hybrids to eliminate circulators
Use simpler phase shifters in place of three stub tuners
Use WR770 in place of WR650 for long waveguide runs
Weld Al waveguide in-situ instead of using flanges
Testing
Evolve design and provide FNAL one per year in FY07, 08 and 09.
First two will have optional circulators to allow beam operation with nl spacing of the cavities in the cryomodules.
Main Linac RF Systems
9/13/06

8. Couplers
Goals:
Understand processing limitations and evaluate surface contamination
Clean, bake, assemble and rf process coupler pairs for FNAL cavities
Revaluate TTF3 and other designs to reduce manufacturing cost
Program (collaboration of SLAC/LLNL/FNAL/Orsay)
FY07
RF process coupler parts
Build class 10 clean room in B006 and do surface contamination studies
Assemble and rf process 12 CPI couplers bought by FN
FY08-09
Supply up to 32 couplers per year for FNAL cavities
Revaluate coupler dimensional tolerances and assembly techniques and produce low cost versions.
Main Linac RF Systems
9/13/06

9. RF Unit Test
Goal: Assemble RF system at ILCTA in FY09 with as many industry built, ILC-ready components as possible to serve as a TDR model.
At ILCTA, power three cryomodules with rf system having
High efficiency, high power factor charging supply
120 kV, 130 A, 2.1 ms, 5 Hz modulator
10 MW, 65% efficient klystron
Low loss rf distribution system with adjustable tap-offs
High power couplers with adjustable Qext
Control system with interface to HA LLRF system and modulator/klystron interlocks.
ILC-like cooling system for klystron and racks
Operate accelerator with ILC-like bunch trains for few thousand hours.
Main Linac RF Systems
9/13/06

10. Warm Injector Structures
Goal: Verify that both the SW and TW structure designs for the warm injectors meet performance requirements
FY07 at NLCTA
Test half-length version of 11 cell SW structure (positron capture cavity) to 15 MV/m in a 0.5 T field using 1 ms, 5 MW pulses at 5 Hz.
FY08-09 at NLCTA
Test half-length version of 4.6 m TW structure (e+, e- accelerators) to 8 MV/m using 1 ms, 10 MW pulses at 5 Hz.
Main Linac RF Systems
9/13/06

11. Linac Quad/BPM
Goal: Build quad and cavity bpm that meet requirements for the beam-based quad alignment in the linacs.
FY06 at ESA
Tested half aperture S-band cavity bpm that achieved ILC resolution requirements – currently evaluating calibration stability
FY07
Test magnetic center stability of a prototype cos(2f) SC linac quad
SLAC/FNAL collaborate to build superferric quads (will likely reduce quad diameter) - test at SLAC
FY08-09
Assemble quad and bpm package for inclusion in ILCTA and perform quad shunting tests with beam.
Main Linac RF Systems
9/13/06

12. Schedule
Main Linac RF Systems
9/13/06

13. Schedule (cont)
Main Linac RF Systems
9/13/06

14. WBS 2.8 and 4.8 Design and Engineering
Main Linac RF Systems
9/13/06

15. RF System Integration
Goal: Complete TDR engineering design of the rf system integrated with the other systems in the beam and service tunnels
Interface with CF&S Group to finalize
Electrical connections and line loading specifications
Cooling connections and water flow and temperature stability requirements
Rack and RF component layouts
Interface with the Installation Group to
Design equipment and procedures to install components
Develop installation schedule and component check out scheme
Interface with Controls Group to
Provide high level interface to interlock and LLRF system
Main Linac RF Systems
9/13/06

16. Linac Quad Package
Goal: Engineer quad, bpm, corrector, beam scraper package for TDR
In FY09, finalize package layout wrt
Installing quad/bpm/correctors in separate cyrosection
Stray magnetic fields
Cooling scheme for power leads
Power and signal connections
Beam scrapers
BPM alignment and calibration requirements
Use of correctors versus quad movers
Minimizing heat loads
Installation in a clean environment
Main Linac RF Systems
9/13/06