1. Cockcroft Institute LC-ABD plenary April 2007 ILC Crab Cavity Collaboration Cockcroft Institute : –Richard Carter (Lancaster University) –Amos Dexter (Lancaster University) –Graeme Burt (Lancaster University) –Imran Tahir (Lancaster University) –Philippe Goudket (ASTeC) –Peter McIntosh (ASTeC) –Alex Kalinin (ASTeC) –Carl Beard (ASTeC) –Lili Ma (ASTeC) –Roger Jones (Manchester University) FNAL –Leo Bellantoni –Mike Church –Tim Koeth –Timergali Khabiboulline –Nikolay Solyak SLAC –Chris Adolphson –Kwok Ko –Zenghai Li –Cho Ng

2. Cockcroft Institute Crab System Development FY04-07 (LC-ABD1 UK) Initial study of a proposed ILC crab cavity solution has involved the design/simulation, and subsequent low power testing (i.e. without beam) of suitable cavity models. Wakefield budget identified and coupler requirements specified. The phase control stability requirements have been defined for 14 mR and a prototype digital DSP/FPGA LLRF system developed (tests expected in Q2 2007). LC-ABD plenary April 2007

3. Cockcroft Institute FY07-10 (LC-ABD2) LC-ABD plenary April 2007 PPARC (STFC from Apr 1st) have committed to a constrained 3-year funding plan: – Crab cavity has survived at half funding! – Significant funding profile implications. FY07-10 (LC-ABD2) funding can facilitate fabrication of a SRF crab cavity (incl. ancillaries) BUT ….. UK funding will not allow for: – Cryomodule R&D – High power RF R&D

4. Cockcroft Institute FY07-10 (LC-ABD2 UK) LC-ABD plenary April 2007 EDR Priorities: – Develop suitable coupler designs (CI/FNAL/SLAC): Verification by prototyping – Iterate on optimum cavity geometry design (CI/FNAL/SLAC): Verification by prototyping with optimum couplers – Develop suitable frequency and field orientation tuners (CI/FNAL): Verification by prototyping with optimum cavity design – Develop suitable LLRF phase control system (CI): Verification by testing with 2 x SRF single-cell crab cavities (vertical test) Verification by testing with 2 x SRF 1.3 GHz TM010 cavities (ERLP @ DL) – Fabrication of a single SRF crab cavity, incl. couplers and tuners, ready for cryomodule integration (CI): Verification by vertical test qualification

5. Cockcroft Institute FY07-10 (US) LC-ABD plenary April 2007 EDR Priorities: – Develop suitable cryomodule design and integrate cavity string (FNAL): Verification by beam tests on ILCTA @ FNAL – Develop and procure suitable HP RF delivery scheme (CI/FNAL) Verification by specification definition and subsequent beam tests on (ILCTA @ FNAL) – Fabricate a 2nd crab cavity module and HP RF delivery system (FNAL) Verification of complete system performance on ILCTA @ FNAL Beam loading effects are critical to the performance of the crab system and must be evaluated. ILCTA availability will drive these deliverables!

6. Cockcroft Institute Challenges and Synergies LC-ABD plenary April 2007 LLRF phase and synchronisation stability Couplers: – Input – RF power – LOM – peak magnetic fields – SOM – damping – HOM – fabrication and multipactor Tuning – Field polarisation Cryomodule: – Microphonics rejection

7. Cockcroft Institute Milestones Goal 1. Design build and test Input, HOM, LOM and SOM couplers. –Milestones 1.1 Apr 08: Coupler designs complete 1.2 Apr 09: Component prototype testing complete 1.3 Sep 08: Niobium coupler manufacture complete 1.4 Apr 09: Integration onto SCRF cavity complete Goal 2. Phase Control System development –Milestones 2.1 Sep 07: System simulations complete 2.2 Apr 08: Hardware manufacture complete 2.3 Dec 08: Final manufacture and provisional testing complete Goal 3 Design build and test cavity, couplers and cavity tuners –Milestones 3.1 Apr 08: Cavity design complete 3.2 Apr 09: Coupler testing complete 3.3 Apr 09:Cavity tuner development complete 3.4 Dec 09: Final manufacture and string assembly complete 3.5 Mar 10:TDR report complete

8. Cockcroft Institute Budget (at level funding for 3 years)