1. B. Foster - Birmingham 7/11 Linear Colliders 1 Future Linear Colliders Brian Foster (GDE - Hamburg/DESY/Oxford) Birmingham Town Meeting

2. B. Foster - Birmingham 7/11 Linear Colliders 2 e + e - colliders CLIC 0.5 TeV: 13 km CLIC 1.5 TeV: 27 km 2 ILC 0.5 TeV – 30 km ILC 1 TeV ~ 45 km*

3. B. Foster - Birmingham 7/11 Linear Colliders 3 Parameters TechnologyILCCLIC Centre-of-mass energy (GeV) 500 3000 Total (Peak 1%) luminosity ( 10 3 4) 2.0(1.5) 2.3(1.4)5.9(2.0) Total site length (km) 31 13.048.3 Loaded accel. gradient (MV/m) 31.5 80100 Main linac RF frequency (GHz) 1.3 (Super Cond.) 12 (Normal Conducting) Beam power/beam (MW) 20 4.914 Bunch charge (10 9 e+/-) 20 6.83.72 Bunch separation (ns) 176 0.5 Beam pulse duration (ns) 1000 177156 Repetition rate (Hz) 5 50 Hor./vert. norm. emitt (10 -6 /10 -9 ) 10/40 4.8/250.66/20 Hor./vert. IP beam size (nm) 640/5.7 202 / 2.340 / 1 Hadronic events/crossing at IP 0.12 0.192.7 Coherent pairs at IP 10 1003.8 10 8 Wall plug to beam transfer eff 9.4% 7.5%6.8% Total power consumption (MW) 216 241568

4. B. Foster - Birmingham 7/11 Linear Colliders 4 ILC SCRF progress continues 2010 Milestone TDR Goal

5. B. Foster - Birmingham 7/11 Linear Colliders 5 ILC SCRF progress continues

6. B. Foster - Birmingham 7/11 Linear Colliders 6 ILC SCRF progress continues

7. B. Foster - Birmingham 7/11 Linear Colliders 7 ILC SCRF proof of principle FLASH @ DESY

8. B. Foster - Birmingham 7/11 Linear Colliders 8 Towards the TDR in 2012 RDRSB2009 Single Tunnel for main linac Move positron source to end of linac Reduce number of bunches by factor of two (lower power) Reduce size of damping rings (3.2km) Integrate central region Single-stage bunch compressor

9. B. Foster - Birmingham 7/11 Linear Colliders 9 What about LHC results? S. Dawson ALCPG11

10. B. Foster - Birmingham 7/11 Linear Colliders 10 Increasing SCRF Gradient Understanding in gradient limits and inventing breakthrough solutions are responsible for gradient progresses. This has been a tradition in SRF community and rapid gradient progress continues. Up to 60 MV/m gradient has been demonstrated in 1-cell 1300 MHz Nb cavity. 45-50 MV/m gradient demonstration in 9-cell cavity is foreseen in next 5 years. R.L. Geng

11. B. Foster - Birmingham 7/11 Linear Colliders 11 CLIC

12. B. Foster - Birmingham 7/11 Linear Colliders 12 Parameters TechnologyILCCLIC Centre-of-mass energy (GeV) 500 3000 Total (Peak 1%) luminosity ( 10 3 4) 2.0(1.5) 2.3(1.4)5.9(2.0) Total site length (km) 31 13.048.3 Loaded accel. gradient (MV/m) 31.5 80100 Main linac RF frequency (GHz) 1.3 (Super Cond.) 12 (Normal Conducting) Beam power/beam (MW) 20 4.914 Bunch charge (10 9 e+/-) 20 6.83.72 Bunch separation (ns) 176 0.5 Beam pulse duration (ns) 1000 177156 Repetition rate (Hz) 5 50 Hor./vert. norm. emitt (10 -6 /10 -9 ) 10/40 4.8/250.66/20 Hor./vert. IP beam size (nm) 640/5.7 202 / 2.340 / 1 Hadronic events/crossing at IP 0.12 0.192.7 Coherent pairs at IP 10 1003.8 10 8 Wall plug to beam transfer eff 9.4% 7.5%6.8% Total power consumption (MW) 216 241568

13. B. Foster - Birmingham 7/11 Linear Colliders 13 CTF3 @ CERN 150 MeV e-linac PULSE COMPRESSION FREQUENCY MULTIPLICATION CLEX (CLIC Experimental Area) TWO BEAM TEST STAND PROBE BEAM Test Beam Line 3.5 A - 1.4  s 28 A - 140 ns 30 GHz test stand Delay Loop Combiner Ring total length about 140 m magnetic chicane Photo injector tests, laser Infrastructure from LEP Demonstrate Drive Beam generation ( fully loaded acceleration, beam intensity and bunch frequency multiplication x8) Demonstrate RF Power Production and test Power Structures Demonstrate Two Beam Acceleration and test Accelerating Structures Demonstrate Drive Beam generation ( fully loaded acceleration, beam intensity and bunch frequency multiplication x8) Demonstrate RF Power Production and test Power Structures Demonstrate Two Beam Acceleration and test Accelerating Structures

14. B. Foster - Birmingham 7/11 Linear Colliders 14 RF Structure Breakdown

15. Tentative schedule new projects 15 B. Foster - Birmingham 7/11 Linear Colliders

16. B. Foster - Birmingham 7/11 Linear Colliders 16 ILC Experiments ILD SiD

17. B. Foster - Birmingham 7/11 Linear Colliders 17 UK activities There is no explicit STFC funding for UK participation in ILC. For CLIC, we negotiated contracts from CERN for key areas of accelerator R&D for 3 years. This support has now started. Despite lack of STFC support, many UK physicists continue to play leadership roles in both ILC & CLIC and in both accelerator and detectors. LCUK Collaboration continues. Had annual meeting last month in Oxford – attended by around 25 people. New spokesman election to replace BF under way. Since we were careful to work on generic technologies, almost all of this CLIC work is also applicable to ILC, and vice- versa. Despite lack of resources, amazing amount of excellent work continues to be done.

18. 09.00 Beam delivery and collimation studies conclusions: James Jones 09.25 CLIC quadrupoles: Ben Shepherd 09.50 CLIC cavity studies: Roger Jones 10.15 LC intra-train feedback, and CLIC drive beam phase feed-forward system: Glenn Christian 10.40 coffee 11.00 Longitudinal profile measurements: Allan Gillespie 11.25 Laserwire: Grahame Blair 11.50 Crab cavities: Praveen Ambattu 12.15 BPMs: Alexey Lyapin 12.40 discussion 13.00 lunch 14:00 LC status - Brian Foster 15:00 Status of SiD & CLIC detector aspects – Marcel Stanitzki (remotely) 15:15 Spider – Tony Price 15:35 Calice Beam tests: David Ward 15:55 Tea 16:15 Low-Mass - Joel Goldstein 16:35 Status of ILD & CLIC detector aspects - Mark Thomson 16:50 General discussion, including Collaboration Council meeting. B. Foster - Oxford LCUK 6/11 18 LCUK Agenda

19. B. Foster - Birmingham 7/11 Linear Colliders 19 Summary and Outlook ILC – technically mature – but costly. There were signs that Japan was moving towards bidding to build ILC – but then earthquake. Last month, governor of Tohoku province said: “To recover from the situation we face, we should have a long-term vision for people in Tohoku to prosper, taking pride in where we live.” [It is important for people to recover the everyday life they had before earthquake] “But I don’t think that is enough. The ILC can provide hope and pride to the people in Tohoku. We can also expect significant impact from the ILC on the economy and employment in the area” } CLOSE Collaboration CLIC – much R&D still required – cost? 2012-13 will be watershed in our subject. I have no idea what will happen – there may be an overwhelming momentum to build a LC – or there may be a bewildering uncertainty. It will be one of the most interesting times in my scientific career.

20. B. Foster - Birmingham 7/11 Linear Colliders 20 Final Word I have been more worried about the future of pp in the UK than now. I have never been more worried about the future of world particle physics. There are two scenarios in which pp can flourish: a)We develop a world organisation, based on CERN, which the major players in the other regions join; b)Each of the 3 major regions has a world-class facility on its soil. The third scenario, which we are drifting towards, is a single world-class facility based at CERN and no world organisation. This is not a sustainable scenario.