Status and Future Prospects

Transcription

1 Status and uture Prospects for CLIC Introduction CLIC design CLIC Test acility (CT 3) results Outlook and Conclusions Steffen öbert, LINAC 08, , 2008, Victoria, Canada

2 Introduction CLIC = Compact Linear Collider (length ~ 50 km) Goal: esign for a 3 TeV e + e - linear collider ICA: LC is necessary to complement LHC physics ILC (0.5 TeV) or CLIC (3TeV) depending on LHC results European strategy for particle physics to be well positioned to push the energy frontier, R& on CLIC should be intensified as well as on high performance magnets and on high intensity neutrino facility Present: Mandate at CERN for a feasibility study with a CR in 2010

3 What is so special about CLIC High-requency and High-Gradient normal conducting rf: Accelerating gradient: 100 MV/m R frequency: 12 GHz Power extraction structure: 136 MW, 0.21 m long Two beam scheme: Low-energy high-current drive beam High-energy low-current main beam Sophisticated drive beam generation (high Q rf pulse compression using the beam) Main accelerator structure: 64 MW input power, 0.23 m long

4 CLIC schematic layout 326 klystrons 33 MW, 139 μs drive beam accelerator GeV, GHz 1 km delay loop CR1 CR2 combiner rings Circumferences delay loop 72.4 m CR m CR m CR2 CR1 326 klystrons 33 MW, 139 μs drive beam accelerator GeV, GHz 1 km delay loop decelerator, 24 sectors of 876 m TA BC2 245m R=120m BS 2.75 km e - main linac, 12 GHz, 100 MV/m, km 48.3 km IP BS 2.75 km e + main linac BC2 245m TA R=120m CLIC 3 TeV booster linac, 9 GeV e - injector 2.4 GeV e - PR 365m e - R 365m BC1 e + R 365m e + PR 365m e + injector, 2.4 GeV Not to scale!

5 CLIC 3 TeV parameters Center-of-mass energy 3 TeV Peak Luminosity cm -2 s -1 Peak luminosity (in 1% of energy) cm -2 s -1 Repetition rate 50 Hz Loaded accelerating ggradient 100 MV/m Main linac R frequency 12 GHz Overall two-linac length 41.7 km Bunch charge Bunch separation 0.5 ns Beam pulse duration 156 ns Beam power/beam 14 MW Hor./vert. normalized emittance 660 / 20 nm rad Hor./vert. IP beam size bef. pinch 40 / 1 nm Total site length 48 km Total power consumption 389 MW

6 New Main Beam accelerating structure Structure optimization taking into account: Rf constraints, Beam dynamics, collider performance and cost Structure T24vg1.7 requency: f [GHz] 12 Average iris radius/wavelength: <a>/λ 0.11 Input/Output iris radii: a 1,2 [mm] , N. of reg. cells, str. length: N c, l [mm] 24, 229 Bunch separation: N s [rf cycles] 6 illing time, rise time: τ f, τ r [ns] 62.9, 22.4 Pulse length: τ p [ns] Input power: P in [MW] 63.8 Max. surface field: E surf max [MV/m] 245 Max. temperature rise: T max [K] 53 Efficiency: η [%] 27.7 See Poster, THP062, A. Grudiev

7 Prototype accelerating structure Collaboration between KEK, SLAC and CERN High Power test of T18_VG2.4_disk [1] requency: GHz Cells: 18+2 matching cells illing Time: 36 ns Length: active acceleration 18 cm Iris ia. a/λ 0.155~0.10 Group Velocity: vg/c % Phase Advace Per Cell 2π/3 Power for <Ea>=100MV/m 55.5 MW Unloaded Ea(out)/Ea(in) 1.55 Es/Ea 2 CLIC goal: trip rate < /m Proof of principle! No HOM damping yet See Poster, THP061, TUP057

8 eceleration structure Power Extraction and Transfer Structure (PETS) Special development for CLIC 8 Sectors damped on-off possibility Travelling wave structures (136 MW for 240 ns per structure) Small R/Q : 2.2 kω/m (accelerator: kω/m) High group velocity vg/c = 48 % 0.21 m active length ( ~ needed per linac) 100 A beam current Status: R power testing at SLAC and with beam in CT3 at the end of 2008 ref: Igor Syratchev

9 CLIC module Transfer lines rive Beam Main Beam

10 Beam quality and preservation Generating ultra low emittance beams: e - injector 2.4 GeV e - PR 365m e - R 365m booster linac, 9 GeV BC1 e + e + R 365m PR 365m e + injector, 2.4 GeV CLIC has two damping rings each for e + and e - output R: γε x =381 / γε y = 4.1 nm rad for 4.1*10 9 particles at 2.4 GeV Key issues: high field wiggler, e - -cloud Preserving ultra low emittance beams: Beam size at Interaction Point (rms) : σ x = 40 nm, σ y = 1 nm Jitter tolerances inal ocus quadrupoles Main beam quadrupoles Vertical ~0.2 nm > 4 Hz ~1 nm > 1 Hz Horizontal 2 nm > 4 Hz 5 nm > 1 Hz Proof-of-principle: quadrupole stabilized to < 0.5 nm in vertical plane

11 CLIC Test acility; CT3 acility to demonstrate critical issues for CLIC magnetic chicane 150 MeV e-linac 30 GHz test stand 3.5 A μs PULSE COMPRESSION REQUENCY MULTIPLICATION elay Loop Combiner Ring Photo injector tests, laser 10 m CLEX (CLIC Experimental Area) TWO BEAM TEST STAN PROBE BEAM Test Beam Line 28 A ns total length about 140 m

12 CT3 vs CLIC CT3 is scaled down from CLIC and uses existing infrastructure: Main goals: emonstrate CLIC drive beam generation emonstrate 12 GHz rf structure with two beam acceleration emonstrate stable and efficient deceleration with test beam line CLIC CT3 rive Beam energy 2.4 GeV 150 MeV compression / frequency multiplication 24 (elay Loop + 2 Combiner Rings) 8 (elay Loop + 1 Combiner Ring) i rive Beam current 4.2 A* A A*8 28 A R requency 1 GHz 3 GHz train length in linac 139 μs 1.5 μs energy extraction 90 % ~ 50 %

13 ully loaded drive beam linac Proof of one of the major CLIC features: ull Beam Loading rive Beam accelerating structure: R to beam transfer: 95.3 % measured R power at output of accelerating structure Linac routinely operated with full beam loading See Poster, TUP081, A. abrowski

14 Phase coding with sub-harmonic buncher s one of three buncher cavities 1.5 GHz Switching transient about 7 bunches 140 ns 20 cm 140 ns odd buckets odd+ even 10 cm sub-pulse length pulse length 140 ns even buckets between buckets between pulse gap bunches bunches 1.6 μs train length A current 1.6 μs train length - 7 A peak current

15 elay Loop, irst Results circumference 42 m (140 ns) isochronous optics wiggler to tune path length (9 mm range) CT.BPM A A CT.BPM A esigned and built by INN rascati

16 Combiner Ring st 1 turn injection septum nd 2 deflector line st 1 deflector 2 nd local inner orbits λ 0 transverse deflector field 3 rd 4 th λ 0 /4 Train spacing = M λ o = ring circumference ± λ o / 4 λ o bunch spacing λ o / 4 bunch spacing 4 trains - I o peak current 1 train - 4 I o peak current

17 Combiner Ring, first results Optics studied and first recombination trials: Linac current lower than nominal L bypassed (no holes, missing factor 2) Losses during recombination (instability ) 2.6 A current Vpos 8.5 A Hpos 10.4 A See Poster, TUP056, P. Skowronski

18 CLIC experimental area (CLEX) existing building rive Beam, 150 MeV, 30 A, 140 ns ecelerator test, TBL 8 m 2.0m UMP UMP 1 6 m UMP 16.5 m 0.75 TBTS 16 m ITB 2.5m Transport path 1.4m UMP TBL 22.4 m 1.85m LIL-ACS 22 m UMP 3.0m LIL-ACS LIL-ACS TL2 3.0m 2 m CALIES Probe beam injector 42.5 m Two beam acceleration, Two Beam Test Stand (Upsalla University) Probe Beam, 180 MeV (CEA-aphnia) Installation of equipment from Beam in CLEX since August See Poster, TUP004,. Peauger

19 Test beam Line (TBL) ecelerator experiment High energy-spread beam transport decelerate to 50 % beam energy rive i Beam B stability bili Stability of R power extraction total power in 16 PETS: 2.4 GW Alignment procedures 5 MV/ MV/m deceleration d l ti (30 A) per PETS 150 MV output Power 1 standard cells, cells 16 total PETS development: CIEMAT BPM: IIC Valencia and UPC Barcelona

20 CLIC long term scenario Shortest, Success Oriented, Technically Limited Schedule (Jean-Pierre elahaye) Technology evaluation and Physics assessment based on LHC results for a possible decision on Linear Collider funding with staged construction starting with the lowest energy required by Physics easibility issues (Accelerator&etector) Conceptual design and cost estimation esign finalisation and technical design Engineering optimisation Project approval & final cost Construction accelerator (poss. staged) Construction detector CR TR Project approval irst Beam

21 Tentative CLIC 500 GeV conservative parameters Center-of-mass energy 500 GeV Peak luminosity y( (in 1% of energy) cm -2 s -1 Repetition rate 50 Hz Loaded accelerating gradient 80 MV/m Main linac R frequency 12 GHz Overall two-linac length 8.8 km Bunch charge Bunch separation 0.5 ns Beam pulse duration 177 ns Beam power/beam 4.9 MW Hor./vert. normalized emittance 3000 / 40 nm rad Hor./vert. IP beam size bef. pinch 221 / 2.8 nm Total site length 12.8 km Total power consumption 126 MW

22 Conclusions Consistent and realistic parameter set for CLIC Conservative 500 GeV parameters and staged construction to 3 TeV under development easibility demonstration ti n well advanced d rive beam partly demonstrated full beam loading, bunch phase coding, delay loop operation, first results on combiner ring Proof of principle p for the accelerating structure easibility demonstration and CR by 2010 Very strong and growing collaboration for Very strong and growing collaboration for CT3 and CLIC

23 CLIC / CT3 collaboration Ankara University (Turkey) Berlin Tech. Univ. (Germany) BINP (Russia) CERN CIEMAT (Spain) innish Industry (inland) Gazi Universities (Turkey) IRU/Saclay (rance) Helsinki Institute of Physics (inland) IAP (Russia) IAP NASU (Ukraine) Instituto de isica Corpuscular (Spain) INN / LN (Italy) J.Adams Institute, (UK) 24 collaborating institutes JASRI (Japan) JINR (Russia) JLAB (USA) KEK (Japan) LAL/Orsay (rance) LAPP/ESIA (rance) LLBL/LBL (USA) NCP (Pakistan) North-West. Univ. Illinois (USA) Oslo University PSI (Switzerland), Polytech. University of Catalonia (Spain) RAL (England) RRCAT-Indore (India) Royal Holloway, Univ. London, (UK) SLAC (USA) Svedberg Laboratory (Sweden) Uppsala University (Sweden)

24 Reserve slides

25 CT3 collaboration CT3 Collaborations INN-LN CIEMAT BINP LURE CERN NWU LAPP Uppsala INN-LN CERN INN-LN CERN CERN NWU PSI Uppsala RRCAT TSL CERN CERN LAL SLAC IAP Uppsala CERN CEA-APNIA CERN LAL CIEMAT UPC IIC CERN R.Corsini

26 New Main Beam accelerating structure Structure optimization taking into account: Rf constraints, Beam dynamics, collider performance, cost Structure T24vg1.7 requency: f [GHz] 12 Average iris radius/wavelength: <a>/λ 0.11 Input/Output iris radii: a 1,2 [mm] , N. of reg. cells, str. length: N c, l [mm] 24, 229 Bunch separation: N s [rf cycles] 6 illing time, rise time: τ f, τ r [ns] 62.9, 22.4 Pulse length: τ p [ns] Input power: P in [MW] 63.8 Max. surface field: E surf max [MV/m] 245 Max. temperature rise: T max [K] 53 Efficiency: η [%] 27.7