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Tunnel implementations (laser straight)
Central MDI & Interaction Region
CLIC near CERN
Outline:•CLIC and the CLIC CDR (brief)•Strategy and programme 2013-2018•With emphasis on 2013 activities •Conclusion
Possible CLIC stages studied in
the CDR
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Key features: •High gradient (energy/length)•Small beams (luminosity)•Repetition rates and bunch spacing (experimental conditions)
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The key results of the CDR studies
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CDR -> input to strategy processes
In addition a shorter overview document was submitted as input to the European Strategy update, available at:http://arxiv.org/pdf/1208.1402v1
Input documents to Snowmass 2013 has also been submitted:http://arxiv.org/abs/1305.5766 and http://arxiv.org/abs/1307.5288
European Strategy for Particle Physics
High-priority large-scale scientific activities
After careful analysis of many possible large-scale scientific activities requiring significant resources, sizeable collaborations and sustained commitment, the following four activities have been identified as carrying the highest priority (the point below is the one relating to very high energy machines)
d) To stay at the forefront of particle physics, Europe needs to be in a position to propose an ambitious post-LHC accelerator project at CERN by the time of the next Strategy update, when physics results from the LHC running at 14 TeV will be available. CERN should undertake design studies for accelerator projects in a global context, with emphasis on proton-proton and electron-positron high energy frontier machines. These design studies should be coupled to a vigorous accelerator R&D programme, including high-field magnets and high-gradient accelerating structures, in collaboration with national institutes, laboratories and universities worldwide.
Output: Post-LHC high energy frontier machines
Three stage operation scenario from the CDR
Strategy Output: what is means for CLIC Translated into goals for CLIC for the next European Strategy update (2018): Present a CLIC project that is a “credible” option for CERN beyond 2030-5:•Physics studies updated taking into account LHC-14 TeV (assume the physics case will be there for a high energy frontier machine – i.e. focus beyond the Higgs) •Physics ready after LHC programme completion (2030+) •Initial costs and upgrade costs for 2nd and 3rd stage in reasonable agreement with one could hope based on CERN resources with additional international help – considering a 20-30 year perspective
Three stage operation scenario from the CDR
In this perspective: issues for next phase:Design and Implementation studies:•CDR status: not optimized except at 3 TeV and not adjusted for Higgs discovery, not optimized cost, first power/energy estimates without time for reductions, limited industrial costing, very limited reliability studiesX-band developments: •CDR status: Single elements demonstrated – limited by test-capacitySystem-tests: •CDR status: CTF3 results initial phase (as of early 2012), ATF and FACET very little, no convincing strategy for further system verification, programmes for use of Xband techology for other applications in its infancy •CDR status concerning drive-beam FE: Nothing done beyond CTF3 Technology developments: •CDR status: alignment/stability partly covered, BBA assumed, wakefield mon. perf. assumed, no complete module
Main activities and goals for 2018
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Physics at LC from 250 GeV to 3000 GeV• Physics case for the Linear Collider:
• Higgs physics (SM and non-SM)• Top• SUSY• Higgs strong interactions• New Z’ sector• Contact interactions• Extra dimensions• …. AOP (any other physics) …
Specific challenges for CLIC studies: • Need to address Higgs-studies, including gains
for measurements at higher energies • Reach for various “new physics” (list above)
options; comparative studies with HiLumi LHC and proton-proton at higher energies (FCC).
References:CLIC CDR andhttp://arxiv.org/pdf/hep-ex/0112004.pdf
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Goal: •Optimize machine (beam parameters and compatible structures) wrt cost and power for 350 (well underway – see examples below), around 1500 (next) and 3000 GeV (CDR) – for various luminosities and safety factors (S)
- Expect significant cost and power reductions for the initial stages•Then we need to chose a new staged parameter set, with a corresponding consistent upgrade path (as done for the CDR), also considering the possibility of an initial klystron power stage See talk in the plenary session Friday
Re-baselining studies
Power/energy consumptions/reductions
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CERN energy consumption 2012: 1.35 TWh On-going developments (design/technical developments):•Use of permanent or hybrid magnets for the drive beam (order of 50’000 magnets)•Optimize drive beam accelerator klystron system •Electron pre-damping ring can be removed with good electron injector•Dimension drive beam accelerator building and infrastructure are for 3 TeV, dimension to 1.5 TeV results in large saving•Systematic optimization of injector complex linacs in preparation•Power consumption:
– Optimize and reduce overhead estimates
See parallel session tomorrow on power/energy studies:http://indico.cern.ch/conferenceTimeTable.py?confId=275412#20140204.detailed
Possible paths for power reductions outlined in the CDR:Re-optimize parts
Reduced current density in normal-conducting magnetsReduction of heat loads to HVACRe-optimization of accelerating gradient with different objective function
EfficiencyGrid-to-RF power conversionPermanent or super-ferric superconducting magnets
Energy managementLow-power configurations in case of beam interruptionModulation of scheduled operation to match electricity demand: Seasonal and DailyPower quality specifications
Waste heat recoveryPossibilities of heat rejection at higher temperatureWaste heat valorization by concomitant needs, e.g. residential heating, absorption cooling
Beyond: Scale with inst. luminosity – i.e. running at the end of the project lifetime might be power limited - require more time.
L-band klystron optimization studies
Graphic User Interface:
Main Linac Tolerances
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•Test of prototype shows• vertical RMS error of 11μm• i.e. accuracy is approx. 13.5μm
2) Beam-based alignment
Stabilise quadrupoleO(1nm) @ 1Hz
1) Pre-align BPMs+quadsaccuracy O(10μm) over about 200m
3) Use wake-field monitors accuracy O(3.5μm) – CTF3
CLIC performance verifications
FACET
NEXTEF at KEK
ASTA at SLAC
Very significant increase of test-capacity In addition several more collaborators have or plan to have X-band RF power capabilities
Previous:Scaled 11.4 GHztests at SLAC and KEK.
X-band test-stands
High-gradient accel. structure test status
Results very good – but: •numbers limited, industrial productions also limited •basic understanding of BD mechanics improving•condition time/acceptance tests need more work•use for other applications (e.g. FELs) needs verification In all cases test-capacity is crucial
Unloaded
Loaded (CLIC)
Incr
easin
g cu
rren
t
Gradient along the structureBeam loading reduces field locally in the structure
is it the break-down rate lower (or higher)?⇨
Use CTF3 drive beam and klystron driven X-band structure• Measure BDR with/without beam to get a direct
comparison
The effect of Beam-Loading on BD rate
Average gradient 100 MV/m
Drive beam, 1-3A, 100-50 MeV
50 mm circular waveguide
RF
T24 structure installed in CTF3
Beam loading/BDR experiment
Two-Beam Module, Wake-field monitors, Two-beam studiesRF pulse shaping
Power production, RF conditioning/testing with DB & further decelerator tests
Phase feed-forward,DB stability studies
CLIC Diagnostics tests
CTF3 programme 2013-2016
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CTF3 programme 2013-2016
2013-18 Development PhaseDevelop a Project Plan for a staged implementation in agreement with LHC findings; further technical developments with industry, performance studies for accelerator parts and systems, as well as for detectors.
2018-19 DecisionsOn the basis of LHC data
and Project Plans (for CLIC and other potential projects), take decisions about next project(s) at
the Energy Frontier.
4-5 year Preparation PhaseFinalise implementation parameters, Drive Beam Facility and other system verifications, site authorisation and preparation for industrial procurement. Prepare detailed Technical Proposals for the detector-systems.
2024-25 Construction StartReady for full construction
and main tunnel excavation.
Construction Phase Stage 1 construction of CLIC, in parallel with detector construction.Preparation for implementation of further stages.
Commissioning Becoming ready for data-
taking as the LHC programme reaches
completion.
CLIC future system tests
Systemtests (inside-outside CERN), beyond CTF3, discussed in parallel session Wednesday and plenary session Friday.
Links to what is required in the period 2018 onwards to move towards construction
• First klystron development contract ready to be signed
• Lots of progress on the modulator design• Gun designed finished, ready to construct• SHB design finished, ready to be build• Overall DB injector design well advanced • Gun test facility under construction
Drive Beam injector front end developments
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BI Type CLIC-3-DB CLIC-3-MB
Intensity 278 184
Position 46054 7187
Size 800 148
Energy (spread) 210 (210) 73 (23)
Bunch length 312 75
Beam loss / halo 45950 7790
Beam phase 208 96
Polarization 17
Tune 6
Luminosity 2
Key technology developments – in addition to the X-band related developments - crucial for performance and costs reasons, and hence need verification. Also essential for systemtests as described earlier (CTF3, ATF, Cornell … others). Some examples:•Pulsed, SC and warm magnets: Damping Rings Superconducting Wiggler and Kicker Development•Survey & Alignment, Stability, Magnet development, including PACMAN hardware•Beam Instrumentation and Control (see example of measurement numbers for instrumentation)•Two-Beam module development, for lab and CTF3 measurements •Vacuum systems, collimator studies
Technical Developments
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Tech. Dev: Modules and DR related
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Tech. Dev: PACMAN, stability (in ATF)
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High Gradient technology – other applications
2012 Goals: Feasibility, hoping for LHC physics guidance for post-LHC project Today: •High Gradient Technology ready for use at a reasonable scale (look outside our field)•Explore possibilities where compactness, costs, performance etc can be favourable (session Thursday, examples in the FEL area on this slide) •Very large interest among existing and new collaborators, and our industrial contacts
29 Countries – over 70 Institutes
Acceleratorcollaboration
Detectorcollaboration
Accelerator + Detector collaboration
CLIC CollaborationSeven new collaboration partners have joined in 2013 (The Hebrew University Jerusalem, Vinca Belgrade, ALBA/CELLS, Tartu University, NCBJ Warsaw, Shandong University, Ankara University Institute of Accelerator Technologies (IAT)) Detector collaboration operative (see talk later of F.Simon)
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Link: http://indico.cern.ch/conferenceDisplay.py?confId=275412
296 registered
Main elements:Open high energy frontier session session, including hadron options with FCC
Accelerator sessions focusing on collaboration efforts and plans 2013-2018, parallel sessions and plenary
High Gradient Applications for FELs, industry, medical
Physics and detector sessions on current and future activities Collaboration and Institute Boards
Dinner tomorrow
Summary
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The goals and plans for 2012-18 are well defined for CLIC, focusing on the high energy frontier capabilities – well aligned with current strategies Main challenges related to system specifications and performance, system tests to verify performances, X-band test-capacity and general use, technical developments of key elements and technologies, implementation studies including power and costs•The progress in these areas very significant in 2013, and plans and collaborative agreements are (being) in place for the coming yearsA re-baselining of the machine stages with particular emphasis on optmising the staging of the machine, to be able react on LHC physics and possible guidance about the energy scales of new physics The programme combines the resources of collaborators inside the current collaboration, and the collaboration is increasing The use and plans/studies of use of X-band/High gradient technology, in fields outside CLIC, have increased very rapidly and represent many exiting possibilities in the coming years
•Thanks to the CLIC collaboration for the slides and work presented
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Further reading: Main activities goals for 2018
Design and Implementation studies:•CDR status: not optimized except at 3 TeV and not adjusted for Higgs discovery, not optimized cost, first power/energy estimates without time for reductions, limited industrial costing, very limited reliability studies•Baseline design and staging strategy•Solid cost basis and more optimized power/energy (aim for 20% energy reduction)•Proof of industry basis for key components/units, in particular those specific for CLIC•Comprehensive reliability/robustness/uptime analysis •Pursue increased use of X-band for other machines/applications
System-tests: •CDR status: CTF3 results initial phase (as of early 2012), ATF and FACET very little, no convincing strategy for further system verification•Complete system-tests foreseen for next phase, and comprehensive documentation of the results at CERN (CTF3) and elsewhere, notably ATF and FACET •Strategy for further system verification before construction (XFEL, connected to light-sources, further drive-beam verifications) or as part of initial machine strategy. •CDR status concerning drive-beam FE: Nothing done beyond CTF3 •Demonstrator of drive beam FE and RF power unit based on industrial capacity – will open for larger facilities beyond 2018 if necessary
X-band developments: •CDR status: Single elements demonstrated – limited by test-capacity•Statistics for gradient and structure choice (energy reach) and other X-band elements
Technology developments: •CDR status: alignment/stability partly covered, BBA assumed, wakefield mon. perf. assumed, no complete module •Demonstration of critical elements and methods for machine performance and construction readiness:
DR, main linac, BDS with associated instrumentation and correction methods (combination of design, simulation, system-tests and technologies)
Stability/alignment (locally and over distances) Module including all parts
Some of the points have been partly addresses already in 2012-2013
