cern.ch CLIC MEETING (17-Dec-2010) CLIC TWO-BEAM MODULE LAYOUT (short introduction) BE / RF 1

cern.ch Many issues appear often during integration ! CLIC TWO-BEAM MODULE SYSTEMS The baseline solutions were defined for each technical system and a solution for CDR is available The module design and integration has to cope with challenging requirements from different technical systems. 2 SYSTEMREQUIREMENT/S R FAS shape tolerance ± 2.5 µm INSTRUMENTATION BPM resolution: MB - 50 nm, DB – 2 µm, temporal - 10 ns (MB & DB), SUPPORTING Max. vertical & lateral deformation of the girders in loaded condition 10μm COOLING~400 W per AS MAGNET & POWERING DB T/m, current density: 4.8 A/mm2, MB 200 T/m PRE-ALIGNMENT & STABILIZATION active pre-alignment ± 10 µm at 1σ, MB Q stabilization 1 nm >1Hz VACUUM10 -9 mbar ASSEMBLY, TRANSPORT, INSTALLATION same transverse interconnection plane for DB & MB

cern.ch CLIC TWO-BEAM MODULE SYSTEMS 3 It is impossible to separate the components and consider them as a system-belonging part. We are about module integrated sub-units. COOLING R F MAGNET & POWERING ASSEMBLY, TRANSPORT, INSTALLATION SUPPORTING VACUUM PRE-ALIGNMENT & STABILIZATION INSTRUMENTATION... “BPM – DBQ - PETS IC” “IC – BPM – MBQ – Dipole Corr. - IC” “PETS - RF NET - AS” “Girder - Pos. System - Stabiliz. System - Structure Support” CLIC TWO-BEAM MODULE

cern.ch MB ~1 A DB 100 A CLIC MODULE TYPE 1 ( BASELINE FOR CDR ) 4 MB QUAD ACCEL. STRUCTURE (BRAZED DISKS) VAC ION PUMP REF. SPHERE ALIGNMENT SYSTEM BEAM INSTRUMENTATION DB QUAD COOLING CIRCUIT RF LOAD PETS ( OCTANTS, MINI-TANK ) PETS ON-OFF MECHANISM MB Q SUPPORT & STABILIZATION CRADLE COMPACT COUPLER VAC. MANIFOLDS

cern.ch MODULE TYPES 5 + special modules (damping region, modules with instrumentation and/or vacuum equipment) to be studied in TDR phase CLIC Module Type1 154 per Linac CLIC Module Type1 154 per Linac 1 pair of AS replaced by MB Quadrupole Standard Module (L=2010 mm) DB (100 A) 4 PETS, 2 Quads with BPM Each PETS feeds 2 AS MB (1 A) 8 acc. structures MB filling factor: 91% Standard Module (L=2010 mm) DB (100 A) 4 PETS, 2 Quads with BPM Each PETS feeds 2 AS MB (1 A) 8 acc. structures MB filling factor: 91% Standard Module 8374 per Linac Standard Module 8374 per Linac Module Type per Linac Module Type per Linac Module Type per Linac Module Type per Linac Module Type per Linac Module Type per Linac

cern.ch Detailed design to be optimized for TDR COMPLEXITY Brazed disks with “compact” coupler & vacuum system, micro-precision assembly, cooling circuits (~400 W per AS) wakefield monitor (1 WFM per SAS), interconnection to MB Q (stabilization!) structure support (alignment), output WG with RF components (e.g. loads) RF distribution (WGs & splitters) COMPLEXITY Brazed disks with “compact” coupler & vacuum system, micro-precision assembly, cooling circuits (~400 W per AS) wakefield monitor (1 WFM per SAS), interconnection to MB Q (stabilization!) structure support (alignment), output WG with RF components (e.g. loads) RF distribution (WGs & splitters) ACCELERATING STRUCTURE 6 The design of AS is driven by extreme performance requirements. The assembly accuracy is ±5 µm. Many features of different systems, such as vacuum, cooling, WFM as well as damping waveguide absorbers are incorporated into design. WFM Schematic layout of CLIC Module Super-AS A S S u p e r - A S AS with WFM  Validation in CLEX (2011) Collaboration with CEA-Saclay AS with WFM  Validation in CLEX (2011) Collaboration with CEA-Saclay

cern.ch PETS DESIGN & INTEGRATION The PETS are composed of eight bars milled with mm shape accuracy. The octants assembly, mini-tank, “ON-OFF” mechanism combined with compact coupler, vacuum system, cooling circuits and interconnection are the subject for design and integration study. 7

cern.ch RF NETWORK LAYOUT The CLIC two-beam RF network includes the standard X-band rectangular waveguides connecting PETS, AS and other supplementary devices such as choke-mode flange (CMF), Hybrid, high-power load, splitter and WFM. 8 Requirements: tolerance on RF phase change between DB and MB: ± 0.12 deg WG interconnections between PETS and AS via CMF: X – shift: ± 0.25 mm, Y ± 0.5 mm, Z ± 0.5 mm, Twist: < 5 ° Waveguide length optimization is based on losses, phase advance and RF to beam timing considerations. The power transmission without electrical contact between two beams, and also MB and DB independent alignment is getting possible with CMF. The Hybrid provides the power to two adjacent AS. The RF load is attached to one of the hybrid ports to avoid the RF reflection to the corresponding PETS. The RF splitters are used to equally feed the AS. Longitudinal cut-out of CMF

cern.ch MB Quadrupole Nominal Gradient: 200 T/m Magnet aperture: Ø10 mm MB Quadrupole Nominal Gradient: 200 T/m Magnet aperture: Ø10 mm Baseline: classical electro-magnetic design (MB) IC – BPM – Vac. Chamber – Dipole – IC 9 MB: the beam pipe is attached to the magnet and must be aligned to the magnetic centre of the Quad with an accuracy better than 30 μm; transverse tolerance for pre-alignment 17 µm at 1σ; stabilization: 1nm >1Hz in vertical & 5nm >1Hz in horizontal direction at 1σ. Longitudinal cut-out of MB Quad region MB BPM res. requirement: 50nm, 10 ns choke type MB BPM res. requirement: 50nm, 10 ns choke type MB BPM DIPOLE CORRECTOR Longitudinal space constrain for BPM and Dipole corrector integration and interconnections. Qty: MB: ~ units VAC. CHAMBER

cern.ch (DB) IC – BPM – Vac. Chamber – IC 10 Drive Beam Quadrupole working gradient: T/m, current density: 4.8 A/mm 2, magnet aperture: Ø23mm Drive Beam Quadrupole working gradient: T/m, current density: 4.8 A/mm 2, magnet aperture: Ø23mm DB: The active length specified is 150 mm. The total number of quads required for both linacs is ~ In current module design the DB Quad vertical size drives the beam height. ALTERNATIVE: DB tuneable permanent magnet solution is under investigation (Cockcroft Institute)

cern.ch ALTERNATIVE DB MAGNET 11 alternative: DB tuneable permanent magnet solution is under investigation (Cockcroft Institute)

cern.ch BASELINE: - interconnected girders form a “snake system” - MB girders are not of the same length - MB Q support interrupts the MB girder - MB Q beam pipe and AS are connected by bellows BASELINE: - interconnected girders form a “snake system” - MB girders are not of the same length - MB Q support interrupts the MB girder - MB Q beam pipe and AS are connected by bellows GIRDERS & POSITIONING SYSTEM 12 requirement : yellow ref. surfaces precision - 2 μm requirement : yellow ref. surfaces precision - 2 μm Max. vertical & lateral deformation of the girders in loaded condition - 10μm The main components of both beams are supported on girders linked to one chain all along the linac. The main components of both beams are supported on girders linked to one chain all along the linac. Lab test setup. B162/R-011

cern.ch VACUUM LAYOUT A low pressure level (10 -9 mbar) is needed for keeping the good beam quality. The interconnections between main components should sustain the vacuum forces, provide an adequate electrical continuity with low impedance and remain flexible not to restrict the alignment. 13 ALTERNATIVE SOLUTION Mini-Pumps fixed directly on each structure. No lateral stress on RF structures. (study  2011) ALTERNATIVE SOLUTION Mini-Pumps fixed directly on each structure. No lateral stress on RF structures. (study  2011) MB AS-AS interconnections

cern.ch CONCLUSIONS The integration steps and model design evolution are shown below. The intermediate 3D model was used for Thermo-Mechanical simulations, which in turn helped us to identify some critical points and introduce necessary changes into the module layout. As an example, one of them is an implementation of sliding supports for RF structures, which allows minor elongation during operation. To lower longitudinal deformation an interconnection should be added between two S-AS. The inter-beam WGs were reinforced in order to reduce their bend. 14 Many issues still exist and will be addressed during TDR phase Dec-2010 Dec-2007 Dec-2009 Dec-2008

cern.ch CLIC MEETING (17-Dec-2010) THANKS FOR YOUR ATTENTION ! 15