TD26CC PLANS FROM CIEMAT Laura Sánchez on behalf Electrical Engineering Group of CIEMAT

Overview Previous experience on RF prototypes TBL PETS (CTF3) DOUBLE-LENGTH CLIC PETS (CTF3- CLEX) BUNCHER CAVITY (LIPAc-IFMIF) LINAC OF MICROTRON FOR CANCER THERAPY o Precision machining o Cleaning o Joining: brazing, TIG, EBW o Assembly o Testing Plans for manufacturing CLIC structures TD26CC o Ultra precision machining o Bonding Group facilities and conclusions

Scope of the collaboration on PETS SERIES PRODUCTION Fabrication Cooling circuits Waveguides/flanges Vacuum tanks Assembly & testing 3 PETS TBL-PETS DOUBLE –LENGTH CLIC PETS TBL-PETS PROTOTYPING Engineering design. Manufacturing Joining Assembly. Low power RF Tests.

Other RF prototypes BUNCHER FULL R&D: RF, thermal and mechanical design Manufacturing and Joining Assembly. Low power RF Tests. High power tests (ALBA) First RF cavity entirely developed by a Spanish Group MICROTRON PROTOYIPING RF and thermal design Engineering design Manufacturing Joining: brazing (CERN) Low power testing

Precision Machining: DOUBLE-LENGTH PETS High speed milling 2 Stress relieve HT 1 h 180ºC Diamond tools All dimensions within tolerances 80 regular cells 532 mm long OFE Cu Tight tolerances ± 15 μm Ra < 0.4 μm Monocrystal Diamond Tolerances Beam hole ± 10 μm Choke ± 15 μm Waveguides ± 20 μm RF surf Ra < 0.3 μm Compact Couplers Bars

Thermal cycle waveguides at ITP Precision Joining: Vacuum Brazing TBL PETS WorkshopPartJoint Filler alloy Brazing temp (ºC) temp (ºC) Vacuum (mbar) CERNCouplerCu/Cu 68.5 Ag/26.5 Cu/5Pd ≈ < 10-5 AIMEN (SP)WaveguideCu/SS82 Au/18 Ni980 < 10-4 AIMENCoolingCu/(Ni)SS 68.5 Ag/26.5 Cu/5Pd 815 < 10-4 ITP (SP)WaveguideCu/(Ni)SS 68.5 Ag/26.5 Cu/5Pd 815 < 10-5 ITPCoolingCu/(Ni)SS 68.5 Ag/26.5 Cu/5Pd 815< 10-5

DOUBLE-LENGTH PETS COMPACT COUPLERS Brazing Step Type of joints Filler alloy (%wt) Filler melting range (ºC) Vacuum (mbar) First Cu/Cu Cu/SS (unplated) 58Ag/32Cu/10Pd <10 -6 SecondCu/SS (unplated)68.5 Ag/26.5 Cu/5Pd <10 -6 Workshop: Ecor Research (IT) BUNCHER INPUT COUPLER Brazing Step Type of joints Filler alloy (%wt) Filler melting range (ºC) Vacuum (mbar) First Cu/Alumina (metallized) 68.5 Ag/26.5 Cu/5Pd <10 -6 SecondCu/Cu70Ag/30Cu780<10 -6 Workshop: Ecor Research (IT)

Precision Assembly: Double-Length PETS: rods positioning before EBW Auxiliary discs, rings and supports. Centering rings 50.05/50.00 mm Measuring bars position Adjusting bars position Bars positioning TBL PETS: structure assembly Dowel pins, rings, supports. Bars positioning Coupler positioning Bars inside the tank Base

Low power RF Tests (I) S Parameters Antenna Transmission Method PETS

Low power RF Tests (II): Bead Pull Method Double-Length PETS Buncher cavity Microtron LINAC

Plans for CLIC structures: TD26CC Tuning at CERN Disc machining Parts machining Bonding Brazing Leak testing Assembly CIEMAT will manufacture a TD26CC structure according CERN procedures Scope of the collaboration

Ultra-precision machining: Discs PETS bar CLIC structure disc Tolerances 10 times tighter Challenging step for CIEMAT MACHINING COMPANY Needed to revise tolerances CostsTime

Precision Joining: Bonding Technique not used before at CIEMAT Previous tests as similar as possible to CERN experience Pressure (weight) Temperature H 2 pressure Time Depending on the final roughness and flatness of the bonding surface Bonding furnace High vacuum 15 mbar H 2 Mo chamber Adjusting bonding parameters Courtesy Ecor Research

CIEMAT facilities Equipment for assembly Clean room Granites Measuring machines Equipment for testing Network analyzers Leak detectors Materials division at CIEMAT Optical microscopy Electronic microscopy Atomic force microscopy

Summary & Conclusions CIEMAT o Precision machining of copper pieces o Dimensional control procedures o Precision joining o Assembly o RF low power testing Companies o DMP (SP) o Qualified by CERN for CLIC discs machining o LEITZ INFINITY Coordinate measuring machine o Ecor Research (IT) o vacuum brazing o Tecnalia (SP) o vacuum brazing o bonding o hot pressing We are ready to start the production of a TD26CC accelerating structure

Thank you for your attention