Wideband kickers Mechanical design and Fabrication Eric Montesinos

Wideband kickers Mechanical design and Fabrication Eric Montesinos, Sébastien Calvo on behalf of all teams involved eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva

Outlook Strip Line Kickers Slot Line kicker Resources and Timeline Strip Line Kickers Slot Line kicker Conclusion eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva 3/25

Resources and Timeline 2014 2015 2016 2017 2018 Débora Aguilera Strip Line kicker EM simulations Mechanical Design 1 Prototype Fabrication 1 Prototype Installation SPS 2 + 1 Series Fabrication 2 Series Installation in SPS 1 Spare in Lab Sébastien, Jean, Jarmo, Débora, and the two first Strip Line Kickers installed in the SPS eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva 4/25

Resources and Timeline 2014 2015 Débora Aguilera 2016 2017 2018 Irene Alonso Strip Line kicker Slot Line kicker Preliminary studies EM simulations Mechanical Design Prototype for lab measurements (atmospheric) Prototype for lab measurements (vacuum) 1 + 1 Series Fabrication 1 Installation in SPS during YETS 2017 -2018 1 spare in Lab eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva 5/25

Strip Line Kickers, Mechanical design, Fabrication & Installation Pumping port shielding Kickers Alignment system Specific bellow Kickers Standard bellow Vacuum pipe at the size of the future Slot line Kicker Supporting system eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva 6/25

Strip Line Kickers, Mechanical design, Fabrication & Installation Feedthroughs (Kovar) Body (Stainless Steel) Strip Line Kicker Electrodes (Cu OFE) eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva 7/25

Strip Line Kickers, Mechanical design, Fabrication & Installation: Feedthroughs Five suppliers were contacted Kyocera SST MDC vacuum products Neyco Offers were rejected by the companies due to SCT an inability to reach the initial requirements It took more than ten months to receive, test and qualify the feedthroughs Temperature test Temperature shock test (water bath & heat gun) Traction and compression test Vacuum leak test 7/16 DIN connector (preferred) 50 Ω 0 – 1 GHz 5 k. W DN 40 CF flange Conical shape Final diameter 5 mm Only Kyocera was qualified eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva 8/25

Strip Line Kickers, Mechanical design, Fabrication & Installation: Feedthroughs eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva 9/25

Strip Line Kickers, Mechanical design, Fabrication & Installation: Electrodes Specific shape provided by simulations Cu OFE electrode Copper OFE for high thermal conductivity Machined from a massive copper block due to the complex shape Conical shape of the feedthrough, smooth transition to avoid sharp edge at the point where the feedthrough joins the electrode eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva 10/25

Strip Line Kickers, Mechanical design, Fabrication & Installation: Body All in one machined, including two vacuum chamber flanges and four feedthrough ports Strip Line kicker Body 316 LN 3 D forged stainless steel for good vacuum knives Vacuum leak tested (less than 1 x 10 -10 mbar l / s) Electro polishing to improve inner surface finish (including tooling) Tooling system for electro polishing eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva 11/25

Strip Line Kickers, Mechanical design, Fabrication & Installation The two strip line kickers installed in the SPS 12/25

Strip Line Kickers, Mechanical design, Fabrication & Installation: conclusion Many processes have been qualified, that will all be useful for the next slot line kickers Isolated and universal regardless the orientation supports Specific supporting system to allow individual alignment, with one parallel support, two intermediate supports, two adaptors and three feet Body machined such that a Taylor Hobson sphere can be adapted to allow an easy positioning of the kickers (position of electrodes in reference to Taylor Hobson spheres) RF wire test, including the construction of all the necessary tooling Peripheral items constructed, pumping port shielding, bellows, enamelled flanges, vacuum chambers, … Qualification processes conducted, metrology, cleaning, outgassing analysis, vacuum leak detection, residual gas analysis, aperture and impedance simulations (horizontal/vertical) eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva 13/25

Slot Line Kickers, Mechanical design, Fabrication & Installation Slot Line kicker eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva 14/25

Slot Line Kickers, Mechanical design, Fabrication & Installation 90º step transition We did several initial studies including 90º step transition Lateral feedthroughs 90º tapered transition (preferred one from mechanical point of view) Lateral feedthroughs 90º tapered transition eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva 15/25

Slot Line Kickers, Mechanical design, Fabrication & Installation Feedthroughs Top cover Electrode Spacers (Copper) Body (316 Ln) (Cu OFE) (Shapal®) (316 Ln) SPS vacuum DN 159 flange Weight 367 kg Length 1422 mm Supporting system eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva 16/25

Slot Line Kickers, Mechanical design, Fabrication & Installation The kicker was designed with One body two half shells EBW two SPS flanges TIG welded Two vacuum seals Two covers Two electrodes 2 x four Shapal® spacers Four feedthroughs eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva Sketch of the slot line kicker 17/25

Slot Line Kickers, Body The body was found very difficult to be built in one single item We decided to built it by two half shells It includes vacuum CF knife and RF contact For those reasons it will be made in Stainless Steal 316 Ln The two half Shells will be EBW (mock -ups under construction to prove the feasibility, internal roughness induced by EBW, tilt over a length of 1. 5 meter !) eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva Two half shells with openings 18/25

Slot Line Kickers, Body Outgassing holes along the RF contact The body was found very difficult to be built in one single item We decided to built it by two half shells It includes vacuum CF knife and RF contact For those reasons it will be made in Stainless Steal 316 Ln The two half Shells will be EBW (mock -ups under construction to prove the feasibility, internal roughness induced by EBW, tilt over a length of 1. 5 meter !) eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva RF contact and CF knife EBW fully penetrant for internal roughness test 19/25

Slot Line Kickers, Body With the EBW body, we will add two standard SPS vacuum flanges EBW body and CF flanges Those will be TIG welded from the internal surface by hands (too complex geometry for an automated EBW) We also designed a copper seal, it is laser cut from a copper sheet RF contact and CF knife + copper seal eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva Fully welded body and Copper seal 20/25

Slot Line Kickers, Covers, Feedthroughs We designed the covers as we designed the body, with CF knife Two covers Toon Roggen did thermal simulations that showed the feedthroughs must extract quite some heat https: //cds. cern. ch/record/2214967? ln= en The feedthroughs are the ones we designed for the strip line kicker, except the inner line that is in plain copper to help removing the heat load (six feedthroughs were already delivered to cern and were vacuum leak tested) Thermal simulation of the feedthroughs, left in stainless steel, too hot, middle in copper, ok, right sketch of the feedthrough eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva 21/25

Slot Line Kickers, Electrodes Cu OFE electrode The electrode will be machined from a massive piece of Cu OFE There will be four Shapal® spacers that will ensure two functions Mechanical positioning of the electrode Thermal bridge to the cover eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva Shapal® spacers 22/25

Slot Line Kickers, Electrodes Taking into account the experience with the strip line kicker a supporting system that also allows alignment has been designed On request, it could easily be isolated by simple foil of Kapton® Due to the weight of the overall system (367 kg) a specific transport tool is also under study Supporting system eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva 23/25

Slot Line Kickers, next steps 2014 2015 Slot Line 2016 2017 2018 Slot Line kicker Preliminary studies EM simulations Mechanical Design Prototype for lab measurements (atmospheric) Prototype for lab measurements (vacuum) 1 + 1 Series Fabrication 1 Installation in SPS during YETS 2017 -2018 1 spare in Lab eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva 24/25

Conclusion: on track eric. montesinos@cern. ch, LIU-SPS Wideband Feedback Review, 20 -21 September 2016, CERN, Geneva 25/25