Ongoing Design Work BGC Collaboration Meeting 27 11

Ongoing Design Work BGC Collaboration Meeting – 27. 11. 2018 27/11/2018 ONGOING DESIGN WORK TOM DODINGTON - JOHANNA GLUTTING 1

Content § ECR § Fixed nozzle changes § Chamber minimizations § Skimmer chamber § Nozzle chamber (2 options) § Dumpside elbow 27/11/2018 ONGOING DESIGN WORK TOM DODINGTON - JOHANNA GLUTTING 2

BGC assembly V 2 Skimmer chamber Skimmer assembly Nozzle chamber Gas separator Optics Third skimmer Interaction chamber Movable gauge chamber Skimmer assembly Dump chamber First skimmer holder – fixed to chamber Second skimmer holder Nozzle holder nozzle First skimmer Second skimmer 27/11/2018 ONGOING DESIGN WORK TOM DODINGTON - JOHANNA GLUTTING 3

ECR Summary § BGC ECR is split into two parts • Stage 1 – Interaction chamber • Stage 2 – Gas generation, pumping, and optical system. § Stage 1 of the ECR has been approved at LHC Machine Committee (LMC) § Installation proposed on LHC Beam 1 (internal) at B 5 L 4. B 27/11/2018 ONGOING DESIGN WORK TOM DODINGTON - JOHANNA GLUTTING 4

Main Features of the design § 3 all-metal gate valves to isolate beam pipe. § Copper RF liner, with slits to allow efficient pumping § Additional flanges for: • Optics • Pressure gauges • Alignment target § Geometers in Survey zone 27/11/2018 ONGOING DESIGN WORK TOM DODINGTON - JOHANNA GLUTTING 5

27/11/2018 ONGOING DESIGN WORK TOM DODINGTON - JOHANNA GLUTTING 6

Vacuum Sectorisation 27/11/2018 ONGOING DESIGN WORK TOM DODINGTON - JOHANNA GLUTTING 7

Vacuum Sectorisation 27/11/2018 ONGOING DESIGN WORK TOM DODINGTON - JOHANNA GLUTTING 8

Skimmer Assembly – Fixed Nozzle new assembly § Same alignment principle as current design =fixed first skimmer, alignment by moving the nozzle and second skimmer holder § New adapters for skimmers, for easier and safer handling § Adapter for nozzle (yellow disk) Current assembly 27/11/2018 ONGOING DESIGN WORK TOM DODINGTON - JOHANNA GLUTTING 9

Skimmer Chambers Minimization § § § 27/11/2018 2 x DN 100 flange 1 x DN 150 flange 1 x DN 60 flange Dimensions: 270 x 250 mm Pump after first and second skimmer are opposed ONGOING DESIGN WORK TOM DODINGTON - JOHANNA GLUTTING 10

Nozzle Chamber Minimization (option 1) § Gas inlet in flow axis § Flange of connector tube (red) with sealing on the outer diameter and screws on the inner diameter § Bellow to disconnect nozzle from mechanical stresses Nozzle chamber Skimmer chamber Gas inlet 140 27/11/2018 ONGOING DESIGN WORK 190 TOM DODINGTON - JOHANNA GLUTTING 260 11

90° built in (option 1) Survey zone § Possible with 14 mm gap to transport area § Optics have to be on the bottom side Outer beam pipe Optics 27/11/2018 Transport zone Metal gate valves ONGOING DESIGN WORK Weight of assembly on right valve: ≈45 kg Suport necessary? TOM DODINGTON - JOHANNA GLUTTING 12

Nozzle Chamber Minimization (option 2) § Radial gas supply § Window flange under high pressure § 160 mm shorter than version 1 170 27/11/2018 ONGOING DESIGN WORK TOM DODINGTON - JOHANNA GLUTTING 260 13

Elbow options tube cross section two tubes welded together reflection plate offsets and tilted pumps lead to eaven more versions 27/11/2018 ONGOING DESIGN WORK TOM DODINGTON - JOHANNA GLUTTING 15

Adapter for CD Nozzle § Design compatible with current design at CI § Adapter for Nozzle can be suited for different nozzle length 27/11/2018 ONGOING DESIGN WORK TOM DODINGTON - JOHANNA GLUTTING 16

Scheme of the Developed Alignment Setup irises, one with 2 linear degrees of freedom laser with 2 linear and 2 rotational degrees of x freedom nozzle holder 2 nd skimmer holder x y ONGOING DESIGN WORK camera with 3 linear degrees of freedom x y alignment frame 27/11/2018 1 st skimmer holder adjustment screws integrated in the frame TOM DODINGTON - JOHANNA GLUTTING y z z focus of the camera with linear stages 17

Alignment Concept Installation of the equipment Alignment of the laser to the nozzle (with the iris system) ▪ Maximization of the laser intensity Alignment targets in the focal planes of nozzle 1 st and 2 nd skimmer (laser is reference) Alignment of the nozzle and skimmers 27/11/2018 ONGOING DESIGN WORK TOM DODINGTON - JOHANNA GLUTTING 18