Redesign of the ATLAS VT and VJ Area

Redesign of the ATLAS VT and VJ Area for ALARA

General Principles of Radiation Protection 1) Justification any exposure of persons to ionizing radiation has to be justified 2) Limitation the personal doses have to be kept below the legal limits 3) Optimization the personal doses and collective doses have to be kept as low as reasonable achievable (ALARA) source: Heinz Vincke DGS/RP , IEFC workshop 2011, 21 - 24 March Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 2

Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 3

• Multiple manual interventions needed in VJ/VT region • Removing supports, retracting supports, opening and closing bolted UHV flanges, positioning of beam pipe etc. Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 4

• In order to minimize the radiation exposure of our team supports are being redesigned • low activation materials are used to reduce background • Already existing remote telemanipulator for the TAS • Highly limited by space constraints • Complicated accessibility (~13 m height) • Activated material (no drilling into activated structures ) Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 5

Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 6

Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 7

Technical Requirements for new VJ Cone • Lightweight with high axial stiffness, since it’s a cantilever support • Max. deflection 5 mm over 5. 2 m with 600 N on IP side! • Radiation hard • Temperature resistant (bake-out) • Compatible with currently installed structures • Allows the integration of the new LUCID detector with better access • Must eliminate the need for the VT Fixed Support • Must allow adjustment before and after the bellows of the VJ Chamber • Must allow easier Survey by having targets which can be measured from the outside of the JFC 1 shielding • No thermal expansion Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 8

Carbon fibre VJ Cone • Lower density • Lower material activation • Thermal expansion close to zero • No additional strain on the bellows • One real fixed support since the VT Fixed support will be removed • Allows adjustment/ Integration of a new LUCID further away from the TAS • Carbon fibre already widely used in radiated areas, “yellow book” contains necessary data for resins etc. Which technology to use? Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 9

Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 10

Patented Technology which implements axial fibres into filament winding Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 11

CGB Carbon Grossbauteile Gmb. H Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 12

Mae West Installation- Munich, Germany Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 13

Choosing the resin • • • Radiation hardness Low viscosity at low temperatures Curable at low temperatures (Carbon-Aluminium hybrid!) Long pot life Within the budget • Resins used for magnet insulation Source: Highly radiation-resistant vacuum impregnation resin systems for fusion magnet insulation , P. E. Fabian, N. A. Munshi, and R. J. Denis Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 14

Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 15

Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 16

EDMS: 1317812 v. 1 Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 17

Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 18

source: Vincent Hedberg, LUCID Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 19

Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 20

FEM simulations lead to new iterations of flange design Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 21

CFD Simulations (worst case scenarios, low HTC, natural convection) CFD Simulations: Gianluca Camplone, Manuel Gomez Marzoa, EN-CV-DC Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 22

CFD Simulations: Gianluca Camplone, Manuel Gomez Marzoa, EN-CV-DC Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 23

CFD Simulations: Gianluca Camplone, Manuel Gomez Marzoa, EN-CV-DC Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 24

CFD Simulations: Gianluca Camplone, Manuel Gomez Marzoa, EN-CV-DC Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 25

Patented T-Igel Technology by Teufelberger, Austria Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 26

Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 27

Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 28

Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 29

VT Retractable supports • Triangular support system which is manually retracted/elevated by turning a threaded bar • Overall 6 supports on each side • Used to position and support VT beam pipe Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 30

Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 31

Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 32

Radiation hard stepper motors • Phytron VSS 43 UHV Stepper motors • Several adjustments for radiation hardness were made: • • • Kapton insulated wires Sm. CO Magnets (Somariom-Cobalt) Radiation resistant grease for gearbox 3 M Scotchweld 2216 radiation hard glue Teflon free, glassfibre fixations within the motor 3 Stage Gear box with total of 12 n. M torque Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 33

Prototype tests have shown that the required torque is higher than expected originally: Support was tested with gearless VSS 43 Motor not sufficient Support with 2 stage gear (16: 1), 4 Nm torque Able to lift up to 10 kg on single support Final motor will have a 3 stage gear with total of 12 Nm , enough torque to easily handle the weight plus a margin for any kind of mechanical bloque, degradiation of magnet, speed etc. Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 34

Full ATLAS detector geometry in FLUKA Source: Krzysztof Zabrzycki Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 35

Results (MGy) Integrated luminosity of 330 fb-1 till 2024, Luminosity profile provided by ATLAS Source: Krzysztof Zabrzycki Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 36

Magnetic field mapping Magnetic field at r=0. 2 m and z=13 m ~ 36 -40 Gauss/ 0. 004 T Source: Masahiro Morii, Harvard Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 37

Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 38

Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 39

Motor controls and cabling Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 40

Motor controls and cabling • Phymotion system with quick connecters • Control of each 6 motors per side at the same time • Hardware mounted in a movable rack • Communication to motors via the ATLAS Wifi • Security system with mechanical stops in work Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 41

Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 42

Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 43

VJ Project VT Project Mark Antony Gallilee Raphael Vuillermet Beniamino di Girolamo Michel Raymond Erik Richards Hendrik Kos Vincent Hedberg Tatiana Klioutchnikova Marco Ciapetti Teufelberger (Austria) CGB (Germany) CTD Technologies (US) Mark Antony Gallilee Xavier Ponds Marco Ciapetti Tatiana Klioutchnikova Raphael Vuillermet Beniamino di Girolamo Michel Raymond Wiktor Byczynski Hendrik Kos Pedro Noguera Phytron (Germany) Gianluca Camplone Manuel Gomez Marzoa Vacuum, Surfaces & Coatings Group Technology Department 23 February 2021 Kaan Vatansever 44