CDR2 – Coupler Mechanical Design NICOLAS MISIARA

PRELIMINARY VERSION SUMMARY 1.Requirements 2.Interfaces 1. Interface on the RFQ 2. Interface on the Test Cavity 3. Interface with the RF Transition 3.Power Coupling 4.Mechanical Design 1. Ceramic window 2. Loop 3. Cooling system 4. Monitoring 5. Qualification of the manufacturing process 5.Mechanical simulations | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION 1. REQUIREMENTS CEA IDParameterValue RFQ-L4-EMR-80 RFQ-L4-EMR-280 Max forward peak RF power coupler handling 1 MW RFQ-L4-EMR-90 RF coupler matching15dB < forward RF power ACC-EMR-VAC-060 Vacuum gauge for coupler1 per coupler RFCIC Ark detector on SMA viewport on vacuum and air side2x(1 per coupler) RFCIC-200 Electron pick-up on vacuum side of the coupler1 per coupler | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA RF design hasn’t been modified since CDR 1. Réf. 4

PRELIMINARY VERSION 2. INTERFACES 1. Interface on the RFQ 2 Couplers installed on S3 Tuners Cooling Vacuum Gauges … | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION 2. INTERFACES | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION 2. INTERFACES 2. Interfaces on the Test Cavity (vacuum side) Same interfaces as the RFQ (diameter, gap etc…) Length of the port Gap =>8.1mm | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION 2. INTERFACES 3. Interfaces with the RF Transition (air side) Identical interface for RF Transition (coupler on RFQ and Test Cavity) Standard coaxial connexion Adaptator SMS clamp to 4’’1/2 EIA (Réf. Spinner BN ) | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION 3. POWER COUPLING Coupling performed by rotating the coupler arround its rotation axis Specific flange allowing rotation without removing systematically the screws Vacuum thightness obtained with appropriate O-rings | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION 4. MECHANICAL DESIGN 1. Ceramic window Alumina 97.6% pure Réf. Al300 Wesgo (6mm thick) TiN deposition | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA Atmospheric pressure Vacuum Incident RF Power

PRELIMINARY VERSION 4. MECHANICAL DESIGN 2. Loop | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA Réf. 1 and 2 Réf. 3 Power density [W/cm 2 ] PRF = 1MW, duty cycle = 5% Coupler RF design Mean power deposition : Internal coaxial conductor : 10.3 W External coaxial conductor : 5.8 W Body : 22W RF Loop : 34.2W

PRELIMINARY VERSION 4. MECHANICAL DESIGN 2. Loop Conclusion : h = 1000 [W.m -2.K -1 ] optimal heat exchange coefficient | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA Thermally induced displacements [µm] Elevation temperature field [K] dT=16.3 [K] dl=29.8 [µm]

PRELIMINARY VERSION 4. MECHANICAL DESIGN 2. Loop Complex geometry, compliant to the simulations One « leg » concentric to the axis of the Coupler Feedback from previous tender | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION 4. MECHANICAL DESIGN 3. Cooling system Volumetric flow of water : 4L/min Pressure drop : approximately 1.2 Bars Standard Swagelok connections | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION 4. MECHANICAL DESIGN 3. Cooling system Not necessary to cool the alumina from its outter diameter Margin-taking, TBD during conditionning Volumetric flow of water : 2-3 L/min Pressure drop : approximately 0.5 Bars Standard Swagelok connections | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION 4. MECHANICAL DESIGN 4. Monitoring | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA ElementQuantity Ark Detector2 RF Pick-up1 CC Gauge1

PRELIMINARY VERSION 4. MECHANICAL DESIGN 5. Qualification of the manufacturing process Does the manufacturing process meets the requirements => performances ? Step 1 : « Prototype » RF window Machining requirements =>Dimensional tolerances (mm) =>Surface roughness : Ra 0.8 Assembling requirements =>Dimensional tolerances (mm) =>Vacuum tightness : Pa.m 3 /s He leak test RF performance =>Low level RF test before AND after TiN deposition | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION 4. MECHANICAL DESIGN 5. Qualification of the manufacturing process Step 2 : « Prototype » loop Machining requirements =>Dimensional tolerances (mm) =>Surface roughness : Ra 0.8 Assembling requirements =>Dimensional tolerances (mm) =>Vacuum tightness : Pa.m 3 /s He leak test =>Hydraulic tightness : 10 Bars pressure test | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION 4. MECHANICAL DESIGN 5. Qualification of the manufacturing process Step 3 : TiN (Titanium Nitride) deposition samples Thickness =>10nm +/- 5nm Deposition homogeneity Stoichiometric composition | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION 5. MECHANICAL SIMULATIONS 1. FE Analysis Static Structural : Coupler on the RFQ | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION 5. MECHANICAL SIMULATIONS Maximum Vertical Displacement : approximately 0.011mm | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION 5. MECHANICAL SIMULATIONS Equivalent Von-Mises Stresses : approximately 3.3MPa | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION 5. MECHANICAL SIMULATIONS 2. FE Analysis Static Structural : Coupler on the RFQ + RF Transition connexion | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION 5. MECHANICAL SIMULATIONS Maximum Vertical Displacement : approximately 0.018mm | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION 5. MECHANICAL SIMULATIONS Equivalent Von-Mises Stresses : approximately 20MPa | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION 5. MECHANICAL SIMULATIONS Equivalent Von-Mises Stresses : approximately 20MPa | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION 5. MECHANICAL SIMULATIONS Equivalent Von-Mises Stresses : approximately 20MPa (Tension and Compression) | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA

PRELIMINARY VERSION THANKS FOR YOUR ATTENTION References : 1. ESS : Report for CDR RFQ 2. ESS RFQ – RF Design A. C. FRANCE, M. DESMONS, O. PIQUET 2014/11/18 3. CEA Internal Note : Contraintes_Coupleur_RFQ_ESS (Thermal simulations) 4. RFQ Interface « L3_L4_WTRC_Vac_req_review_V18 » 2015/11/11 | PAGE /12/08 CDR2 - Mechanical Design of the Coupler – Nicolas MISIARA