AMI MASCHINENBAU-KOLLOQUIUM

Transcription

1 AMI MASCHINENBAU-KOLLOQUIUM Kavitäten Komponenten die beschleunigen - Mechanische Konstruktion -Simulation - Fertigung Markus Bopp, Sektion HF

2 Einige Kavitäten am PSI 150 MHz Resonator, Injektor GHz supraleitende Kavität, SLS 50 MHz Resonator, Inj MHz Kavität, Ring Neue 50 MHz Cu- Kavität, Ring 500 MHz Kavität, SLS

3 Grundprinzip der Beschleunigung Vakuum P + Kavität + 1eV 1 V 1eV = E-19 J durchl. Spannung [V] v Proton relativistisch [m/s] v / co relativistisch [-] m / mo Injektor Ring [-] F = Q * E; W = Q * E * s

4 Spannungsverteilung in der Ring-Kavität H L B 50 MHz Alu-Kavität, Ring

5 590 MeV Ring Cyclotron

6 590 MeV Ring Cyclotron - 8 Sector Magnets 1 T - 4 Accelerator Cavities 730 kv - Injection energy: 72 MeV - Extraction energy: 590 MeV - Accelerator frequency: MHz - Beam current: 1.85 ma - Commissioned: 1974

7 590 MeV Ring Cyclotron - 8 Sector Magnets 1 T - 4 Accelerator Cavities 730 kv - Injection energy: 72 MeV - Extraction energy: 590 MeV - Accelerator frequency: MHz - Beam current: 1.85 ma - Commissioned: 1974

8 The New 50 MHz Ring Cyclotron Cavity Specification Resonance frequency: Accelerating voltage: Dissipated power: Tuning range: Cavity wall: Support structure: Vacuum pressure: Cooling water flow: Dimension: Weight: MHz 1.4 MV 500 kw 540 khz Cu-OFHC 316LN 1e-6 mbar 34 m3/h 5.6x3.9x0.95 m 25'000 kg

9 HF-Verstärkerkette Verstärkerstufe, 1 x 1 x 3m, 1.5 t Regelung, 1kW, 10kW 800 kw Verstärkerstufe

10 Kühlung Kühlanlage, 3 MW

11 Vakuum und Hydraulik Vakuumpumpstand an Cu-Kavität Hydraulikanlage, Tuning Druck max. 70 bar

12 alte Alu-Kavität Neue Cu-Kavität m Strahlebene Strahlspalt 50 MHz Alu-Kavität, Ring Neue 50 MHz Cu- Kavität, Ring

13 Hydraulic tuning yokes Beam plane Support structure RF-Volume

14 Cavity shell Cooling channels RF-Port Beam slit Vacuum port Cooling water outlet Cooling water inlet

15 Inside the Cavity Coupling loop

16 Simulation (ANSYS-Multiphysics) - Inner dimensions of the cavity (vacuum volume)? - Frequency drift (thermal, atmospheric pressure)? - Temperature distribution? - Tuning Range? - Effect of manufacturing tolerances?

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28 3D-Models RF-Model Mechanical / Thermal Model 20 Node Brick Element (HF120) Nodes Elements 8 Node Brick Element (Solid45/Solid70) Nodes Elements

29 Coupled Field Analysis RF-Simulation (Modal) - undeformed RF-Geometry - H- and E-Field - Resonance Frequency - Q-Value

30 Heatflux distribution scaled to 500 kw Magnetic field

31 Coupled Field Analysis RF-Simulation (Modal) - undeformed RF-Geometry Thermal-Simulation - heat flux - forced convection (cooling) - natural convection/ambient temperature) - H- and E-Field - Resonance Frequency - Q-Value - Temperature distribution

32 Temperature 500 kw dissipated RF-power

33 Coupled Field Analysis RF-Simulation (Modal) - undeformed RF-Geometry Thermal-Simulation - heat flux - forced convection (cooling) - natural convection/ambient temperature) - H- and E-Field - Resonance Frequency - Q-Value - Temperature distribution Structural-Simulation - results from thermal simulation - atmospheric pressure - hydraulic tuning forces - Deformation - Stress

34 Deformed RF-Model Deformed mech. Model

35 Coupled Field Analysis RF-Simulation (Modal) - undeformed RF-Geometry Thermal-Simulation - heat flux - forced convection (cooling) - natural convection/ambient temperature) - H- and E-Field - Resonance Frequency - Q-Value - Temperature distribution Structural-Simulation - results from thermal simulation - atmospheric pressure - hydraulic tuning forces RF-Simulation (Modal) - deformed RF-Geometry - Deformation - Stress - Frequency drift - H- and E-Field - Resonance Frequency - Q-Value

36 Fertigung - Masshaltigkeit (Frequenz) - Dichtigkeit (Vakuum) - Oberflächenbeschaffenheit (Verluste, Vakuum, Hochspannung)

37 Lieferant SDMS La chaudronnerie blanche ZI Les Condamines BP Saint-Romans France

38 Support Structure - 316LN

39 Tuning yokes - 316LN

40 Electron Beam Welding EB-Weld

41 TIG-Brazing Copper / Stainless Steel CuAl8 - Filler Material Cu-OFHC 316LN

42 Cu-Welding Front/End-Plate Cu-OFHC

43 Cooling Channels 316LN CuAl8 (Filler Material) Cu-OFHC

44 Cold Tests PAUL SCHERRER INSTITUT Frequency? Q-Value? Tuning range? Hydraulic unit

45 Cold test of the cavity cooling system Flow rate = 34m 3 /h

46 Vacuum test PAUL SCHERRER INSTITUT Pressure <= 1e-6 mbar Leak rate <= 1e-6 mbar*l/s

47 Site Acceptance Test 24h Test run

48 Case Simulation Measured Ambient conditions f MHz Ambient Temp. 25 C MHz Ambient Temp. 18 C Q Vacuum f MHz Ambient air 1000 mbar; 25 C MHz Ambient Air 975 mbar; 18 C Q Tuning range f 536 khz 548 khz Thermal Drift f -96 khz Ambient Temp. 25 C -64 khz Ambient Temp. 31 C

49 Abstimmbereich (Messung bei SDMS) Hydraulik: ~ 8 khz / bar Luftdruckschwankungen: ~ 670 Hz / mbar 50.8 MHz Weg: ~ 34 khz / mm (in Strahlebene) ~ 35 khz / mm (bei Wegaufnehmer mittlerer Hydraulikbügel) ~ 58 khz / mm (bei Wegaufnehmer äusserer Hydraulikbügel) bar

50 Installed in the Ring Cyclotron, January 2004

51 Nächste Kavitäten - 50 MHz Cu-Kavitäten, Ring, 3 Stück, Fertigung MHz Buncher, zw. Inj. 2 und Ring, Fertigung - 50 MHz Resonator für Injektor 2, in Planung GHz HF-Kanone, LEG-Projekt, in Planung MHz Buncher, in 870 kev-linie, in Planung

52 500 MHz Buncher, zw. Inj. 2 und Ring mm Resonance frequency: Gap voltage: Dissipated power: Cavity wall: MHz 218 kv 30 kw Cu-OFHC

53 50 MHz Resonator für Injektor 2 Resonance frequency: Gap voltage: Dissipated power: Cavity wall: 50.6 MHz 500 kv 120 kw Alu m Injektor 2, Resonator 4

54 1.5 GHz HF-Kanone für LEG-Projekt f: 1.5 GHz Vc: 40 MV/m P: 10 MW (gepulst 4μs, f rep 10Hz) Werkstoff: Cu-OFHC Vakuum: UHV mm

55 150 MHz Buncher, 870 kev-linie mm f: 150 MHz Vc: 3.0 kv P: 10 W Werkstoff: Cu-OFHC

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60 Mechanical Model Deformation under hydraulic tuning forces