1

Maximum heat generation areas

2

•Averaged input power (80 kW) for the whole RFQ•Peak power 800kW (duty cycle 10%)•Input power in the model 2500W

3

� Vacuum port

� Vane tips end

� Middel area

4

7mm ED, 0,5mm wall thicknes tube

Threaded zone

5

Simulation 5 image

NO symmetry

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7

Inlets

Outlets

8

● COMSOL file: RFQbuenoNuevaIdea_revisadoSOLO_RF

● FLUENT file : Simulación 2 (Idea 4)

● Vacuum conditions for electromagnetic calculations: Presssure 10-5 Pa y temperature 293 K

● Cooling fluid (water) inlet temperatura and velocity:

● Vane tips end tubes 265 K & 5m/s

● Middel area fluids 300 K & 1 m/s

● Vacuum port area fluids 300K & 1m/s

● Total surface heat flux 2440.28 W

● Tunnel ambient: 300 K, Film coef 10 W/m2K

9

● COMSOL file: RFQbuenoNuevaIdea_revisadoSOLO_RF

● FLUENT file : Simulación 3 (Idea 4)

● Vacuum conditions for electromagnetic calculations: Presssure 10-5 Pa y temperature 293 K

● Cooling fluid (water) inlet temperatura and velocity:

● Vane tips end tubes 265 K & 5m/s

● Middel area fluids 300 K & 1 m/s

● Vacuum port area fluids 293K & 2 m/s

● Total surface heat flux 2440.28 W

● Tunnel ambient: 300 K, Film coef 10 W/m2K

10

● COMSOL file: RFQbuenoNuevaIdea_revisadoSOLO_RF

● FLUENT file : Simulación 4 (Idea 4)

● Vacuum conditions for electromagnetic calculations: Presssure 10-5 Pa y temperature 293 K

● Cooling fluid (water) inlet temperatura and velocity:

● Vane tips end tubes 273 K & 5m/s

● Middel area fluids 300 K & 1 m/s

● Vacuum port area fluids : 293K & 2 m/s

● Total surface heat flux 2440.28 W

● Tunnel ambient: 300 K, Film coef 10 W/m2K

11

12

13

● COMSOL file: RFQbuenoNuevaIdea_revisadoSOLO_RF

● FLUENT file : Simulación 5 (Idea 4)

● Vacuum conditions for electromagnetic calculations: Presssure 10-5 Pa y temperature 293 K

● Cooling fluid (water) inlet temperatura and velocity:

● Vane tips end tubes 255 K & 5m/s

● Middel area fluids 290 K & 1 m/s

● Vacuum port area fluids 288K & 4 m/s

● Total surface heat flux 2440.28 W

● Tunnel ambient: 300 K, Film coef 10 W/m2K

14

Simulation 2

Simulation 3

Simulation 4

Simulation 5

● According to the solutions found, coolants different from water should be used.

● The original cooling circuit was divided in two independent different ones. This allows to control very precisely the temperature distribution in the RFQ simulations.

● Current displacement results are not satisfactory enough (bigger than expected). Could be possible to have some data from the cold model before doing more simulations?

● Is it reasonable to simulate such small displacements (<2 µm)?

● Error sources:

– Input power lost in surface. In the simulations had been considered that all the averaged input power is transformed into heat in the RFQ walls but only part of this energy will really became into surface heat.

– Data transfer between files, transferring heat flux between programs is not keeping the value of the surface integral , hence, it is necessary to rescale it and this may introduce a small error.

– Simulation software (2-5%)

– RFQ length. The model used in the simulations is 0,5 m length and is supposing length symmetry which is not entirely true.

– The slug turners has not been taking into account.