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Heat Flux [Wm -2 ]

Heat Flux [Wm -2 ]. Heat Transfer Coefficient [Wm -2 K -1 ]. Temperature [°C]. Cooling Properties By Region. Squirt Nozzle. In RFQ Sections 1 & 4 only Designed for high flow velocity (5ms -1 ) for higher cooling at vane ends

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Heat Flux [Wm -2 ]

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  1. Heat Flux [Wm-2]

  2. Heat Transfer Coefficient [Wm-2K-1]

  3. Temperature [°C]

  4. Cooling Properties By Region

  5. Squirt Nozzle • In RFQ Sections 1 & 4 only • Designed for high flow velocity (5ms-1) for higher cooling at vane ends • In same cooling circuit as major and minor end pockets (i.e. not separately flow controlled) • 3mm pipe diameter constricts flow. Pushes up required pressure in those pockets to ~0.3 Bar

  6. Water Temperature Rise The re-circulating path of the pocket flow channel causes a water temperature rise of 5°C

  7. Conclusions • 50kW heat load  125 Wcm-1 • With described cooling: -100kHz frequency shift • 2-4 L/min rates throughout • Need separate control for minor vane centre pockets and vacuum port cooling • Highest flow in end wall and vac-pump port • 5°C water temperature rise is fine • Squirt nozzle  higher pressure in end pockets

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