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PSB Beam Dump Cooling Constraints

PSB Beam Dump Cooling Constraints. Glen Mason EN-CV. 30 August 2012. Contents. Dump Design Changes Cooling the Dump Cooling the Air Summary. Dump Design Changes. Reduction in Dump Heat Load: New 2GeV dump has reduced from 27 kW in the initial design down to 9.4 kW.

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PSB Beam Dump Cooling Constraints

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  1. PSB Beam DumpCooling Constraints Glen Mason EN-CV 30 August 2012

  2. Contents • Dump Design Changes • Cooling the Dump • Cooling the Air • Summary EN-CV PSB Beam Dump Cooling Constraints

  3. Dump Design Changes • Reduction in Dump Heat Load: • New 2GeV dump has reduced from 27 kW in the initial design down to 9.4 kW. • But! less than 3.8 kW while1.4 GeV. • Water-cooling or Air-cooling? • RP much prefer air-cooling as air density << water and the half-lives of the isotopes produced are shorter, • CV prefer water-cooling - smaller size, existing infrastructure, • Preliminary dump design indicated that air-cooling would be feasible for the new dump. EN-CV PSB Beam Dump Cooling Constraints

  4. Cooling the Dump • EN-STI-TCD provide a nominal airflow of 1,800 m3/hr. • Air Handling Unit (filter & fan only) • Suspended from the tunnel soffit? • Approx. 600 W x 600 H x 900 L • Ductwork ~ 350 x 300 mm. • Provide channels in the shielding to duct air to the rear of the dump and allow it to flow back out over the core • Set the dump forward to form a plenum, say 300 mm. EN-CV PSB Beam Dump Cooling Constraints 30 August 2012

  5. Cooling the Dump EN-CV PSB Beam Dump Cooling Constraints

  6. Cooling the Dump • Maintenance of equipment placed in the tunnel is always a big concern for CV. • Identify a location for the AHU, possibly ducted in from somewhere more accessible. • The design of the dump will need to keep in check with the design of the cooling system: • The pressure drop needs to be kept to a realistic value of <200-300 Pa so we can specify low fan speeds for higher reliability. • Redundancy will need to be considered: • Twin fan/motor units will provide 60-70% airflow redundancy, • Spare units may be space prohibitive. EN-CV PSB Beam Dump Cooling Constraints 30 August 2012

  7. Cooling the Air • The additional heat is released into the tunnel and must be managed by the existing ventilation system. • The ventilation system is poorly documented and difficult to estimate the available capacity. EN-CV PSB Beam Dump Cooling Constraints

  8. Cooling the Air • However, until LS2 we do not expect a huge increase in heat from the dump over existing levels: • Current dump understood to be 2-3 kW, • Only 3.8 kW until after LS2. • The PSB ventilation system is scheduled for replacement during LS2, in time for the 2GeV upgrade and the higher heat load. • We will verify maintenance records in the PSB tunnel to ensure there is not a major problem with this assumption. EN-CV PSB Beam Dump Cooling Constraints

  9. Summary • The dump can be air-cooled to prevent RP issues associated with water-cooling. • We need a location for the AHU. • The new dump should be able to reject heat to the tunnel between LS1 and LS2 without any modification to the ventilation. • I’m done, any questions? • Yes, we CV folk still prefer water-cooling. EN-CV PSB Beam Dump Cooling Constraints

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