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

2. Contents 2  Dump Design Changes  Cooling the Dump  Cooling the Air  Summary 30 August 2012EN-CV PSB Beam Dump Cooling Constraints

3. Dump Design Changes 330 August 2012EN-CV PSB Beam Dump Cooling Constraints  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.

4. Cooling the Dump 430 August 2012EN-CV PSB Beam Dump Cooling Constraints  EN-STI-TCD provide a nominal airflow of 1,800 m 3 /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.

5. Cooling the Dump 530 August 2012EN-CV PSB Beam Dump Cooling Constraints

6. Cooling the Dump 630 August 2012EN-CV PSB Beam Dump Cooling Constraints  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.

7. Cooling the Air 7  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. 30 August 2012EN-CV PSB Beam Dump Cooling Constraints

8. Cooling the Air 8  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. 30 August 2012EN-CV PSB Beam Dump Cooling Constraints

9. Summary 9  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. 30 August 2012EN-CV PSB Beam Dump Cooling Constraints