NuMI NuMI Target Hall Air System Review Introduction July 30, 2003 Jim Hylen / FNAL Page 1 NuMI Target Hall Air System Review Introduction Air system for cooling target pile Requirements: Provide thermal stability to keep beam components aligned Prevent materials from overheating Provide reasonable pile thermal cool-down time for servicing Minimize radioactivated air release (re-circulating) Keep humidity low to reduce corrosion What motivated us to adopt air system? Cooling must equal beam heating – target hall is like brick oven Air system maintenance items are external to pile (as opposed to e.g. cooling coils) so ALARA is easier Extended volume, many things to cool – air is reasonably simple Where was air system insufficient, and water cooling used? Horn conductor cooling Target fin cooling Hanger/clamp from module to horn (and module to target carrier)

NuMI NuMI Target Hall Air System Review Introduction July 30, 2003 Jim Hylen / FNAL Page 2 Where does 400 kW of proton beam energy go? 18 kW in target/horn water cooling 129 kW / 141 kW (L.E. / M.E. focus) in rest of target pile -> air system 150 kW / 132 kW in decay region 60 kW in hadron absorber (rest of energy in nuclear binding energy, muons, neutrinos) Used 158 kW in specification for air system

NuMI NuMI Target Hall Air System Review Introduction July 30, 2003 Jim Hylen / FNAL Page 3 Target Hall Side View Layout Air Path

NuMI NuMI Target Hall Air System Review Introduction July 30, 2003 Jim Hylen / FNAL Page 4 NuMI Target Hall beam’s eye view Horn+Module in transit Stripline Concrete Cover (oops – really only one layer) “Carriage” - Module Support Beams Horn Shielding Module Horn Steel Shielding Air returns down center of beam-line Concrete Shielding Top air seal Air from chiller runs down outside of pile

NuMI NuMI Target Hall Air System Review Introduction July 30, 2003 Jim Hylen / FNAL Page 5 Target Pile Cutaway

NuMI NuMI Target Hall Air System Review Introduction July 30, 2003 Jim Hylen / FNAL Page 6 Target / Baffle component and its support module Drive motors Baffle Target Coiled water, vacuum lines Module T/B Carrier

NuMI NuMI Target Hall Air System Review Introduction July 30, 2003 Jim Hylen / FNAL Page 7 Horn, stripline, and support module – and target/baffle Water tank Stripline Remote Stripline Clamp Baffle Target Target/Baffle Module Horn 1 Module Horn 1 25 cm wide, 2 m deep Steel endwalls with positioning, water, electric feedthroughs Motor drives for transverse and vertical motion of carrier relative to module Carrier Target moves relative to carrier for insertion into horn for Low Energy beam, and back for Semi-Medium Energy beam

NuMI NuMI Target Hall Air System Review Introduction July 30, 2003 Jim Hylen / FNAL Page 8 Target Hall Layout pre-target beamline target hall drop hatch to pre-target hot work cell Drop-shaft from surface power supply RAW water for horn utility room target pile re-circulating air cooling system Compressor Cooling coils

NuMI NuMI Target Hall Air System Review Introduction July 30, 2003 Jim Hylen / FNAL Page 9 Target Hall Closed Loop Air Conditioning Filters Survey hole in duct for sight riser Blower Duct Sight riser Chiller coils 27 ft Plan View Side Views 26,000 cfm air flow 240 kW of cooling for spec. 158 kW beam heating of pile 18 mph wind in beam channel

NuMI NuMI Target Hall Air System Review Introduction July 30, 2003 Jim Hylen / FNAL Page 10 Thermal Stability Concept

NuMI NuMI Target Hall Air System Review Introduction July 30, 2003 Jim Hylen / FNAL Page 11 Air-flow down module wall keeps module end-wall cool Air flow supply T-block shielding Module end-wall Stripline Air flow return Horn Shower from one beam proton

NuMI NuMI Target Hall Air System Review Introduction July 30, 2003 Jim Hylen / FNAL Page 12 Air Cooling System Thermal model of horn 1 module end-plate in target pile (left half of symmetric target hall) Closed loop air recirculating system Cool air flow upstream on outside of pile Then downstream inside target chase Module at comfortable 66 deg C Module motors less than 40 deg C

NuMI NuMI Target Hall Air System Review Introduction July 30, 2003 Jim Hylen / FNAL Page 13 But thermal stability motivated water-cooled horn clamps Horn vertical centerline

NuMI NuMI Target Hall Air System Review Introduction July 30, 2003 Jim Hylen / FNAL Page 14 Horn Power Stripline Cooling - air is sufficient Aluminum stripline reaches 100 deg C with air at 13 deg C

NuMI NuMI Target Hall Air System Review Introduction July 30, 2003 Jim Hylen / FNAL Page 15 Rest of items in beam spray Have also checked (or designed such) that air cooling is sufficient for: Horn alignment cross hair Target carrier rails, frame Target casing (requires He fill instead of vacuum) Baffle Decay pipe window Have not checked BLM for horn cross hair system but believe this will be OK, (only used occasionally at low intensity, could be removed for hot runs)

NuMI NuMI Target Hall Air System Review Introduction July 30, 2003 Jim Hylen / FNAL Page 16 Purpose of review This is the final review of the air system before ordering compressor, chiller coils, filter bank, blower, controls, instrumentation, etc. The primary purpose of this review is to catch any mistakes in the engineering design of the air system. The secondary purpose is to communicate the design to other stakeholders who may have integration issues. Radiation issues are being separately reviewed, and are not really in the scope of today’s review.