Contents Jason Tarrant STFC Aim of Presentation to

Contents Jason Tarrant STFC Aim of Presentation to show: l l l Problem of compressors located at south shield wall Description of compressor layout and services routing at west wall Work involved 1

Current Compressor Location Water and power services already installed for compressors South shield wall Current Proposed Compressor Position Under South Mezzanine 2

Magnetic Field Analysis 300 Step IV 250 |B| field (Gauss) 200 -10000 150 100 50 0 -5000 0 5000 10000 Z -location along beamline (mm) 15000 Level requires 5 mm Fe / 1 mm mumetal shielding 600 Step VI 500 400 |B| field (Gauss) 300 -10000 200 100 0 -5000 0 5000 10000 Z -location along beamline (mm) Magnetic Field Plots for Step IV & VI Around South Shield Wall Area (V Bayliss CM 33) 3 15000

Magnetic Shielding of Compressor Labyrinth cable entry/exit 5 mm Iron + 1 mm mumetal Only suitable for Step IV at west end of the South Mezzanine, Step VI magnetic field too strong Compressor £ 11, 500 – £ 13, 000 each! 19 Compressors (IV) = £ 218 k (~$350 k) min. Magnetic Shielding Cabinet for Compressor as South Shield Wall Location 4

Current West Wall Layout West End Stairs North Mezzanine Services all We W st Distribution Panel Current West Wall Configuration 5

Current West Wall Layout Potterax Door Assembly & Preparation Area Spectrometer Solenoid with Tandem Lifting Beam (at crane extent) Installation Path Beam dump Area at West Wall for Device Assembly & Preparation 6

Proposed Compressor Layout Compressor spacing allows ‘transplant’ of existing services to west wall with minimum of reconfiguration or manufacture of new services runs Provisional West Wall Compressor Layout (J Webb) 7

Compressor Line Routing Different Routing Layouts l l l 8 Cryomech 40 m (purple) / Sumitomo 30 m (yellow). Adv = Only 4 x Sumitomos crossing main assembly area. Disadv = 4 x Sumitomos crossing assembly area. Cryomechs at 40 m (30 m max w/o losses). Hoses connected on north side in way of moving platforms (hence alternative red hoses shown). Cryomech 35 m (green) / Sumitomo 30 m (yellow). Adv = Cryomech hoses closer to 30 m. Disadv = Most hoses cross assembly area, require false floor. Cryomech 30 m(black) / Sumitomo 30 m (white). Adv = Cryomech & Sumitomo at preferred length. They are not routed across the assembly area. Disadv = Cryomech hoses will have to form bridge over ‘landing’ just inside Potterax door. Full West Mezzanine required to move 6 Step IV compressors to south side.

Proposed Step IV Scheme West wall mezzanine Cryomech hose for device cryo (max 28. 5 m) Services bridge Sumitomo hose for Tracker cryo (max 28. 5 m) Proposal for Step IV Compressor Layout at West Wall 9 Alternative position for stairs

Proposed Step IV Scheme DEVICES WILL NEED TO BE ROLLED INTO HALL PAST SERVICES BRIDGE UPON DELIVERY BEAM DUMP SPECTROMETER SOLENOID AND TANDEM LIFTING FRAME STAIRS NEED TO BE REMOVED TEMPORARILY WHEN DEVICES ARE TO BE MOVED INTO COOLING CHANNEL 10

To Do To Investigate l l l Ensure magnetic field is low enough not to affect compressors in west wall position Can all cold heads / compressors accept an extra few metres of line temporarily, i. e. when devices pulled off-line on moving platforms (non operational – keep cold e. g. <50 ºK) Ensure assembly area is big enough and that stairs & services bridge are compatible with device assembly and installation To Design l l l Optimise routing & length of hoses and power cables from compressors to cryo-heads etc to minimise excess. Structure to manage 38 to 62 relatively large and stiff hoses + power services West mezzanine and stairs 11

To Do l Installation l Remove current stairs & PPS cage Install west mezzanine platform, stairs & new PPS ‘Transplant’ services from south mezzanine Reroute water feeds Install services management & compressor supports Fit compressors Run hoses & power to devices as required l l l 12

Finally Conclusion l l l 30 m hoses (no performance losses) can be run from west wall to devices with minimal compromise (reduced assembly area) Compressor layout (with mezzanine) allows easy & safe access to 2 x high compressors Structural work (mezzanine, stairs, PPS) significant but not expensive in comparison to 19 x compressor magnetic shielding cabinets Capacity in solution for Step V & VI compressors If magnetic fields turn out to be too high at any step on west wall and there are no other solutions then magnetic shielding may be implemented in this configuration 13