2 Davide Aguglia TE-EPC-FPC Sept. 23 rd rd PSB injection EPC powering rack space coordination meeting Stripping foil chicane BSW magnets powering BRF2 EPC infrastructure

Goals 3 Introduce functional specs / general powering layout Explain/justify needs for short cable length Give preliminary needs for all kind of interconnections with power converters Derive next actions and identify missing info 3rd PSB injection EPC powering rack space coordination meeting

functional specs / general powering layout 4 16 power converters required for feeding 16 magnets separately 2 types of converters (BSW1 different from BSW2, 3, & 4) 2 power converters spares – total of 18 converters 3rd PSB injection EPC powering rack space coordination meeting BSW1BSW2&3BSW4 L (µH) R (mΩ)3.577 I peak (A) I rms (A) V max (V)450 BSW magnet’s electrical specifications

functional specs / general powering layout 5 Overall current/voltage specification 3rd PSB injection EPC powering rack space coordination meeting t rise (ms)5 t flat (ms)1 to 2 t fall (ms)5 t rep (ms)900 Because infinite dv/dt not possible, current smoothing agreed with beam optics Absolute precision: 100 ppm (±50 ppm) during flat-top (starting from when beam is injected) 1000 ppm (±500 ppm) during ramp-down

functional specs / general powering layout 6 Power converter topology and features 3rd PSB injection EPC powering rack space coordination meeting Main features: Bi-directional energy exchanges between magnet and capacitor bank with minimum losses Possibility to slightly change/re-program the current reference Minimum power fluctuation and good power quality withdrawn from the mains Remote control and diagnostics via the new FGC3-based controller Possibility of re-using standard EPC converter components

Need for short cables length 7 Simplified analysis – referring all to primary 3rd PSB injection EPC powering rack space coordination meeting Supposing 800V as maximum voltage which can be delivered from power converter (standard technology limitation) Knowing that cable inductance L cs depends on its length Overall design parameters are k and cable length!

Need for short cables length 8 Example– limitations vs cable length 3rd PSB injection EPC powering rack space coordination meeting 4 conductors of 75mm 2 each, DC, L=0.26µH/m: Converters power, volume and cost increase with cable length (analysis considering resistive effects):

Need for short cables length 9 General powering layout 3rd PSB injection EPC powering rack space coordination meeting Possibility of deporting pulse transformers of BSW2, 3, & 4 nearer the magnet

Need for short cables length 10 Re-arrangement of power converters rack & connections 3rd PSB injection EPC powering rack space coordination meeting Each converter 3 racks access from front and rear of each rack! 54 racks total List of connections to power converter:

Interconnections with power converters 11 Re arrangement of power converters rack 3rd PSB injection EPC powering rack space coordination meeting Average power conv. Consumption: ~ 5-10 kW – outlet switchgears 32 A Losses: ~ 1 kW Cooling: Water or air If EPC standard components water Otherwise forced air For water cooling each converter needs ~12 l/min, 250 mbar pressure drop For BSW1 DCCTs cables are provided by EPC (15 mm diameter cables) Ethernet switch and gateway probably need a supplementary rack. Is there a magnet interlock? (water, vacuum, overcurrent) Beam Interlock System (BIS) connection? EIS? All this is preliminary! Need cable type and start final design!

next actions / missing info Obtain final DC cable for starting design (EN/EL) Re-evaluation of maximal cable length with final cable (Davide) Make sure that cable length does not affects DCCTs precision (Davide with EPC/HPM) Start final design (Davide) Identify cooling requirements Verify power converter volume, or rack number Fix converter current of BSW1 converters, derive cables 12 3rd PSB injection EPC powering rack space coordination meeting