MSI-V J. Borburgh, B. Balhan, E. Carlier, J.M. Cravero, B. Goddard, D. Nisbet, P. Van Trappen, F. Velotti

outline 1.Septum requirements 2.Retained septum concept 3.Mechanical concept and integration 4.Magnet control electronics 5.Power supply 6.Planning and resource requirements

Injection trajectory MSI-V blade Courtesy: F. Velotti TIDVG MSI

Septum requirements Beamp [GeV/c]B.Rho [T.m]Angle [mrad]B.dl [T.m] LHC/FT ions LHC p CNGS p Values indicated assume:  3.0 m magnetic length  60 mm full vertical gap  5 mm septum width Flat-top: tentatively over at least 100 µs (depending on timing accuracy?) Requested margin on magnet strength: being able to deflect protons 13 mrad at 26 GeV

outline 1.Septum requirements 2.Retained septum concept 3.Mechanical concept and integration 4.Magnet control electronics 5.Power supply 6.Planning and resource requirements

Basic magnet characteristics Under vacuum pulsed magnet Assuming half sine with third harmonic: 100 μs at precision → pulse width >~800 μs Layout proposed: 2 magnet blocks under vacuum 5 mm thick copper/stainless steel septum blade 1 single vacuum vessel

Magnet parameters Magnetic length mm Physical length mm Gap height60.4mm Horizontal aperture102mm Magnetic field0.541T ∫B.dl T.m Deflection angle mrad I peak 28.2kA Pulse width~3ms Septum thickness (copper + s.steel)mm Vacuum tank length~ 2500mm Expected lifetime # pulses

Radial septum position 1/2 FT beam at entrance of septum Ion beam at exit of septum Septum blade position at grazing incidence with orbiting FT beam

L physical = 3000 mm, downstream in the ‘shade’ of MSI (~ 40 mm septum thickness). Radial position blade incidence with orbiting FT beam : – 48 mm upstream, 43 mm downstream mrad) Radial position blade incidence with orbiting ion beam (since closer to orbiting beam than FT): – 72 mm upstream, 51 mm downstream mrad) Proposed positioning range (septum downstream): Radial: 42 – 52 mm Angular: 0 – 8 mrad No retracting foreseen Radial septum position 2/2

outline 1.Septum requirements 2.Retained septum concept 3.Mechanical concept and integration 4.Magnet control electronics 5.Power supply 6.Planning and resource requirements

Mechanical Concept 2 magnets, 1 common vacuum vessel 1 feedthrough per magnet Outside vacuum remote displacement system Impedance screen 2 VPI’s (tbc.) 2 transformers close to tank.

Design and integration Bruno Mechanical design Overall footprint Integration into SPS Impedance? Downstream Cross-Section Upstream Cross-Section Top Cross-Section

Possible integration

Cooling Magnet needs water cooling: ΔP = 12 bar P in max. = 15 bar Flow: Q ≈ 10 l/min. Auxiliary pump may be required in tunnel to keep pressure within range magnet operating range.

outline 1.Septum requirements 2.Retained septum concept 3.Mechanical concept and integration 4.Magnet control electronics 5.Power supply 6.Planning and resource requirements

Controls needs Dead beat control system by switching on/off 48V AC motors Local control with Touch Panel, remote control through FESA Siemens S7-300 F-CPU system with SIMOCODE modules for motor management Fail-safe modules for human and machine protection Position measurement by potentiometers, precision 100 µm Voltage measurement by analogue input cards; this limits cable length to 200 m when shielded

outline 1.Septum requirements 2.Retained septum concept 3.Mechanical concept and integration 4.Magnet control electronics 5.Power supply 6.Planning and resource requirements

Powering Proposal is to use MegaDiscaP type converter that is a high power / fast pulsed current source. MegaDiscaP converters are used in AD since 2012 and will be used for BI.SMV (PSB injection) One power supply per coil is required to cope with total load resistance. Matching transformers with n=16 to be installed in the tunnel (1m 3 per transformer) close to the magnet. (estimated stripline length = 2m)

Maximum operating current30kA Flat-top duration (with current stabilization)500µs Current precision< 1000 p.p.m. Primary voltage2kV Transformer ratio16 Septum resistance (total)0.200mΩ converter output0.150Ω converter output820uH Estimated cable length250m Estimated stripline length2m Converter Parameters

Septum magnet current Septum Magnet Current MegaDiscaP Converter Still to be studied in detail: o DCCT current measurement installation o Matching transformer design

Outstanding  Leak field validation  Vacuum equipment requirements  Cooling system in the tunnel  Detailed integration study  Impact of radiation on system Integrated leak field

outline 1.Septum requirements 2.Retained septum concept 3.Mechanical concept and integration 4.Magnet control electronics 5.Power supply 6.Planning and resource requirements

Proposed strategy and planning For LIU-PSB BT.SMV magnets will be removed from the vacuum tanks for newly constructed septa. As from 2018, at least 3 magnets will be available, with 6 more after LS2. These magnets could be re-used to construct 1 MSI-V for installation in LS2 and spares to be build after LS2. 1 magnet installed + 1 operational spare

Resource requirements Material budgetkCHF Mechanical design, drawing office60 Vacuum equipment, incl. bake out system, ion pump, gauges 2 x 80 Vacuum vessel2 x 100 Mechanical support30 Remote displacement system mechanics2 x 50 Electrical connection, incl. feedthrough, stripline, under vacuum connection 2 x 50 Hydraulics, under vacuum, connections in tunnel 50 Remote displacement electronics plus bake- out electronics, incl. cabling and FSU support 120 Power supply, including cabling to tunnel and transformer 500 TOTAL1320 ManpowerMY Septum hardware0.8 Septum electronics0.5 Power supply1.0