MSI-V J. Borburgh, B. Balhan, E. Carlier, J.M. Cravero, B. Goddard, D. Nisbet, P. Van Trappen, F....
Transcript of MSI-V J. Borburgh, B. Balhan, E. Carlier, J.M. Cravero, B. Goddard, D. Nisbet, P. Van Trappen, F....
MSI-V
J. Borburgh, B. Balhan, E. Carlier, J.M. Cravero, B. Goddard, D. Nisbet, P. Van Trappen, F. Velotti
outline
1. Septum requirements2. Retained septum concept3. Mechanical concept and integration4. Magnet control electronics5. Power supply6. Planning and resource requirements
Injection trajectory
MSI-V blade
Courtesy: F. Velotti
TIDVG
MSI
Septum requirementsBeam p [GeV/c] B.Rho [T.m] Angle [mrad] B.dl [T.m]
LHC/FT ions 17.1 60.0 13.0 0.78
LHC p+ 26.0 89.7 10 0.90
CNGS p+ 14.0 49.7 8.0 0.40
Values indicated assume: 3.0 m magnetic length 60 mm full vertical gap 5 mm septum width
• Flat-top: tentatively 1-2. 10-3 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 requirements2. Retained septum concept3. Mechanical concept and integration4. Magnet control electronics5. Power supply6. Planning and resource requirements
Basic magnet characteristics
• Under vacuum pulsed magnet• Assuming half sine with third harmonic:
100 μs at 10-3 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 parametersMagnetic length 996 + 996 mm
Physical length 1060 + 1060 mm
Gap height 60.4 mm
Horizontal aperture 102 mm
Magnetic field 0.541 T
∫B.dl 0.583 + 0.583 T.m
Deflection angle 6.5 + 6.5 mrad
Ipeak 28.2 kA
Pulse width ~3 ms
Septum thickness 4.5 + 0.5 (copper + s.steel) mm
Vacuum tank length ~ 2500 mm
Expected lifetime 60.106 # 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
• Lphysical = 3000 mm, downstream in the ‘shade’ of MSI (~ 40 mm septum thickness).
• Radial position blade when @grazing incidence with orbiting FT beam : – 48 mm upstream, 43 mm downstream (i.e. @1.66 mrad)
• Radial position blade when @grazing incidence with orbiting ion beam (since closer to orbiting beam than FT): – 72 mm upstream, 51 mm downstream (i.e. @7.33 mrad)
• Proposed positioning range (septum downstream):Radial: 42 – 52 mmAngular: 0 – 8 mrad
• No retracting foreseen
Radial septum position 2/2
outline
1. Septum requirements2. Retained septum concept3. Mechanical concept and integration4. Magnet control electronics5. Power supply6. 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 integrationDownstream Cross-Section Upstream Cross-Section
Top Cross-Section
Possible integration
Cooling
• Magnet needs water cooling:• ΔP = 12 bar• Pin 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 requirements2. Retained septum concept3. Mechanical concept and integration4. Magnet control electronics5. Power supply6. 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 requirements2. Retained septum concept3. Mechanical concept and integration4. Magnet control electronics5. Power supply6. 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 (1m3 per transformer) close to the magnet. (estimated stripline length = 2m)
Maximum operating current 30kA
Flat-top duration (with current stabilization) 500µs
Current precision < 1000 p.p.m.
Primary voltage 2kV
Transformer ratio 16
Septum resistance (total) 0.200mΩ
Resistance @ converter output 0.150Ω
Inductance @ converter output 820uH
Estimated cable length 250m
Estimated stripline length 2m
Converter Parameters
Septum magnet current
Septum Magnet CurrentMegaDiscaP Converter
Still to be studied in detail:oDCCT current measurement installation oMatching transformer design
Outstanding
Leak field validationVacuum equipment requirementsCooling system in the tunnel Detailed integration study Impact of radiation on system
0 10 20 30 40 50 60 700.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
tank 2
tank 1
tank 4
tank 3
distance from septum (mm)
1/1
00
0 o
f g
ap
fie
ld
Integrated leak field
outline
1. Septum requirements2. Retained septum concept3. Mechanical concept and integration4. Magnet control electronics5. Power supply6. 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 requirementsMaterial budget kCHF
Mechanical design, drawing office 60Vacuum equipment, incl. bake out system, ion pump, gauges
2 x 80
Vacuum vessel 2 x 100Mechanical support 30Remote displacement system mechanics 2 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
TOTAL 1320
Manpower MYSeptum hardware 0.8
Septum electronics 0.5
Power supply 1.0