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