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Niels Pyka, FAIR Synchrotrons
SIS300 Preconsortium Meeting @ Protvino, March 19th 2009
SIS300 lattice and main required SIS300 lattice and main required parameters of the magnetsparameters of the magnets
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Lasercooling
Extraction
RF Acceleration
Transf
er
Sixfold symmetry
SIS100 technical subsystems define the length and number of the straight sections of both synchrotrons
Good geometrical matching to the overall geometry
Supply Buildings
Supply buildings on top of each straight with six connections to the tunnel
OR
A parallel supply tunnel at the inner shell of the synchrotron
SIS300 OverviewSIS300 Overview
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
SIS300 OverviewSIS300 Overview
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
SIS300 Basic RequirementsSIS300 Basic Requirements
• The SIS300 will be installed on top of SIS100 in the same tunnel.
• The maximum magnetic rigidity is 300 Tm in high energy mode
• The magnetic rigidity is up to 100 Tm in stretcher mode
• Curved super conducting cos(θ)-type magnets will be used with a maximum field of 4.5 T in the dipoles.
• The injection into SIS300 is performed via a vertical transfer line from SIS100.
• The design injection energy is 1500 MeV (64 Tm). The expected beam emittance is 10x4 pi mm mrad. Lower injection rigidities are possible with reduced intensity down to 27 Tm in stretcher mode.
• The slow extraction is performed vertically into an extraction beamline parallel to the one of SIS100.
• In case of emergency the beam is dumped into an internal target
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Small ring circumference and matching to the SIS100 geometry requires a FODO lattice and
curved dipole magnets.
Advantages a) chromaticity correction with minor DA reduction only
b) slow extraction with reasonable s.c. septum strength
FODO Lattice based on long (and short) curved dipoles
0. path length [mm] 180600.
-65.
y[m
m].. x[m
m] 65.
D,F Quadrupoles Dipole= Dispersion
SIS300 LatticeSIS300 Lattice
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Lattice Characteristics The FODO structure with missing dipole arc has 14 half cells per sector and
fits to SIS100 within a few centimeters.
An additional short (missing) dipole is needed with extra power or bypass circuit. The short dipole is needed in the HEBT system too.
The necessary QP aperture is larger compared to a doublet structure but the necessary gradient is considerably lower.
Half of the number of quadrupoles is needed but the acceptance is lower
Only half of the number of sextupoles for chromaticity correction is needed. Chromaticity correction (required for Hardt condition) is easier and does not reduce the DA as much as in a doublet lattice.
The loss distribution of ionized particles is no longer peaked. The vacuum stability is assumed to be sufficient.
Lower fields in s.c. extraction septum required. Fast extraction feasible.
The available free space in each lattice cell becomes reasonable.
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
SIS300 Cell LayoutSIS300 Cell Layout
path length [mm]-
QP QP
BPMSextupoleH/V Steerer
-80
Y [m
m]
.. X
[m
m]
+80
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Lattice Structure FODO
Number of superperiods 6
Machine circumference [m] 1083.6
Magnetic rigidity B [Tm] 300
Number of lattice cells NF 6 x 14
Length of lattice cell LF [m] 12.9
Straight sections length [m] 4 x LF
Number of dipole magnets 48 long + 12 short
Dipole bending angle α [deg] 62/3° , 31/3°
Maximum dipole field B [T] 4.5
Bending radius R [m] 66.6666
Number of quadrupole magnets 84
Maximum field gradient [T/m] 45
SIS300 Lattice Parameters
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
SIS300 Slow Extraction
Working Point Q_h/Q_v 13.3 / 9.8 (preliminary)
Transverse acceptance h/v [mm mrad] 50.9 / 44.3
Natural chromaticity h/v [dQ/Q] -1.358 / -1.372
Phase advance per cell h/v [deg] 114 / 84
Gamma_t 9.35
Max. beta h/v [m] 47.2 / 47.4
Max. D h [m] 2.33
Min. D h [m] -4.58
SIS300 Working Point
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Transfer SectionTransfer Section
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Transfer SystemTransfer System
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Transfer Y-type CryostatTransfer Y-type Cryostat
ACCEL Report no
1701-BP-7711-1
June 2008
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Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
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Combination of horizontal excoriation and vertical extraction (ES+LS+MS) Chromaticity control: Hardt condition realized (separatrices coaligned) thus
minimum beam loss
+60 mm
60 m
-60 mm
SIS300 Slow Extraction
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
SIS 300
SIS 100
Ve
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Slow extraction
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
E-dump
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SIS 300 Emergency Beam Dump
This is an emergency beam dump only.It is not foreseen for machine development.
The dump is located at the same area of the tunnel as the dump of SIS 100.
Kickers Kickers
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Magnets: General RemarksMagnets: General Remarks
Cooling is with supercritical He:Mass flow rate: <200g/sPressure: <3.5 bar Pressure vessel !!
All Dipoles, focusing and defocusing quadrupoles are powered in series
3 pairs of bus bars
All corrector magnets are powered individuallyLow current option: I<250 A
Chromaticity Sextupoles: two families, powered in series of 4 magnets(to taylor the DA for slow extraction some will be powered individually)
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Basic Magnet ParametersBasic Magnet Parameters
Flat top up to 100s during extraction
DipolesHigh energy mode ramped from 1 T to 4.5 TStretcher mode static (but ramped to) 0.4 T to 1.5 TRamp rate 1 T/s
QuadrupolesHigh energy mode ramped from 10 T/m - 45 T/mStretcher mode static (but ramped to) 4 T/m - 15 T/mRamp rate 10 T/(ms)
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Main Dipole ParametersMain Dipole Parameters
short long
Maximum magnetic field [T] 4.5
Number of magnets in the ring + reference magnets 12 +1 48 + 1
Magnetic length [mm] 3878.5 7757.0
Bending angle / radius [deg] / [m] 3.333 / 66.67 6.667 / 66.67
Free aperture (beam pipe ID) [mm] 86
Coil inner diameter [mm] 100
Field quality at r=35mm [units] 2
Ramp rate [T/s] 1
Cos magnetsSupercritical He is recooled
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Main DipolesMain Dipoles
Block number 5
Turn number/quadrant 34 (17+9+4+2+2)
Operating current 8924 A
Yoke inner radius 98 mm
Peak field on conductor (with self field) 4.90 T
Bpeak / Bo 1.09
Working point on load line 69%
Current sharing temperature 5.69 K
Inductance/length 2.9 mH/m
Stored energy/length 116.8 kJ/m
Discorap-Project by INFNMagnet finished in 2010
(courtesy P. Fabbricatore)
(courtesy R. Marabotto)
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Main Dipoles / Low Loss ConductorMain Dipoles / Low Loss Conductor
Diameter after coating [mm] 0.825 ± 0.003
Filament twist pitch [mm] 5 +0.5 -0
Effective Filament Diameter [µm] 2.5 – 3.5
Interfilament matrix material Cu-0.5 wt% Mn
Filament twist direction right handed (clockwise)
Ic @ 5 T, 4.22 K [A] 541
n-index @ 5 T, 4.22 K 30
Stabilization matrix Pure Cu
ρt at 4.22 K [n∙m] 0.4 + 0.09 B [T]
Cu+CuMn:NbTi ratio (α) >1.5 ± 0.1
Surface coating material Stabrite (Sn-5 wt% Ag)
Strand Number 36
Width [mm] 15.10 +0 -0.020
Thickness, thin edge [mm] 1.362 ± 0.006
Thickness, thick edge [mm] 1.598 ± 0.006
Mid-thickness at 50 MPa [mm] 1.480 ± 0.006
Edge radius [mm] ≥ 0.30
Core material AISI 316 L stainless steel, annealed
Core width [mm] 13
Core thickness [µm] 25
Transposition pitch [mm] 100 ± 5
Cable transposition direction left-handed screw thread
Ic @ 5 T, 4.22 K [A] >18,540
Stabilization matrix RRR >70
Wire Cable
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Main Quadrupole ParametersMain Quadrupole Parameters
Magnetic field Gradient [T/m] 45
Number of magnets in the ring +reference magnets 84 + 2
Magnetic length [m] 1
Free aperture (beam pipe ID) [mm] >105
Coil inner diameter [mm] 125
Field quality at r=40 mm [units] 2
Ramp rate [T/(ms)] 10
Design principles:
Cos2-magnetOne layer coilNo recooling of supercritical HeLow loss Rutherford cable
TRANSFER
Quadrupole magnets
Equivalent pole tip field [T]
Max. field gradient
[T/m]
Effective field length
[m]
Yoke length [m]
Usable free aperture hxv
[mm]
Max. ramp rate
[T / (ms)]
4x Warm iron 0.72 18 1.0 0.92 80 x 80 38
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Main QuadrupolesMain Quadrupoles
Block number 3
Turn number/coil 20 (8+7+5)
Strands in cable 19
Strand diameter 0.825 mm
Operating current 6220 A
Yoke inner radius 95 mm
Peak field on conductor (with self field)
3.57 T
Minimum temperature margin 1.6 K
Inductance/length 2.46 mH/m
Stored energy/length 44.4 kJ/m
Ramp-up voltage 3.4 V
IHEP Design Study
(courtesy L. Tkachenko)
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Correction SystemCorrection System
Chromaticity correction sextupoles (6x2x2), arcs
Resonance sextupoles (6x2), straights
Steering magnets (6x12), each cell except 2 in the arcs
Correction multipoles (6x2), end of the arcs
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
The chromaticity sextupoles are powered in series with one adjacent arc.
All other correction elements have individual power supplies.
Steerer magnets are combined horizontal and vertical steerers.
1 2 3 4
= Main Quadrupoles = Cryostat
SIS 300 Straight
1 2 3 4 5 6 7 8 9 10
= Steerer = Chrom. sextupoles = Ext. sextupole= Err. corr. multipole
SIS 300 Arc Two chromaticity sextupole families
SIS300 Correction SystemSIS300 Correction System
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
CryomodulesCryomodules
Type B Type A
Chromaticity sextupole 105
Main quadrupole 105
Chromaticity sextupole 105
Main quadrupole 105Steerer 105
Long dipole 86
Type D Type CType E
Steerer 105Main quadrupole
105 Extraction
sextupole 86
Short dipole 86Error compensation multipole 105
Connection cryostat
Long dipole 86
Steerer 105Main quadrupole
105
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Chromaticity sextupoles
Number of magnets 24
Physical length 0.75 m
Effective length 0.78 m
Aperture 105 mm
Main field strength* 130 T/m2
Ramp time to Max. 0.208 sec.
Requirements
Chromaticity sextupoles
Current [A] 220
Stored energy [J] 1376
Inductance [mH] 56.7
Inductive voltage [V] 60
Peak power [W] 13200
Computation results
Resonance sextupoles
Number of magnets 12
Physical length 1.0 m
Effective length 0.975 m
Aperture 86 mm
Main field strength* 325 T/m2
Ramp time to Max. 0. 5 sec.
Resonance sextupoles
Current [A] 216
Stored energy [J] 3120
Inductance [mH] 133.7
Inductive voltage [V] 58
Peak power [W] 12500
BBy iBx (Bnn1
iAn )(x iy)n1*Super-ferric magnet (also cos option possible)
SIS300 Sextupole Magnets
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
SIS 300 Steerer MagnetSIS 300 Steerer Magnet Requirements
H/V dipole
Number of magnets
HEBT (Phase A / B)
72
1 / 5
Physical length 0.75 m
Effective length 0.65 m
Aperture 105 mm
Main field strength 0.5 T
Ramp time to Max. 2.27 sec.
Computation results
H/V dipole
Current [A] 228
Stored energy [J] 871
Inductance [mH] 33.4
Inductive voltage [V] 3.36
Peak power [W] 767
Saddle coils
Insulated Superconducting wires
Niels Pyka SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Multipole CorrectorMultipole Corrector
Sextupole Octupole
Quadrupole
12
Number of magnets
Physical length 0.75 m
Magnetic length 0.65 m
Aperture 105 mm
B2 = 1.8T/m B4 = 767T/m3
Max. field strength*
Ramp time to max. 2.25 sec. 2.18 sec. 2.24 sec.
Nested magnet
Saddle coils with insulated superconducting wires
Requirements
Quad. Sext. Oct.
Current [A] 228 219 211
Stored energy [J] 26 72 42
Inductance [mH] 1 3 2
Inductive Voltage [V] 0.1 0.3 0.2
Peak power [W] 23 66 38
Computation results
BBy iBx (Bnn1
iAn )(x iy)n1*