Transcript SIS 300 Status

SIS300 lattice and main required
parameters of the magnets
Niels Pyka, FAIR Synchrotrons
SIS300 Preconsortium Meeting @ Protvino, March 19th 2009
SIS300 Overview
Sixfold symmetry
Lasercooling
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
Niels Pyka
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
SIS300 Overview
Niels Pyka
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
SIS300 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
SIS300 Lattice
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
-65.
y[mm].. x[mm]
65.
FODO Lattice based on long (and short) curved dipoles
0.
path length [mm]
= Dispersion
Niels Pyka
D,F Quadrupoles
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
180600.
Dipole
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
+80
SIS300 Cell Layout
QP
-80
Y [mm] .. X [mm]
QP
path length [mm]
H/V Steerer
Niels Pyka
Sextupole
BPM
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
SIS300 Lattice Parameters
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
Maximum field gradient
Niels Pyka
84
[T/m]
45
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
SIS300 Working Point
SIS300
Working Point
Slow Extraction
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
Max. beta
9.35
h/v
[m]
47.2 / 47.4
Max. D
h
[m]
2.33
Min. D
h
[m]
-4.58
Niels Pyka
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Transfer Section
Niels Pyka
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Transfer System
Niels Pyka
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Transfer Y-type Cryostat
16
15
14
13
12
11
10
9
8
7
6
5
4
3
1
2
M
M
A (1:2)
70
B ( 1: 2 )
Cold Mass (1 : 5 )
280
L
L
270
90
K
K
190
I
I
320
H
H
170
100
190
40
240
G
G
40
A
F
F
( 1 : 10 )
340
170
230
E
E
330
B
220
300
DD
D
30
C
C
Instalation Balls
200
250
ACCEL Report no
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June 2008
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SIS300 Preconsortium Meeting, Protvino, 19th March 2009
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Niels Pyka
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SIS300 Slow Extraction
Horizontal plane
+60 mm
-60 mm
60 m
 Combination of horizontal excoriation and vertical extraction (ES+LS+MS)
 Chromaticity control: Hardt condition realized (separatrices coaligned) thus
minimum beam loss
Niels Pyka
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Vertical plane
SIS 300
Slow extraction
SIS 100
Niels Pyka
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Vertical plane
SIS 300 Emergency Beam Dump
Kickers
Kickers
E-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.
Niels Pyka
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Magnets: General Remarks
Cooling is with supercritical He:
Mass flow rate: <200g/s
Pressure: <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 individually
Low 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 Parameters
Flat top up to 100s during extraction
Dipoles
High energy mode ramped from 1 T to 4.5 T
Stretcher mode static (but ramped to) 0.4 T to 1.5 T
Ramp rate 1 T/s
Quadrupoles
High energy mode ramped from 10 T/m - 45 T/m
Stretcher mode static (but ramped to) 4 T/m - 15 T/m
Ramp rate 10 T/(ms)
Niels Pyka
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Main Dipole Parameters
Cos  magnets
Supercritical He is recooled
short
Maximum magnetic field [T]
long
4.5
Number of magnets in the ring + reference magnets
12 +1
48 + 1
Magnetic length [mm]
3878.5
7757.0
3.333 / 66.67
6.667 / 66.67
Bending angle / radius [deg] / [m]
Free aperture (beam pipe ID) [mm]
86
Coil inner diameter [mm]
100
Field quality at r=35mm [units]
2
Ramp rate [T/s]
1
Niels Pyka
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Main 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
(courtesy R. Marabotto)
Discorap-Project by INFN
Magnet finished in 2010
(courtesy P. Fabbricatore)
Niels Pyka
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Main Dipoles / Low Loss Conductor
Wire
Cable
Diameter after coating [mm]
0.825 ± 0.003
Strand Number
36
Filament twist pitch [mm]
5 +0.5 -0
Width [mm]
15.10 +0 -0.020
Effective Filament Diameter [µm]
2.5 – 3.5
Thickness, thin edge [mm]
1.362 ± 0.006
Interfilament matrix material
Cu-0.5 wt% Mn
Thickness, thick edge [mm]
1.598 ± 0.006
Filament twist direction
right handed (clockwise)
Mid-thickness at 50 MPa [mm]
1.480 ± 0.006
Edge radius [mm]
≥ 0.30
Core material
AISI 316 L stainless steel,
annealed
Ic @ 5 T, 4.22 K [A]
541
n-index @ 5 T, 4.22 K
30
Stabilization matrix
Pure Cu
Core width [mm]
13
ρt at 4.22 K [n∙m]
0.4 + 0.09 B [T]
Core thickness [µm]
25
>1.5 ± 0.1
Transposition pitch [mm]
100 ± 5
Stabrite (Sn-5 wt% Ag)
Cable transposition direction
left-handed screw thread
Ic @ 5 T, 4.22 K [A]
>18,540
Stabilization matrix RRR
>70
Cu+CuMn:NbTi ratio
(α)
Surface coating material
Niels Pyka
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Main Quadrupole Parameters
Magnetic field Gradient [T/m]
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
TRANSFER
Quadrupole
magnets
4x
Niels Pyka
Warm iron
Design principles:
45
Cos2-magnet
One layer coil
No recooling of supercritical He
Low loss Rutherford cable
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)]
0.72
18
1.0
0.92
80 x 80
38
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Main Quadrupoles
IHEP Design Study
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
Niels Pyka
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
(courtesy L. Tkachenko)
Correction 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
SIS300 Correction System
SIS 300 Arc
1
2
Two chromaticity sextupole families
= Steerer
7
6
5
4
3
= Chrom. sextupoles
= Err. corr. multipole
SIS 300 Straight
1
= Main Quadrupoles
Niels Pyka
2
= Cryostat
3
4
9
8
10
= Ext. sextupole
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.
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Cryomodules
Type E
Steerer 105
Main quadrupole 105
Extraction sextupole
86
Type D
Connection cryostat
Short dipole 86
Error compensation multipole
105
Steerer 105
Main quadrupole
105
Long dipole 86
Type A
Type B
Chromaticity sextupole
105
Main quadrupole 105
Niels Pyka
Type C
Long dipole
86
Chromaticity sextupole 105
Main quadrupole 105
Steerer 105
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
SIS300 Sextupole Magnets
Requirements
Chromaticity sextupoles
Number of magnets
Resonance sextupoles
24
Number of magnets
12
Physical length
0.75 m
Physical length
1.0 m
Effective length
0.78 m
Effective length
0.975 m
Aperture
105 mm
Aperture
86 mm
Main field strength*
130 T/m2
Main field strength*
325 T/m2
Ramp time to Max.
0.208 sec.
Ramp time to Max.
0. 5 sec.
Computation results
Resonance sextupoles
Chromaticity sextupoles
Current [A]
220
Current [A]
216
Stored energy [J]
1376
Stored energy [J]
3120
Inductance [mH]
56.7
Inductance [mH]
133.7
Inductive voltage [V]
Peak power [W]
Super-ferric magnet (also cos  option possible)
Niels Pyka
60
13200
Inductive voltage [V]
58
Peak power [W]
12500

*B  By  iBx  (Bn  iAn )(x  iy)n1
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
n1
SIS 300 Steerer Magnet
Saddle coils
Insulated Superconducting wires
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
Niels Pyka
Current [A]
228
Stored energy [J]
871
Inductance [mH]
33.4
Inductive voltage [V]
3.36
Peak power [W]
767
SIS300 Preconsortium Meeting, Protvino, 19th March 2009
Multipole Corrector
Nested magnet
Saddle coils with insulated superconducting wires
Requirements
Quadrupole
Sextupole
Octupole
12
Number of magnets
Physical length
0.75 m
Magnetic length
0.65 m
Aperture
105 mm
Max. field strength*
B2 = 1.8T/m
B3 = 60T/m2
B4 = 767T/m3
Ramp time to max.
2.25 sec.
2.18 sec.
2.24 sec.
Computation results

* B  By  iBx  (Bn  iAn )(x  iy)
n1
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
n1
Niels Pyka
SIS300 Preconsortium Meeting, Protvino, 19th March 2009