Separator and hemistry pparatus - GSI · Comparison of separators old NASE (HECK) sep. working RITU...
Transcript of Separator and hemistry pparatus - GSI · Comparison of separators old NASE (HECK) sep. working RITU...
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TASCA separator - Trans Actinide Separator and Chemistry Apparatus
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2.00
4.7
2.5
70
45
QvDhD
BGS
1.000.780.610.630.67Dispersion, cm/%
4.74.83.84.34.0Length, m
2.21.852.23.12.2Bro, max, Tm
2545302323Bend. angle, deg
102210107Solid angle, msr
QvDQhQvDQhQvDQhQvDQhQvDvQhQvConfiguration
RITUGARISHECKDGFRSSASSY IISeparator
Comparison of separators
old NASE (HECK) sep. working RITU separator
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Problems to have high transmision
connected to the initial beam:• Size of the beam
• Energy and Angular spread of the beam
• Energy and Angular spread of the beam in the target
connected to the products of reactions:• Energy and angular spread of products in the target
• Energy and angular straggling of products in the target
• Energy and angular straggling of products in the gas
• Charge value and spread of charge states in the gas
connected to separator:• Ion – optical scheme
• Vertical and horizontal acceptance of Dipole magnet
• Vertical and horizontal acceptance of Quadrupole magnets
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Input parameters
for TRANSPORT and GICO calculations
The studied test reaction is:• 48Ca(235 MeV) + 238U(0.5 mg/cm2) -> 286112 -> 283112 + 3n
• 54% of 283112 will appear within ±40 mrad
(according to simulations of K.E.Gregorich)
Input parameters:• Horizontal and vertical beam size - ± 2.5 mm
• Horizontal and vertical angle of the products - ± 40 mrad
• Momentum dispersion - ± 5% (92% of all 283112)
• Magnetic rigidity – 2.24 T*m
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Summary data at the exit focus
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Final decision: DQQ - configuration
Where are the problems and how to solve them:Magnet vacuum chamber – increase vertical and horizontal aperture solution – calculate
the magnet to skip shims (+10% in vertical aperture), new large vacuum chamber in vert. and horiz. sizes + RITU experience - large size chamber
Quads vacuum chamber - increase vertical and horizontal aperture. It was two options cheap square chamber and expensive butterfly-like vacuum chamber.
New more powerful power supply for Bending magnet.
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TASCA magnet
KOMPOT 3D mesh(number of calculated points
128*63*59 = 475776)
KOMPOT computation model
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YokePole piece
Distribution of B (in kGauss).Existing pole. I=700 A. Bmax=1.635T=16.35kGauss
The KOMPOT magnetic field distributionVertical Section Horizontal Section
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TASCA magnet (shims variations). Distribution of Induction in the central vertical section.
Existing pole without shims.
I = 700 A. Bmax = 1.643 T =
= 16.43 kGauss
Existing pole with anti-shims.
I = 700 A. Bmax = 1.666 T =
= 16.66 kGauss
Existing pole with shims.
I =700 A. Bmax = 1.635 T =
=16.35 kGauss
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TASCATASCATASCATASCAGSI Darmstadt TU München@
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Magnetic field distributions in the central crossection of TASCA magnet
-0.10-0.08-0.06-0.04-0.02 0.00 0.02 0.04 0.06 0.08 0.101.20
1.25
1.30
1.35
1.40
1.45
1.50
1.55
1.60
1.65
1.70
1.75
1.80
B(T
)
dX(m)
"500A"
"600A"
"700A"
"750A"
"800A"
"850A"
2.491.78850
2.421.73800
2.351.68750
2.281.63700
2.101.50600
1.851.32500
Bρ
(T m)
B
(T)
Current
(A)
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Dipole Magnet
vacuum chamber design
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Quadrupole vacuum
chamber design
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DQhQv - configuration with new input parameters
���� Horiz. ang. accept. ����
���� Vert. ang. accept. ����
���� Aver. ang. accept. ����
���� Solid angle ����
���� Ang. transmis. ����
���� Total transmis. ����
���� Horiz. image size ����
���� Vert. image size ����
���� Image area ����
Present set-up:
x'= 60mrad
y'= 33mrad
x'y'=45mrad
SA= 6.4 msr
T' = 58%
T = 52%
X = 12 cm
Y = 2.2 cm
S = 21 cm2
Future TASCA:
x'= 110mrad
y'= 40mrad
x'y'=65mrad
SA= 13.3msr
T' = 72%
T = 65%
X = 14 cm
Y = 2.5 cm
S = 27 cm2
VARIABLE INPUT PARAMETERS:
RESULTS OF CALCULATIONS:
RESULT:
New vacuum chambers (in dipole magnet and butterfly-like one in quads)
� increase transmission by (minimum) 25%
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���� Horiz. ang. accept. ����
���� Vert. ang. accept. ����
���� Aver. ang. accept. ����
���� Solid angle ����
���� Ang. transmis. ����
���� Total transmis. ����
���� Horiz. image size ����
���� Vert. image size ����
���� Image area ����
Present set-up:
x'= 21mrad
y'= 33mrad
x'y'=26mrad
SA= 2.6 msr
T' = 33%
T = 30%
X = 2.5 cm
Y = 2.5 cm
S = 5 cm2
Future TASCA:
x'= 34mrad
y'= 40mrad
x'y'=37mrad
SA= 4.3 msr
T' = 44%
T = 40%
X = 3 cm
Y = 3 cm
S = 7 cm2
DQvQh - configuration with new input parameters
VARIABLE INPUT PARAMETERS:
RESULTS OF CALCULATIONS:
RESULT:
New vacuum chambers (in dipole magnet and butterfly-like one in quads)
� increase transmission by (minimum) 25%
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RESULT:We are not sensitive to a large spot sizeof the primary heavy-ion beam
Beam spot size dependence of the 112 transmission
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56.1
56.2
56.3
56.4
56.5
56.6
56.7
56.8
Tra
nsm
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12
(%
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Beam size (mm)
- horizontal variation, vertical fixed 4 mm
- vertical variation, horizontal fixed 4 mm
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CONCLUSIONS:
• DQQ–configuration is the optimized configuration for TASCA – most efficient and most universal
• We increased the size of the vacuum chamber in the dipole magnet
• We increased the size of the vacuum chamber in the quadrupoles – butterfly-type with large acceptance
• This increased the transmission of 112 by at least 25%
• The TASCA dipole magnet with new power supply can operate
up to magnetic rigidities of 2.5 Tm
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What are we have now:• Dipole magnet and quadrupoles were tested
• Vacuum chambers for all magnets will come this month
• Two detector chambers are in the cave • All power supplies for Dipole magnet, Q1 and Q2
• Vacuum pumps and equipment• Computers and parts of control system
Our future plans:• Monte-Carlo simulations of transmission with higher accuracy
are still actual• Current year – continue to constructing TASCA separator based
on existing components and new vacuum chambers
• Vacuum system constructing• Writing Control system
• Following two years - testing TASCA separator
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DQhQv-
configuration
DQvQh-
configuration
Recoils beam shape in TASCA
vacuum chambers
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Energy distribution of products from a target
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The studied reaction is:48Ca(235 MeV)+238U(0.5 mg/cm2) -> 286112 -> 283112 + 3ndifferent target materials
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0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.20
0.22
0.24
0.26
Pro
bab
ility
/1 M
eV
Energy (MeV)
B - K.E.Gregorich
D - LISE U
E - LISE UF4
G - Popeko UF4
H - LISE UO2
1231A.Popeko
536UF4 K.E.G.
635.5UO2(LISE)
635UF4(LISE)
436.5U (LISE)
FWHM
(MeV)
TKE112
(MeV)
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6025UF4 K.E.G.
4022U (LISE)
7028A.Popeko
4024UF4(LISE)
4023UO2(LISE)
FWHM
(mrad)
Peak
Angle
(mrad)
Angular straggling of products in the target
The studied test reaction is:48Ca(235 MeV)+238U(0.5 mg/cm2) -> 286112 -> 283112 + 3n
beam energy at the target center
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0.01
0.02
0.03
0.04
0.05
0.06
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Pro
ba
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ty/a
ngle
Angle, mrad
Un - metallic U (LISE)
UO2n - UO2 (LISE)
UF4n - UF4 (LISE)
UF4Kenn - UF4 (K.Gregorich)
UF4Pn - UF4 (Popeko)