Separator and hemistry pparatus - GSI · Comparison of separators old NASE (HECK) sep. working RITU separator. 3 GSIDarmstadt TU ... Magnet vacuum chamber – increase vertical and

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GSI Darmstadt TU München@

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TASCATASCATASCATASCA

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

4 6 8 10 12

56.1

56.2

56.3

56.4

56.5

56.6

56.7

56.8

Tra

nsm

issio

n o

f 1

12

(%

)

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

20 22 24 26 28 30 32 34 36 38 40 42 44

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

0 10 20 30 40 50 60 70 80 90 1001101201301401500.00

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0.08

0.09

0.10

Pro

ba

bili

ty/a

ngle

Angle, mrad

Un - metallic U (LISE)

UO2n - UO2 (LISE)

UF4n - UF4 (LISE)

UF4Kenn - UF4 (K.Gregorich)

UF4Pn - UF4 (Popeko)

Documents

Separator and hemistry pparatus - GSI · Comparison of separators old NASE (HECK) sep. working RITU separator. 3 GSIDarmstadt TU ... Magnet vacuum chamber – increase vertical and