1. IF Separator Design of RAON
Chong Cheoul, Yun
IF-RF Team

2. Contents Design requirements
Optics calculation by GICOSY code include fringing field from our magnet design
- Pre separator
- Main separator
- HEBT
Simulation for separation and PID
- MOCDI calculation for pre separator
- LISE++ calculation for main separator
Summary and future plan

3. Design requirements Requirements : 2 stage separator
→ Pre separator : Separation of Primary beam and unwanted RI beam
→ Main separator : Particle Identification
For 400 kW of High power beam
→ Beam dump at outside of Dipole magnet
Long drift space for Beam dump and Radiation shielding wall
→ decrease momentum and angular acceptance
Large acceptance for U-fission : ( > 100 mrad, > 7 %)
→ Warm bore radius 170 mm on the front half of Pre-separator
Higher order correction at dispersive focal points for Wedge degrader
High intensity RI beam, High transmission rate and High purity
Magnet design presented by Dr. D. G. Kim
Radiation activity around IF target presented by Dr. M. Kim

4. Layout of IF separator Pre-separator Main-separator Large chamber
radiation shielding wall
Large chamber
- Target System
- HTC Dipole and Q-magnet
- High Power Beam dump
At least
two radiation shielding wall for high radiation

5. IF separator system
HEBT : Primary beam delivery system ( 80 deg. 2nd order achromatic )
→ U beam with multi charge state
Pre-separator : Primary beam and unwanted RI beam separation
→ F1 : beam dump system
→ F3 : Wedge degrader
Main-separator : PID for cocktail RI beams
→ ΔE – Bρ – TOF method → Z, A/Q

6. Configuration of HEBT 80 deg. 2nd achromatic beam line
4 dipole magnet with 20 degree and 6.5 m radius
8 Quadrupole magnets and 16 Hexapole magnets
Large aperture for delivering multi charge state
→ 77+ ~ 82+ (Δp = ±2.5 %)
→ 90 mm of pole tip radius (2 FL1)
Q-triplet for tuning beam size on IF target
~ 27 m of total length from FL0 to F0
1 cell

7. Simulation result for HEBT
Particle distribution at the end of SCL2 by J. G. Hwang
Simulation result of TRACK
Multi charge state
U beam with 77+ ~ 82+
Less than 2 mm Beam size on IF target
FL FL FL F0
DYNAC program

8. Configuration of Pre-separator
Two dispersive and two achromatic focal points.
→ Beam F1 and Wedge F3
→ F2 & F4 doubly achromatic focal points
4 dipole magnet with 30 deg. Maximum Bρ 10 T∙m
7 + 2 Quadrupole triplet magnet ( 550 mm – 900 mm – 550 mm )
→ 170 mm of warm bore radius : PSQT1 ~ PSQT3
→ 120 mm of warm bore radius : PSQT4 ~ PSQT7, MAQT1, MAQT2
2 External Hexapole magnet and 4 multi pole coil
→ External Hexapole : PSHEX1, PSHEX2
→ Hexapole and multi coil : red color
Last 2 Q-triplet magnet for matching
Wedge Degrader
Beam dump

9. Optics calculation for Pre separator
1st order calculation by GICOSY
Angular acceptance
100 mrad in horizontal
80 mrad in vertical
Momentum acceptance
~ 8 %
Resolving power F1 F3
(with assumption of 1 mm beam size)
@ F1 with external hexapole magnet
@ F3 with multi pole coil
2nd order correction is successful

10. MOCADI Simulation @ Beam dump
238U (200 MeV/u) + C (1.9 mm)
Projectile fragmentation
238U
132Sn
87+ ~ 92 +
Beam dump
U fission
Beam dump
MOCADI result of separation at F1 beam dump
in the case of 132Sn for U – fission and
in the case of 100Sn for projectile fragmentation Remove by the beam dump
Beam dump
Design of Beam dump is underway.

11. Configuration of Main Separator
Two dispersive and two achromatic focal points
→ 2nd wedge F6
4 dipole magnet with 30 degree and 6 m of radius
8 Q-triplet magnets and 8 multi pole coils
→ winding multi coil on cold tube
→ 120 mm of warm bore radius
Two operation mode
→ Large acceptance mode
→ High resolution mode
2nd Wedge degrader

12. Main separator – Large acceptance mode
Angular acceptance
90 mrad in horizontal
70 mrad in vertical
Momentum acceptance
~ 8 %
Resolving power F6 F8
(with assumption of 1mm beam size)
2nd order correction is successful
with use of multi pole coils

13. Main separator – high resolution mode
Angular acceptance
50 mrad in horizontal
50 mrad in vertical
Momentum acceptance
~ 6 %
Resolving power F6 F7 F8
(with assumption of 1mm beam size )

14. LISE++ simulation for PID
5th dipole magnet F9
TOF : F5 – F9
ΔE : gas ion F9
Bρ selection : 5th Dipole magnet
→ A/Q, Z
Make a input file for LISE++
including Transfer matrix from GICSY calculation, slit system,
and detector system PPAC, plastic, gas ion chamber.

15. LISE++ simulation for Projectile fragmentation
100Sn
112Sn 242 MeV/u + C (2.55 mm)
Transmission rate ~ 54 %
Production yield ~ 10 pps Z
Wedge Degrader d/R = 0.3 (1.5 mm) @ F3
Wedge Degrader d/R = 0.2 (0.65 F6
A/Q

16. LISE++ simulation for U fission
238U 200 MeV/u + C (1.9 mm)
Transmission rate ~ 12 %
Production yield ~ 105 pps
132Sn Z
Wedge Degrader d/R = 0.3 (1.58 F3
Wedge Degrader d/R = 0.2 (0.86 F6
A/Q

17. Summary and Future plan
Design IF separator for High beam power
Large Momentum and angular acceptance with use of large aperture
on the front half of Pre-separator
→ 100 mrad and 8 %
Good separation of Primary beam and RI beam at Beam dump
→ D = 2.03 cm/%
Two mode operation for Main separator
→ Large acceptance mode
→ High resolution mode
Good PID in the case of 100Sn and 132Sn
Future plan
MOCADI and LISE++ simulation in the case of variable RI beam production
→ Separation of Primary beam and RI beam at beam dump
→ PID at main separator
Design for Beam dump
Development for High counting rate detector
etc…..

18. 112Sn (242 MeV/u) + C (2.55 mm) PID for 100Sn Wedge degrader @ F3
Bρ selection
Proton Number
Bρ selection + Z2 selection by 1st degrader
Wedge F3
Without Wedge degrader
Neutron Number
112Sn (242 MeV/u) + C (2.55 mm)
PID for 100Sn
Proton Number
Bρ selection + Z2 selection by 1st degrader +
Z2 2nd selection by
Wedge F3
Wedge F6
Neutron Number

19. 238U(200 MeV/u) + C (1.99 mm) PID for 132Sn Wedge degrader @ F3
Bρ selection
Proton Number
Bρ selection + Z2 selection by 1st degrader
Wedge F3
Without Wedge degrader
Neutron Number
238U(200 MeV/u) + C (1.99 mm)
PID for 132Sn
Proton Number
Bρ selection + Z2 selection by 1st degrader +
Z2 2nd selection by
Wedge F3
Wedge F6
Neutron Number