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

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

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

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

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

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 cm/% @ FL1) Q-triplet for tuning beam size on IF target ~ 27 m of total length from FL0 to F0 1 cell

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 FL0 FL1 FL2 F0 DYNAC program

Configuration of Pre-separator Two dispersive and two achromatic focal points. → Beam dump @ F1 and Wedge degrader @ 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

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 2300 @ F1 3050 @ F3 (with assumption of 1 mm beam size) @ F1 with external hexapole magnet @ F3 with multi pole coil 2nd order correction is successful

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.

Configuration of Main Separator Two dispersive and two achromatic focal points → 2nd wedge degrader @ 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

Main separator – Large acceptance mode Angular acceptance 90 mrad in horizontal 70 mrad in vertical Momentum acceptance ~ 8 % Resolving power 2700 @ F6 2700 @ F8 (with assumption of 1mm beam size) 2nd order correction is successful with use of multi pole coils

Main separator – high resolution mode Angular acceptance 50 mrad in horizontal 50 mrad in vertical Momentum acceptance ~ 6 % Resolving power 2650 @ F6 3650 @ F7 2650 @ F8 (with assumption of 1mm beam size )

LISE++ simulation for PID 5th dipole magnet F9 TOF : PPAC1 @ F5 – Plastic @ F9 ΔE : gas ion chamber @ 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.

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 mm) @ F6 A/Q

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 mm) @ F3 Wedge Degrader d/R = 0.2 (0.86 mm) @ F6 A/Q

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…..

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 degrader @ 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 degrader @ F3 Wedge degrader @ F6 Neutron Number

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 degrader @ 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 degrader @ F3 Wedge degrader @ F6 Neutron Number