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Study of the Interaction of Charged Ions with Matter - Development of Charge stripper and IF production Target at RISP

DC Field Value Language
dc.contributor.advisor최선호-
dc.contributor.author송정석-
dc.date.accessioned2017-07-19T06:10:48Z-
dc.date.available2017-07-19T06:10:48Z-
dc.date.issued2016-02-
dc.identifier.other000000133211-
dc.identifier.urihttp://dcollection.snu.ac.kr:80/jsp/common/DcLoOrgPer.jsp?sItemId=000000133211-
dc.description학위논문(박사)--서울대학교 대학원 :자연과학대학 물리·천문학부,2016. 2. 최선호.-
dc.description.abstractIn this thesis paper, we had studied on three different topics which are charged
ion interaction with matter, liquid lithium charge stripper and IF production
target.
In RAON accelerator, prediction of charge state distribution of the uranium
primary beam with 18 MeV/u energy and 33+ charge state after passing
through liquid lithium film is one of the important issue. Estimation of thickness
of film thickenss is also required to reach wanted averaged charge state of
79+. Since the charge state distribution of the uranium beam at the stripper
energy of 18 MeV/u from a lithium film is not experimentally known, simulation
methods are being developed. The simulation method is based on the
further development of the ETACHA code in collaboration with the ETACHA
group at the Institut des NanoSciences de Paris. In previous ETACHA4, number
of shell was considered up to n=4, 60 electrons. ETACHA4E(extended
version of ETACHA4) optimized with experimental data is improved to consider
up to n=7. The excitation cross section is also rescaled with considering
contribution of n=8 shell. We modified ETACHA4 and obtained the accuracy
of the averaged charge state less than 1 % compared with experimental data
in the energy region of ∼ 10 MeV/u. At the RAON energy, the thickness of
lithium film is to be 1mg/cm2 to reach the 79+ of charge state for uranium
beam.
In this thesis paper, we had studied on three different topics which are charged
ion interaction with matter, liquid lithium charge stripper and IF production
target.
In RAON accelerator, prediction of charge state distribution of the uranium
primary beam with 18 MeV/u energy and 33+ charge state after passing
through liquid lithium film is one of the important issue. Estimation of thickness
of film thickenss is also required to reach wanted averaged charge state of
79+. Since the charge state distribution of the uranium beam at the stripper
energy of 18 MeV/u from a lithium film is not experimentally known, simulation
methods are being developed. The simulation method is based on the
further development of the ETACHA code in collaboration with the ETACHA
group at the Institut des NanoSciences de Paris. In previous ETACHA4, number
of shell was considered up to n=4, 60 electrons. ETACHA4E(extended
version of ETACHA4) optimized with experimental data is improved to consider
up to n=7. The excitation cross section is also rescaled with considering
contribution of n=8 shell. We modified ETACHA4 and obtained the accuracy
of the averaged charge state less than 1 % compared with experimental data
in the energy region of ∼ 10 MeV/u. At the RAON energy, the thickness of
lithium film is to be 1mg/cm2 to reach the 79+ of charge state for uranium
beam. at 50m/s bombarded by a 65 keV, 300W proton beam was successfully tested
at ANL to test the validation of lithium film as as charge stripper.
Study on the production target of in-flight fragment separator has been
performed for a high power rare isotope facility planned in Korea. The maximum
power of the primary beam is designed to be 400 kW, and the heat
deposit on the target can reach a hundred kW. We consider a graphite multislice
rotating system to maintain maximum target temperature below 1900
deg. Only radiation cooling is effective for this rotating target. Thickness of
the target optimized for the maximum yield of 132Sn isotope is calculated to be
0.45g/cm2 and deposited heat is 132 kW. Target system should last at least a
couple of weeks before exchange to a new unit for nuclear physics experiments.
We have studied thermo-mechanical behavior assuming variations of thickness
of graphite target from 0.1 to 1mm, and of the diameter from 13cm to 30cm.
The results were simulated using PHITS, LISE++ and ANSYS. By using the
simulation results, we built the 1st IF production target with the diameter of
140mm and thickness of 0.2mm and tested by 70 keV, 1kW electron beam at
local company EBTech. The maximum temperature reached to 800 oC. And
we are now preparing 2nd prototype IF production target with a the diameter
of 140mm and thickness of 0.2mm. In near future 2nd prototype will be test
with 1MeV, 100kW electron beam at BINP.
We are expecting that the charge stripper and IF production target will be
installed and operated for RAON accelerator based on these researches.		-
dc.description.tableofcontentsChapter 1 Introduction 1
1.1 Rare isotope beam production 3
1.2 Next generation heavy ion accelerator 5
1.3 RISP overview 7
1.3.1 Concept of RAON accelerator 8
1.4 Charge stripper at bending section 9
1.5 IF prodction target for In-Flight Fragment separator 10
1.6 Technical challenges 12

Chapter 2 Interaction of Charged Ions with Matter 13
2.1 Introduction 13
2.1.1 Charge exchange process 13
2.1.2 Empirical fomula-based model 14
2.1.3 Atomic physics-based model 17
2.1.4 Motivation 18
2.2 Charge state distribution calculation 21
2.2.1 Heavy ion charge exchange interaction with matter 21
2.2.2 Cross sections for electronic processes 22
2.2.3 Simulation of charge state evolution 24
2.2.4 Energy loss 25
2.2.5 Density effect 26
2.2.6 Equilibrium charge state 27
2.2.7 Evolution of charge state distribution 30
2.3 Extension of ETACHA4 31
2.3.1 Current status of ETACHA4 31
2.3.2 Improvement of ETACHA4 beyond n=4 shell 34
2.3.3 Binding energy criterion 43
2.3.4 Results 44
2.4 Application 45
2.4.1 Single atomic target 45
2.4.2 Sandwich target 47
2.4.3 Compound target 48
2.4.4 Carbon and lithium stripper for RISP 50
2.5 Summary 52

Chapter 3 Charge stripper 53
3.1 Introduction 53
3.1.1 Role of the charge stripper 53
3.2 Concept of the charge stripper at RISP 55
3.3 Liquid lithium stripper 55
3.3.1 Liquid lithium film formation 55
3.3.2 Main chamber, nozzle and deflector 56
3.3.3 Film thickness measurement system 60
3.3.4 Heating system 63
3.3.5 Vacuum system 65
3.3.6 Electromagnetic pump 66
3.4 Proton beam on liquid lithium film Experiment 77
3.4.1 Experimental setup 77
3.4.2 Experimental procedures 78
3.4.3 Results 78
3.4.4 Discussion 79
3.5 Summary 81

Chapter 4 IF Production Target 82
4.1 Introduction 82
4.1.1 Solid production target for High power beam 82
4.2 Concept of IF production target 83
4.2.1 Optimized target thickness 83
4.2.2 Power deposit on the target: 238U vs electron 85
4.3 Single-slice graphite target experiment 86
4.3.1 Design of rotating target system 86
4.3.2 Hot spot temperature calculation and measurement 87
4.3.3 Conclusion and discussion 92
4.4 Muti-slice grphite target 93
4.4.1 Introduction 93
4.4.2 Rotating system 93
4.4.3 Simulation of deposited heat and target surface thermal analysis 94
4.5 Summary 104

Chapter 5 Conclusion and Discussion 105

Appendix 108
Appendix A Charge state distribution 108
Appendix B IF production target 114
Appendix C Magnetic field analysis code based on RIKEN method 117
C.1 Basis of 3D Mapper using RIKEN algorithm 117
C.2 Details of RIKEN numerical procedure 117
C.3 Test of method using RISP simulation data 119
C.3.1 How to run the code 119
C.3.2 How to save the data set 122
C.4 Test results 124
C.4.1 quadurupole only. 7002-B, 7006-B and 7008-B 124
C.4.2 with sextupole. 9001-B and 9033-B 125
C.5 Comparison with data in RIKEN paper 130
C.6 Extraction method of 3D maps of magnetic multipoles from 2D surface measurement 131

Bibliography 144

국 문 초 록 147		-
dc.format.extent170-
dc.language.isoeng-
dc.publisher서울대학교 대학원-
dc.subjectCharge state, ETACHA, charge stripper, IF production target, RISP-
dc.subject.ddc523-
dc.titleStudy of the Interaction of Charged Ions with Matter - Development of Charge stripper and IF production Target at RISP-
dc.typeThesis-
dc.typeDissertation-
dc.contributor.department자연과학대학 물리·천문학부-
dc.description.degreeDoctor-
dc.date.awarded2016-02-
dc.identifier.holdings000000000027▲000000000027▲000000133211▲-
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