Title Page
Abstract
Contents
Chapter 1. Introduction 14
1.1. Overview of RAON 14
1.2. Functional requirements of beam diagnostics System 17
Chapter 2. Principle of beam instrumentation 18
2.1. Beam Current measurement 18
2.1.1. Faraday cup 18
2.1.2. Current transformer 21
2.2. Beam Profile measurement 22
2.2.1. Wire scanner 22
2.2.2. Beam viewer 23
2.3. Emittance measurement 24
2.3.1. Allison scanner 25
2.3.2. Multi beam profile method 27
2.4. Beam Loss Monitor 30
2.4.1. Plastic detector 30
2.5. Python simulation 31
2.5.1. Wire scanner 31
2.5.2. Multi beam profile scan 34
Chapter 3. Control system for diagnostics system 40
3.1. Experimental Physics and Industrial Control System (EPICS) 41
3.1.1. Process Variables 42
3.1.2. Autosave 46
3.1.3. Sequencer 46
3.1.4. pyEpics 47
3.2. MicroTCA 47
3.3. Programmable Logic Controller (PLC) 50
Chapter 4. Fabrication and Installation of beam diagnostics device 54
4.1. Faraday cup 57
4.2. AC Current transformer 63
4.3. Beam viewer 67
4.4. Wire scanner 69
4.5. Allison scanner 72
4.6. Beam loss collector 77
4.7. Plastic detector 77
Chapter 5. Beam Measurement 81
5.1. Beam Current 84
5.1.1. Faraday cup 84
5.1.2. AC Current transformer 88
5.2. Beam Profile 91
5.2.1. Wire scanner 91
5.2.2. Beam viewer 95
5.3. Beam Emittance 98
5.3.1. Allison scanner 98
5.3.2. Quadrupole scan 100
5.3.3. Multiple scan 105
5.4. Beam Loss 107
5.4.1. Plastic detector 107
5.4.2. Beam loss collector 108
Chapter 6. Conclusion 112
6.1. Summary 112
6.2. Future plan 113
Bibliography 114
국문초록 117
Table 1.1. Specification and quantity of diagnostic devices 17
Table 4.1. Result of SRIM simulation 58
Table 4.2. The inner diameter of Faraday cup 59
Table 4.3. Faraday cup calibration factor 60
Table 4.4. The inner diameter of ACCT 64
Table 4.5. ACCT calibration factor 64
Table 4.6. The fork size of Wire scanner 70
Table 4.7. Specifications of Allison scanner 73
Table 4.8. Specifications of fast scintillator 78
Table 5.1. Current measurement results of Faraday cup 87
Table 5.2. Current measurement results of ACCT 90
Table 5.3. Beam size and position measured by Wire scanner 94
Table 5.4. The analysis results of the Wire scanner and Beam viewer 96
Table 5.5. The specifications of quadrupole magnets 102
Table 5.6. Quadrupole scan measurement result 104
Figure 1.1. Layout of RAON accelerator 15
Figure 1.2. RAON beam diagnostics device layout 16
Figure 2.1. Schematic diagram of a Faraday cup 19
Figure 2.2. Secondary electron emission 20
Figure 2.3. AC current transformer layout 21
Figure 2.4. Wire scanner measurement method 22
Figure 2.5. Schematic diagram of Beam viewer 23
Figure 2.6. Schematic diagram of Allison scanner 25
Figure 2.7. Quadrupole scan method 28
Figure 2.8. Multiple scan method 29
Figure 2.9. Schematic diagram of Plastic detector 30
Figure 2.10. Wire scanner simulation 32
Figure 2.11. Wire scanner current measurement with error study 33
Figure 2.12. Phase space beam distribution 34
Figure 2.13. Quadrupole scan method simulation 36
Figure 2.14. Quadrupole scan error study 37
Figure 2.15. Multiple scan method simulation 38
Figure 2.16. Multiple scan error study 39
Figure 3.1. Beam diagnostics control system 40
Figure 3.2. Diagnostics device configuration 41
Figure 3.3. Schematic structure of EPICS 42
Figure 3.4. Record creation screen using VDCT 42
Figure 3.5. Naming Convention rules at RAON 43
Figure 3.6. Python script for PV alias 44
Figure 3.7. Example of autosave values loaded on IOC reboot 46
Figure 3.8. Example of EPICS sequencer 46
Figure 3.9. MicroTCA system 47
Figure 3.10. ZQ900 control GUI 50
Figure 3.11. PLC-based control panel installed on the rack 51
Figure 3.12. PLC memory mapping for EPICS IOC operation 52
Figure 3.13. Servo motor and control GUI 52
Figure 3.14. Air Cylinder and control GUI 53
Figure 3.15. Power supply relay and control GUI 53
Figure 4.1. Beam diagnostics chamber baking 55
Figure 4.2. SCL3 Chamber baking 56
Figure 4.3. Simulation of copper penetration depth of Argon beam 57
Figure 4.4. Faraday cup installation in beam diagnostics chamber 59
Figure 4.5. Schematic diagram of Faraday cup calibration 60
Figure 4.6. Sequence diagram of the Faraday cup 61
Figure 4.7. ACCT off-line test 63
Figure 4.8. 4 channel ACCT electronics 63
Figure 4.9. ACCT installation and calibration at P2DT 65
Figure 4.10. ACCT amplitude measurement for calibration 66
Figure 4.11. Beam viewer installation at LEBT chamber 67
Figure 4.12. Neptune Viewer Program 68
Figure 4.13. Wire scanner installation at chamber 69
Figure 4.14. Sequence diagram of the Wire scanner 71
Figure 4.15. Drawing of the Allison scanner showing shield A, inlet and outlet slit B, deflection plate C, suppression ring D, faraday cup E and cooling line F 72
Figure 4.16. Photograph of the Allison scanner installation 73
Figure 4.17. PYRAMID's dual fiber loop controller A360 and dual current integrator I400 74
Figure 4.18. Sequence diagram of the Allison scanner 75
Figure 4.19. Beam loss collector at SCL3 Chamber 77
Figure 4.20. Photograph of Plastic detector 78
Figure 4.21. Plastic detector off-line test 79
Figure 4.22. Plastic detector test results (Up) Linearity according to gamma source (Down) Strength according to applied voltage 80
Figure 5.1. Injector main control GUI 81
Figure 5.2. SCL3 main control GUI 82
Figure 5.3. Schematic diagram of chamber interlock 82
Figure 5.4. Summarized GUI of the diagnostic device 83
Figure 5.5. Faraday cup control GUI 84
Figure 5.6. Faraday cup signal rising time by pulse beam 85
Figure 5.7. Trigger setup of ZQ900 EVR interfacing with timing system 85
Figure 5.8. Faraday cup suppression voltage test at LEBT and MEBT 86
Figure 5.9. ACCT electronics control GUI 88
Figure 5.10. Trigger setup of ACCT electronics 89
Figure 5.11. ACCT amplitude measurement at LEBT 89
Figure 5.12. Wire scanner control GUI 91
Figure 5.13. Wire scanner reproducibility test 92
Figure 5.14. Wire scanner measurement at LEBT 93
Figure 5.15. Beam viewer measurements based on beam current 95
Figure 5.16. Beam viewer measurement based on dipole magnet strength 95
Figure 5.17. Beam viewer measurement analysis at ECR32-BV 96
Figure 5.18. Allison scanner control GUI 98
Figure 5.19. Graph of Emittance calculation according to threshold. (Blue point) Selected Threshold at 0.5 nA 99
Figure 5.20. (Left) Allison scanner X (Right) Allison scanner Y 99
Figure 5.21. Lattice structure of MEBT 100
Figure 5.22. Drawing of the quadrupole magnet installed in the MEBT 101
Figure 5.23. The magnetic field measured at a distance of 22.5 mm from the center 102
Figure 5.24. Quadrupole scan method control GUI 103
Figure 5.25. Quadrupole scan fitting graph 104
Figure 5.26. Multiple scan method control GUI 105
Figure 5.27. Multiple scan measurement 105
Figure 5.28. Plastic detector control GUI 107
Figure 5.29. Plastic detector measurement result 107
Figure 5.30. Plastic detector measurement result according to Faraday cup current 108
Figure 5.31. Beam loss collector control GUI 109
Figure 5.32. Beam loss collector measurement 110
Figure 5.33. Beam loss collector measurement at SCL3 111