IFMIF High energy beam line design and beam expansion using non-linear multipole lenses and "step-like" magnet
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1 IFMIF High energy beam line design and beam expansion using non-linear multipole lenses and "step-like" magnet N. Chauvin 1 R. Duperrier 1 P.A.P. Nghiem 1 J. Y. Tang 2 D. Uriot 1 Z.Yang 2 1 Commissariat à l Energie Atomique et aux Energies Alternatives, DSM/Irfu; F Gif-sur-Yvette, France. 2 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China Monday 26 th March 2012 N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 1 / 54
2 Outline 1 IFMIF accelerator overview 2 Beam dynamics simulations for LIPAc 3 Beam dynamics simulations for IFMIF 4 Beam expansion in IFMIF HEBT with high-order multipoles 5 Beam expansion with step-like field magnets (Zheng YANG s work) 6 Conclusions and perspectives N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 2 / 54
3 Outline 1 IFMIF accelerator overview 2 Beam dynamics simulations for LIPAc 3 Beam dynamics simulations for IFMIF 4 Beam expansion in IFMIF HEBT with high-order multipoles 5 Beam expansion with step-like field magnets (Zheng YANG s work) 6 Conclusions and perspectives N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 3 / 54
4 IFMIF principle N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 4 / 54
5 IFMIF & LIPAc IFMIF Accelerator: 2 5 MW Linear IFMIF Prototype Accelerator (LIPAc): MW N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 5 / 54
6 IFMIF accelerator characteristics & orders of magnitude Deuteron beam. Intensity: 125 ma, c.w. (5 40 MeV). Energy: 40 MeV (β = 0.166). Energy: 9 Mev (β = 0.094) for LIPAc. Minimize the losses along the accelerator. Keep a good beam quality. Final beam spot on target mm, with ± 5 % uniformity. N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 6 / 54
7 Outline 1 IFMIF accelerator overview 2 Beam dynamics simulations for LIPAc 3 Beam dynamics simulations for IFMIF 4 Beam expansion in IFMIF HEBT with high-order multipoles 5 Beam expansion with step-like field magnets (Zheng YANG s work) 6 Conclusions and perspectives N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 7 / 54
8 Codes used Linac beam dynamics simulations GenLinWin: SC linac design. Toutatis: RFQ simulation. TraceWin: multi-particles (10 6 particles) simulations in space charge regime. errors studies. LIPAc start-to-end simulations. N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 8 / 54
9 Codes used Linac beam dynamics simulations GenLinWin: SC linac design. Toutatis: RFQ simulation. TraceWin: multi-particles (10 6 particles) simulations in space charge regime. errors studies. LIPAc start-to-end simulations. Source extraction and LEBT simulations AXCEL-INP: source extraction system simulation. SOLMAXP: Self-consistant code to simulate beam transport with space charge compensation. Simulation of the physical processes that occur in the LEBT (ionisation, secondary electrons, charge exchange). N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 8 / 54
10 The LIPAc injector Main parameters D + beam. Energy : 100 kev. Intensity : 140 ma. Final emittance : 0.25 π mm.mrad IFMIF injector SILHI-like source. 4 electrodes extraction system. LEBT with 2 solenoids. Kr injection in the LEBT for space charge compensation. Total lenght: 2.05 m N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 9 / 54
11 LIPAc injector beam dynamics results LEBT output: ɛ RMS = 0.16 π mm.mrad RFQ transmission: 96 % ( 5 % mismatch ) N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 10 / 54
12 LIPAc RFQ (M. Comunian, INFN Legnaro) Some RFQ parameters Frequency: 176 MHz. Input energy: 100 kev. Output energy: 5 MeV. Total length: m. Number of cells: 486. Maximum modulation: 1.8. Minimum aperture: 3.47 cm. Maximum field: 24.7 MV/m (1.76 kp). N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 11 / 54
13 RFQ beam dynamics results (M. Comunian, INFN Legnaro) RFQ transmission: 96 % Output emittance: ɛ trans. = 0.20 π mm.mrad. ɛ long. = 0.47 π mm.mrad. N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 12 / 54
14 LIPAc Medium Energy Beam Transport line MEBT purposes Transport the beam from the RFQ to the SC linac. Adapt the beam for the linac (longitudinally and transversally). Beam scrapping. MEBT elements 5 quadrupoles. 2 bunchers. 4 BPMs. 3 scrappers. Total length: 2.18 m N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 13 / 54
15 LIPAc superconducting accelerating section Specifications Acceleration from 5 MeV to 9 MeV. Beam intensity : 125 ma. Minimize the beam losses (< 1 W/m). SC section 1 cryomodule. 8 periods. Trans. focusing: 1 solenoid/period. Acceleration: 1 HWR cavitiy/period (β = 0.094). N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 14 / 54
16 LIPAc MEBT and SC section BD results Beam Density X plane N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 15 / 54
17 LIPAc MEBT and SC section BD results Beam Density Y plane N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 15 / 54
18 LIPAc High Energy Beam Transport line (designed by C. Olivier, CIEMAT Madrid) HEBT purposes Beam diagnostics ("D plate") for LIPAc characterisation. Beam transport to the beam dump. Beam expansion to the beam dump ( 300 W/cm 2 ). N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 16 / 54
19 LIPAc HEBT beam dynamics results R beam density N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 17 / 54
20 LIPAc HEBT beam dynamics results Linear scale Log. scale Beam distribution on the beam dump N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 18 / 54
21 LIPAc start-to-end dynamics results R beam density N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 19 / 54
22 Outline 1 IFMIF accelerator overview 2 Beam dynamics simulations for LIPAc 3 Beam dynamics simulations for IFMIF 4 Beam expansion in IFMIF HEBT with high-order multipoles 5 Beam expansion with step-like field magnets (Zheng YANG s work) 6 Conclusions and perspectives N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 20 / 54
23 IFMIF superconducting accelerating section Specifications Acceleration from 5 MeV to 40 MeV. Beam intensity : 125 ma. Minimize the beam losses (< 1 W/m). SC linac parameters 4 cryomodules. Transverse focusing: solenoids. 2 types of HWR cavities (β = et β = 0.166) N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 21 / 54
24 IFMIF superconducting linac Cryomodules & 4 Cavity β Cavity Length (mm) Beam Aperture (mm) Nb cavity/period Nb cavity/cryostat Cryostat Length (m) Output Energy (MeV) /40 Beam dynamics optimisations Beam in the MW range and losses < 1 W/m simulations with at least 10 6 particles. Optimisations losses minimization ("halo matching" rather than "RMS matching"). N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 22 / 54
25 IFMIF SC-linac beam dynamics results Beam density with "RMS matching" N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 23 / 54
26 IFMIF SC-linac beam dynamics results Beam density with "halo matching" N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 23 / 54
27 IFMIF SC-linac beam dynamics results Final Transverse emittance: 0.45 πmm.mrad. N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 24 / 54
28 IFMIF SC-linac beam dynamics results Beam distribution after the IFMIF SC-linac. N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 25 / 54
29 Outline 1 IFMIF accelerator overview 2 Beam dynamics simulations for LIPAc 3 Beam dynamics simulations for IFMIF 4 Beam expansion in IFMIF HEBT with high-order multipoles 5 Beam expansion with step-like field magnets (Zheng YANG s work) 6 Conclusions and perspectives N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 26 / 54
30 IFMIF HEBT Requirements Transport the 125 ma 40 MeV beam from the linac to the Li target. Beam footprint: rectangular with dimensions of mm. Beam homogenity: 5% (to be reconsidered). Minimizing beam losses in the HEBT. Bending angle to protect the accelerator from the back streamed neutrons. Simulations Multi-particles simulations are necessary. Recent development of a new diagnostic for TraceWin: MY_DIAG(Beam_Homogeneity) n Target_Value Dimension_X Dimension_Y Relative_Weight_Dimension/homogenity N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 27 / 54
![IFMIF HEBT Design based on non-linear multipoles[duperrier et al., 2004]. R. Duperrier, J. Payet and D. Uriot (2004).](/docs-images/95/125053819/images/31-1.jpg "The IFMIF High Energy Beam Transport line. In Proceedings of EPAC 2004, Lucerne, Switzerland. N. Chauvin et al.")
31 IFMIF HEBT Design based on non-linear multipoles[duperrier et al., 2004]. R. Duperrier, J. Payet and D. Uriot (2004). The IFMIF High Energy Beam Transport line. In Proceedings of EPAC 2004, Lucerne, Switzerland. N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 28 / 54
32 Non-linear Multipole field maps 1D Field Maps Duodecapoles 50 mm radius Octupoles 50 & 80 mm radius N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 29 / 54
33 Non-linear Multipole field maps 2D Field Maps Duodecapoles 50 mm radius Octupoles 50 & 80 mm radius N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 29 / 54
34 Beam Envelope (3σ) in IFMIF HEBT N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 30 / 54
35 Beam Density in IFMIF HEBT Beam Density X plane N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 31 / 54
36 Beam Density in IFMIF HEBT Beam Density Y plane N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 31 / 54
37 Power lost in the IFMIF HEBT Total power lost: kw Losses on scrappers N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 32 / 54
38 Beam Distribution on target Log. scale N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 33 / 54
39 Beam Distribution on target Log. scale Linear scale N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 33 / 54
40 Beam Distribution on target Log. scale Linear scale N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 34 / 54
41 Errors study Errors applied (orders of magnitude) Static errors: Magnetic elements Misalignment [x,y] : ±0.1 mm. Magnetic elements Tilt [ϕ x,ϕ y ]: ±0.5 mrad Magnetic elements Tilt [ϕ z ]: ±8.7 mrad Magnetic elements Gradient: ±0.25 % BPMs Measurement Accuracy: ±0.1 mm Dynamic errors: 10% of the static errors. Monte-Carlo simulation method: 10 6 particles through 200 HEBTs. Correction scheme 12 steerers and 12 BPMs in the beam line (working by pairs). Orbit correction. No re-tuning of the magnetic elements. N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 35 / 54
42 IFMIF HEBT: Errors study results Beam Density X plane WITHOUT error N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 36 / 54
43 IFMIF HEBT: Errors study results Cumulated Beam (200 runs) Density X plane WITH errors N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 36 / 54
44 IFMIF HEBT: Errors study results Beam Density Y plane WITHOUT error N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 36 / 54
45 IFMIF HEBT: Errors study results Cumulated (200 runs) Beam Density Y plane WITH errors N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 36 / 54
46 IFMIF HEBT: Errors study results Cumulated beam distribution (200 runs) on target Log. scale Cumulated beam distribution (200 runs) on target Linear scale N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 37 / 54
47 IFMIF HEBT: Errors study results Cumulated beam distribution (200 runs) on target Log. scale Cumulated beam distribution (200 runs) on target Linear scale N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 38 / 54
48 IFMIF HEBT with non-linear multipoles: Pros and Cons Pros Well-known solution. Flexibility of the beam line (tuning). Cons The beam line tuning is challenging. Small radius of the non-linear elements. Beam scrapping is needed. N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 39 / 54
49 IFMIF HEBT with non-linear multipoles: to be studied More optimizations for the presented HEBT design are needed. A new design with a shorter/simpler HEBT will be proposed: N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 40 / 54
50 Outline 1 IFMIF accelerator overview 2 Beam dynamics simulations for LIPAc 3 Beam dynamics simulations for IFMIF 4 Beam expansion in IFMIF HEBT with high-order multipoles 5 Beam expansion with step-like field magnets (Zheng YANG s work) 6 Conclusions and perspectives N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 41 / 54
![IFMIF HEBT with SFM magnets (Zheng YANG) Design based on Step-Like Field non-linear Magnets [Tang et al., 2004]. B x = B 0 1 + e b( x X0) J.Y. Tang, H. H. Li, S.Z. An, and R. Maier (2004).](/docs-images/95/125053819/images/51-0.jpg "Distribution transformation by using step-like nonlinear magnets.")
51 IFMIF HEBT with SFM magnets (Zheng YANG) Design based on Step-Like Field non-linear Magnets [Tang et al., 2004]. B x = B e b( x X0) J.Y. Tang, H. H. Li, S.Z. An, and R. Maier (2004). Distribution transformation by using step-like nonlinear magnets. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 532(3): N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 42 / 54
52 IFMIF HEBT design with SFM magnets (Z. YANG) N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 43 / 54
53 IFMIF HEBT design with SFM magnets (Z. YANG) N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 43 / 54
54 Step-Like Field magnet field map (Z. YANG) N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 44 / 54
55 Beam Envelope (3σ) in IFMIF HEBT (Z. YANG) N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 45 / 54
56 Beam Density in IFMIF HEBT (Z. YANG) Beam Density X plane N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 46 / 54
57 Beam Density in IFMIF HEBT (Z. YANG) Beam Density Y plane N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 46 / 54
58 Beam Distribution on target (Z. YANG) Log. scale Linear scale N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 47 / 54
59 Beam Distribution on target (Z. YANG) Log. scale Linear scale N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 48 / 54
60 IFMIF HEBT with SFM: Errors study results (Z. YANG) Beam Density X plane WITHOUT error N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 49 / 54
61 IFMIF HEBT with SFM: Errors study results (Z. YANG) Cumulated (200 runs) Beam Density X plane WITH errors N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 49 / 54
62 IFMIF HEBT with SFM: Errors study results (Z. YANG) Beam Density Y plane WITHOUT error N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 49 / 54
63 IFMIF HEBT with SFM: Errors study results (Z. YANG) Cumulated (200 runs) Beam Density Y plane WITH errors N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 49 / 54
64 IFMIF HEBT with SFM: Errors study results (Z. YANG) Cumulated beam distribution (200 runs) on target Log. scale Cumulated beam distribution (200 runs) on target Linear scale N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 50 / 54
65 IFMIF HEBT with SFM: Errors study results (Z. YANG) Cumulated beam distribution (200 runs) on target Log. scale Cumulated beam distribution (200 runs) on target Linear scale N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 51 / 54
66 IFMIF HEBT with Step-Like Field Magnets : Pros and Cons Pros Cons "Easier" beam line tuning. Large beam pipe aperture (low field). Steps can be adapted to the beam halo. STM are easy to manufacture. Slope (b) and step position (X 0 ) are fixed. Non-homogeneous zone seems to be in the center of the footprint. N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 52 / 54
67 Outline 1 IFMIF accelerator overview 2 Beam dynamics simulations for LIPAc 3 Beam dynamics simulations for IFMIF 4 Beam expansion in IFMIF HEBT with high-order multipoles 5 Beam expansion with step-like field magnets (Zheng YANG s work) 6 Conclusions and perspectives N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 53 / 54
68 Conclusions and Perspectives Conclusions Two methods have been tested to expand the beam on the IFMIF liquid Lithium target. The step-like field magnets solutions looks very promising. A diagnostic has been implemented for TraceWin to optimize the beam line parameters. N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 54 / 54
69 Conclusions and Perspectives Conclusions Two methods have been tested to expand the beam on the IFMIF liquid Lithium target. The step-like field magnets solutions looks very promising. A diagnostic has been implemented for TraceWin to optimize the beam line parameters. Perspectives More optimizations have to be performed. Design of shorter and simpler beam HEBTs. HEBT tuning feasibility with real beam diagnostics. Develop beam diagnostics suitable for high radiation environment. N. Chauvin et al. IFMIF HEBT Aarhus, Denmark 54 / 54
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