summary of accelerator system (wg2) 김귀년 경북대학교. presentations for wg2 -polarized...
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![Page 1: Summary of Accelerator System (WG2) 김귀년 경북대학교. Presentations for WG2 -Polarized Electron Source for ILC in Korea - ( 김귀년 ( 경북대 ), 박성주 (PAL)) - ILC](https://reader036.vdocuments.mx/reader036/viewer/2022082818/56649f065503460f94c1b05c/html5/thumbnails/1.jpg)
Summary of Accelerator System (WG2)
김귀년 경북대학교
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Presentations for WG2
-Polarized Electron Source for ILC in Korea
- ( 김귀년 ( 경북대 ), 박성주 (PAL))
- ILC Bunch Compressor 의 현황과 계획
- ( 손동철 , 김유종 ( 경북대 ) )
- Beam dynamics on Damping Rings and Beam-Beam Interaction
- ( 김은산 (PAL))
-General Idea on ILC Beam Diagnostics
- ( 황정연 (PAL))
-ILC 를 위한 PAL 에서의 facility 제안
- ( 손동철 ( 경북대 ))
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pre-linac
Damping ring
Bunch compressor
linac
Beam delivery
Interaction region
Source
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Specifications for ILC polarized electron source
Parameters units TESLA-TDR NLC/GLC
US-COLDGun bunch charge nC (#e-)4.5 (2.8×1010)Polarization % > 80Bunch length ns 2 0.7Cathode bias voltage kV -120Beam radius mm 12# bunches / pulse 2820 192Bunch spacing ns 337 1.4Pulse length µs 950 0.27Repetition rate Hz 5 120
1. Polarized Electron Source
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Korea’s Capabilities Relevant to ILC Injcetors
1. PES Test Stand• GaAs-NEA Photocathode Production• Compact Mott Polarimeter• Electrostatic Bend• PEGGY Source (provided by the SLAC)
2. PAL XFEL Injector• GTS (Gun Test Stand)
– BNL Gun-IV-type 1.6-Cell RF Gun– Ti:Sapphire Laser– Dedicated RF Source– Beam Diagnostics
• PPI (Pohang Photo-Injector)
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4. Special facilities for klystron fabrication• XHV Baking Station• Various Furnaces• HP Microwave Test-Lab
5. Infra-Structures• Chemical Cleaning Shop, Plating Facility, Welding Shop, 3D CM
M,…• Magnetic Field Measurement Facilities• Full-line of Microwave Equipments
6. High-Quality Manpowers• Beam-Dynamics Experts• Mechanical Engineers• High-Power Electrical Engineers• RF Engineers (LL & HL)• XHV Experts• were involved in the PLS construction, now in the PAL XFEL pr
oject
Korea’s Capabilities Relevant to ILC Injcetors- Continued -
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2. Newly Proposed Bunch Compressor for ILC by Y. Kim
Final parameters
E = 6.0 GeV = 2.173%z = 300 m nx= 8.7 m, ny= 0.02 m
z = 6.00 mm 673 m 300 m
ACC1 ACC2 ACC4
Q=3.2 nC e-beam
23.4 MV/m-45 deg
24.8 MV/m170.0 deg
ACC5 ACC6ACC3BC1
E = 5.689 GeV ~ 2.4%R56 = 236 mm = 5.3 deg
E = 6.0 GeV ~ 2.174%R56 ~ 17 mm ~ 1.4 deg
BC2
13.3 MV/m-21.5 deg
Up to main linac : ELEGANT with CSR, ISR, and geometric short-range wakefields.but without space charge
Initial parameters
E = 5.0 GeV = 0.13% (small !)z = 6.0 mm nx= 8.0 m, ny= 0.02 m
1/8.9 1/2.2
Damping Ring
ACC39
Oral Talk at 1st ILC Workshop, KEK, Japan
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3. Possible things for damping ring design of ILC-ASIA
• Optics• * Lattice design ( suggested dogbone and small DR ) • * Effects of edge field of wigglers on dynamic aperture• * Tune survey • * Optics/dispersion correction with space charge• * Tolerances for the emittance
• Tracking simulations• * Emittance growth and particle loss due to space charge.• * Effects of wakes in damping rings• * Multi-bunch instabilities due to superconducting RF cavities• * Electron cloud instabilities and ion instability.• * Wiggler effects on beam parameters
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Quantity of ILC Quantity of ILC MonitorsMonitors
BPMBeam
Profile(size)
Bunch Length
Beam sources
500 40 10
Linac 2200 24 ?
Damping Ring
1000 8 10
Beam Delivery system
300 ? 8
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Most critical measurements for Linear Collider
nanometer beam position measurement near IP (σz ~ 1000 - 5 nm)
-best cavity BPM (cBPM) ~ 25 nm
-best stripline BPMs (sBPM) ~ 1 μm
nanometer beam size measurement at IP
- best laser wire scan ~100 nm
- best metal wire scan ~ 5 μm
- laser interference slit scan ~ 50 nm (Shinta
ke)
resolution limited by wavelength
fs bunch length measurement
- electro-optic/ CSR, CTR/ rf deflector ~30 fs
Various techniques for PAL XFEL will be also applicable for ILC
Requirements and Status of ILC DiagnosticsRequirements and Status of ILC Diagnostics4. Beam Diagnostics
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Major parameters
Injector BC Undulator Remarks
Beam Energy 150 MeV 442 MeV 3,000 MeV
Beam Charge 1.0 nC 1.0 nC 1.0 nC0.1% 1 pC
Bunch Length
900 μ m (3 ps) 110 μ m (300 fs) 25 μ m (80 fs)σz rms
3μ m (10fs)
Beam Size (135, 125) μ m (115, 100) μ m (68, 62) μ m (σx, σy)
5μ m
Beam Emittance 1.0 μ m 1.0 μ m ~1.0 μ m 10%
Beam position
∓ 10 μ m ∓ 10 μ m ∓ 2 μ m
Beam parameters for PAL-XFEL Beam parameters for PAL-XFEL diagnosticsdiagnostics
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포항가속기연구소 선형가속기 남서쪽 부지
• 1) 선형충돌가속기 편극전자 /양전자 빔원 및 빔압축장치 시험 시설 (LC-PEPS: Linear Collider Polarized Electron and Positron Sources)
• 2) 고에너지입자검출기 빔 시험 시설 및 초전도가속관 제작 시험 시설 (HEP-BTF: High Energy Particle Detector Beam Test Facility) – ▶ 고에너지 전자 빔 및
기타 제 2 차 입자 시험 빔– ▶ 초전도가속관 제작 및
시험 시설
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Conventional vs. Gamma Based Positron Source
Target
Photons 10-20 MeV
Electrons 0.1-10 GeV
Primary Beam Capture Optics
thin target: 0.4 X0
thick target: 4-6 X0
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Pohang Accelerator Lab.
Laser Compton Scattering Beam Line using Pohang Linac
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Summary of WG2
1.Polarized Electron Source:
2. Damping Ring
3. Bunch Compressor:
4. Beam diagnosticsdiagnostics
5. Test Facility for ILC at PAL5. Test Facility for ILC at PAL