1. Summary of Accelerator System (WG2) 김귀년 경북대학교

2. 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 ))

3. pre-linac Damping ring Bunch compressor linac Beam delivery Interaction region Source

4. Specifications for ILC polarized electron source ParametersunitsTESLA-TDRNLC/GLC US-COLD Gun bunch chargenC (#e-)4.5 (2.8×10 10 ) Polarization%> 80 Bunch lengthns20.7 Cathode bias voltagekV-120 Beam radiusmm12 # bunches / pulse2820192 Bunch spacingns3371.4 Pulse lengthµs9500.27 Repetition rateHz5120 1. Polarized Electron Source

5. 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)

6. 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 CMM,… 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 project Korea’s Capabilities Relevant to ILC Injcetors - Continued -

7. 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/m 170.0 deg ACC5ACC6ACC3 BC1 E = 5.689 GeV   ~ 2.4% R 56 = 236 mm  = 5.3 deg E = 6.0 GeV   ~ 2.174% R 56 ~ 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 1 st ILC Workshop, KEK, Japan

8. 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

9. Quantity of ILC Monitors BPM Beam Profile(size) Bunch Length Beam sources5004010 Linac220024? Damping Ring1000810 Beam Delivery system 300?8

10. Most critical measurements for Linear Collider  nanometer beam position measurement near IP (σ z ~ 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 (Shintake) 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 Diagnostics 4. Beam Diagnostics

11. Major parameters InjectorBCUndulatorRemarks Beam Energy150 MeV442 MeV3,000 MeV Beam Charge1.0 nC 0.1% 1 pC Bunch Length900 μm (3 ps)110 μm (300 fs)25 μm (80 fs) σ z rms 3μm (10fs) Beam Size(135, 125) μm(115, 100) μm(68, 62) μm (σ x, σ y ) 5μm Beam Emittance1.0 μm ~1.0 μm10% Beam position ∓ 10 μm ∓ 2 μm Beam parameters for PAL-XFEL diagnostics

12. 포항가속기연구소 선형가속기 남서쪽 부지 1) 선형충돌가속기 편극전자 / 양 전자 빔원 및 빔압축장치 시험 시설 (LC-PEPS: Linear Collider Polarized Electron and Positron Sources) 2) 고에너지입자검출기 빔 시험 시설 및 초전도가속관 제작 시 험 시설 (HEP-BTF: High Energy Particle Detector Beam Test Facility) – ▶ 고에너지 전자 빔 및 기타 제 2 차 입자 시험 빔 – ▶ 초전도가속관 제작 및 시 험 시설

13. Conventional vs. Gamma Based Positron Source Target Photons 10-20 MeV Electrons 0.1-10 GeV Primary BeamCapture Optics thin target: 0.4 X 0 thick target: 4-6 X 0

14. Pohang Accelerator Lab. Laser Compton Scattering Beam Line using Pohang Linac

15. Summary of WG2 1.Polarized Electron Source: 2. Damping Ring 3. Bunch Compressor: diagnostics 4. Beam diagnostics 5. Test Facility for ILC at PAL