A Brachmann

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Published on October 9, 2007

Author: Alien

Source: authorstream.com

The Polarized Electron Source for the International Collider (ILC) Project:  The Polarized Electron Source for the International Collider (ILC) Project A. Brachmann, Y. Batygin, J.E. Clendenin, E.L. Garwin, K. Ioakeimidi, R.E. Kirby, T. Maruyama, J. Sheppard, F. Zhou, C.Y. Prescott - SLAC - Outline:  Outline Introduction Parameters Layout R&D and Design Status, Future Plans ILC Schedule:  ILC Schedule End of ’06 : Reference Design Report End of ’09: Technical Design Report In 2010: Decision expected from funding agencies In 2012: Begin of construction ILC Design Strategy:  ILC Design Strategy International Collaboration (Americas, Europe, Asia) Global Design Effort is interaction of: Area Systems (e.g. e- source, e+ source, linac, BDS, etc) Technical Systems (e.g. Magnet system, Vacuum system, instrumentation, etc.) Global Systems (e.g. Installation, Conventional facilities) Currently, cost of machine is evaluated and alternative designs are investigated to reduce overall cost Polarized Source Parameters:  Polarized Source Parameters ILC Pulse Train Illustration:  ILC Pulse Train Illustration Schematic Layout:  Schematic Layout Low Energy Beam Line and Bunching System Simulations including Space Charge:  Low Energy Beam Line and Bunching System Simulations including Space Charge Two 5-cell SW L-band 108MHz SHB 433 MHz SHB 1st TW Structure 2nd TW Structure matching triplet Physical Beam Line Layout:  Physical Beam Line Layout Superconducting Linac (5 GeV) Spin rotation (SC Solenoid)  RF energy compression  Combining Dogleg and Collimation Spin Rotation using Solenoids :  Spin Rotation using Solenoids 5 GeV Bend of n * 7.9312o Odd Integer Slongitudonal ~ 7.5 m ILC design: n = 7  55.51o Depolarization in arc due to energy spread: Arc bending angle θ = 55.51o Spin precession angle  =(7/2) Energy spread Δ/ = ±0.02 GeV Depolarization (analytic) ΔP/P = 0.024 Particle tracking ΔP/P = 0.007 ILC e- Source Facilities Layout :  ILC e- Source Facilities Layout R&D for the Polarized Electron Source (not limited to activities @ SLAC):  R&D for the Polarized Electron Source (not limited to activities @ SLAC) Laser Development Laser system beyond state of the art Challenge is 3 MHz amplification Demonstrate photocathode performance Photocathode Development  See talks by T. Maruyama, K. Ioakeimidi Gun Development DC gun: Improved HV performance Polarized RF gun: explore feasibility of polarized RF gun  See talk by J. Clendenin Source Laser System:  Source Laser System Laser Pulse Energy and Laser Power:  Laser Pulse Energy and Laser Power Cathode QE requires 2-10 μJ per micro pulse Modest total average power: ~ 70 mW 2820 pulses, 5 Hz, 5 μJ Average power in 1 ms burst: ~ 15 W 3 MHz, 5 μJ Need to design ~ 15 W average power amplifier system Crystal cooling cryogenic (power dissipation, thermal lensing) Slide15:  Laser System Schematic Photocathodes QE Profile Variation vs. Time:  Photocathodes QE Profile Variation vs. Time August ‘03 June ‘05 August ‘06 Cathode is SVT4249 (strained layer GaAs/GaASP, 2cm diameter), installed in SLAC’s polarized gun, serving main LINAC. Cathode can deliver charge QE profile degradation is obvious Further investigation under ILC conditions is needed QE Profile August ’06 (Slice through Cathode Center):  QE Profile August ’06 (Slice through Cathode Center) Number of Electrons generated from cathode installed for 3 years (August ‘06):  Number of Electrons generated from cathode installed for 3 years (August ‘06) ILC at IP (3.2 nC) ILC at source (6.4 nC) Gun Development:  Gun Development Baseline design: SLC Gun at 120 keV Higher Voltage Gun allows shorter bunches reduces requirements for bunching system and can improve timing flexibility due to possible elimination of 108 MHz SHB Examples for higher voltage guns are: 200 keV @ Nagoya 350-500keV @ JLab, Cornell R&D for Polarized RF Gun is being considered See talk by J. Clendenin Gun development for the ILC source design is part of our proposal for ILC R&D work Summary and Conclusions:  Summary and Conclusions SLC source design is a good starting point for ILC ILC parameters are different  R&D needed Demonstrate cathode performance under ILC conditions ILC project contributes to advance the state of the art of polarized sources e- source is relatively small but important ILC R&D effort

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