Source Parameter Comparison

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Presentation transcript:

Source Parameter Comparison CEBAF JLab/FEL EIC eRHIC MEIC Cornell ERL LHeC CLIC ILC Polarization Yes No Photocathode GaAs / GaAsP Bulk GaAs K2CsSb Width of microbunch (ps) 50 35 100 2 1000 Time between microbunches (ns) 13 106 14.69 0.77 25 0.5002 337 Microbunch rep rate (MHz) 499 75 9.4 68.05 1300 40 1999 3 Number of microbunches CW 220 312 3000 Width of macropulse - 3.233 µs 156 ns 1 ms Macropulse repetition rate (Hz) 2x83 5 Duty Factor 100% 5.4x10-4 7.8x10-6 5x10-3 Number electrons/microbunch 2.5x106 8.3x108 3.3x1010 1.6x108 4.8x108 4x109 6x109 3x1010 Charge per microbunch (pC) 0.4 133 5300 26 77 640 960 4800 Peak current of microbunch (A) 0.008 3.8 53 0.52 38.5 6.4 9.6 4.8 Laser Spot Size (cm, diameter) 0.1 0.5 0.6 0.3 1 Peak current density (A/cm2) 19 188 7.4 500 32 12 6 Average current from gun (mA) 0.2 10 0.001 0.015 0.072 Last updated: March 19, 2015. eRHIC: electron Relativistic Heavy Ion Collider LHeC: Large Hadron electron Collider CLIC: Compact Linear Collider ILC: International Linear Collider --- Why multi-alkali (bulk material, Eg = 1.5 eV) photocathodes are not sensitive to ion bombardment? No NEA activation layer. Why Laser Spot Size? to reduce space-charge emittance growth and suppress surface charge limit eRHIC: 20 photocathodes, 2.5 mA from each How to fill the numbers: Microbunch rep rate = 1.0/Time between microbunches Number of microbunches = Width of macropulse / Time between microbunches For CW machines: Duty Factor = 100% (for CW machines) For pulsed machines: Duty Factor = Width of macropulse * Macropulse repetition rate Charge per microbunch = Number electrons/microbunch * Electron Charge(1.6e-19 C) Peak current of microbunch = Charge per microbunch / Width of microbunch Peak current density = Peak current of microbunch / ( (Laser Spot Size/2)**2 * Pi) Average Current = Charge per microbunch * Microbunch rep rate * Duty Factor

CEBAF JLab/FEL EIC eRHIC MEIC Cornell ERL LHeC CLIC ILC Parameter CEBAF JLab/FEL EIC eRHIC MEIC Cornell ERL LHeC CLIC ILC Polarization Yes No Photocathode GaAs / GaAsP Bulk GaAs K2CsSb Width of microbunch (ps) 50 35 100 2 1000 Time between microbunches (ns) 13 106 14.69 0.77 25 0.5002 337 Microbunch rep rate (MHz) 499 75 9.4 68.05 1300 40 1999 3 Number of microbunches CW 220 312 3000 Width of macropulse - 3.233 µs 156 ns 1 ms Macropulse repetition rate (Hz) 2x83 5 Duty Factor 100% 5.4x10-4 7.8x10-6 5x10-3 Number electrons/microbunch 2.5x106 8.3x108 3.3x1010 1.6x108 4.8x108 4x109 6x109 3x1010 Charge per microbunch (pC) 0.4 133 5300 26 77 640 960 4800 Peak current of microbunch (A) 0.008 3.8 53 0.52 38.5 6.4 9.6 4.8 Laser Spot Size (cm, diameter) 0.1 0.5 0.6 0.3 1 Peak current density (A/cm2) 19 188 7.4 500 32 12 6 Average current from gun (mA) 0.2 10 0.001 0.015 0.072 November 16, 2018