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We have achieved current densities high enough to build tabletop FELs • Photocurrent was – Up to 100 mA – Shorter pulse than laser – Limited by damage to needle • 4th harmonic Nd:YAG at 266 µm with 7 ns, 200 mJ pulse • Quantum efficiency is increased by 10 2 by laser
Needle cathode e-beam has high brightness normalized brightness (A/m 2 -steradian) 10 16 10 14 10 12 10 10 10 8 0.0001 0.001 0.01 0.1 1 10 100 1000 rf photoinjectors current (A) storage rings field emission thermionic emission photoelectric field emission
Page 1 and 2: Progress on the Vanderbilt Table To
Page 3 and 4: WANTED: a narrowband THz source for
Page 5 and 6: Examine protein secondary structure
Page 7 and 8: How this compares to other THz sour
Page 9: Experimental apparatus
Page 13 and 14: Dimensions of the aluminum grating
Page 15 and 16: • Evanescent wave: Details of las
Page 17 and 18: Amplitude growth rate, µ (m -1 ) 6
Page 19 and 20: Net gain (m -1 ) 200 150 100 50 Net
Page 21 and 22: Angular power (nW/steradian) 160 14
Page 23 and 24: We will conduct the following exper

slides - CASA

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