Schematic of the BNL/SLAC/UCLA type 1.6 cell photocathode RF gun.
Variation in β π with length of RF coupling slot (L 1), for a constant radius of full- and half-cells.
Variation in f π with length of RF coupling slot (L 1) for constant radius of full- and half-cell tuned for f π of 2856 MHz for very small values of β π , and with e b ∼1.
Variation in e b of π-mode with length of RF coupling slot (L 1).
Variation of f π with radius of the full-cell for a constant length of RF coupling slot (L 1) for which β π = 1.
Variation in e b of the π-mode with radius of full-cell, for a constant length of the RF coupling slot (L 1) for which β π = 1.
Variation in β π with the radius of full-cell.
Scheme for detuning one cell to predict the variation of independent-cell frequency with its radius (a) for the full-cell and (b) for the half-cell.
Variation in half-cell frequency with its radius predicted by SUPERFISH and measured experimentally.
(a) Variation in f f and (b) variation in β f with the full-cell radius for L 1 = 15 mm.
Cross-section of full-cell showing thickness of RF coupling slot.
Brazing clearance between the full-cell and half-cell.
(a) Variation in f f and (b) variation in β f with brazing clearance predicted by SUPERFISH.
Comparison of measured values of different parameters of photocathode gun cells with those of SUPERFISH results.
Constants of different cells predicted by scaling law and from SUPERFISH simulations.
Comparison of experimental results with predictions.
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