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A novel scaling law relating the geometrical dimensions of a photocathode radio frequency gun to its radio frequency properties
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10.1063/1.3671289
/content/aip/journal/rsi/82/12/10.1063/1.3671289
http://aip.metastore.ingenta.com/content/aip/journal/rsi/82/12/10.1063/1.3671289

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the BNL/SLAC/UCLA type 1.6 cell photocathode RF gun.

Image of FIG. 2.
FIG. 2.

Variation in β π with length of RF coupling slot (L 1), for a constant radius of full- and half-cells.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

Variation in e b of π-mode with length of RF coupling slot (L 1).

Image of FIG. 5.
FIG. 5.

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.

Image of FIG. 6.
FIG. 6.

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.

Image of FIG. 7.
FIG. 7.

Variation in β π with the radius of full-cell.

Image of FIG. 8.
FIG. 8.

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.

Image of FIG. 9.
FIG. 9.

Variation in half-cell frequency with its radius predicted by SUPERFISH and measured experimentally.

Image of FIG. 10.
FIG. 10.

(a) Variation in f f and (b) variation in β f with the full-cell radius for L 1 = 15 mm.

Image of FIG. 11.
FIG. 11.

Cross-section of full-cell showing thickness of RF coupling slot.

Image of FIG. 12.
FIG. 12.

Brazing clearance between the full-cell and half-cell.

Image of FIG. 13.
FIG. 13.

(a) Variation in f f and (b) variation in β f with brazing clearance predicted by SUPERFISH.

Tables

Generic image for table
Table I.

Comparison of measured values of different parameters of photocathode gun cells with those of SUPERFISH results.

Generic image for table
Table II.

Constants of different cells predicted by scaling law and from SUPERFISH simulations.

Generic image for table
Table III.

Comparison of experimental results with predictions.

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/content/aip/journal/rsi/82/12/10.1063/1.3671289
2011-12-27
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A novel scaling law relating the geometrical dimensions of a photocathode radio frequency gun to its radio frequency properties
http://aip.metastore.ingenta.com/content/aip/journal/rsi/82/12/10.1063/1.3671289
10.1063/1.3671289
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