Demonstration of low emittance in the Cornell energy recovery linac injector prototype

被引：77

作者：

Gulliford, Colwyn ^{[1
]}

Bartnik, Adam ^{[1
]}

Bazarov, Ivan ^{[1
]}

Cultrera, Luca ^{[1
]}

Dobbins, John ^{[1
]}

Dunham, Bruce ^{[1
]}

Gonzalez, Francisco ^{[1
]}

Karkare, Siddharth ^{[1
]}

Lee, Hyeri ^{[1
]}

Li, Heng ^{[1
]}

Li, Yulin ^{[1
]}

Liu, Xianghong ^{[1
]}

Maxson, Jared ^{[1
]}

Christian Nguyen ^{[1
]}

Smolenski, Karl ^{[1
]}

Zhao, Zhi ^{[1
]}

机构：

[1] Cornell Univ, Cornell Lab Accelerator Based Sci & Educ CLASSE, Ithaca, NY 14853 USA

来源：

PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS | 2013年 / 16卷 / 07期

基金：

美国国家科学基金会;

关键词：

RF; ACCELERATOR; DESIGN; LASER; GUNS;

D O I：

10.1103/PhysRevSTAB.16.073401

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We present a detailed study of the six-dimensional phase space of the electron beam produced by the Cornell Energy Recovery Linac Photoinjector, a high-brightness, high repetition rate (1.3 GHz) DC photoemission source designed to drive a hard x-ray energy recovery linac (ERL). A complete simulation model of the injector has been constructed, verified by measurement, and optimized. Both the horizontal and vertical 2D transverse phase spaces, as well as the time-resolved (sliced) horizontal phase space, were simulated and directly measured at the end of the injector for 19 and 77 pC bunches at roughly 8 MeV. These bunch charges were chosen because they correspond to 25 and 100 mA average current if operating at the full 1.3 GHz repetition rate. The resulting 90% normalized transverse emittances for 19 (77) pC/bunch were 0.23 +/- 0.02 (0.51 +/- 0.04) mu m in the horizontal plane, and 0.14 +/- 0.01 (0.29 +/- 0.02) mu m in the vertical plane, respectively. These emittances were measured with a corresponding bunch length of 2.1 +/- 0.1 (3.0 +/- 0.2) ps, respectively. In each case the rms momentum spread was determined to be on the order of 10(-3). Excellent overall agreement between measurement and simulation has been demonstrated. Using the emittances and bunch length measured at 19 pC/bunch, we estimate the electron beam quality in a 1.3 GHz, 5 GeV hard x-ray ERL to be at least a factor of 20 times better than that of existing storage rings when the rms energy spread of each device is considered. These results represent a milestone for the field of high-brightness, high-current photoinjectors.

引用

页数：22

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