High brightness electron beam emittance evolution measurements in an rf photoinjector

被引：36

作者：

Cianchi, A. ^{[1
]}

Alesini, D. ^{[2
]}

Bacci, A. ^{[3
]}

Bellaveglia, M. ^{[2
]}

Boni, R. ^{[2
]}

Boscolo, M. ^{[2
]}

Castellano, M. ^{[2
]}

Catani, L. ^{[1
]}

Chiadroni, E. ^{[2
]}

Cialdi, S.

Clozza, A. ^{[2
]}

Cultrera, L. ^{[2
]}

Di Pirro, G. ^{[2
]}

Drago, A. ^{[2
]}

Esposito, A. ^{[2
]}

Ferrario, M. ^{[2
]}

Ficcadenti, L. ^{[4
]}

Filippetto, D. ^{[2
]}

Fusco, V. ^{[2
]}

Gallo, A. ^{[2
]}

Gatti, G. ^{[2
]}

Ghigo, A. ^{[2
]}

Giannessi, L. ^{[5
]}

Ligi, C. ^{[2
]}

Mattioli, M. ^{[6
]}

Migliorati, M. ^{[2
,4
]}

Mostacci, A. ^{[2
,4
]}

Musumeci, P. ^{[7
]}

Pace, E. ^{[2
]}

Palumbo, L. ^{[2
,4
]}

Pellegrino, L. ^{[2
]}

Petrarca, M. ^{[8
]}

Preger, M. ^{[2
]}

Quattromini, M. ^{[5
]}

Ricci, R. ^{[2
]}

Ronsivalle, C. ^{[5
]}

Rosenzweig, J. ^{[7
]}

Rossi, A. R.

Sanelli, C. ^{[2
]}

Serafini, L. ^{[3
]}

Serio, M. ^{[2
]}

Sgamma, F. ^{[2
]}

Spataro, B. ^{[2
]}

Tazzioli, F. ^{[2
]}

Tomassini, S. ^{[2
]}

Vaccarezza, C. ^{[2
]}

Vescovi, M. ^{[2
]}

Vicario, C. ^{[2
]}

机构：

[1] Ist Nazl Fis Nucl, I-00133 Rome, Italy

[2] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[3] Ist Nazl Fis Nucl, I-20133 Milan, Italy

[4] Univ Roma La Sapienza, Dipartimento Energet, I-00161 Rome, Italy

[5] ENEA, I-00044 Frascati, Italy

[6] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[7] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[8] Ist Nazl Fis Nucl, I-00185 Rome, Italy

来源：

PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS | 2008年 / 11卷 / 03期

关键词：

D O I：

10.1103/PhysRevSTAB.11.032801

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：

The new generation of linac injectors driving free electron lasers in the self-amplified stimulated emission (SASE-FEL) regime requires high brightness electron beams to generate radiation in the wavelength range from UV to x rays. The choice of the injector working point and its matching to the linac structure are the key factors to meet this requirement. An emittance compensation scheme presently applied in several photoinjectors worldwide is known as the "Ferrario'' working point. In spite of its great importance there was, so far, no direct measurement of the beam parameters, such as emittance, transverse envelope, and energy spread, in the region downstream the rf gun and the solenoid of a photoinjector to validate the effectiveness of this approach. In order to fully characterize the beam dynamics with this scheme, an innovative beam diagnostic device, the emittance meter, consisting of a movable emittance measurement system, has been designed and built. With the emittance meter, measurements of the main beam parameters in both transverse phase spaces can be performed in a wide range of positions downstream the photoinjector. These measurements help in tuning the injector to optimize the working point and provide an important benchmark for the validation of simulation codes. We report the results of these measurements in the SPARC photoinjector and, in particular, the first experimental evidence of the double minimum in the emittance oscillation, which provides the optimized matching to the SPARC linac.

引用

页数：13

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