Experimentally minimized beam emittance from an L-band photoinjector

被引：70

作者：

Krasilnikov, M. ^{[1
]}

Stephan, F. ^{[1
]}

Asova, G. ^{[1
]}

Grabosch, H. -J. ^{[1
]}

Gross, M. ^{[1
]}

Hakobyan, L. ^{[1
]}

Isaev, I. ^{[1
]}

Ivanisenko, Y. ^{[1
]}

Jachmann, L. ^{[1
]}

Khojoyan, M. ^{[1
]}

Klemz, G. ^{[1
]}

Koehler, W. ^{[1
]}

Mahgoub, M. ^{[1
]}

Malyutin, D. ^{[1
]}

Nozdrin, M. ^{[1
]}

Oppelt, A. ^{[1
]}

Otevrel, M. ^{[1
]}

Petrosyan, B. ^{[1
]}

Rimjaem, S. ^{[1
]}

Shapovalov, A. ^{[1
]}

Vashchenko, G. ^{[1
]}

Weidinger, S. ^{[1
]}

Wenndorff, R. ^{[1
]}

Floettmann, K. ^{[2
]}

Hoffmann, M. ^{[2
]}

Lederer, S. ^{[2
]}

Schlarb, H. ^{[2
]}

Schreiber, S. ^{[2
]}

Templin, I. ^{[3
]}

Will, I. ^{[3
]}

Paramonov, V. ^{[4
]}

Richter, D. ^{[5
]}

机构：

[1] Deutsch Elektronen Synchrotron DESY, D-15738 Zeuthen, Germany

[2] Deutsch Elektronen Synchrotron DESY, D-22607 Hamburg, Germany

[3] Max Born Inst, D-12489 Berlin, Germany

[4] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

[5] Helmholtz Zentrum Berlin, D-14109 Berlin, Germany

来源：

PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS | 2012年 / 15卷 / 10期

关键词：

LASER;

D O I：

10.1103/PhysRevSTAB.15.100701

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：

High brightness electron sources for linac based free-electron lasers (FELs) are being developed at the Photo Injector Test facility at DESY, Zeuthen site (PITZ). Production of electron bunches with extremely small transverse emittance is the focus of the PITZ scientific program. The photoinjector optimization in 2008-2009 for a bunch charge of 1, 0.5, 0.25, and 0.1 nC resulted in measured emittance values which are beyond the requirements of the European XFEL [S. Rimjaem et al., Nucl. Instrum. Methods Phys. Res., Sect. A 671, 62 (2012)]. Several essential modifications were commissioned in 2010-2011 at PITZ, resulting in further improvement of the photoinjector performance. Significant improvement of the rf gun phase stability is a major contribution in the reduction of the measured transverse emittance. The old TESLA prototype booster was replaced by a new cut disk structure cavity. This allows acceleration of the electron beam to higher energies and supports much higher flexibility for stable booster operation as well as for longer rf pulses which is of vital importance especially for the emittance optimization of low charge bunches. The transverse phase space of the electron beam was optimized at PITZ for bunch charges in the range between 0.02 and 2 nC, where the quality of the beam measurements was preserved by utilizing long pulse train operation. The experimental optimization yielded worldwide unprecedented low normalized emittance beams in the whole charge range studied.

引用

页数：18

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