Laser heater commissioning at an externally seeded free-electron laser

被引：52

作者：

Spampinati, S. ^{[1
,2
]}

Allaria, E. ^{[1
]}

Badano, L. ^{[1
]}

Bassanese, S. ^{[1
]}

Biedron, S. ^{[1
]}

Castronovo, D. ^{[1
]}

Craievich, P. ^{[1
]}

Danailov, M. B. ^{[1
]}

Demidovich, A. ^{[1
]}

De Ninno, G. ^{[1
,2
]}

Di Mitri, S. ^{[1
]}

Diviacco, B. ^{[1
]}

Dal Forno, M. ^{[1
,3
]}

Ferrari, E. ^{[1
,3
]}

Fawley, W. M. ^{[1
]}

Froehlich, L. ^{[1
]}

Gaio, G. ^{[1
]}

Giannessi, L. ^{[1
,4
]}

Penco, G. ^{[1
]}

Serpico, C. ^{[1
]}

Spezzani, C. ^{[1
]}

Trovo, M. ^{[1
]}

Veronese, M. ^{[1
]}

Milton, S. V. ^{[1
]}

Svandrlik, M. ^{[1
]}

机构：

[1] Elettra Sincrotrone Trieste, I-34149 Basovizza, TS, Italy

[2] Nova Gorica Univ, Opt Quant Lab, SI-5000 Rozna Dolina, Nova Gorica, Slovenia

[3] Univ Trieste, I-34128 Trieste, Italy

[4] Theory Grp ENEA CR Frascati, I-00044 Rome, Italy

来源：

PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS | 2014年 / 17卷 / 12期

关键词：

TESLA TEST FACILITY; INSTABILITY;

D O I：

10.1103/PhysRevSTAB.17.120705

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：

FERMI is the first user facility based upon an externally seeded free-electron laser (FEL) and was designed to deliver high quality, transversely and longitudinally coherent radiation pulses in the extreme ultraviolet and soft x-ray spectral regimes. The FERMI linear accelerator includes a laser heater to control the longitudinal microbunching instability, which otherwise is expected to degrade the quality of the high brightness electron beam sufficiently to reduce the FEL output intensity and spectral brightness. In this paper, we present the results of the FERMI laser heater commissioning. For the first time, we show that optimizing the electron beam heating at an upstream location (beam energy, 100 MeV) leads to a reduction of the incoherent energy spread at the linac exit (beam energy, 1.2 GeV). We also discuss some of the positive effects of such heating upon the emission of coherent optical transition radiation and the FEL output intensity.

引用

页数：10

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