LCLS Injector Laser Shaping and Applications

Li, Siqi; Alverson, Shawn; Bohler, Dorian; Egger, Adam; Fry, Alan; Gilevich, Sasha; Huang, Zhirong; Miahnahri, Alan; Ratner, Daniel; Robinson, Joseph; Zhou, Feng

doi:10.18429/JACoW-IPAC2017-WEPAB116

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RIS citation export for WEPAB116: LCLS Injector Laser Shaping and Applications

TY - CONF
AU - Li, S.
AU - Alverson, S.C.
AU - Bohler, D.K.
AU - Egger, A.B.
AU - Fry, A.R.
AU - Gilevich, S.
AU - Huang, Z.
AU - Miahnahri, A.
AU - Ratner, D.F.
AU - Robinson, J.
AU - Zhou, F.
ED - Schaa, Volker RW
ED - Arduini, Gianluigi
ED - Pranke, Juliana
ED - Seidel, Mike
ED - Lindroos, Mats
TI - LCLS Injector Laser Shaping and Applications
J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017
C1 - Copenhagen, Denmark
T2 - International Particle Accelerator Conference
T3 - 8
LA - english
AB - In the Linear Coherent Light Source (LCLS) at SLAC, the injector laser plays an important role as the source of the electron beam for the Free Electron Laser (FEL). The beam emittance and FEL performance are highly related to the transverse shape of the injector laser. When the injector laser has hot spots and non-uniformities that can carry over to the electron beam and degrade electron emittance and FEL performance, it requires long hours of manual adjustment by laser engineers and strenuous machine tuneup. The injector laser shaping project at LCLS aims to have precise control of the driver laser transverse profile in order to produce arbitrary electron beam profiles, which will enable us to study effects of laser shape on beam emittance and FEL performances. We use a digital micromirror device (DMD) to manipulate the drive laser profile. In this paper, we briefly discuss the implementations of laser shaping at LCLS. We demonstrate two applications of laser shaping. We present results of using laser shaping to control the X-ray laser output via an online optimizer. We also show the photocathode quantum efficiency measurements across cathode surface using the DMD.
PB - JACoW
CP - Geneva, Switzerland
SP - 2844
EP - 2847
KW - laser
KW - electron
KW - FEL
KW - cathode
KW - emittance
DA - 2017/05
PY - 2017
SN - 978-3-95450-182-3
DO - 10.18429/JACoW-IPAC2017-WEPAB116
UR - http://jacow.org/ipac2017/papers/wepab116.pdf
ER -