Explanipedia

RECENT IMPROVEMENTS IN THE SLC POSITRON SYSTEM PERFORMANCE Open

P. Krejcik, Jeff Corbett, S. Ecklund, P. Emma, T. Fieguth , et al. · 2023

The positron system is very specific to the SLC in that the positrons are accelerated in the same linac as the electrons that produce them and the electrons with which they collide. Some of the difficulties in tuning this system to peak pe…

New X-Band RF Deflector for Femtosecond Diagnostics of LCLS-II Beams Open

Valery Dolgashev, Harmanpreet Bassan, Shantha Condamoor, Andrew Haase, P. Krejcik , et al. · 2021

An X-band transverse deflector has been successfully developed for femtosecond electron and x-ray pulse temporal diagnostic at the LCLS [1]. The working frequency for the deflector is 11.424 GHz. New free electron laser LCLS-II has two und…

Performance of the SLAC-PAL-Vitzrotech X-band Cavity BPMs in the LCLS-II Undulator Beam Lines Open

C. Nantista, Sonya Hoobler, Changbum Kim, P. Krejcik, D. Martínez-Galarce , et al. · 2021

The hard X-ray and soft X-Ray undulator beamlines of the LCLS-II X-ray FEL incorporate 65 X-band RF beam position monitors for accurate tracking of the electron beam trajectories and Beam-Based Alignment. For this crucial function, a desig…

Measurements of wake-induced electron beam deflection in a dechirper at the Linac Coherent Light Source Open

Johann Zemella, K. Bane, A. Fisher, Marc Guetg, Zhirong Huang , et al. · 2019

The RadiaBeam/SLAC dechirper, a structure consisting of pairs of flat, metallic, corrugated plates, has been installed just upstream of the undulators in the Linac Coherent Light Source (LCLS). As a dechirper, with the beam passing between…

A simple method for a very short X-ray pulse production and attosecond diagnostic at LCLS Open

Alexander Novokhatski, Dorian Bohler, A. Brachmann, William Colocho, Franz-Josef Decker , et al. · 2018

Development for a supercompact -band pulse compression system and its application at SLAC Open

Juwen W. Wang, Sami Tantawi, Chen Xu, Matt Franzi, P. Krejcik , et al. · 2017

Here, we have successfully designed, fabricated, installed, and tested a super compact X -band SLAC Energy Doubler system at SLAC. It is composed of an elegant 3 dB coupler–mode converter–polarizer coupled to a single spherical energy stor…

Sub-fs Resolution with the Enhanced Operation of the X-band Transverse Deflecting Cavity using an RF pulse Compression SLED Cavity Open

P. Krejcik, Gordon Bowden, Shantha Condamoor, Yuantao Ding, Valery Dolgashev , et al. · 2017

The successful operation of the x-band transverse deflecting cavity (XTCAV) installed downstream of the LCLS undulator has been further enhanced by the recent addition of an RF pulse compression "SLED" cavity that doubles the temporal reso…

R&D of a Super-compact SLED System at SLAC Open

Juwen Wang, Gordon Bowden, Shantha Condamoor, Yuantao Ding, Valery Dolgashev , et al. · 2016

We have successfully designed, fabricated, installed and tested a super-compact X-Band SLED system at SLAC. It is composed of an elegant mode converter/polarizer and a single sphere energy store cavity with high Q of 94000 and diameter les…

Performance of the New Fast Wire Scanner at the LCLS Open

P. Krejcik, Marc Campell, John D'Ewart, H. Loos, K. Luchini · 2016

A new fast wire scanner based on a linear DC servo motor acting through dual bellows has been developed at SLAC. After successful beam testing at LCLS we are now replacing all the old style stepping motor driven scanners with the new type.…

Commissioning of the RadiaBeam / SLAC Dechirper Open

Marc Guetg, K. Bane, A. Brachmann, Alan Fisher, M. Harrison , et al. · 2016

We present results on the commissioning of the two-module RadiaBeam / SLAC dechirper system at LCLS. This is the first installation and measurement of a corrugated dechirper at high energy (4.4 - 13.3 GeV), short pulses (< 200 fs) and whil…

RadiaBeam/SLAC Dechirper as a Passive Deflector Open

Alexander Novokhatski, A. Brachmann, Massimo Dal Forno, Valery Dolgashev, A. Fisher , et al. · 2016

We discuss the possibility of using the RadiBeam/SLAC dechirper recently installed at LCLS for measuring the bunch length of very short bunches, less than 1 fs perhaps as short as 100 atto second. When a bunch travels close to one of the j…

Transverse Profiling of an Intense FEL X-Ray Beam Using a Probe Electron Beam Open

P. Krejcik · 2016

Monitoring the pulse by pulse output intensity and profile of an FEL is a critical measurement both for users and for optimising the accelerator drive beam. The diagnostic challenge is to find a technique that is not susceptible to damage …

Implementation of a Corrugated-Plate Dechirping System for GeV Electron Beam at LCLS Open

M. Harrison, Alisha Babbitt, Manuel Carrasco, Antonio Cedillos, P. Frigola , et al. · 2016

A new corrugated-plate Dechirper was recently installed in the LCLS and underwent commissioning tests to gauge its efficacy in shaping the longitudinal phase space of bunches entering the FEL. Here, we describe in detail the completed four…

Generating femtosecond X-ray pulses using an emittance-spoiling foil in free-electron lasers Open

Yuantao Ding, C. Behrens, Ryan Coffee, F.-J. Decker, P. Emma , et al. · 2015

Generation of femtosecond to sub-femtosecond pulses is attracting much attention in X-ray free-electron laser user community. One method is to use a slotted, emittance-spoiling foil which was proposed before (P. Emma et al., Phys. Rev. Let…

LLRF AND HPRF CONTROLS UPGRADE FOR THE LCLS XTCAV PROJECT AT SLAC NATIONAL ACCELERATOR LAB Open

Shantha Condamoor, Yuantao Ding, P. Krejcik, H. Loos, T. J. Maxwell , et al. · 2015

Results from the LCLS X-Band Transverse Deflector with Femtosecond Temporal Resolution Open

Yuantao Ding, Timothy Maxwell, H. Loos, Agostino Marinelli, Zhirong Huang , et al. · 2015

An X-band RF transverse deflector composed of two 1-m-long X-band deflecting structures has been recently commissioned at the Linac Coherent Light Source (LCLS) at SLAC National Accelerator Laboratory. Located downstream of the FEL undulat…

Flexible control of femtosecond pulse duration and separation using an emittance-spoiling foil in x-ray free-electron lasers Open

Yingying Ding, C. Behrens, R. Coffee, F.‐J. Decker, P. Emma , et al. · 2015

We report experimental studies of generating and controlling femtosecond x-ray pulses in free-electron lasers (FELs) using an emittance spoiling foil. By selectivity spoiling the transverse emittance of the electron beam, the output pulse …

Fast Wire Scanner Upgrade for LCLS Open

John D'Ewart, Marc Campell, P. Krejcik, H. Loos, K. Luchini · 2015

Wire scanners are a main diagnostic tool for transverse beam size and emittance measurements at LCLS. The original SLAC wire scanners were not optimized for speed (taking minutes to scan), and can't perform at the desired level of position…

LLRF Controls Upgrade for the LCLS XTCAV project at SLAC Open

Shantha Condamoor, Yuantao Ding, P. Krejcik, H. Loos, Timothy Maxwell , et al. · 2015

SLAC's Low Level Radio Frequency (LLRF) controls software for the S-Band deflecting structures needed to be upgraded significantly when a new X-Band transverse deflecting cavity (XTCAV) was installed downstream of the LCLS undulators in Sp…

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