FLS2023 - List of Authors (Nguyen, D.C.)

Paper	Title	Page
TH1D3	SCU Development at the LCLS for Future FELs
	P. Krejcik, G.J. Bouchard, G.L. Gassner, Z. Huang, E.M. Kraft, B. Lam, M.A. Montironi, C.D. Nantista, D.C. Nguyen, H.-D. Nuhn, Z.R. Wolf, Z. Zhang SLAC, Menlo Park, California, USA J.M. Byrd, J.D. Fuerst, E. Gluskin, Y. Ivanyushenkov, M. Kasa, M.F. Qian, Y. Shiroyanagi ANL, Lemont, Illinois, USA X. Permanyer ESS, Lund, Sweden
	A joint SLAC/ANL development program is underway at the LCLS to demonstrate the advantages of SCUs for FEL beamlines. SCUs offer significant advantages for future FEL beam lines in gain length, wavelength reach, and tunability. The program leverages the storage ring SCUs developed at ANL and addresses the issues of integration in FELs and attaining the necessary micron precision for BBA. Our new modular cryomodule design is extendable to a full-length FEL and integrates the additional FEL components such as the phase shifter, quadrupole and RFBPM into the cold mass to achieve a high packing fraction and minimize the average gain length. Initially, 2 such cryomodules will be installed as afterburners at the end of the existing hard x-ray FEL beam line at the LCLS in order to measure the gain length and validate the beam based alignment procedure based on precision motion control of the cold mass internal to the cryomodule. We report on the status of the testing of these critical components on our precision alignment test stand, and discuss future plans for multiple FEL beamlines to be housed in a single cryomodule as part of the future LCLS expansion program for more user stations.
	Slides TH1D3 [2.384 MB]
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TU2A2	Single Longitudinal Mode Generation in Slippage-dominated, Tapered-undulator SASE Soft X-ray FEL	70
	D.C. Nguyen, M. Dunham, W. Lou, C.E. Mayes, G. Stupakov xLight, Palo Alto, USA
	SASE FELs operating in the soft X-ray region exhibit multiple temporal and spectral spikes with an overall spectral bandwidth of about 1.5 times the FEL rho parameter. While many ideas have been proposed to achieve fully coherent X-ray FELs, only monochromatic seeding, either harmonic seeding* or SASE self-seeding*, has been experimentally demonstrated to narrow the output spectra of soft X-ray FELs. In this paper, we study a different method that relies on the Slippage-dominated Tapered Undulator (STU) SASE concept to produce a single longitudinal mode in a soft X-ray FEL driven by ~10-fs, 16-pC electron bunches. We pre-sent numerical simulation results that demonstrate single-mode generation and narrow-lined spectra without seeding in a STU-SASE FEL at 6.67 nm. E. Alaria et al., Nat Photon 7 (2013) 913-918 ** D. Ratner et al., PRL 114 (2015) 050801
	Slides TU2A2 [1.125 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU2A2
About •	Received ※ 22 August 2023 — Revised ※ 23 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

TH1D3

SCU Development at the LCLS for Future FELs

P. Krejcik, G.J. Bouchard, G.L. Gassner, Z. Huang, E.M. Kraft, B. Lam, M.A. Montironi, C.D. Nantista, D.C. Nguyen, H.-D. Nuhn, Z.R. Wolf, Z. Zhang
SLAC, Menlo Park, California, USA
J.M. Byrd, J.D. Fuerst, E. Gluskin, Y. Ivanyushenkov, M. Kasa, M.F. Qian, Y. Shiroyanagi
ANL, Lemont, Illinois, USA
X. Permanyer
ESS, Lund, Sweden

A joint SLAC/ANL development program is underway at the LCLS to demonstrate the advantages of SCUs for FEL beamlines. SCUs offer significant advantages for future FEL beam lines in gain length, wavelength reach, and tunability. The program leverages the storage ring SCUs developed at ANL and addresses the issues of integration in FELs and attaining the necessary micron precision for BBA. Our new modular cryomodule design is extendable to a full-length FEL and integrates the additional FEL components such as the phase shifter, quadrupole and RFBPM into the cold mass to achieve a high packing fraction and minimize the average gain length. Initially, 2 such cryomodules will be installed as afterburners at the end of the existing hard x-ray FEL beam line at the LCLS in order to measure the gain length and validate the beam based alignment procedure based on precision motion control of the cold mass internal to the cryomodule. We report on the status of the testing of these critical components on our precision alignment test stand, and discuss future plans for multiple FEL beamlines to be housed in a single cryomodule as part of the future LCLS expansion program for more user stations.

Slides TH1D3 [2.384 MB]

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TU2A2

Single Longitudinal Mode Generation in Slippage-dominated, Tapered-undulator SASE Soft X-ray FEL

70

D.C. Nguyen, M. Dunham, W. Lou, C.E. Mayes, G. Stupakov
xLight, Palo Alto, USA

SASE FELs operating in the soft X-ray region exhibit multiple temporal and spectral spikes with an overall spectral bandwidth of about 1.5 times the FEL rho parameter. While many ideas have been proposed to achieve fully coherent X-ray FELs, only monochromatic seeding, either harmonic seeding* or SASE self-seeding**, has been experimentally demonstrated to narrow the output spectra of soft X-ray FELs. In this paper, we study a different method that relies on the Slippage-dominated Tapered Undulator (STU) SASE concept to produce a single longitudinal mode in a soft X-ray FEL driven by ~10-fs, 16-pC electron bunches. We pre-sent numerical simulation results that demonstrate single-mode generation and narrow-lined spectra without seeding in a STU-SASE FEL at 6.67 nm.
* E. Alaria et al., Nat Photon 7 (2013) 913-918
** D. Ratner et al., PRL 114 (2015) 050801

Slides TU2A2 [1.125 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU2A2

About •

Received ※ 22 August 2023 — Revised ※ 23 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)