2011 Particle Accelerator Conference - List of Authors (Nguyen, D.C.)

Paper

Title

Page

MaRIE X-Ray Free-Electron Laser Pre-Conceptual Design

799

B.E. Carlsten, C.W. Barnes, K. Bishofberger, L.D. Duffy, C.E. Heath, Q.R. Marksteiner, D.C. Nguyen, S.J. Russell, R.L. Sheffield, E.I. Simakov, N.A. Yampolsky
LANL, Los Alamos, New Mexico, USA
R.D. Ryne
LBNL, Berkeley, California, USA

Funding: This work is supported by the U.S. Department of Energy through the LANL/LDRD and MaRIE programs.
The proposed Matter-Radiation Interactions in Extremes (MaRIE) facility at the Los Alamos National Laboratory will include a 50-keV X-Ray Free-Electron Laser (XFEL), a significant extension from planned and existing XFEL facilities. To prevent an unacceptably large energy spread arising from energy diffusion, the electron beam energy should not exceed 20 GeV, which puts a significant constraint on the beam emittance. To achieve a sufficiently high gradient of 50 MV/m, an rf frequency of 11.424 GHz is considered. A 100-pC baseline design is presented along with advanced technology options to increase the photon flux and to generate longitudinal coherency through single-bunch optical seeding, pre-bunching the electron beam, and combinations of these techniques.

Slides TUODS1 [0.751 MB]

THP202

First Operation of the LANL/AES Normal Conducting Radio Frequency Photoinjector

2498

N.A. Moody, H.L. Andrews, G.O. Bolme, L.J. Castellano, C.E. Heath, F.L. Krawczyk, S. Kwon, D. C. Lizon, P.S. Marroquin, F.A. Martinez, D.C. Nguyen, M.S. Prokop, R.M. Renneke, W. Roybal, P.A. Torrez, W.M. Tuzel, T. Zaugg
LANL, Los Alamos, New Mexico, USA
L. Roybal
TechSource, Santa Fe, New Mexico, USA

Funding: We gratefully acknowledge funding from the Office of Naval Research (ONR) and the High Energy Laser Joint Technology Office (HEL-JTO).
The LANL/AES normal-conducting radio-frequency (NCRF) injector has undergone high power testing, confirming field gradients of up to 10 MV/m at the cathode. Most NCRF designs are limited to low-duty-factor operation to constrain rf power consumption and limit ohmic heat generation. This cavity structure utilizes high density micro-channel cooling to successfully remove heat with the option of dynamic temperature control to actively adjust cavity resonance. This first high power rf test demonstrated stable cw (100% duty cycle) operation using resonant frequency tracking and produced intentional dark current emission from a roughened cathode blank. Resulting end-point x-ray measurements confirm the cathode gradient of 9.8 ± 0.2 MV/m required for acceleration of nC bunches to a beam energy of 2.5 MeV.

Paper	Title	Page
TUODS1	MaRIE X-Ray Free-Electron Laser Pre-Conceptual Design	799
	B.E. Carlsten, C.W. Barnes, K. Bishofberger, L.D. Duffy, C.E. Heath, Q.R. Marksteiner, D.C. Nguyen, S.J. Russell, R.L. Sheffield, E.I. Simakov, N.A. Yampolsky LANL, Los Alamos, New Mexico, USA R.D. Ryne LBNL, Berkeley, California, USA
	Funding: This work is supported by the U.S. Department of Energy through the LANL/LDRD and MaRIE programs. The proposed Matter-Radiation Interactions in Extremes (MaRIE) facility at the Los Alamos National Laboratory will include a 50-keV X-Ray Free-Electron Laser (XFEL), a significant extension from planned and existing XFEL facilities. To prevent an unacceptably large energy spread arising from energy diffusion, the electron beam energy should not exceed 20 GeV, which puts a significant constraint on the beam emittance. To achieve a sufficiently high gradient of 50 MV/m, an rf frequency of 11.424 GHz is considered. A 100-pC baseline design is presented along with advanced technology options to increase the photon flux and to generate longitudinal coherency through single-bunch optical seeding, pre-bunching the electron beam, and combinations of these techniques.
	Slides TUODS1 [0.751 MB]

THP202	First Operation of the LANL/AES Normal Conducting Radio Frequency Photoinjector	2498
	N.A. Moody, H.L. Andrews, G.O. Bolme, L.J. Castellano, C.E. Heath, F.L. Krawczyk, S. Kwon, D. C. Lizon, P.S. Marroquin, F.A. Martinez, D.C. Nguyen, M.S. Prokop, R.M. Renneke, W. Roybal, P.A. Torrez, W.M. Tuzel, T. Zaugg LANL, Los Alamos, New Mexico, USA L. Roybal TechSource, Santa Fe, New Mexico, USA
	Funding: We gratefully acknowledge funding from the Office of Naval Research (ONR) and the High Energy Laser Joint Technology Office (HEL-JTO). The LANL/AES normal-conducting radio-frequency (NCRF) injector has undergone high power testing, confirming field gradients of up to 10 MV/m at the cathode. Most NCRF designs are limited to low-duty-factor operation to constrain rf power consumption and limit ohmic heat generation. This cavity structure utilizes high density micro-channel cooling to successfully remove heat with the option of dynamic temperature control to actively adjust cavity resonance. This first high power rf test demonstrated stable cw (100% duty cycle) operation using resonant frequency tracking and produced intentional dark current emission from a roughened cathode blank. Resulting end-point x-ray measurements confirm the cathode gradient of 9.8 ± 0.2 MV/m required for acceleration of nC bunches to a beam energy of 2.5 MeV.