Author: Mihalcea, D.
Paper Title Page
TUPEA071 THz Bench Tests of a Slab-symmetric Dielectric Waveguide 1292
 
  • F. Lemery, H. Panuganti, P. Piot
    Northern Illinois University, DeKalb, Illinois, USA
  • D. Mihalcea, P. Piot
    Fermilab, Batavia, USA
  • P. Stoltz
    Tech-X, Boulder, Colorado, USA
 
  Funding: This work is supported by DTRA contract HDTRA1-10-1-0051 and by the U.S. DOE contracts DE-FG02-08ER41532 and DE-AC02-07CH11359.
Dielectric-lined waveguides (DLW) are becoming more popular for beam driven acceleration applications. An experiment to demonstrate beam-driven acceleration using a slab-symmetric dielectric-lined waveguide driven by a flat beam is in preparation at the Advanced Superconducting Test Accelerator (ASTA) at Fermilab. In this paper we characterize the structure using a THz pulse obtained from optical rectification using an amplified laser pulse. After propagation through the DLW structure, the THz pulse is analyzed using a Michelson interferometer and single-shot electro-optical imaging. Data for various gap size will be presented.
 
 
TUPEA072 Toward a Dielectric-Wakefield Energy Doubler at the Fermilab's Advanced Superconducting Test Accelerator 1295
 
  • F. Lemery, D. Mihalcea, P. Piot, C.R. Prokop
    Northern Illinois University, DeKalb, Illinois, USA
  • P. Piot, Y.-E. Sun
    Fermilab, Batavia, USA
  • P. Stoltz
    Tech-X, Boulder, Colorado, USA
 
  Funding: This work is supported by DTRA contract HDTRA1-10-1-0051 and by the U.S. DOE contracts DE-FG02-08ER41532 and DE-AC02-07CH11359.
The Advanced Superconducting Test Accelerator (ASTA), presently under construction at Fermilab, will produce high-charge (~<3 nC) electron bunches with energies ranging from 50 to eventually 750 MeV. The facility is based on a superconducting linac capable of producing up to 3000 bunches in 1-ms macropulses repeated at 5 Hz. In this paper we explore the use of a short dielectric-lined-waveguide (DLW) linac to significantly increase the bunch energy. The method consists in (1) using advanced phase space manipulation techniques to shape the beam distribution and enhance the transformer ratio, and (2) optimize the generation and acceleration of a low-charge witness bunches. Start-to-end simulations of the proposed concept are presented. This DLW module could also be used to test some aspects of a recently proposed concept for a multiuser short-wavelength free-electron laser utilizing a series of DLW linacs*.
* C. Jing et al., “A Compact Soft X-ray Free-Electron Laser Facility based on a Dielectric Wakefield Accelerator”, Advanced Photon Source LS Note LS-332, Argonne National Laboratory (2012).
 
 
TUPEA073 Performances of VORPAL-GPU Slab-symmetric DLW 1298
 
  • F. Lemery, K. Duffin, N. Karonis, D. Mihalcea, P. Piot, J. Winans
    Northern Illinois University, DeKalb, Illinois, USA
  • P.J. Mullowney, P. Stoltz
    Tech-X, Boulder, Colorado, USA
  • P. Piot
    Fermilab, Batavia, USA
 
  Funding: HDTRA1-10-1-0051, DOE(Grant No will be specified later)
GPU-based computing has gained popularity in recent years due to its growing software support and greater processing capabilities than its CPU counterpart.  GPU computing was recently added in the finite-difference time-domain program VORPAL. In this paper we carry electromagnetic simulations and optimization of a flat beam passing through a slab-symmetric dielectric-lined waveguide (DLW). We use this simulation model to explore the scaling of the GPU version of VORPAL on a new TOP1000-grade hybrid GPU/CPU computer cluster available at Northern Illinois University.
 
 
TUPWO060 Flat Electron Bunch Compression at the Advanced Superconducting Test Accelerator 2003
 
  • C.R. Prokop, D. Mihalcea, P. Piot
    Northern Illinois University, DeKalb, Illinois, USA
  • B.E. Carlsten
    LANL, Los Alamos, New Mexico, USA
  • P. Piot, Y.-E. Sun
    Fermilab, Batavia, USA
 
  Funding: This work is supported by LANL LDRD #20110067DR and by the U.S. DOE contracts DE-FG02-08ER41532 and DE-AC02-07CH11359.
The generation of flat beam using round-to-flat beam conversion of an incoming canonical-angular-momentum dominated electron beam could have important application in the field of advanced acceleration techniques and accelerator-based light source. In this paper we explore the temporal compression of flat beams and especially compare the resulting phase space dilutions with the case of round beam. Finally, we propose and detail a possible experiment to investigate the flat-beam bunch compression at the Advanced Superconducting Test Accelerator currently in construction at Fermilab.