Characterization of laser-driven single and double electron bunches with a permanent magnet quadrupole triplet and pepper-pot mask

Grace Manahan, Enrico Brunetti, Constantin Aniculaesei, Maria Pia Anania, Silvia Cipiccia, Mohammad Islam, David William Grant, Anna Subiel, Richard Shanks, Riju Issac, Gregor H. Welsh, Mark Wiggins, Dino Jaroszynski

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Electron beams from laser-plasma wakefield accelerators have low transverse emittance, comparable to those from conventional radio frequency accelerators, which highlights their potential for applications, many of which will require the use of quadrupole magnets for optimal electron beam transport. We report on characterizing electron bunches where double bunches are observed under certain conditions. In particular, we present pepper-pot measurements of the transverse emittance of 120-200 MeV laser wakefield electron bunches after propagation through a triplet of permanent quadrupole magnets. It is shown that the normalized emittance at source can be as low as 1 π mm mrad (resolution limited), growing by about five times after propagation through the quadrupoles due to beam energy spread. The inherent energy-dependence of the magnets also enables detection of double electron bunches that could otherwise remain unresolved, providing insight into the self-injection of multiple bunches. The combination of quadrupoles and pepper-pot, in addition, acts as a diagnostic for the alignment of the magnetic triplet.

LanguageEnglish
Article number103006
Number of pages13
JournalNew Journal of Physics
Volume16
Issue number10
DOIs
Publication statusPublished - 7 Oct 2014

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peppers
permanent magnets
masks
quadrupoles
emittance
magnets
lasers
electrons
electron beams
plasma accelerators
propagation
laser plasmas
radio frequencies
accelerators
alignment
injection
energy

Keywords

  • wakefield accelerators
  • electron beams
  • pepper pot measurements
  • electron bunches

Cite this

Manahan, Grace ; Brunetti, Enrico ; Aniculaesei, Constantin ; Anania, Maria Pia ; Cipiccia, Silvia ; Islam, Mohammad ; Grant, David William ; Subiel, Anna ; Shanks, Richard ; Issac, Riju ; Welsh, Gregor H. ; Wiggins, Mark ; Jaroszynski, Dino. / Characterization of laser-driven single and double electron bunches with a permanent magnet quadrupole triplet and pepper-pot mask. In: New Journal of Physics. 2014 ; Vol. 16, No. 10.
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Characterization of laser-driven single and double electron bunches with a permanent magnet quadrupole triplet and pepper-pot mask. / Manahan, Grace; Brunetti, Enrico; Aniculaesei, Constantin; Anania, Maria Pia; Cipiccia, Silvia; Islam, Mohammad; Grant, David William; Subiel, Anna; Shanks, Richard; Issac, Riju; Welsh, Gregor H.; Wiggins, Mark; Jaroszynski, Dino.

In: New Journal of Physics, Vol. 16, No. 10, 103006, 07.10.2014.

Research output: Contribution to journalArticle

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AU - Manahan, Grace

AU - Brunetti, Enrico

AU - Aniculaesei, Constantin

AU - Anania, Maria Pia

AU - Cipiccia, Silvia

AU - Islam, Mohammad

AU - Grant, David William

AU - Subiel, Anna

AU - Shanks, Richard

AU - Issac, Riju

AU - Welsh, Gregor H.

AU - Wiggins, Mark

AU - Jaroszynski, Dino

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N2 - Electron beams from laser-plasma wakefield accelerators have low transverse emittance, comparable to those from conventional radio frequency accelerators, which highlights their potential for applications, many of which will require the use of quadrupole magnets for optimal electron beam transport. We report on characterizing electron bunches where double bunches are observed under certain conditions. In particular, we present pepper-pot measurements of the transverse emittance of 120-200 MeV laser wakefield electron bunches after propagation through a triplet of permanent quadrupole magnets. It is shown that the normalized emittance at source can be as low as 1 π mm mrad (resolution limited), growing by about five times after propagation through the quadrupoles due to beam energy spread. The inherent energy-dependence of the magnets also enables detection of double electron bunches that could otherwise remain unresolved, providing insight into the self-injection of multiple bunches. The combination of quadrupoles and pepper-pot, in addition, acts as a diagnostic for the alignment of the magnetic triplet.

AB - Electron beams from laser-plasma wakefield accelerators have low transverse emittance, comparable to those from conventional radio frequency accelerators, which highlights their potential for applications, many of which will require the use of quadrupole magnets for optimal electron beam transport. We report on characterizing electron bunches where double bunches are observed under certain conditions. In particular, we present pepper-pot measurements of the transverse emittance of 120-200 MeV laser wakefield electron bunches after propagation through a triplet of permanent quadrupole magnets. It is shown that the normalized emittance at source can be as low as 1 π mm mrad (resolution limited), growing by about five times after propagation through the quadrupoles due to beam energy spread. The inherent energy-dependence of the magnets also enables detection of double electron bunches that could otherwise remain unresolved, providing insight into the self-injection of multiple bunches. The combination of quadrupoles and pepper-pot, in addition, acts as a diagnostic for the alignment of the magnetic triplet.

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