Time Resolved StudiesAcademic Staff: A. Prof. Peter Hammond *

Ph.D. Student: Aaron Alderman (thesis submitted Sept 11)

Postdoctoral Researcher: Dr Penny Thorn

Windsor, Canada: Electron/ion low energy storage ring (operating

1st prototype)

Apparatus & Collaborations

UWA Time Resolved Emission Detector for photoelectrons

Electron/ion low energy storage ring (soon to be operating 2nd

prototype)

Trieste, Italy:

Present: Elettra Synchrotron Light Source (operating ~ A$300 million)

In the future: FERMI Free Electron Laser (commissioning ~ A$110 million) * peter.hammond@uwa.edu.au

Current Personnel

Trieste, Italy: Elettra Synchrotron Light Source (operating) FERMI Free Electron Laser (commisioning)

The Synchrotron: photon pulses from stored electrons

Schematic representation Electrons accelerated in magnetic field devices to emit synchrotron radiation

Typical pulse separation is 2 ns (i.e. 500 MHz)

From experiments in June 2008 at Sincrotrone Trieste, Italy with 3rd prototype:

Time Resolved Emission Detector (TRED)

• A new technique invented at UWA• Built in the School of Physics workshop • Ultra-fast timing on picosecond timescale • Precision ~10 picoseconds• Usable for low energy electrons (>1eV) Nov 2011: 5th prototype at Sincrotrone Trieste

Electron signal from synchrotron light pulses separated by 2 ns

Aim: to measure picosecond scale atomic and molecular processes

Stored low energy electrons or ions - Recycling Spectrometer (RS)

Hemisphereentranceapertures

Interaction region

apertures

Hemisphereentranceapertures

r, θ for trajectory

in interaction

regions

mm

mm

mm

• Pulsed electron/ion injection

• Electron orbit: time ~300 ns

length 0.64m• Stored for ~100 orbits

For ions: long path length time of flight mass spectrometer

Key publications

Electron Storage:

D.R. Tessier, Y. Niu, D. P. Seccombe, T. J. Reddish, A. J. Alderman, B. G. Birdsey, F. H. Read and P. Hammond A Passive Electrostatic Recycling Spectrometer of Desk-Top Size for Charged Particles of Low Kinetic EnergyPhysical Review Letters (2007) 99, 253201 ( http://prl.aps.org/abstract/PRL/v99/i25/e253201 )

P. Hammond, T.J. Reddish, A.J. Alderman, D.R. Tessier and F.H. ReadStability criteria for a passive electrostatic non-relativistic charged particle storage deviceNew Journal of Physics (2009): 11, 043033 ( http://www.iop.org/EJ/abstract/1367-2630/11/4/043033 )

Fast timing of photons:

JG Lambourne, F Penent, P Lablanquie, RI Hall, M Ahmad. M Zitnik, K Bucar, MK Odling-Smee, JR Harries, P Hammond, DK Waterhouse, S Stranges, R Richter, M Alagia, M Coreno and M FerianisExperimental Determination of the Lifetime for the 2p3d(1Po) Helium Doubly Excited StatePhysical Review Letters(2003) 90, 153004 ( http://prl.aps.org/abstract/PRL/v90/i15/e153004 )

JR Harries, JP Sullivan, S Obara, Y Azuma, JG Lambourne, F Penent, RI Hall, P Lablanquie, K Bucar, M Zitnik and P HammondPartial photoionisation of helium into the 2s 2S and 2p 2P ion states in the 3lnl’ doubly-excited states regionJ. Phys. B: At. Mol. Opt. Phys. (2005) 38, L153–L160 ( http://iopscience.iop.org/0953-4075/38/10/L04 )

Fast timing of electrons with TRED: IPR too secret to publish yet!

Opportunities?

In all areas of the research into the TRED and the RS:

Ultra-fast timing experimental measurements

Further apparatus design, development and exploration

Computational modeling of RS and TRED apparatus (trajectory integration in 3D)

Commissioning of UWA RS prototype

Combination of TRED concept with RS spectrometer to form an ultra-high resolving power time-of-flight mass spectrometer (~400000)

For further information contact me - peter.hammond@uwa.edu.au

Data analysis & interpretation of data from the RS prototypes