2024
A view of lake Zurich toward the alps, taken during PSAS 2024.
A view of Zurich, taken during PSAS 2024.
Rebecca presenting her talk at PSAS 2024.
Ross presenting his poster at PSAS 2024.
Sam presenting his poster at PSAS 2024.
A view of Zurich toward the alps, taken during PSAS 2024.
A river in Zurich, taken during PSAS 2024.
An MCP with a hole in.
The propagation of microwave radiation into our experiment.
The pulsed positron beam at UCL.
The new AC unit of the pulsed positron lab.
A dinner at the UK positron meeting 2024.
An infrared laser beam ionising the air after being focused by a lens.
Mind the stick! The 3D drawing was made in the 90s so at the time this sign was cutting edge.
A positron eye view looking down the centre of a positron accumulator.
The gold coated electrodes of a positron accumulator. The centre electrode is split into four segments to apply a rotating wall voltage to compress the positrons.
Another new layer of freshly wound round wire on the solenoid.
A freshly wound layer of square wire on a solenoid magnet.
An old defunct solenoid with a corroded and broken wire.
An old broken solenoid with a corroded wire.
Electrons causing the phosphor screen on a LEED (low energy electron diffraction) setup to glow.
Right: The barrel of an electron gun and retarding field analyser for an AES (Auger electron spectroscopy) setup. Left: A glowing heater stage cleaning some copper by causing contaminents to outgas into vacuum.
2023
The circuit that lowers the gate electrode of our buffer gas positron trap.
The visibly divergent beam of a green YAG laser.
The trap section of our new positron beam.
The 4K coldhead for our new positron beam with the source holder mounted at the top.
A close up of the Na-22 source holder. The divet is actually the bottom of the holder and contains a sapphire disk to electrically isolate but thermally couple the holder to the coldhead (which can be seen in the background).
Copper gaskets that we use to seal our ultra high vacuum system. The one on the top is new and the one at the bottom has been sealed by the steel vacuum chamber.
An ion gauge to measure UHV pressures (with one filament broken).
A heater state to heat silica positron to positronium conversion targets to clean them.
A range of LYSO scintillator detectors placed around our forbidden transition experimental setup.
Pumpkin!
The WR-75 microwave waveguide installed onto the positron beamline. The black coils generate a DC magnetic field to guide the positrons.
A WR-75 microwave waveguide designed to drive two fine structure transitions of the Ps n = 2 manifold. The antennas are connected to vacuum suitable SMA cables.
A WR-75 microwave waveguide designed to drive two fine structure transitions of the Ps n = 2 manifold. The positronium passes through the holes into the waveguide.
A WR-75 microwave waveguide designed to drive two fine structure transitions of the Ps n = 2 manifold.
The current state of our new positron beam for antimatter gravity interferometry studies.
A tiny boltsman which was a gift from the positron group at SMI in Vienna, Austria.
Our office plants.
A microwave horn antenna to drive the forbidden transition of the n = 2 Ps manifold
A microwave horn antenna to drive the forbidden transition of the n = 2 Ps manifold
The setup for measuring a forbidden transition of the Ps n=2 fine structure
Installation of a new mesoporous silica positron to Ps converter
Chateau de Chamerolles at the SLOPOS 16 conference banquet
Rebecca presenting her poster at SLOPOS 16
Sam presenting his poster at SLOPOS 16
Hotel Groslot, location of the SLOPOS 16 welcome reception
Orleans cathedral during SLOPOS 16
A glowing ion gauge for measuring vacuum pressures
A picture of the plasma discharge that generates the metastable helium beam.
The UCL pulsed positron beamline in July 2023
The UCL continuous positron beam
An Auger spectroscopy setup
Rounders in Regents Park for CATMIN III
Rounders in Regents Park for CATMIN III
Sam presenting his poster at CATMIN III
CATMIN III group photo in front of the UCL portico.
A 5 year old cryo pump
A >20 year old cryo pump
Old FORTRAN punch cards.
The wires of a delay line detector
A 40mm and 80mm delay line detector (DLD)
Homemade cooling jacket for a solenoid magnet
A view of the rapids in Spokane during the DAMOP 2023 conference
Rebecca presenting her poster at DAMOP 2023
An accurate sign during the DAMOP 2023 conference
The welcome reception at DAMOP 2023
Sam presenting his poster at DAMOP 2023
A gamma-ray detector
A photomultiplier tube for making a gamma-ray detector
A LYSO crystal array for making a gamma-ray detector
A thesis of the UCL positron group from 1970
40mm imaging MCP
High phase acceptance electrostatic ring guide
A curved quadrupole guide illuminated by the filament of a rare gas analyser.
2022
Sam Reeder presenting his poster at PSAS 2022
David presenting his talk at PSAS 2022
The PSAS 2022 group photo
Detection region after electrostatic quadrupole guide
Curve quadrupole guide for Rydberg Ps
Curve quadrupole guide for Rydberg Ps
Microwave waveguide in a cube vacuum chamber for precision measurements of Ps
A microwave waveguide for the Nu2 transition of the Ps n=2 fine structure
Electrodes for a measurement of the Ps 2P lifetime
2021
Free-space microwave horn antenna spectroscopy experiment
Supersonic helium beam
2020
A target chamber designed to study the annihilation lifetime of metastable 2S atoms.
Target chamber installed on the beamline.
A WR-112 microwave waveguide with the interior coated with smoked MgO powder.
An SEM image of smoked MgO crystals.
2019
Mark 5 waveguide CAD design
Waveguide installed inside chamber
Waveguide mounted on a 6″ flange
Microwave guide Mark 5
Microwave guide Mark 4
Microwave guide Mark 3
Microwave guide Mark 2
Microwave Spectroscopy Mark 1
Target chamber which houses the ring guide
Multiring guide
A multiring electrostatic guide designed to manipulate atoms using electric fields
2018
2016
2015
2014
2013
1999
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