Imperial College London

DrJackDevlin

Faculty of Natural SciencesDepartment of Physics

Royal Society University Research Fellow
 
 
 
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Contact

 

j.devlin11

 
 
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Location

 

6m05Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
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25 results found

Wiesinger M, Stuhlmann F, Bohman M, Micke P, Will C, Yildiz H, Abbass F, Arndt BP, Devlin JA, Erlewein S, Fleck M, Jäger JI, Latacz BM, Schweitzer D, Umbrazunas G, Wursten E, Blaum K, Matsuda Y, Mooser A, Quint W, Soter A, Walz J, Smorra C, Ulmer Set al., 2023, Trap-integrated fluorescence detection with silicon photomultipliers for sympathetic laser cooling in a cryogenic Penning trap., Rev Sci Instrum, Vol: 94

We present a fluorescence-detection system for laser-cooled 9Be+ ions based on silicon photomultipliers (SiPMs) operated at 4 K and integrated into our cryogenic 1.9 T multi-Penning-trap system. Our approach enables fluorescence detection in a hermetically sealed cryogenic Penning-trap chamber with limited optical access, where state-of-the-art detection using a telescope and photomultipliers at room temperature would be extremely difficult. We characterize the properties of the SiPM in a cryocooler at 4 K, where we measure a dark count rate below 1 s-1 and a detection efficiency of 2.5(3)%. We further discuss the design of our cryogenic fluorescence-detection trap and analyze the performance of our detection system by fluorescence spectroscopy of 9Be+ ion clouds during several runs of our sympathetic laser-cooling experiment.

Journal article

Ahyoune S, Álvarez Melcón A, Arguedas Cuendis S, Calatroni S, Cogollos C, Devlin J, DíazMorcillo A, DíezIbáñez D, Döbrich B, Galindo J, Gallego JD, GarcíaBarceló JM, Gimeno B, Golm J, Gu Y, Herwig L, Garcia Irastorza I, LozanoGuerrero AJ, Malbrunot C, MiraldaEscudé J, MonzóCabrera J, Navarro P, NavarroMadrid JR, Redondo J, ReinaValero J, Schmieden K, Schneemann T, Siodlaczek M, Ulmer S, Wuensch Wet al., 2023, A proposal for a low-frequency axion search in the 1–2 μ eV range and below with the babyIAXO magnet, Annalen der Physik, Vol: 535, ISSN: 0003-3804

In the near future BabyIAXO will be the most powerful axion helioscope,relying on a custom-made magnet of two bores of 70 cm diameter and 10 mlong, with a total available magnetic volume of more than 7 m3. In thisdocument, it proposes and describe the implementation of low-frequencyaxion haloscope setups suitable for operation inside the BabyIAXO magnet.The RADES proposal has a potential sensitivity to the axion-photon couplingga𝜸 down to values corresponding to the KSVZ model, in the (currentlyunexplored) mass range between 1 and 2 𝛍 eV, after a total effective exposureof 440 days. This mass range is covered by the use of four differentlydimensioned 5-meter-long cavities, equipped with a tuning mechanism basedon inner turning plates. A setup like the one proposed will also allow anexploration of the same mass range for hidden photons coupled to photons.An additional complementary apparatus is proposed using LC circuits andexploring the low energy range (≈ 10−4 − 10−1 𝛍 eV). The setup includes acryostat and cooling system to cool down the BabyIAXO bore down to about 5K, as well as an appropriate low-noise signal amplification anddetection chain.

Journal article

Smorra C, Abbass F, Schweitzer D, Bohman M, Devine JD, Dutheil Y, Hobl A, Arndt B, Bauer BB, Devlin JA, Erlewein S, Fleck M, Jäger JI, Latacz BM, Micke P, Schiffelholz M, Umbrazunas G, Wiesinger M, Will C, Wursten E, Yildiz H, Blaum K, Matsuda Y, Mooser A, Ospelkaus C, Quint W, Soter A, Walz J, Yamazaki Y, Ulmer Set al., 2023, BASE-STEP: a transportable antiproton reservoir for fundamental interaction studies, Review of Scientific Instruments, Vol: 94, ISSN: 0034-6748

Currently, the world's only source of low-energy antiprotons is the AD/ELENA facility located at CERN. To date, all precision measurements on single antiprotons have been conducted at this facility and provide stringent tests of fundamental interactions and their symmetries. However, magnetic field fluctuations from the facility operation limit the precision of upcoming measurements. To overcome this limitation, we have designed the transportable antiproton trap system BASE-STEP to relocate antiprotons to laboratories with a calm magnetic environment. We anticipate that the transportable antiproton trap will facilitate enhanced tests of charge, parity, and time-reversal invariance with antiprotons and provide new experimental possibilities of using transported antiprotons and other accelerator-produced exotic ions. We present here the technical design of the transportable trap system. This includes the transportable superconducting magnet, the cryogenic inlay consisting of the trap stack and detection systems, and the differential pumping section to suppress the residual gas flow into the cryogenic trap chamber.

Journal article

Latacz BM, Arndt BP, Devlin JA, Erlewein SR, Fleck M, Jäger JI, Micke P, Umbrazunas G, Wursten E, Abbass F, Schweitzer D, Wiesinger M, Will C, Yildiz H, Blaum K, Matsuda Y, Mooser A, Ospelkaus C, Smorra C, Sótér A, Quint W, Walz J, Yamazaki Y, Ulmer Set al., 2023, Ultra-thin polymer foil cryogenic window for antiproton deceleration and storage., Rev Sci Instrum, Vol: 94

We present the design and characterization of a cryogenic window based on an ultra-thin aluminized biaxially oriented polyethylene terephthalate foil at T < 10 K, which can withstand a pressure difference larger than 1 bar at a leak rate <1×10-9 mbar l/s. Its thickness of ∼1.7 μm makes it transparent to various types of particles over a broad energy range. To optimize the transfer of 100 keV antiprotons through the window, we tested the degrading properties of different aluminum coated polymer foils of thicknesses between 900 and 2160 nm, concluding that 1760 nm foil decelerates antiprotons to an average energy of 5 keV. We have also explicitly studied the permeation as a function of coating thickness and temperature and have performed extensive thermal and mechanical endurance and stress tests. Our final design integrated into the experiment has an effective open surface consisting of seven holes with a diameter of 1 mm and will transmit up to 2.5% of the injected 100 keV antiproton beam delivered by the Antiproton Decelerator and Extra Low ENergy Antiproton ring facility of CERN.

Journal article

Latacz BM, Arndt BP, Bauer BB, Devlin JA, Erlewein SR, Fleck M, Jaeger JI, Schiffelholz M, Umbrazunas G, Wursten EJ, Abbass F, Micke P, Popper D, Wiesinger M, Will C, Yildiz H, Blaum K, Matsuda Y, Mooser A, Ospelkaus C, Quint W, Soter A, Walz J, Yamazaki Y, Smorra C, Ulmer Set al., 2023, BASE-high-precision comparisons of the fundamental properties of protons and antiprotons, EUROPEAN PHYSICAL JOURNAL D, Vol: 77, ISSN: 1434-6060

Journal article

Volksen F, Devlin JA, Borchert MJ, Erlewein SR, Fleck M, Jager J, Latacz BM, Micke P, Nuschke P, Umbrazunas G, Wursten EJ, Abbass F, Bohman MA, Popper D, Wiesinger M, Will C, Blaum K, Matsuda Y, Mooser A, Ospelkaus C, Smorra C, Soter A, Quint W, Walz J, Yamazaki Y, Ulmer Set al., 2022, A high-Q superconducting toroidal medium frequency detection system with a capacitively adjustable frequency range &gt;180 kHz, REVIEW OF SCIENTIFIC INSTRUMENTS, Vol: 93, ISSN: 0034-6748

Journal article

Will C, Bohman M, Driscoll T, Wiesinger M, Abbass F, Borchert MJ, Devlin JA, Erlewein S, Fleck M, Latacz B, Moller R, Mooser A, Popper D, Wursten E, Blaum K, Matsuda Y, Ospelkaus C, Quint W, Walz J, Smorra C, Ulmer Set al., 2022, Sympathetic cooling schemes for separately trapped ions coupled via image currents, NEW JOURNAL OF PHYSICS, Vol: 24, ISSN: 1367-2630

Journal article

Borchert MJ, Devlin JA, Erlewein SR, Fleck M, Harrington JA, Higuchi T, Latacz BM, Voelksen F, Wursten EJ, Abbass F, Bohman MA, Mooser AH, Popper D, Wiesinger M, Will C, Blaum K, Matsuda Y, Ospelkaus C, Quint W, Walz J, Yamazaki Y, Smorra C, Ulmer Set al., 2022, A 16-parts-per-trillion measurement of the antiproton-to-proton charge-mass ratio, NATURE, Vol: 601, Pages: 53-+, ISSN: 0028-0836

Journal article

Bohman M, Grunhofer V, Smorra C, Wiesinger M, Will C, Borchert MJ, Devlin JA, Erlewein S, Fleck M, Gavranovic S, Harrington J, Latacz B, Mooser A, Popper D, Wursten E, Blaum K, Matsuda Y, Ospelkaus C, Quint W, Walz J, Ulmer Set al., 2021, Sympathetic cooling of a trapped proton mediated by an LC circuit, NATURE, Vol: 596, Pages: 514-+, ISSN: 0028-0836

Journal article

Devlin JA, Borchert MJ, Erlewein S, Fleck M, Harrington JA, Latacz B, Warncke J, Wursten E, Bohman MA, Mooser AH, Smorra C, Wiesinger M, Will C, Blaum K, Matsuda Y, Ospelkaus C, Quint W, Walz J, Yamazaki Y, Ulmer Set al., 2021, Constraints on the Coupling between Axionlike Dark Matter and Photons Using an Antiproton Superconducting Tuned Detection Circuit in a Cryogenic Penning Trap, PHYSICAL REVIEW LETTERS, Vol: 126, ISSN: 0031-9007

Journal article

Ho C, Devlin JA, Rabey I, Yzombard P, Lim J, Wright S, Fitch N, Hinds EA, Tarbutt MR, Sauer BEet al., 2020, New techniques for a measurement of the electron's electric dipole moment, New Journal of Physics, Vol: 22, ISSN: 1367-2630

The electric dipole moment of the electron (eEDM) can be measured with high precision using heavy polar molecules. In this paper, we report on a series of new techniques that have improved the statistical sensitivity of the YbF eEDM experiment. We increase the number of molecules participating in the experiment by an order of magnitude using a carefully designed optical pumping scheme. We also increase the detection efficiency of these molecules by another order of magnitude using an optical cycling scheme. In addition, we show how to destabilise dark states and reduce backgrounds that otherwise limit the efficiency of these techniques. Together, these improvements allow us to demonstrate a statistical sensitivity of 1.8 x 10⁻²⁸ e cm after one day of measurement, which is 1.2 times the shot-noise limit. The techniques presented here are applicable to other high-precision measurements using molecules.

Journal article

Smorra C, Stadnik YV, Blessing PE, Bohman M, Borchert MJ, Devlin JA, Erlewein S, Harrington JA, Higuchi T, Mooser A, Schneider G, Wiesinger M, Wursten E, Blaum K, Matsuda Y, Ospelkaus C, Quint W, Walz J, Yamazaki Y, Budker D, Ulmer Set al., 2019, Direct limits on the interaction of antiprotons with axion-like dark matter, NATURE, Vol: 575, Pages: 310-+, ISSN: 0028-0836

Journal article

Devlin JA, Wursten E, Harrington JA, Higuchi T, Blessing PE, Borchert MJ, Erlewein S, Hansen JJ, Morgner J, Bohman MA, Mooser AH, Smorra C, Wiesinger M, Blaum K, Matsuda Y, Ospelkaus C, Quint W, Walz J, Yamazaki Y, Ulmer Set al., 2019, Superconducting Solenoid System with Adjustable Shielding Factor for Precision Measurements of the Properties of the Antiproton, PHYSICAL REVIEW APPLIED, Vol: 12, ISSN: 2331-7019

Journal article

Caldwell L, Devlin J, Williams H, Fitch N, Hinds E, Sauer B, Tarbutt Met al., 2019, Deep Laser Cooling and Efficient Magnetic Compression of Molecules, Physical Review Letters, Vol: 123, ISSN: 0031-9007

We introduce a scheme for deep laser cooling of molecules based on robust dark states at zero velocity. By simulating this scheme, we show it to be a widely applicable method that can reach the recoil limit or below. We demonstrate and characterise the method experimentally, reachinga temperature of 5.4(7) μK. We solve a general problem of measuring low temperatures for large clouds by rotating the phase-space distribution and then directly imaging the complete velocity distribution. Using the same phase-space rotation method, we rapidly compress the cloud. Applying the cooling method a second time, we compress both the position and velocity distributions.

Journal article

Borchert MJ, Blessing PE, Devlin JA, Harrington JA, Higuchi T, Morgner J, Smorra C, Wursten E, Bohman M, Wiesinger M, Mooser A, Blaum K, Matsuda Y, Ospelkaus C, Quint W, Walz J, Yamazaki Y, Ulmer Set al., 2019, Measurement of Ultralow Heating Rates of a Single Antiproton in a Cryogenic Penning Trap, PHYSICAL REVIEW LETTERS, Vol: 122, ISSN: 0031-9007

Journal article

Devlin J, Tarbutt M, 2018, Laser cooling and magneto-optical trapping of molecules analyzed using optical Bloch equations and the Fokker-Planck-Kramers equation, Physical Review A, Vol: 98, ISSN: 1050-2947

We study theoretically the behavior of laser-cooled calcium monofluoride (CaF) molecules in an optical molasses and magneto-optical trap (MOT), and compare our results to recent experiments. We use multilevel optical Bloch equations to estimate the force and the diffusion constant, followed by a Fokker-Planck-Kramers equation to calculate the time evolution of the velocity distribution. The calculations are done in three dimensions, and we include all the relevant energy levels of the molecule and all the relevant frequency components of the light. Similar to simpler model systems, the velocity-dependent force curve exhibits Doppler and polarization-gradient forces of opposite signs. We show that the temperature of the MOT is governed mainly by the balance of these two forces. Our calculated MOT temperatures and photon scattering rates are in broad agreement with those measured experimentally over a wide range of parameters. In a blue-detuned molasses, the temperature is determined by the balance of polarization-gradient cooling, and heating due to momentum diffusion, with no significant contribution from Doppler heating. In the molasses, we calculate a damping rate similar to the measured one, and steady-state temperatures that have the same dependence on laser intensity and applied magnetic field as measured experimentally, but are consistently a few times smaller than measured. We attribute the higher temperatures in the experiments to fluctuations of the dipole force which are not captured by our model. We show that the photon scattering rate is strongly influenced by the presence of dark states in the system, but that the scattering rate does not go to zero even for stationary molecules because of the transient nature of the dark states.

Journal article

Smorra C, Blessing PE, Borchert MJ, Devlin JA, Harrington JA, Higuchi T, Morgner J, Nagahama H, Sellner S, Bohman MA, Mooser AH, Schneider GL, Schoen N, Wiesinger M, Blaum K, Matsuda Y, Ospelkaus C, Quint W, Walz J, Yamazaki Y, Ulmer Set al., 2018, 350-fold improved measurement of the antiproton magnetic moment using a multi-trap method, HYPERFINE INTERACTIONS, Vol: 239, ISSN: 0304-3843

Journal article

Higuchi T, Harrington JA, Borchert MJ, Blessing PE, Devlin JA, Morgner J, Sellner S, Smorra C, Bohman MA, Mooser AH, Schneider GL, Schoen N, Wiesinger M, Blaum K, Matsuda Y, Ospelkaus C, Quint W, Walz J, Yamazaki Y, Ulmer Set al., 2018, Progress towards an improved comparison of the proton-to-antiproton charge-to-mass ratios, HYPERFINE INTERACTIONS, Vol: 239, ISSN: 0304-3843

Journal article

Lim J, Almond J, Trigatzis M, Devlin J, Fitch N, Sauer B, Tarbutt M, Hinds Eet al., 2018, Laser cooled YbF molecules for measuring the electron's electric dipole moment, Physical Review Letters, Vol: 120, ISSN: 0031-9007

We demonstrate one-dimensional sub-Doppler laser cooling of a beam of YbF molecules to 100 μK. This is a key step towards a measurement of the electron's electric dipole moment using ultracold molecules. We compare the effectiveness of magnetically-assisted and polarization-gradient sub-Doppler cooling mechanisms. We model the experiment and fi nd good agreement with our data.

Journal article

Jarvis KN, Devlin JA, Wall TE, Sauer BE, Tarbutt MRet al., 2018, Blue-detuned magneto-optical trap, Physical Review Letters, Vol: 120, ISSN: 0031-9007

We present the properties and advantages of a new magneto-optical trap (MOT) where blue- detuned light drives ‘type-II’ transitions that have dark ground states. Using ⁸⁷Rb, we reach a radiation-pressure-limited density exceeding 10¹¹ cm⁻³ and a temperature below 30 μK. The phase-space density is higher than in normal atomic MOTs, and a million times higher than comparable red-detuned type-II MOTs, making the blue-detuned MOT particularly attractive for molecular MOTs which rely on type-II transitions. The loss of atoms from the trap is dominated by ultracold collisions between Rb atoms. For typical trapping conditions, we measure a loss rate of 1.8(4) × 10⁻¹⁰ cm³ s⁻¹.

Journal article

Sauer BE, Devlin JA, Rabey IM, 2017, A big measurement of a small moment, New Journal of Physics, Vol: 19, ISSN: 1367-2630

A beam of ThO molecules has been used to make the most precise measurement of the electron's electric dipole moment (EDM) to date. In their recent paper, the ACME collaboration set out in detail their experimental and data analysis techniques. In a tour-de-force, they explain the many ways in which their apparatus can produce a signal which mimics the EDM and show how these systematic effects are measured and controlled.

Journal article

Devlin J, Tarbutt M, 2016, Three-dimensional Doppler, polarization-gradient, and magneto-optical forces for atoms and molecules with dark states, New Journal of Physics, Vol: 18, ISSN: 1367-2630

We theoretically investigate the damping and trapping forces in a three-dimensional magneto-optical trap (MOT), by numerically solving the optical Bloch equations. We focus on the case where there are dark states because the atom is driven on a ”type-II" system where the angular momentum of the excited state, F', is less than or equal to that of the ground state, F. For these systems we find that the force in a three-dimensional light field has very different behaviour to its one-dimensional counterpart. This differs from the more commonly used “type-I" systems (F' = F +1) where the 1D and 3D behaviours are similar. Unlike type-I systems where, for red-detuned light, both Doppler and sub-Doppler forces damp the atomic motion towards zero velocity, in type-II systems in 3D, the Doppler force and polarization gradient force have opposite signs. As a result, the atom is driven towards a non-zero equilibrium velocity, v₀, where the two forces cancel. We find that v₀² scales linearly with the intensity of the light and is fairly insensitive to the detuning from resonance. We also discover a new magneto-optical force that alters the normal MOT force at low magnetic fields and whose influence is greatest in the type-II systems. We discuss the implications of these findings for the laser cooling and magneto-optical trapping of molecules where type-II transitions are unavoidable in realising closed optical cycling transitions.

Journal article

Rabey IM, Devlin JA, Hinds EA, Sauer BEet al., 2016, Low magnetic Johnson noise electric field plates for precision measurement, Review of Scientific Instruments, Vol: 87, ISSN: 1089-7623

We describe a parallel pair of high voltage electric field plates designed and constructed to minimise magnetic Johnson noise. They are formed by laminating glass substrates with commercially available polyimide (Kapton) tape, covered with a thin gold film. Tested in vacuum, the outgassing rate is less than 5 x 10 exp(-5) mbar.l/s. The plates have been operated at electric fields up to 8.3 kV/cm, when the leakage current is at most a few hundred pA. The design is discussed in the context of a molecular spin precession experiment to measure the permanent electric dipole moment of the electron.

Journal article

Devlin J, Tarbutt MR, Kokkin DL, Steimle TCet al., 2015, Measurements of the Zeeman effect in the A(2)Pi and B-2 Sigma(+) states of calcium fluoride, Journal of Molecular Spectroscopy, Vol: 317, Pages: 1-9, ISSN: 1096-083X

The magnetic tuning of the low rotational levels in the (v = 0) X2Σ+, (v = 0) A2Π, and (v = 0) B2Σ+ electronic states of calcium monofluoride, CaF, have been experimentally investigated using high resolution optical Zeeman spectroscopy of a cold molecular beam. The observed Zeeman shifts and splittings are successfully modeled using a traditional effective Hamiltonian approach to account for the interaction between the (v = 0) A2Π and (v = 0) B2Σ+ states. The determined magnetic g-factors for the X2Σ+, B2Σ+ and A2Π states are compared to those predicted by perturbation theory.

Journal article

Sauer BE, Devlin JA, Hudson JJ, Kara DM, Smallman IJ, Tarbutt MR, Hinds EAet al., 2013, Time reversal symmetry violation in the YbF molecule, HYPERFINE INTERACTIONS, Vol: 214, Pages: 119-126, ISSN: 0304-3843

Journal article

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