People

Dr John Bulmer

Research Associate

Research Interests

  • Carbon Nanotube cable transport mechanisms & manufacturing methodologies
  • Microwave, millimeter-wave & THz materials characterization 
  • Raman spectroscopy
  • Superconductor electrodynamics & ultra-broadband transmitters

 

Current Situation

John is a Research Associate within the University of Cambridge Engineering Department, based at the Institute for Manufacturing in the Centre for Industrial Photonics Group, supervised by Prof Bill O'Neill, working on a project funded on the EPSRC.

 

 

Background

John graduated from the United States Air Force Academy in 2002 as a distinguished graduate with a Bachelor of Science double major in Physics and Mathematics. Over the next ten years, he served in the US Air Force where he flew Lear jets and managed a superconductivity laboratory at Air Force Research Laboratory in Dayton, Ohio. He was regularly company grade officer of the quarter at the division level and was the 2009 company grade officer of the year of Detachment 1 at Wright Patterson Air Force base (1 out of approximately 400 officers). He deployed twice to Afghanistan where he instructed Afghan leaders in modern command and control and liaised directly with the Afghan government, earning the Defense Meritorious Service Medal. John was also the chief investigator of a major experimental aircraft incident, leading a team of highly trained engineers in the day to day flow of the investigation.  

 

After honorably separating from active duty, the Air Force funded John’s PhD at the Department of Materials Science and Metallurgy at Cambridge University, where he was a student at Magdalene College. His PhD focused on the electrical transport of large-scale carbon nanotube cables with high frequency characterization in the microwave, millimeter, and THz regime. He also explored cryogenic magneto-transport in extreme magnetic fields beyond 60 Tesla with a self-initiated collaboration at the High Magnetic Field Laboratory at Los Alamos, New Mexico. He spearheaded a photonic manufacturing process that amplified the internal microstructure alignment of these carbon nanotube cables, as well as improved their graphitic crystallinity to the point where new Raman techniques were required to interpret the Raman response.  Working in parallel to his PhD, John developed novel superconducting transmitters for the efficient generation and control of tunable broadband microwave radiation.

 

Immediately after the PhD, John joined the Industrial Photonics group where he introduces state-of-the-art photonic manufacturing processes to state-of-the-art superconductors and carbon nanotube based conductors—aiming for efficient electrical power transmission from DC to daylight.

 

John is on the editorial board of Nature Scientific Reports.

 

Selected Journals

John S. Bulmer, Thurid S. Gspann, Jon S. Barnard, James A. Elliott. Chirality independent characteristic crystal length in carbon nanotube textiles measured by Raman spectroscopy. Carbon 115, 672–680 (2017).  ---March 2017 Dept of Materials Science paper on the Month!---

 

Krukiewicz, J.S. Bulmer, K.K.K. Koziol, J.K. Zak. Charging and discharging of the electrochemically swelled, aligned carbon nanotube fibers. Electrochemistry Communications 64, 30-34 (2016).

 

John Bulmer, Thomas Bullard, Brian Dolasinski, John Murphy, Martin Sparkes, Krste Pangovski, William O’Neill, Peter Powers, Timothy Haugan. Tunable Broadband Radiation Generated Via Ultrafast Laser Illumination of an Inductively Charged Superconducting Ring. Sci. Rep. 5, 18151 (2015).

 

Krukiewicz, J.S. Bulmer, D. Janas, K.K.K. Koziol, J.K. Zak. Poly (3, 4-ethylenedioxythiophene) growth on the surface of horizontally aligned MWCNT electrode.  Applied Surface Science 335, 130-136 (2015).

 

Lekawa-Raus, J. Patmore, L Kurzepa, J. Bulmer, K. Koziol. Electrical Properties of Carbon Nanotube Based Fibers and Their Future Use in Electrical Wiring. Adv. Funct. Mater. 24, 3661–3682 (2014).

 

Steven B. Fairchild, John S. Bulmer, Martin Sparkes, John Boeckl, Marc Cahay, Tyson Back, P. Terrence Murray, Gregg Gruen, Matthew Lange, Nathaniel P. Lockwood, Francisco Orozco, William O’Neill, Catharina Paukner, Krzysztof K. K. Koziol. Field emission from laser cut CNT fibers and films. J. Mater. Res. 29, No. 3 (2014).

 

Cahay, P. T. Murray, T. C. Back, S. Fairchild, J. Boeckl, J. Bulmer, K. K. K. Koziol, G. Gruen, M. Sparkes, F. Orozco, and W. O'Neill. Hysteresis during field emission from chemical vapor deposition synthesized carbon nanotube fibers. Appl. Phys. Lett. 105, 173107 (2014).

 

John S. Bulmer, Jon Martens, Lukasz Kurzepa, Tomasz Gizewski , M. Egilmez, M. G. Blamire, Noorhana Yahya, Krzysztof K. K. Koziol. Microwave Conductivity of Sorted CNT Assemblies. Scientific Reports 4, 3762 (2014).

 

John S. Bulmer, Dwight G. Rickel, Timothy J. Haugan. Switching Response of YBa2Cu3O7−δ to Simultaneous Application of Near-Critical Current, Field, and Temperature. IEEE Transactions on Applied Superconductivity 24, No. 1 (2014).  

 

Janas, A. Cabrero-Vilatela, J. Bulmer, L. Kurzepa, K. Koziol. Carbon nanotube wires for high-temperature performance. Carbon 64, 305 – 314 (2013). 

 

Latypov, J. Bulmer, Radiation and near field in resistance-inductor circuit transients. J. Appl. Phys. 111, 114907 (2012).

 

Varanasi, J. Petry, L. Brunke, B.T. Yang, W. Lanter, J. Burke, H. Wang, J.S. Bulmer, J. Scofield, P.N. Barnes. Growth of high-quality carbon nanotubes on free-standing diamond substrates. Carbon 48, No 9, 2442-2446 (2010).

 

A. Levin, P. N. Barnes, J. P. Rodriguez, J. A. Connors, J. S. Bulmer. Emergence of dissipative structures in current-carrying superconducting wires. Phys. Rev. E 79, 056224 (2009).  

 

George A. Levin, Paul N. Barnes, Jose P. Rodriguez, Jake A. Connors, John S. Bulmer. Stability and Normal Zone Propagation Speed in YBCO Coated Conductors With Increased Interfacial Resistance. IEEE Transactions on Applied Superconductivity 19, No. 3 (2009).

 

V. Varanasi., J. Bulmer, J. Brunke, L. Burke, J. Baca, K. Yost, P. Barnes. Growth and characterization of carbon nanotubes on constantan (Cu–Ni–Mn alloy) metallic substrates without adding additional catalysts.  Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 26, 832 (2008).

 

George A Levin, Paul N Barnes and John S Bulmer. Current sharing between superconducting film and normal metal. Supercond. Sci. Technol. 20, 757–764 (2007).

 

Conference Proceedings

 

Brian Dolasinski, John Bulmer, Thomas Bullard, Peter E. Powers, Joseph W. Haus, Timothy Haugan. Ultrafast photo response in superconductive isotropic radiators for microwave generation. Proc. SPIE 9347, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIV, 93470H (February 27, 2015); doi:10.1117/12.2083505.

 

Damir Latypov, John Bulmer. UWB Radiation from Superconductor Undergoing Fast Superconducting to Normal Transition. Proceedings of the 2011 IEEE National Aerospace and Electronics Conference (NAECON).

 

Bulmer, L. Christie, D. Anderson, G. Kozlowski, J. Petry, B. Quinton, C. Jayasinghe, G. Li, J. Lee, Haiyan Wan, B. Ruter- Schoppman, K. Yost, P. Barnes, Bulk carbon nanotube yarn conductivity and strength enhancement through high temperature annealing, Carbon 2010, Clemson, SC, July 2010.

 

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