Category Archives: Sources

Opportunities and Challenges for EIK’s in DNP NMR Applications #DNPNMR

Rosay, Melanie, Ivan Scrgeyev, Leo Tometich, Christopher Hickey, Albert Roitman, Doug Yake, and Dave Berry. “Opportunities and Challenges for EIK’s in DNP NMR Applications.” In 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 1–2. Nagoya: IEEE, 2018.

https://doi.org/10.1109/IRMMW-THz.2018.8510328

Modern Dynamic Nuclear Polarization (DNP) experiments often utilize gyrotron sources for irradiation of electron spins at 140-593 GHz. The total cost of ownership, size, and complexity of gyrotrons, however, limits wider adoption. The introduction of lower-cost and more compact sources can have a significant impact on the DNP community. This contribution describes the development of a 263 GHz EIK, design of transmission line for optimal irradiation of the DNP NMR sample, and detailed performance characterization for DNP experiments.

High power Continuously Frequency-tunable Terahertz Radiation Sources and Transmission Lines for DNP-enhanced NMR System #DNPNMR

Liu, Diwei, Tao Song, Hao Shen, Jie Huang, Ning Zhang, Chenghai Wang, Wei Wang, and Shenggang Liu. “High Power Continuously Frequency-Tunable Terahertz Radiation Sources and Transmission Lines for DNP-Enhanced NMR System.” In 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 1–2. Nagoya: IEEE, 2018. 

https://doi.org/10.1109/IRMMW-THz.2018.8510299

The effect of the electron beam quality of a 250GHz continuously frequency-tunable gyrotron used for Dynamic Nuclear Polarization enhanced Nuclear Magnetic Resonance is tuned by changing the operating voltage V0 or the operating magnetic field B0 on the operating frequency and the beam-wave interaction efficiency is investigated. Meanwhile, an improved transmission and mirror system with a well-focused Gaussian-like output beam is designed to match the DNP-NMR sample.

Open Position at Bridge12: Technician

Bridge12 has currently two job openings, one for a research scientist and one for a technician. You can find the original posting at http://www.bridge12.com/careers


Open Position: Technician
Bridge12 is a privately-held startup company focusing on the development of cutting-edge, high-power microwave and terahertz sources and systems for use in scientific research such as magnetic resonance spectroscopy, communication systems and industrial applications. The company has a worldwide customer base and conducts groundbreaking research on applications of microwaves and terahertz in novel fields and has been successful in launching several innovative products based on Small Business Innovation Research (SBIR) grants from several federal agencies. Bridge12 is in the progress of expanding it’s team and has currently an opening for a Technician.
Job Description

As a Technician at Bridge12, your work will be multidisciplinary involving all aspects of mechanical design, assembling of prototypes, including quality control and testing of the final instruments. You will be working under the guidance of a Bridge12 scientist. In this specific role your tasks include:

  • Mechanical design using state-of-the-art 3D CAD software
  • Preparation of engineering drawings
  • Work on the product assembly and testing
  • Maintenance of laboratory equipment
  • Documentation of design process
  • Requesting quotes for manufacturing and negotiate pricing with suppliers
  • Preparing manufacturing cost estimates for parts and subassemblies

Required Skills

  • Excellent proficiency in engineering drawing (2D and 3D)
  • Experience in manufacturing methods, procedures and preparation
  • Basic knowledge of electrical test equipment
  • Experience with vacuum systems
  • Excellent working organization and scheduling
  • Excellent verbal and written communication skills and good team work ethics
  • General interest and curiosity in the development of cutting-edge THz technology
  • PCB design and prototyping (optional)

Experience: 2-4 years of experience in similar or related fields and/or post-secondary technical education.
Benefits: Excellent benefits including Medical & Dental coverage and 401k (with match)
Visa Status: US Citizen, valid US work visa or Permanent Resident

Contact InformationReference Number: T021308
Please email Resume or CV with a cover letter to: careers@bridge12.com

Open Position at Bridge12: Technician

Bridge12 has currently two job openings, one for a research scientist and one for a technician. You can find the original posting at http://www.bridge12.com/careers


Open Position: Technician
Bridge12 is a privately-held startup company focusing on the development of cutting-edge, high-power microwave and terahertz sources and systems for use in scientific research such as magnetic resonance spectroscopy, communication systems and industrial applications. The company has a worldwide customer base and conducts groundbreaking research on applications of microwaves and terahertz in novel fields and has been successful in launching several innovative products based on Small Business Innovation Research (SBIR) grants from several federal agencies. Bridge12 is in the progress of expanding it’s team and has currently an opening for a Technician.
Job Description

As a Technician at Bridge12, your work will be multidisciplinary involving all aspects of mechanical design, assembling of prototypes, including quality control and testing of the final instruments. You will be working under the guidance of a Bridge12 scientist. In this specific role your tasks include:

  • Mechanical design using state-of-the-art 3D CAD software
  • Preparation of engineering drawings
  • Work on the product assembly and testing
  • Maintenance of laboratory equipment
  • Documentation of design process
  • Requesting quotes for manufacturing and negotiate pricing with suppliers
  • Preparing manufacturing cost estimates for parts and subassemblies

Required Skills

  • Excellent proficiency in engineering drawing (2D and 3D)
  • Experience in manufacturing methods, procedures and preparation
  • Basic knowledge of electrical test equipment
  • Experience with vacuum systems
  • Excellent working organization and scheduling
  • Excellent verbal and written communication skills and good team work ethics
  • General interest and curiosity in the development of cutting-edge THz technology
  • PCB design and prototyping (optional)

Experience: 2-4 years of experience in similar or related fields and/or post-secondary technical education.
Benefits: Excellent benefits including Medical & Dental coverage and 401k (with match)
Visa Status: US Citizen, valid US work visa or Permanent Resident

Contact InformationReference Number: T021308
Please email Resume or CV with a cover letter to: careers@bridge12.com

DNP enhanced NMR using a high-power 94 GHz microwave source: a study of the TEMPOL radical in toluene

This paper was already published in 2010 but I just came across it recently. Please let me know if there are any papers you would like to see posted here, or that I missed. 

Kryukov, E.V., et al., DNP enhanced NMR using a high-power 94 GHz microwave source: a study of the TEMPOL radical in toluene. Phys Chem Chem Phys, 2010. 12(22): p. 5757-65.

http://www.ncbi.nlm.nih.gov/pubmed/20442952

DNP enhanced (1)H NMR at 143 MHz in toluene is investigated using an NMR spectrometer coupled with a modified EPR spectrometer operating at 94 GHz and TEMPOL as the polarisation agent. A 100 W microwave amplifier was incorporated into the output stage of the EPR instrument so that high microwave powers could be delivered to the probe in either CW or pulsed mode. The maximum enhancement for the ring protons increases from approximately -16 for a 5 mM TEMPOL solution to approximately -50 for a 20 mM solution at a microwave power of approximately 480 mW. The temperature dependence of the enhancement, the NMR relaxation rates and the ESR spectrum of TEMPOL were also studied in an effort to obtain information on the dynamics of the system.

DNP enhanced NMR using a high-power 94 GHz microwave source: a study of the TEMPOL radical in toluene

This paper was already published in 2010 but I just came across it recently. Please let me know if there are any papers you would like to see posted here, or that I missed. 

Kryukov, E.V., et al., DNP enhanced NMR using a high-power 94 GHz microwave source: a study of the TEMPOL radical in toluene. Phys Chem Chem Phys, 2010. 12(22): p. 5757-65.

http://www.ncbi.nlm.nih.gov/pubmed/20442952

DNP enhanced (1)H NMR at 143 MHz in toluene is investigated using an NMR spectrometer coupled with a modified EPR spectrometer operating at 94 GHz and TEMPOL as the polarisation agent. A 100 W microwave amplifier was incorporated into the output stage of the EPR instrument so that high microwave powers could be delivered to the probe in either CW or pulsed mode. The maximum enhancement for the ring protons increases from approximately -16 for a 5 mM TEMPOL solution to approximately -50 for a 20 mM solution at a microwave power of approximately 480 mW. The temperature dependence of the enhancement, the NMR relaxation rates and the ESR spectrum of TEMPOL were also studied in an effort to obtain information on the dynamics of the system.

Open Position at Bridge12: Scientist – Microwave and Terahertz Systems

Bridge12 is happy to announce a job opening. You can find the original posting at http://www.bridge12.com/careers

Open Position: Scientist – Microwave and Terahertz Systems

Bridge12 is a privately-held startup company focusing on the development of cutting-edge, high-power microwave and terahertz sources and systems for use in scientific research such as magnetic resonance spectroscopy, communication systems and industrial applications. The company has a worldwide customer base and conducts groundbreaking research on applications of microwaves and terahertz in novel fields and has been successful in launching several innovative products based on Small Business Innovation Research (SBIR) grants from several federal agencies.

Job Description

As a scientist at Bridge12, you will work on multidisciplinary projects that involve all aspects of microwave/terahertz source design, development of physical prototyping, and system-level testing including testing of the final application. You will also take leadership in conceiving new products based on innovative techniques for generating high THz power in compact systems for scientific and industrial applications and discover new applications for high-power terahertz sources. You will have the opportunity to write grant proposals for innovative product development to agencies like the National Science Foundation, National Institutes of Health, Department of Energy and Department of Defense. You will have to set milestones, schedules and budgets for your projects. There could be occasional travel associated with attending research conferences, tradeshows or to visit collaborators. In this specific role you will work on the development of novel systems such as:

· Traveling wave tubes (TWT) from E-band (71-76 GHz) up to 500 GHz

· Gyrotron oscillators and amplifiers from W-Band (75-110 GHz) up to 500 GHz

· High-power, high-repetition-rate pulsed power supplies

· Dual-frequency RF/Terahertz design of innovative Nuclear Magnetic Resonance (NMR) and Electron Paramagnetic Resonance (EPR) probes for application in Dynamic Nuclear Polarization (DNP)

· High-power, low-loss transmission line systems for microwave and terahertz propagation

Required Skills & Experience

· 2-4 years of research and development of vacuum electronics based sources (e.g. TWTs, gyrotrons) and microwave engineering

· 2-4 years of experience in experimental research. Laboratory experience in working with high voltage (10-150 kV) and high magnetic fields (~10 T) 

· Microwave measurement techniques including the use of a Vector Network Analyzer

· Must have experience using RF simulation tools such as CST Microwave Studio, Ansys HFSS (High Frequency Simulation Software) and Ansys Thermal and Mechanical simulation tools. Prior experience in the use of Particle-in-Cell (PIC) simulation tools is preferred

· Proficiency writing scripts using Python, Matlab and other modern scripting tools

· Experience in grant proposal writing

· Excellent verbal and written communication skills and good team work ethics

Optional Skills & Experience

· PCB design and prototyping

· Code development for electromagnetic wave propagation and beam-wave interaction

· Microfabrication techniques

Education: B.S. in Electrical or Mechanical Engineering or Physics (M.S. or Ph.D. preferred)

Benefits: Excellent benefits including Medical & Dental coverage and 401K (with match)

Visa Status: Valid US work visa. US Citizen or Permanent Resident is preferred as some of our US government contracts allow only US Citizens to perform work

Contact Information

Reference Number: S011307

Please email Resume or CV with a cover letter to: careers@bridge12.com

Open Position at Bridge12: Scientist – Microwave and Terahertz Systems

Bridge12 is happy to announce a job opening. You can find the original posting at http://www.bridge12.com/careers

Open Position: Scientist – Microwave and Terahertz Systems

Bridge12 is a privately-held startup company focusing on the development of cutting-edge, high-power microwave and terahertz sources and systems for use in scientific research such as magnetic resonance spectroscopy, communication systems and industrial applications. The company has a worldwide customer base and conducts groundbreaking research on applications of microwaves and terahertz in novel fields and has been successful in launching several innovative products based on Small Business Innovation Research (SBIR) grants from several federal agencies.

Job Description

As a scientist at Bridge12, you will work on multidisciplinary projects that involve all aspects of microwave/terahertz source design, development of physical prototyping, and system-level testing including testing of the final application. You will also take leadership in conceiving new products based on innovative techniques for generating high THz power in compact systems for scientific and industrial applications and discover new applications for high-power terahertz sources. You will have the opportunity to write grant proposals for innovative product development to agencies like the National Science Foundation, National Institutes of Health, Department of Energy and Department of Defense. You will have to set milestones, schedules and budgets for your projects. There could be occasional travel associated with attending research conferences, tradeshows or to visit collaborators. In this specific role you will work on the development of novel systems such as:

· Traveling wave tubes (TWT) from E-band (71-76 GHz) up to 500 GHz

· Gyrotron oscillators and amplifiers from W-Band (75-110 GHz) up to 500 GHz

· High-power, high-repetition-rate pulsed power supplies

· Dual-frequency RF/Terahertz design of innovative Nuclear Magnetic Resonance (NMR) and Electron Paramagnetic Resonance (EPR) probes for application in Dynamic Nuclear Polarization (DNP)

· High-power, low-loss transmission line systems for microwave and terahertz propagation

Required Skills & Experience

· 2-4 years of research and development of vacuum electronics based sources (e.g. TWTs, gyrotrons) and microwave engineering

· 2-4 years of experience in experimental research. Laboratory experience in working with high voltage (10-150 kV) and high magnetic fields (~10 T) 

· Microwave measurement techniques including the use of a Vector Network Analyzer

· Must have experience using RF simulation tools such as CST Microwave Studio, Ansys HFSS (High Frequency Simulation Software) and Ansys Thermal and Mechanical simulation tools. Prior experience in the use of Particle-in-Cell (PIC) simulation tools is preferred

· Proficiency writing scripts using Python, Matlab and other modern scripting tools

· Experience in grant proposal writing

· Excellent verbal and written communication skills and good team work ethics

Optional Skills & Experience

· PCB design and prototyping

· Code development for electromagnetic wave propagation and beam-wave interaction

· Microfabrication techniques

Education: B.S. in Electrical or Mechanical Engineering or Physics (M.S. or Ph.D. preferred)

Benefits: Excellent benefits including Medical & Dental coverage and 401K (with match)

Visa Status: Valid US work visa. US Citizen or Permanent Resident is preferred as some of our US government contracts allow only US Citizens to perform work

Contact Information

Reference Number: S011307

Please email Resume or CV with a cover letter to: careers@bridge12.com

High Power Wideband Gyrotron Backward Wave Oscillator Operating towards the Terahertz Region

He, W., et al., High Power Wideband Gyrotron Backward Wave Oscillator Operating towards the Terahertz Region. Phys. Rev. Lett., 2013. 110(16): p. 165101.

http://www.ncbi.nlm.nih.gov/pubmed/23679610

Experimental results are presented of the first successful gyrotron backward wave oscillator (gyro-BWO) with continuous frequency tuning near the low-terahertz region. A helically corrugated interaction region was used to allow efficient interaction over a wide frequency band at the second harmonic of the electron cyclotron frequency without parasitic output. The gyro-BWO generated a maximum output power of 12 kW when driven by a 40 kV, 1.5 A, annular-shaped large-orbit electron beam and achieved a frequency tuning band of 88-102.5 GHz by adjusting the cavity magnetic field. The performance of the gyro-BWO is consistent with 3D particle-in-cell numerical simulations.

High Power Wideband Gyrotron Backward Wave Oscillator Operating towards the Terahertz Region

He, W., et al., High Power Wideband Gyrotron Backward Wave Oscillator Operating towards the Terahertz Region. Phys. Rev. Lett., 2013. 110(16): p. 165101.

http://www.ncbi.nlm.nih.gov/pubmed/23679610

Experimental results are presented of the first successful gyrotron backward wave oscillator (gyro-BWO) with continuous frequency tuning near the low-terahertz region. A helically corrugated interaction region was used to allow efficient interaction over a wide frequency band at the second harmonic of the electron cyclotron frequency without parasitic output. The gyro-BWO generated a maximum output power of 12 kW when driven by a 40 kV, 1.5 A, annular-shaped large-orbit electron beam and achieved a frequency tuning band of 88-102.5 GHz by adjusting the cavity magnetic field. The performance of the gyro-BWO is consistent with 3D particle-in-cell numerical simulations.

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