MVE MURI 99 Kick-off Meeting R. Barker, Technical Monitor Started 1 May 99 October 1999 Overview of UCD MURI Gyro-Device Program PI: Prof. N.C. Luhmann, Jr. Staff: Y. Hirata and D.B. McDermott Students: R.C. Stutzman, S.B. Harriet, W.Y. Li, and L.J. Dressman Collaborating Scientists: D.A. Gallagher, Northrop Grumman A.T. Lin, UCLA T.A. Spencer, AFRL Q.S. Wang, Micramics Presenter: Y. Hirata MURI99 Kick-Off Meting SLACNovember 12, 1999

MVE MURI 99 Kick-off Meeting R. Barker, Technical Monitor Started 1 May 99 October 1999 OUTLINE UCD MURI Gyro-Device Program High Performance 94GHz Gyro-TWT Amplifier 94GHz Sixth-Harmonic Gyrotron Ka-Band Second-Harmonic Gyro-TWT Amplifier High Efficiency Ka-Band Second-Harmonic Peniotron

MVE MURI 99 Kick-off Meeting R. Barker, Technical Monitor Started 1 May 99 October 1999 High Performance 94 GHz TE 01 Gyro-TWT Amplifier Objectives Approach Accomplishments 50 kG Superconducting Magnet Extend DoD’s TWT technology into millimeter range Develop stable W-band 100kW gyro-amplifier Gyro-TWTs offer wide bandwidth TE 01 mode transmits high power Mode-selective circuit and loss stabilize amplifier by suppressing competing modes 94 GHz, 100 kW gyro-TWT is under construction - MIG gun is being fabricated - Modulator tested for 100W CC-TWT - Mode-selective circuit developed - Loss determined by stability codes -  =20% predicted by large-signal code

MVE MURI 99 Kick-off Meeting R. Barker, Technical Monitor Started 1 May 99 October 1999 Modeling and Design of a 100 kW, 94 GHz TE 01 Gyro-TWT HFSS for Coupler Design Electron Trajectories of MIG Linear Codes for Stability Nonlinear Codes for Saturation

MVE MURI 99 Kick-off Meeting R. Barker, Technical Monitor Started 1 May 99 October GHz Sixth-Harmonic Gyrotron (MURI 95) Objectives Approach Accomplishments 12-Vane Slotted Circuit Reduce magnetic field to make lighter and more practical HPM systems Develop kW W-band high harmonic gyrotrons Basis for high-harmonic gyro amplifiers Operation at s th -harmonic reduces magnetic field by factor of s Cusp gun produces needed axis- encircling electron beam Slotted circuit enhances interaction Two Northrop Cusp guns received 94GHz 6 th -harmonic gyrotron design - 50 kW with 20% efficiency - Under construction 94GHz 8 th -harmonic gyrotron design - Employs permanent magnet

MVE MURI 99 Kick-off Meeting R. Barker, Technical Monitor Started 1 May 99 October 1999 Ka-Band Second-Harmonic Gyro-TWT Amplifier Objectives Approach Accomplishments Northrop Grumman Cusp Gun Harmonic gyro-devices are more stable and yield higher power Sliced mode-selective circuit suppresses competing modes Axis-encircling electrons will yield full efficiency in linearly polarized mode-selective circuit Improve stability and power level of gyrotron amplifiers Increase efficiency and frequency of our recent 200kW Ku-band TE 21 second-harmonic gyro-TWT 35GHz, 50 kW gyro-TWT designed with  =20% - Employs Northrop Cusp gun - Tested designed 0 dB coupler - Tested mode-selective circuit - Determined loss with stability codes

MVE MURI 99 Kick-off Meeting R. Barker, Technical Monitor Started 1 May 99 October 1999 High Efficiency Ka-Band Second-Harmonic Peniotron Objectives Approach Accomplishments 4-Vane Slotted Circuit Received two Northrop Cusp guns 35GHz 2 nd -harmonic peniotron design kW with 50% device efficiency - Employs Northrop Cusp gun s th -harmonic peniotron excites m th -order azimuthal mode with m=s+1 Slotted circuit enhances interaction and allows desired m th -order symmetry in stable, lowest-order mode Cusp gun produces needed axis-encircling electron beam Improve device efficiency of Tohoku’s recent third-harmonic  =35% peniotron Achieve device efficiency > 50% in harmonic gyro-device Foundation for peniotron-amplifiers

MVE MURI 99 Kick-off Meeting R. Barker, Technical Monitor Started 1 May 99 October 1999 Facilities and Equipment (1) Modulator #1 Network AnalyzerTWTs Modulator #2

MVE MURI 99 Kick-off Meeting R. Barker, Technical Monitor Started 1 May 99 October 1999 Facilities and Equipment (2) Frequency Multiplier Test SetupSuper-Conducting Magnets W-Band TWT Phase-Noise Test Stand