Pulsed klystrons with feedback controlled mod-anode modulators

Reass, William A; Baca, David M; Jerry, Davis L; Rees, Daniel E

doi:10.1049/cp.2009.1675

Title: Pulsed klystrons with feedback controlled mod-anode modulators

Full Record
Other Related Research

Abstract

This paper describes a fast rise and fall, totem-pole mod-anode modulators for klystron application. Details of these systems as recently installed utilizing a beam switch tube ''on-deck'' and a planar triode ''off-deck'' in a grid-catch feedback regulated configuration will be provided. The grid-catch configuration regulates the klystron mod-anode voltage at a specified set-point during switching as well as providing a control mechanism that flat-top regulates the klystron beam current during the pulse. This flat-topped klystron beam current is maintained while the capacitor bank droops. In addition, we will review more modern on-deck designs using a high gain, high voltage planar triode as a regulating and switching element. These designs are being developed, tested, and implemented for the Los Alamos Neutron Science Center (LANSCE) accelerator refurbishment project, ''LANSCE-R''. An advantage of the planar triode is that the tube can be directly operated with solid state linear components and provides for a very compact design. The tubes are inexpensive compared to stacked semiconductor switching assemblies and also provide a linear control capability. Details of these designs are provided as well as operational and developmental results.

Authors:

Reass, William A ^[1]; Baca, David M ^[1]; Jerry, Davis L ^[1]; Rees, Daniel E ^[1]

Los Alamos National Laboratory

Publication Date:: Thu Jan 01 00:00:00 EST 2009

Research Org.:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 992205

Report Number(s):: LA-UR-09-05310; LA-UR-09-5310
TRN: US1007700

DOE Contract Number:: AC52-06NA25396

Resource Type:: Conference

Resource Relation:: Conference: European Pulsed Power Conference 2009 ; September 21, 2009 ; Geneva, Switzerland

Country of Publication:: United States

Language:: English

Subject:: 43 PARTICLE ACCELERATORS; ACCELERATORS; BEAM CURRENTS; CAPACITORS; CONFIGURATION; DESIGN; FEEDBACK; KLYSTRONS; NEUTRONS

Citation Formats


                    Reass, William A, Baca, David M, Jerry, Davis L, and Rees, Daniel E. Pulsed klystrons with feedback controlled mod-anode modulators.  United States: N. p., 2009. 
        Web.  doi:10.1049/cp.2009.1675.

Copy to clipboard


                    Reass, William A, Baca, David M, Jerry, Davis L, & Rees, Daniel E. Pulsed klystrons with feedback controlled mod-anode modulators.  United States.  https://doi.org/10.1049/cp.2009.1675

Copy to clipboard


                    Reass, William A, Baca, David M, Jerry, Davis L, and Rees, Daniel E. 2009.  
        "Pulsed klystrons with feedback controlled mod-anode modulators".  United States.  https://doi.org/10.1049/cp.2009.1675.  https://www.osti.gov/servlets/purl/992205.

Copy to clipboard


                    
@article{osti_992205,

  title        = {Pulsed klystrons with feedback controlled mod-anode modulators},

  author       = {Reass, William A and Baca, David M and Jerry, Davis L and Rees, Daniel E},

  abstractNote = {This paper describes a fast rise and fall, totem-pole mod-anode modulators for klystron application. Details of these systems as recently installed utilizing a beam switch tube ''on-deck'' and a planar triode ''off-deck'' in a grid-catch feedback regulated configuration will be provided. The grid-catch configuration regulates the klystron mod-anode voltage at a specified set-point during switching as well as providing a control mechanism that flat-top regulates the klystron beam current during the pulse. This flat-topped klystron beam current is maintained while the capacitor bank droops. In addition, we will review more modern on-deck designs using a high gain, high voltage planar triode as a regulating and switching element. These designs are being developed, tested, and implemented for the Los Alamos Neutron Science Center (LANSCE) accelerator refurbishment project, ''LANSCE-R''. An advantage of the planar triode is that the tube can be directly operated with solid state linear components and provides for a very compact design. The tubes are inexpensive compared to stacked semiconductor switching assemblies and also provide a linear control capability. Details of these designs are provided as well as operational and developmental results.},

  doi          = {10.1049/cp.2009.1675},

  url          = {https://www.osti.gov/biblio/992205},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Thu Jan 01 00:00:00 EST 2009},

  month        = {Thu Jan 01 00:00:00 EST 2009}

}

Copy to clipboard

Conference:

View Conference (2.54 MB)

https://doi.org/10.1049/cp.2009.1675

Other availability

Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Klystron Modulator Design for the Los Alamos Neutron Science Center Accelerator

Conference Reass, William; Baca, David; Partridge, Edward; ...

This paper will describe the design of the 44 modulator systems that will be installed to upgrade the Los Alamos Neutron Science Center (LANSCE) accelerator RF system. The klystrons can operate up to 86 kV with a nominal 32 Amp beam current with a 120 Hz repetition rate and 15% duty cycle. The klystrons are a mod-anode design. The modulator is designed with analog feedback control to ensure the klystron beam current is flat-top regulated. To achieve fast switching while maintaining linear feedback control, a grid-clamp, totem-pole modulator configuration is used with an 'on' deck and an 'off' deck. Themore »« less
https://doi.org/10.1109/IPMHVC.2012.6518843

Full Text Available
System design and operation of a 100 kilovolt, 2 kilohertz pulse modulator for plasma source ion implantation

Conference Reass, W

This paper describes the electrical design and operation of a high power modulator system implemented for the Los Alamos Plasma Source Ion Implantation (PSII) facility. To test the viability of the PSII process for various automotive components, the modulator must accept wide variations of load impedance. Components have varying area and composition which must be processed with different plasmas. Additionally, the load impedance may change by large factors during the typical 20 uS pulse, due to plasma displacement currents and sheath growth. As a preliminary design to test the system viability for automotive component implantation, suitable for a manufacturing environment,more »« less
Full Text Available
Initial Design of the 60 Megawatt Rotating Magnetic Field (RMF) Oscillator System for the University of Washington ''TCS'' Field Reversed Configuration Experiment

Conference Reass, W; Miera, D; Wurden, G

This paper presents the initial electrical and mechanical design of two phase-locked 30 Megawatt RMS, 150 kHz oscillator systems used for current drive and plasma sustainment of the ''Translation, Confinement, and Sustainment'' (TCS) field reversed configuration (FRC) plasma. By the application of orthogonally-placed saddle coils on the surface of the glass vacuum vessel, the phase-controlled rotating magnetic field perturbation will induce an electric field in the plasma which should counter the intrinsic ohmic decay of the plasma, and maintain the FRC. Each system utilizes a bank of 6 parallel magnetically beamed ML8618 triodes. These devices are rated at 250 Amperesmore »« less
Full Text Available
Amended proposal for R&D on a cluster klystron

Technical Report Fernow, R; Fischer, J; Gallardo, J; ...

This Proposal is an updated version of FWP submitted in March 1992. Significant work has been done since the original proposal, and much of this is reported on in this update. In addition there have been several changes made, some in response to suggestions made by the three reviews sent to us in December, 1992. The new information and changes include: Technical information on the proposed design of the magnetron gun, the magnet, acceleration gap, and electrical system (including a comment on efficiency loss due to high-voltage leakage current). Modification of the phase I and II tests to allow operationmore »« less
https://doi.org/10.2172/10108654

Full Text Available
Low stored energy 100 kV regulator for ion sources at LANSCE

Conference Jacobson, E; Haffner, R; Ingalls, W; ...

To minimize accelerating column damage caused by uncontrolled energy release during arc-downs, it is desirable to minimize the available stored electrical energy. For the Los Alamos Neutron Science Center (LANSCE) H{sup {minus}} ion sources, the stored energy includes, in addition to the charge in the power supply output capacitance, the charge on the electronics racks. They are supported and insulated from ground by PVC pipe and have a capacitance to ground of approximately 900 pf. In 1988 (LANSCE) personnel designed a high-voltage current source using a low-stored-energy power supply and planar triode with the goal of eliminating uncontrolled release ofmore »« less
Full Text Available

Similar Records