Joel Galofaro - Academia.edu (original) (raw)

Uploads

Papers by Joel Galofaro

Research paper thumbnail of Experimental Study of Solar Array-Plasma Interaction

Bookmarks Related papers MentionsView impact

Research paper thumbnail of High Voltage Space Solar Arrays

Iaf Abstracts 34th Cospar Scientific Assembly, 2002

Recent tests performed at the NASA Glenn Research Center and elsewhere have shown promise in the ... more Recent tests performed at the NASA Glenn Research Center and elsewhere have shown promise in the design and construction of high voltage (300-1000 V) solar arrays for space applications. Preliminary results and implications for solar array design will be discussed, with application to direct-drive electric propulsion and space solar power.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of New Voltage and Current Thresholds Determined for Sustained Space Plasma Arcing

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Solar Array in Simulated LEO Plasma Environment

Bookmarks Related papers MentionsView impact

Research paper thumbnail of On-Orbit Daytime Solar Heating Effects: A Comparison of Ground Chamber Arcing Results

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Ground Based Experimental Results of Thin-Film Photovoltaic Cells in a Low Density LEO Plasma Environment

2006 IEEE 4th World Conference on Photovoltaic Energy Conference, 2006

Plasma ground testing results, conducted at the Glenn Research Center (GRC) National Plasma Inter... more Plasma ground testing results, conducted at the Glenn Research Center (GRC) National Plasma Interaction (N-Pl) Facility, are presented for a number of thin-film photovoltaic cells. The cells represent a mix of promising new technologies identified by the Air Force Research Laboratory (NFRL) under the CYGNUS Space Science Technology Experiment (SSTE-4) Program. Measurements of parasitic current loss, charging/dielectric breakdown of cover-slide coatings and arcing threshold tests are performed for each individual cell. These measurements are followed by a series of experiments designed to test for catastrophic arc failure mechanisms. A special type of power supply, called a solar array simulator (SAS) with adjustable voltage and current limits on the supply's output, is employed to bias two adjacent cells at a predetermined voltage and current. The bias voltage is incrementally ramped up until a sustained arc results. Sustained arcs are precursors to catastrophic arc failure were the arc current rises to a maximum value for long timescales (often ranging between 30 to 100 microsecond times). Normal arcs by comparison, are short lived events with a timescale between 10 and 30 microseconds). Sustained arcs lead to pyrol with extreme cell damage and have been shown to cause the loss of entire array strings in solar arrays. The collected data will be used to evaluate the suitability of thin-film photovoltaic technologies for future space operations

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Ground Tests of High-Voltage Solar Arrays Immersed in a Low Density Plasma

34th AIAA Plasmadynamics and Lasers Conference, 2003

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Arcing on Solar Arrays at Extremely Low Temperatures

48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, 2010

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Effect of Solar Array Size on Sustained Arc Inception

47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition, 2009

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Experimental Tests of UltraFlex Array Designs in Low Earth Orbital and Geosynchronous Charging Environments

1st AIAA Atmospheric and Space Environments Conference, 2009

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Neutral Gas Desorption and Breakdown on a Metal-Dielectric Junction Immersed in a Plasma

33rd Plasmadynamics and Lasers Conference, 2002

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Arcing in LEO - Does the Whole Array Discharge?

43rd AIAA Aerospace Sciences Meeting and Exhibit, 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Comparative Analysis of Arcing in LEO and GEO Simulated Environments

45th AIAA Aerospace Sciences Meeting and Exhibit, 2007

... Home > 연구문헌정보 > Journal & Proceedings. 코드, AIAA-2007-0093. 문헌분류, 학술발표대회. 제목, Compar... more ... Home > 연구문헌정보 > Journal & Proceedings. 코드, AIAA-2007-0093. 문헌분류, 학술발표대회. 제목, Comparative Analysis of Arcing in LEO and GEO Simulated Environments. ... Arc current pulse wave forms are also essentially different in these environments. ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of SOLAR ARRAY ARCING IN LEO: How Much Charge is Discharged?

Space Technology Proceedings, 2006

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The electrostatic breakdown on a metal-dielectric junction immersed in a plasma

20th International Symposium on Discharges and Electrical Insulation in Vacuum, 2002

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Array arcing in orbit - From LEO to GEO

37th Aerospace Sciences Meeting and Exhibit, 1999

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Emission Spectra of Plasmas Generated by Arcs on Solar Array Surface

39th Plasmadynamics and Lasers Conference, 2008

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Solar Array in Dense Plume Plasma

37th AIAA Plasmadynamics and Lasers Conference, 2006

Bookmarks Related papers MentionsView impact

Research paper thumbnail of High Power Electric Propulsion Discharge Characteristics: Vacuum Facility Ground Testing

38th Plasmadynamics and Lasers Conference, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Far Field Plasma Parameters of 20 kW Plasma Thruster

38th Plasmadynamics and Lasers Conference, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Experimental Study of Solar Array-Plasma Interaction

Bookmarks Related papers MentionsView impact

Research paper thumbnail of High Voltage Space Solar Arrays

Iaf Abstracts 34th Cospar Scientific Assembly, 2002

Recent tests performed at the NASA Glenn Research Center and elsewhere have shown promise in the ... more Recent tests performed at the NASA Glenn Research Center and elsewhere have shown promise in the design and construction of high voltage (300-1000 V) solar arrays for space applications. Preliminary results and implications for solar array design will be discussed, with application to direct-drive electric propulsion and space solar power.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of New Voltage and Current Thresholds Determined for Sustained Space Plasma Arcing

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Solar Array in Simulated LEO Plasma Environment

Bookmarks Related papers MentionsView impact

Research paper thumbnail of On-Orbit Daytime Solar Heating Effects: A Comparison of Ground Chamber Arcing Results

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Ground Based Experimental Results of Thin-Film Photovoltaic Cells in a Low Density LEO Plasma Environment

2006 IEEE 4th World Conference on Photovoltaic Energy Conference, 2006

Plasma ground testing results, conducted at the Glenn Research Center (GRC) National Plasma Inter... more Plasma ground testing results, conducted at the Glenn Research Center (GRC) National Plasma Interaction (N-Pl) Facility, are presented for a number of thin-film photovoltaic cells. The cells represent a mix of promising new technologies identified by the Air Force Research Laboratory (NFRL) under the CYGNUS Space Science Technology Experiment (SSTE-4) Program. Measurements of parasitic current loss, charging/dielectric breakdown of cover-slide coatings and arcing threshold tests are performed for each individual cell. These measurements are followed by a series of experiments designed to test for catastrophic arc failure mechanisms. A special type of power supply, called a solar array simulator (SAS) with adjustable voltage and current limits on the supply's output, is employed to bias two adjacent cells at a predetermined voltage and current. The bias voltage is incrementally ramped up until a sustained arc results. Sustained arcs are precursors to catastrophic arc failure were the arc current rises to a maximum value for long timescales (often ranging between 30 to 100 microsecond times). Normal arcs by comparison, are short lived events with a timescale between 10 and 30 microseconds). Sustained arcs lead to pyrol with extreme cell damage and have been shown to cause the loss of entire array strings in solar arrays. The collected data will be used to evaluate the suitability of thin-film photovoltaic technologies for future space operations

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Ground Tests of High-Voltage Solar Arrays Immersed in a Low Density Plasma

34th AIAA Plasmadynamics and Lasers Conference, 2003

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Arcing on Solar Arrays at Extremely Low Temperatures

48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, 2010

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Effect of Solar Array Size on Sustained Arc Inception

47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition, 2009

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Experimental Tests of UltraFlex Array Designs in Low Earth Orbital and Geosynchronous Charging Environments

1st AIAA Atmospheric and Space Environments Conference, 2009

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Neutral Gas Desorption and Breakdown on a Metal-Dielectric Junction Immersed in a Plasma

33rd Plasmadynamics and Lasers Conference, 2002

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Arcing in LEO - Does the Whole Array Discharge?

43rd AIAA Aerospace Sciences Meeting and Exhibit, 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Comparative Analysis of Arcing in LEO and GEO Simulated Environments

45th AIAA Aerospace Sciences Meeting and Exhibit, 2007

... Home > 연구문헌정보 > Journal & Proceedings. 코드, AIAA-2007-0093. 문헌분류, 학술발표대회. 제목, Compar... more ... Home > 연구문헌정보 > Journal & Proceedings. 코드, AIAA-2007-0093. 문헌분류, 학술발표대회. 제목, Comparative Analysis of Arcing in LEO and GEO Simulated Environments. ... Arc current pulse wave forms are also essentially different in these environments. ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of SOLAR ARRAY ARCING IN LEO: How Much Charge is Discharged?

Space Technology Proceedings, 2006

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The electrostatic breakdown on a metal-dielectric junction immersed in a plasma

20th International Symposium on Discharges and Electrical Insulation in Vacuum, 2002

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Array arcing in orbit - From LEO to GEO

37th Aerospace Sciences Meeting and Exhibit, 1999

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Emission Spectra of Plasmas Generated by Arcs on Solar Array Surface

39th Plasmadynamics and Lasers Conference, 2008

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Solar Array in Dense Plume Plasma

37th AIAA Plasmadynamics and Lasers Conference, 2006

Bookmarks Related papers MentionsView impact

Research paper thumbnail of High Power Electric Propulsion Discharge Characteristics: Vacuum Facility Ground Testing

38th Plasmadynamics and Lasers Conference, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Far Field Plasma Parameters of 20 kW Plasma Thruster

38th Plasmadynamics and Lasers Conference, 2007

Bookmarks Related papers MentionsView impact

Log In