Att_A_-_SOW.pdf

NNC16CA19C ATTACHMENT A JHU / APL

STATEMENT OF WORK

TRANSFORMATIONAL SOLAR ARRAY FOR EXTREME ENVIRONMENTS

1.0 Introduction/Background

This project is to develop very high performance solar array technology for use in extreme environments typically exemplified by trajectories to and orbiting Jupiter. The environments are low temperature, about -125 °C; low irradiance, about 50 W per square meter, and high charged particle density. The project array is also intended to develop very high performance solar array technology in Earth orbit. This statement of work is the result of a proposal submitted by the Johns Hopkins University Applied Physics Laboratory (JHUAPL) for award under the NASA Headquarters Space Technology Mission Directorate (STMD) NASA Research Announcement (NRA) entitled “Space Technology Research, Development, Demonstration, and Infusion” – 2015, Appendix NNH15ZOA001N-15GCD-C3.

2.0 Scope of Work

The scope of this project is to design and demonstrate at TRL-5 a Transformational Solar Array over three successive phases (Base, Option I, and Option II) with the following goals:

• Over 47% Beginning of Life cell efficiency at 5 AU and -125 °C

• Over 32% End of Life efficiency at the blanket level at 50 W m-2, -125 °C and 4E15 1 MeV e cm-2

• Over 8 W kg-1 at EOL for the entire array including structure and deployment mechanisms

• A stowed packaging density of 60 kW m-3 computed at BOL for 1,345 W m-2

• An ability to survive launch and numerous deploy retract cycles without degradation

• An output higher than 300 V

• An ability to operate in a plasma generated a by xenon thrusters, typically 1E8 cm-3 ions with an average energy of 2eV

• A design compatible with electrostatic and magnetic cleanliness

• Solar cells that have no anomalous flat spot behavior at low irradiance and low temperature

• A design compatible with electrostatic and magnetic cleanliness

• Record breaking IMM6 solar cells

• A mock-up production line for the inexpensive manufacture of spacecraft blanket arrays

3.0 Applicable Documents/Background

AIAA Standard S-112, Qualification and Quality Requirements for Electrical Components on Space Solar Panels

4.0 Description of Contract/Technical Requirements:

4.1 Base: System Design, Component Test and Analysis

• Describe IMM cells, fabrication techniques, and previous work on surviving stowage/launch and operating at >330V

• 35% BOL Goal

- Calculate IMM efficiency at 5 AU and -125 C.

- Define plan to eliminate LILT, fabricate and test IMM cells at LILT to be certain to show they harmful LILT, and test cells at LILT before and after 4.5E15 1 MeV e

• 28% at Blanket

- Fabricate IMM SCAs for outgassing tests with DC93-500 and low outgas adhesive and optimized quantity of microspheres

- Measure and reduce outgassing of SCAs made with ultra-low outgassing adhesive filled with microspheres

• Fabricate best outgassing SCAs for DSS blanket samples and test at APL

• Report IMM solar cell mass and power at 5 AU and EOL

• Report power and packaging density for 5 kW, 50 KW and 100 kW

• Describe deployment design and mechanism

• Design magnetically and electrostatically clean array

• Document reduction in cost and cell inspection

4.2 Option I: Test Hardware

• 35% BOL Goal

- Eliminate LILT phenomenon in IMM5 solar cells

- Fabricate sample IMM5 cells and test at LILT to be sure harmful LILT phenomenon are cured

- Test sample of IMM5 cells to be sure that harmful LILT is gone at EOL, 50 W per square meter, -125 C, and 4E15 1 MeV e per square centimeter.

• 28% at Blanket

- Refine concentrator coating, eliminate delamination, evaluate ultra-low outgassing adhesive for back of wing

- Manufacture sufficient IMM5 SCA strings for two NASA150mm x 150mm blankets

- Manufacture two 150mm x 150mm blankets with back-wiring and ultralow outgassing cell to substrate adhesives

- Estimate expected array mass and performance at BOL

- Functionally test and expose a blanket to environments

- Evaluate array performance: update models, assess performance, assess TRL, and assess blanket efficiency at EOSo Refine outgassing control by manufacturing IMM SCAs and testing for outgassing

• Update Base Phase for 8 to 10 W per kilogram goal

• Update Base Phase for packaging density >60W per cubic meter goal

• Test for damage in Xenon Plasma at NASA/GRC

• Demonstrate Technology can survive stowage and launch

• Update Base Phase operation at >800V and damage in Xenon plasma

• Implement magnetically and electrostatically clean design on prototype blankets

• Optimize production for reduced costs and cell inspection

4.3 Option II:

• Status progress on 35% BOL Goal

- Eliminate LILT phenomenon in IMM6 solar cells

- Fabricate sample IMM6 cells and test at LILT to be sure harmful LILT phenomenon are cured

- Test sample of IMM6 cells to be sure that harmful LILT is gone at EOL, 50 W per square meter, -125 C, and 4E15 1 MeV e per square centimeter.

• 28% at blanket and demonstrate stowage and deployment

- Fabricate sufficient IMM string for 0.5m x 1m blanket prototypes

- Fabricate blankets with back-wiring and integrate to manual deployment mechanism

- Asses blanket performance against figures of merit and key performance parameters

- Qualify blanket to S-112: Acoustic, Electrostatic Discharge, UV Exposure, Thermal

Vacuum Exposure, Thermal Cycling, Output as a function of angle, Solar Cell Assembly Characterization

- Re-evaluate TRL and power density for 8 to 10 W per kilogram and >60W per cubic meter

- Test blanket operation to >300 V in Xenon Plasma at NASA/GRC

• Evaluate magnetically and electrostatically clean array

• Mock-up production line for reduced costs

5.0 Program Schedule/Milestones:

5.1 Base: System Design, Component Test and Analysis

The detailed Base phase schedule in the APL proposal for Transformational Solar Array serves as the overall program schedule and specifically includes:

• Project Initiation/Technical Coordination Meeting at NASA Glenn Research Center (GRC), 4 weeks after award

• Status Reporting Telecon, every 3 months

• Virtual (no travel) Technical Interchange Meeting, 4 months after award

• Final Oral Presentation at JHUAPL, 9 months after award

5.2 Option I: Test Hardware - The detailed Option I phase schedule in the APL proposal for Transformational Solar Array serves as the overall program schedule and specifically includes:

• Project Initiation/Technical Coordination Meeting at NASA GRC, 4 weeks after award

• Status Reporting Telecon, every 3 months

• Detailed Design Review, 6 months after award

• Final Oral Presentation at JHUAPL, 12 months after award

5.3 Option II: Scalable System Hardware

The detailed Option II phase schedule in the APL proposal for Transformational Solar Array serves as the overall program schedule and specifically includes:

• Project Initiation/Technical Coordination Meeting at NASA GRC, 4 weeks after award

• Status Reporting Telecon, every 3 months

• Detailed Design Review, 6 months after award

• Final Oral Presentation at APL, 15 months after award

6.0 Guidance of the Government

In conducting this contract, APL shall act under the guidance and at the behest of the government, and make technical recommendations to the government who makes the acceptance on the contract deliverables and subsequent procurement decisions. APL shall have a continuing obligation to inform the government of known problems and issues in development and deployment of systems, and make disclosure of known risks associated with the system’s performance and with any of the other activities to be conducted under this contract. Deliverables and recommendations shall be provided for government review and approval and provided only for the environments and specified conditions for which they were intended and/or tested. All efforts under this contract shall be conducted in accordance with established Laboratory quality assurance procedures.

7.0 Deliverables:

7.1 Base: System Design, Component Test and Analysis

• Minutes from Project Initiation/Technical Coordination Meeting, 1 week after meeting

• Status reports including fund balance, achievements and test data, every 3 months

• Minutes from Technical Interchange Meeting, 1 week after meeting

• Draft Final Report, 8 months after award

• Presentation material for Oral Presentation, 2 weeks prior to review

• Minutes from oral presentation, 1 week after presentation

• Final Report including empirical data demonstrating current TRL and evidence documenting feasibility to TRL 5 during Option I, 9 months after award

• Financial deliverables per contract requirements

7.2 Option I: Test Hardware

• Minutes from Technical Interchange Meeting, 4 months after award

• Presentation material for detailed Design Review, 2 weeks prior to review

• Minutes from detailed Design Review, 1 week after review

• Draft Final Report including component test data, analytical models, and system concept, 11 months after award

• Deliver Transformational Solar Array Test article sized to 15 cm x 15 cm, 12 months after award

• Presentation material for Oral Presentation, 2 weeks prior to review

• Minutes from Oral Presentation, 1 week after presentation

• Final Report including empirical data demonstrating current TRL and evidence documenting feasibility to TRL 5 during Option I, 12 months after award

• Financial deliverables per contract requirements

7.3 Option II: Scalable System Hardware

• Presentation material for detailed Design Review, 2 weeks prior to review

• Minutes from detailed Design Review, 1 week after review

• Deliver Transformational Solar Array Test article (1.0 m by 0.5 m blanket with storage canister), 15 months after award

• Presentation material for Oral Presentation, 2 weeks prior to review

• Minutes from Oral Presentation, 1 week after presentation

• Final Report including empirical data demonstrating current TRL and evidence documenting feasibility to TRL 5 during Option I, 15 months