VOLUME 23 • ISSUE 12 • DECEMBER 2021

Happy Holidays!

Searching for 

Durable Moon

Fabrics

Page 2–3

Mini Rovers

Navigate SLOPE

Page 6

 Coins Awarded 

for HEROICS

Page 7
AeroSpace Frontiers

is an official publication of Glenn Research 

Center, National Aeronautics and Space 

Administration. It is published the second 

Friday of each month by the Office of 

Communications in the interest of the 

Glenn workforce, retirees, government 

officials, business leaders, and the general 

public. 

Submit short articles and calendar items 

to the editor at doreen.b.zudell@nasa.gov. 

Editor: Doreen B. Zudell, ATS, 

 216–433–5317

Assistant Editor: Adam Schabel, ATS, 

 216–433–2888

Design: Rhys Sampson, ATS

Managing Editor: Kelly R. DiFrancesco

Circulation: Angela Williams, ATS, 

 216–433–8921

Celebrating the Year

I want to thank you for all that you’ve 

accomplished throughout this past year. I 

am extremely proud of your commitment 

and dedication to advance the NASA 

mission in space and aeronautics. We look 

forward to 2022 with excitement as we 

prepare to make history together in the 

new year with the launch of Artemis I.

Let us also be mindful that this can be a 

difficult time of year for many, so make 

sure to reach out and let them know 

you care. Please continue to follow all 

COVID–19 recommendations during the 

holidays to safeguard your family and 

our workforce. The Employee Assistance 

Program is available to provide support 

and assistance at https://www.grc.nasa.

gov/smad/employee-assistance/. 

Wishing you and your families a very 

happy and safe holiday season!

Ballistic Air Guns,

Mock Moon Rocks

Aid in Search for 

Durable Space Fabrics

The surface of the Moon is a harsh environment with no air, low 

gravity, dust, and micrometeorites—tiny rocks or metal particles—

flying faster than 22,000 mph. These conditions can pose a hazard 

to astronauts, their dwellings, and spacecraft.

Engineers at NASA Glenn’s Ballistic Impact Lab are working to help 

the agency select materials for future Artemis missions and predict 

how they will perform while on the lunar surface.

The innovative lab features a 40-foot-long air gun capable of 

firing at velocities of 3,000 feet per second. It has become a 

go-to destination for NASA as it examines situations ranging from 

the effects of bird collisions with aircraft to ballistic impacts on 

spacecraft.

Now, the team has been called to test several different textiles 

that will protect humans during Artemis missions to the Moon and 

beyond.

“If the object is pressurized, a leak can be catastrophic depending 

on how big and fast the leak is,” said Mike Pereira, Ballistic Impact 

Lab technical lead. “Running this type of ballistic impact test is 

essential to a variety of NASA aeronautics and space exploration 

missions to ensure equipment and materials reliability.”

In the first series of tests, the team evaluated materials NASA is 

considering for habitats, which are designed to be relatively soft 

and flexible, but very stiff if struck.

To assess the potential fabrics and gauge how many layers would 

be needed to stop micrometeorite penetration, engineers used 

DIRECTOR’S

SAFETY CORNER

On the Cover: 

Holiday Flashback - This 2017 photo outside 

the Director’s Office shines brightly with 

holiday spirit. 

GRC-2017-C-09897

Photo by Marvin Smith
the facility’s air gun to fire steel ball bearings at various 

fabrics. The team connected the air gun to a vacuum 

chamber to remove air resistance, allowing it to shoot 

faster, while a suite of sensors and high-speed cameras 

measured how each material absorbed or deflected 

energy.

The resulting impacts take each fabric to the brink of 

failure to better understand the upper limits of durability 

and to ensure each can handle the harsh, punishing 

environment of space exploration.

Other materials tested included spacesuits that could be 

used for extravehicular activities on the lunar surface and 

in orbit. Understanding how materials respond to impacts 

is important for astronaut safety, according to Pereira.

The composite materials were a combination of 

substances that include fibers for strength and bonding 

resins to allow transfer of stress and energy. To evaluate 

these potential materials, engineers used the lab’s 

vertical-impact-drop tester to hurl mock simulated moon 

rocks made of basalt onto potential spacesuit materials.

Engineers at NASA’s Johnson Space Center are analyzing 

the ballistics testing data to determine which materials 

will be best for a variety of lunar exploration items.

The next challenge for the Glenn team is testing materials 

that could capture space debris. New types of aerogels 

that are lighter and stronger might be the key to 

developing and deploying in-space devices given ease of 

use and reduced mass for launch.

By Ellen Bausback

DECEMBER 2021

3

Pereira prepares a vertical-impact-drop tester before a spacesuit materials test.

GRC-2020-C-01110 Photos by Bridget Caswell

Engineers pummeled potential spacesuit materials with mock moon rocks made of basalt like these to see how the fabrics would hold up on the lunar surface.

GRC-2020-C-01123
4

Dr. Barrett

Panel members, from left to right, Méndez, Dr. Pérez-Davis, Deenanauth, and Narvaez-Legeza, emphasize the importance of 

leadership during their discussion.

Dr. Michael J. Barrett has been selected for the Senior Executive Service position of 

director of Space Flight Systems, effective Dec. 5. He has over 30 years of government, 

academe, and industry experience and is recognized nationally and internationally as 

an expert in aerospace flight systems development as well as research and technology 

development.

Barrett previously served as chief of the Power and Propulsion Project Office in the 

Space Flight Systems Directorate and project manager of the Gateway Power and 

Propulsion Element. He earned a Bachelor of Science degree in aeronautical and 

astronautical engineering from Purdue University, and a Master of Science degree and 

Doctor of Philosophy degree in mechanical engineering from the University of Houston. 

Barrett is the recipient of the American Society of Mechanical Engineers Warren M. 

Rohsenow Prize and NASA’s Outstanding Leadership Award.

As part of Glenn’s 80th Anniversary celebration, the center 

held a series of discussions featuring former leaders who 

helped make our center what it is today. Center Director 

Dr. Marla Pérez-Davis concluded the series on Nov. 4.

Pérez-Davis led an open dialogue discussion with Adabelle 

Narvaez-Legeza, Chief Engineer Office; José Méndez, Neil A. 

Armstrong Test Facility; and Andrew Deenanauth, Logistics 

and Technical Information Division, with members of senior 

leadership in the audience in the Administration Building 

Auditorium at Lewis Field. Students and Glenn employees 

watched the presentation online.

Pérez-Davis shared what 

leadership means to her and 

discussed challenges she has 

overcome during her career. 

She also talked about her 

transition from deputy director 

to director, before expressing

her excitement for the Artemis I

mission and the importance 

of advancements in air travel 

and safety. A question-andanswer session with audience 

members followed.

The event concluded with 

a video featuring NASA 

Associate Administrator, Bob Cabana, and former Johnson 

Space Center Director, Dr. Ellen Ochoa, congratulating PérezDavis on being named Engineer of the Year by Great Minds in 

STEM (GMiS). In October, Pérez-Davis was honored as part 

of GMiS’s 33rd Annual Class of Hispanic Engineer National 

Achievement Awards Corporation (HENAAC) winners.

Robyn Gordon, Center Operations Directorate, and Dr. 

Rickey Shyne, Research and Engineering Directorate, led 

a presentation to recognize Pérez-Davis’ achievement in 

receiving the HENAAC award.

By Adam Schabel

Center Selects Director of

Space Flight Systems

Dr. Pérez-Davis Featured in Lessons

From Our Leaders Finale

GRC-2021-C-03765 Photo by Marvin Smith
DECEMBER 2021

5

NASA’s Evolutionary Xenon Thruster—Commercial 

(NEXT–C) will be demonstrated for the first time on the 

Double Asteroid Redirection Test (DART), which launched 

on Nov. 24.

NEXT–C is a powerful next-generation solar electric 

propulsion system that could propel future long-duration 

science missions. The technology was developed at Glenn, 

and the flight hardware was designed and built by Aerojet 

Rocketdyne. The Glenn and Aerojet Rocketdyne team 

conducted vibration, thermal vacuum, and performance 

tests on the flight hardware in Glenn’s Vacuum Facility 6 

in late 2019. The test campaign concluded with engineers 

mating the thruster with its power processing unit for an 

integration test. The environmental testing verified that 

NEXT–C could withstand the extreme launch vibrations and 

temperatures of spaceflight.

DART is a demonstration of technologies for preventing a 

hazardous asteroid from impacting Earth by changing the 

motion of the asteroid in space. DART will be the first space 

mission to demonstrate asteroid deflection by kinetic impact.

Appropriate for a wide range of solar system exploration and 

commercial missions, NEXT–C would enable Discovery, New 

Frontiers, Mars Exploration, and outer-planet missions to 

carry larger payloads and use smaller launch vehicles.

By Adam Schabel

The NEXT–C flight thruster is mounted within a thermal shroud in one of NASA 

Glenn’s vacuum chambers. The thermal shroud subjects the thruster to the 

extreme thermal environments it has been designed to withstand.

Glenn’s NEXT–C Set to Debut 

on DART Mission

GRC-2020-C-00798 Photo by Bridget Caswell

Glenn Connection

DART is powered by Roll-Out Solar Arrays (ROSA). 

ROSA is a highly modular, elastically deployable, 

flexible blanket system for powering commercial, 

civilian, and government spacecraft. ROSA was 

provided by Redwire, with the original technology 

developed by Glenn, the Air Force Research 

Laboratory, and Deployable Space Systems under 

Small Business Innovative Research contracts. 

The technology was advanced by the Glennmanaged Solar Electric Propulsion project. Glenn 

ground tested the technology and supported a 

demonstration on the International Space Station in 

2017. 

DART will also demonstrate Transformational Solar 

Array Technology. Laced within ROSA, these highefficiency solar cells and reflective concentrators 

can provide three times more power than standard 

solar arrays at distances near Jupiter and Saturn. 

The Johns Hopkins University Applied Physics 

Laboratory partnered with three companies to 

develop a Transformational Array under a Glennmanaged research and development program.
6

A CADRE of Mini Rovers Navigate

the Lunar Soils of SLOPE

A squad of mini rovers traversed the simulated lunar soils 

of NASA Glenn’s SLOPE (Simulated Lunar Operations) lab 

recently. The shoebox-sized rovers were tested to see if they 

could navigate the conditions of hard-to-reach places such as 

craters and caves on the Moon. 

NASA’s Cooperative Autonomous Distributed Robotic 

Exploration (CADRE) project is developing small robots 

programmed to work as a team to deploy into environments 

too risky for full-sized rovers. They would explore as a group to 

collect data as well as 3D imagery to map areas of the Moon 

and eventually Mars.

A team of researchers from NASA’s Jet Propulsion Laboratory 

in California worked with SLOPE engineers for a week to see 

if the robots could manage the challenging, fine-grained lunar 

soils. 

“We tested the traction of the wheels in different soils and 

soil conditions,” said Alex Schepelmann, lead roboticist for 

SLOPE. “The rover wheels were also tested to see if they could 

negotiate large lunar rocks and climb the slopes of our tilt beds 

that simulate the hills of the Moon’s surface.”

The SLOPE team also used scientific imaging equipment to 

determine the amount of wheel slip in the soil, which could 

affect the rover’s ability to determine location in its onboard 

computer.

“Since there is no global positioning system (GPS) on the rovers, 

location is determined by wheel rotation,” said Schepelmann. 

“If the wheel slips on the soil, the rover might think it has gone 

farther than it has actually traveled.”

Schepelmann said the spoked wheels on the CADRE robots are 

a mini version of the wheels on the VIPER rover, which will be 

sent to the Moon in 2023 to look for water ice.

The CADRE rovers continue to be developed and tested at JPL. 

CADRE is targeted to fly as a technology demonstration on a 

commercial robotic lander within the next five years via NASA’s 

Commercial Lunar Payload Services (CLPS) Initiative.

By Nancy Smith Kilkenny

NASA Jet Propulsion Lab roboticist Michael Paton works on the 

electronics of a mini rover before testing at Glenn’s SLOPE Lab.

NASA Jet Propulsion Laboratory roboticist 

William Reid sets up an obstacle on SLOPE’s 

tilt bed prior to rover testing.

GRC-2021-C-03896

GRC-2021-C-03895

Photos by Alex Schepelmann
DECEMBER 2021

7

Coins Awarded for Glenn HEROICS

In 2016, Glenn’s Senior Management Team developed 

a set of Glenn core values. These became known as 

Glenn’s 7 Expected Behaviors, or HEROICS: (1) Helping 

All To Succeed, (2) Excellence, (3) Respect, (4) Openness, 

(5) Integrity, (6) Cooperation, and (7) Safety. In 2019, 

senior leadership commissioned a HEROICS Coin to 

recognize employees who embody the spirit of the seven 

HEROICS tenets.

Center Director Dr. Marla Pérez-Davis is proud to 

recognize the employees who received Glenn’s HEROICS 

Coins in 2021:

Scott Broemsen, Office of the Director, for your support 

to the successful NASA Glenn Neil A. Armstrong Test 

Facility renaming ceremony on Aug. 12. Your efforts 

as the Glenn Legislative Affairs Officer, assisting in the 

overall planning for the event, were extremely valuable. 

Lauren M. Demirjian, NASA Office of the Chief Human 

Capital Officer, for your outstanding leadership and 

contributions to enabling Glenn to successfully, and in a 

timely manner, address executive staffing, training, and 

development needs.

Seth Harbaugh, Center Operations Directorate, for 

your support to NASA Glenn’s COVID–19 response and 

to the Return to Onsite Work efforts. Your hard work 

and efforts in coordinating and leading several crossorganization teams ensured continued safety and health 

and streamlined the onboarding of backlogged services 

at the center.

Jay W. Jackson, Office of the General Counsel, for your 

leadership to the NASA Glenn Return to Onsite Work 

Stage 2 coordination during the COVID–19 pandemic. 

For your efforts in spearheading the formulation and 

development of the NASA Glenn Stage 2 plan. 

Luz Jeziorowski, Safety and Health Division, for the 

many hours you worked to maintain COVID–19 data. 

This enabled center leadership to be continuously 

updated, demonstrating your commitment to the safety 

of our employees.

Christie J. Myers, Environmental Management Office, 

for your support during the Fiscal Year 2021 Glenn 

Environmental Management System audit.

Bryan Smith, Facilities, Test and Manufacturing 

Directorate, for your support to NASA Glenn’s Return 

to Onsite Work efforts. Your collaborations across 

organizations allowed for the completion of mission 

critical work.

GLENN RESEARCH CENTER

Lewis Field · Neil A. Armstrong Test Facility
8

NEWS AND EVENTS

Visit Strengthens Ties With Cybersecurity 

and Infrastructure Security Agency

Nitin Natarajan, deputy director for the Department of Homeland Security’s Cybersecurity and Infrastructure 

Security Agency (CISA), visited Lewis Field on Oct. 14. Glenn Associate Director Larry Sivic provided a center 

overview and accompanied Natarajan and several members of his staff on facility tours. The group viewed 

the Icing Research Tunnel and the Zero Gravity Research Facility. They discussed cybersecurity aspects of 

operational technology and critical infrastructure relative to Glenn’s varied missions. 

Natarajan (front, right) and staff join members of Glenn’s workforce in the 

Zero Gravity Research Facility. 

GRC-2021-C-03456 Photo by Marvin Smith

Glenn’s Space Communications and Navigation (SCaN) Wideband 

User Terminal project team earned the International Communications 

Satellite Systems Conference (ICSSC) best paper at the joint 26th Ka 

and Broadband Communications Conference and 38th ICSSC. The 

paper, “Development and Demonstration of a Wideband RF User 

Terminal for Roaming between Ka-band Relay Satellite Networks,” 

was co-authored by Glenn’s Marie Piasecki, Joseph Downey, Nang 

Pham, James Nessel, Adam Gannon, Daniel Zeleznikar, and Mick Koch. 

Glenn’s Wideband Project has developed a user terminal that allows 

for network roaming in space, advancing space communications 

interoperability for future NASA near-Earth missions.

SCaN Team Wins Best Paper
DECEMBER 2021

9

Have You Chosen Your CFC Charity? 

The 2021 Combined Federal Campaign (CFC) is well 

underway. Have you made your pledge and chosen 

your charity? Several charities were highlighted during 

Glenn’s CFC virtual Agency Fair on Nov. 10. Glenn’s 

campaign runs through Jan. 15, 2022, with the goal 

of raising $275,000. 

For more information, visit Glenn’s CFC page at 

https://www.grc.nasa.gov/cfc/.

For a list of charities, download https://ohiocfc.

givecfc.org/sites/cfczone28/files/2021-09/2021%20

Charity%20Listing%20Ohio-508.pdf. 

Trea Kiser, Special Olympics Ohio, was one of several charities 

highlighted during the agency fair. 

GRC-2021-C-03870 Photo by Bridget Caswell

NASA Accepts Nuclear Lifetime 

Achievement Award

Glaze (left) accepts a Lifetime Achievement Award from Walther. 

GRC-2021-CN-00065 Photo by NASA/Aubrey Gemignani 

Lori Glaze, director of NASA’s Planetary Science 

Division, accepted a Lifetime Achievement Award on 

behalf of NASA at The Observatory at the America’s 

Square on Oct. 19 during the opening ceremony for 

Nuclear Science Week.

National Museum of Nuclear Science and History 

Director Jim Walther honored NASA and the 

Department of Energy with the 2021 Nuclear Lifetime 

Achievement Award for their work in nuclear science, 

space exploration, and discovery.

Glaze remarked on the successful partnership 

between NASA and the Department of Energy that 

has enabled more than 25 space science missions to 

carry nuclear power systems.

As the scientific community continues to benefit from these missions, NASA is building on the success of nuclear in 

space and investing in new technology to enable a robust human presence on the Moon and eventually human 

missions to Mars.

This June marked 60 years since the launch of the United States’ first nuclear-powered spacecraft, Transit IV–A. Glenn 

has played a vital role in nuclear power technology. To find out more about our center’s role, visit https://go.nasa.

gov/3HJOOBJ.
10

Robert Romanofsky, Communications and Intelligent Systems Division, Research and Engineering Directorate, 

retired Nov. 30, 2021, with 38 years of NASA service. 

Retirements

Romanofsky

More Than a Memory

Antl

Robert J. Antl, 87, a 1989 retiree with 32 years of NASA service, died Oct. 9. He worked on small rocket 

engines and participated in testing of the RL–10 engine for Centaur. Antl also studied inlet distortion in jet 

engines, helped calibrate the General Electric J–85, and contributed to the Engine Component Improvement 

(ECI) and Advanced Turboprop programs. He received a Group Achievement Award (1980) for contributions 

involving the ECI project.

Truskot’s Attention to Detail Contributed to 

Project Success

Truskot

Floyd J. Truskot, 59, an engineering technician in the Space Environments Test Branch, died Oct. 5.

Truskot began his career at NASA Lewis as an electrical draftsman after graduating from Lorain County 

Community College in 1992 with an associate degree in Engineering Technology. He supported many 

projects throughout his 29 years at the center. Truskot’s attention to detail led to requests for his assistance 

on technical projects where he provided drafting services. He was a member of Glenn’s Disability 

Awareness Advisory Group. 

“Those who worked closely with Floyd described him as a gentleman who was always very professional 

and thorough,” said Shelly Doehne, Truskot’s supervisor. “He was proud of NASA and his opportunity to 

work for the agency.”

Congratulations to the 2021 

Golden Shoe Recipient! 

Glenn’s Human Resources Office has earned the 2021 Golden Shoe Award for its 

participation in the Virtual Health Walk. Safety and Mission Assurance Directorate 

(SMAD) took second place, while the Office of the Chief Financial Officer finished 

third. The activity was part of the SMAD’s Safety and Health Awareness event in

September. Thanks to everyone who stepped out, got in some exercise, and enjoyed 

the competition!

GRC-2021-C-03848
DECEMBER 2021

NASA Glenn Employees: For more calendar information, visit https://wing.grc.nasa.gov/event-calendar/. 11

Deadline for the next calendar

section is Wednesday, Dec. 15,

noon. News and feature stories 

require additional time.

Glenn’s Library will continue hosting its 

popular Information Café series in 2022. 

Mark your calendar for Wednesday, 

Jan. 19, from 11–11:45 a.m., for the first 

session of the new year. Topic to come. 

Check Today@Glenn for the link. 

POC: robin.n.pertz@nasa.gov

INFORMATION CAFÉ

Emergency Management Office staff 

will conduct an audible siren test on 

the “tornado” tone on Saturday,

Jan. 1, at Lewis Field. A mass 

notification voice test at building 3 will 

be conducted on Wednesday, Jan. 5.

POC: allen.r.turner@nasa.gov

OUTDOOR SIREN TESTING

The College Now Mentoring Program 

connects college mentors and students 

online, where they stay in touch with 

two emails per month and three virtual 

meetings per year. The time commitment 

is minimal (an average of 2 hours per 

month), and the program is life changing. 

A virtual information session will be 

held on Jan. 12 at noon with College 

Now staff and NASA colleagues who are 

mentoring. 

POC: jeresha.n.nixon@nasa.gov

COLLEGE NOW MENTORING

Glenn’s Office of STEM Engagement 

is partnering with Big Brothers/Big 

Sisters of Greater Cleveland (BBBSGC) 

in support of their mission to create 

and support one-on-one mentoring 

relationships. BBBSGC is seeking 

responsible adults to serve as volunteers 

to youth, ages 7–15. All training and 

program enrollment is being done 

virtually, but mentors are doing in-person 

activities with mentees. Mentors meet 

with mentees 2–4 times a month. More 

information is available online at 

www.bbbscle.org. 

POC: jeresha.n.nixon@nasa.gov

BIG BROTHERS/BIG SISTERS MENTORING

Why the Moon? 

Do You Know This Person?

Glenn’s Logistics and Technical Information Division 

needs your help identifying people, places, and 

research from archived images. If you recognize a 

photo placed here, email GRC-ITC@mail.nasa.gov.

To ensure your email reaches the right individuals, 

please enter “DYKTP” into the subject line. 

Although we cannot respond to individual emails, 

please know your participation is appreciated!

GRC–1990–C–03592

Attention Employees and Retirees

NASA’s new Why the Moon video showcases the agency’s broad 

and collective work to advance Artemis. The video features 

Glenn’s contributions and an appearance by Dr. Dionne 

Hernandez-Lugo. The video debuted at the 36th Space 

Symposium, and was subsequently shared with 

national and international audiences on the 

agency’s social media channels.

https://www.youtube.com/watch?v=

bmC-FwibsZg&t=5s

2021 

for this virtual event 

MONDA Y 

December 13, 2021 

12 TO 2 P.M. 

See Today@Glenn for more information 

Join us 

Holiday Virtual Town Hall 
National Aeronautics and 

Space Administration

John H. Glenn Research Center 

Lewis Field

21000 Brookpark Road 

Cleveland, Ohio 44135

Neil A. Armstrong Test Facility

3597 E. Scheid Road

Sandusky, Ohio 44870

www.nasa.gov

Read AeroSpace Frontiers online at https://www.nasa.gov/glenn/aerospacefrontiers.

Emergency and Inclement Weather Lines 

Lewis Field: 216–433–9328 (WEAT) 

Neil A. Armstrong Test Facility: 419–621–3333

Connect With Glenn

Glenn’s Small Spacecraft Electric 

Propulsion (SSEP) System was 

named a finalist for the 2021 R&D 

100 Award. 

The R&D 100 Awards have served 

as the most prestigious innovation 

awards program for the past 58 

years, honoring great research and 

development pioneers and their 

revolutionary ideas in science and 

technology. 

The SSEP System is a highperformance sub-kilowatt Halleffect thruster and power processing 

unit that revolutionizes the capability 

of low-cost small spacecraft to 

achieve more ambitious missions 

throughout the solar system. This 

technology offers exceptional 

improvements in thrust, efficiency, and lifetime compared to the state-of-the-art electric propulsion technologies. 

SSEP Systems have applications in aerospace for the propulsion system, intended for small spacecraft using Hall 

effect thrusters. Commercial space-related applications include station keeping, orbit raising, spacecraft servicing, and 

missions beyond Low Earth Orbit/Geosynchronous Equatorial Orbit.

Congratulations to the SSEP team, consisting of researchers and engineers across four different branches in Glenn’s 

Research and Engineering Directorate. They include Matthew Baird, Gabriel Benavides, Randy Clapper, Ariel 

Dimston, Timothy Gray, Thomas Haag, Scott Hall, David Jacobson, Hani Kamhawi, Thomas Liu, Jonathan 

Mackey, James Myers, Luis Piñero, Corey Rhodes, Timothy Sarver-Verhey, and John Yim.

For a full list of the 2021 finalists, visit https://www.rdworldonline.com/finalists-for-2021-rd-100-awards-are-unveiled/.

NASA Glenn Named Finalist for

2021 R&D 100 Award

Rhodes (left) and Liu stand in front of Vacuum Facility 8 preparing the

H71M-PM Hall-effect thruster for testing.

GRC-2020-C-03459 Photo by Jef Janis