What happened to NASA's tractor beam?

Eight years ago, I posted a link about NASA entering into a partnership with Arx Pax, inventor of hover engine technology, to develop a tractor beam, which have been a part of science fiction for decades.  It seemed as if it was to become reality.  I wanted to see how far they have come along, but the original link I posted to Arx Pax's website does not work any more. A search of NASA's website yields no results for 'Arx Pax'. 

NASA is now starting a program Planetary Defense Strategy and Action Plan, to deal with the threat of near Earth objects (NEO).  The program includes tasks for identifying NEOs and determining which ones might pose a danger to Earth.  Its Double Asteroid Redirection Test (DART) last year demonstrated that NASA can alter the trajectory of an asteroid.  They plan to develop 'gravity tractors' but I haven't been able to find any research on this.

I did find an article on-line about a group at University of Colorado at Boulder that is working on a tractor beam in an effort to clean up space debris.  There is a lot of space junk in orbit up there and collisions create more junk.  They are basing their research on the Coulombe force, where objects of opposite charges attract each other, and objects with the same charge repel each other.  

Read more about their research below:

https://www.universetoday.com/161783/researchers-are-working-on-a-tractor-beam-system-for-space/

NASA confirms DART Mission Successful!

A little over two weeks ago, NASA's Double Asteroid Redirection Test (DART) impacted Dimorphos, a small asteroid moon of the larger asteroid Didymos, in an attempt to deflect its orbit.  Yesterday, NASA confirmed that the impact changed Dimorphos's orbit from 11 h 55 min to 11 h 23 min, a total of 32 minutes.  The director of NASA said the result of the impact slowed Dimorphos's orbit, but NASA press release states that its orbit has been shortened, i.e. faster.

This confirms that NASA has the ability to change the course of an asteroid should one threaten Earth in the future.  act 

NASA's DART's Impacts with asteroid Dimorphos

Yesterday evening, September 26, 2022, NASA successfully crashed its Double Asteroid Redirection Test (DART) with Dimorphos, a moon of the minor-planet asteroid Didymos. The test is designed to determine if a spacecraft can deflect an asteroid via a transfer of momentum, as part of a planetary defense against near-Earth objects.  Dimorphos was chosen since it does not pose a threat to Earth. 

The project began as a collaboration between NASA and ESA, named Asteroid Impact and Deflection Assessment (AIDA) involving two separate spacecraft.  The ESA spacecraft AIM was to have launched in December 2020 but the project was cancelled.  It has been replaced by Hera to study the results of DART's impact on Dimorphos. Hera is expected to arrive in the Didymos system in 2026.

Dimorphos has a diameter of about 560 feet and was discovered in 2003.