Errymath: HEP-100MF thruster

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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhdG44EiWQifjQ7Co6uwic3dz0wk39bSlznKKV685iCxWv859rs0MGseCcZPTHvCLOZOz6D5wdduxJLh2PLeeDil_92-kE43dvZnAFylFG6Qa40GrT-oPE4awz9ywfYXQwCVIix8VP13ZE/s1600/The+Shijian-17+satellite%252C+loaded+with+the+HEP-100MF+thruster%252C+is+launched+by+a+Long+March+5+rocket+in+the+Wenchang+Satellite+Launch+Center+in+Hainan+province+on+Nov.+3.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="425" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhdG44EiWQifjQ7Co6uwic3dz0wk39bSlznKKV685iCxWv859rs0MGseCcZPTHvCLOZOz6D5wdduxJLh2PLeeDil_92-kE43dvZnAFylFG6Qa40GrT-oPE4awz9ywfYXQwCVIix8VP13ZE/s640/The+Shijian-17+satellite%252C+loaded+with+the+HEP-100MF+thruster%252C+is+launched+by+a+Long+March+5+rocket+in+the+Wenchang+Satellite+Launch+Center+in+Hainan+province+on+Nov.+3.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">The Shijian-17 satellite, loaded with the HEP-100MF thruster, is 
launched by a Long March 5 rocket in the Wenchang Satellite Launch 
Center in Hainan province on Nov. 3</td></tr>
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<a href="http://www.caixinglobal.com/2016-12-26/101030621.html" target="_blank">By Yu Dawei and Teng Jing Xuan</a></div>
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A unique thruster mounted on a recently 
launched satellite has given China's space program an edge over 
international rivals and opened a door to deep-space exploration. 
 
The HEP-100MF thruster, jointly developed by research teams from the 
Harbin Institute of Technology (H.I.T.) and the China Academy of Space 
Technology's (CAST) Institute 502, successfully debuted Nov. 22 aboard 
an orbiting Shijian-17 satellite. The satellite was launched Nov. 3 by a
 Long March 5 rocket. 
 
"The thruster ignited successfully in geosynchronous orbit," the H.I.T. 
announced. The ignition "marks the first application of magnetic-focus 
(HEP-100MF) in space. 
 
The HEP-100MF propulsion system relies on a magnetic field to convert and control the propellant — a plume of charged ion particles — that generates the thrust needed at times to stabilize the orbiting Shijian-17. 
 
A system that relies on magnetic-focus, ion plume propulsion is less 
likely to damage a thruster's mechanism than other propulsion systems, 
scientists say. It's also considered more efficient than traditional 
chemical-propulsion thrusters. 
 
Chemical fuel propelled the powerful Saturn V rockets that helped the 
U.S. space program put men on the moon from 1969-72. But the Saturn V's 
first-stage engines burned out in less than three minutes, scientists 
say, and most of the rocket's fuel was used to propel its own weight. 
 
   
After the engines on a Saturn V rocket burned out, the rocket's payload 
went into "space glide" mode, using inertia and gravity's pull to hurdle
 toward a destination. But additional thrust is needed to propel a 
gliding spacecraft beyond the solar system and into deep space. 
  
Chemical propulsion systems have been commonly deployed for years to 
stabilize communications satellites, which require constant adjusting 
while in orbit. Sooner or later, though, these thrusters run out of 
fuel. 
 
The HEP-100MF might be used for deep-space missions because it's 
designed for longevity. The thruster "can be applied to space station, 
deep space exploration (and) high- and low-orbit Earth satellite orbit 
control," the H.I.T. said. 
 
China has not announced plans for a deep-space mission, but the nation's
 space program has been expanding rapidly. Recent developments include 
new rockets and the launching of a manned space station. 
 
Hunting for Thrust

The HEP-100MF is based on so-called "Hall-effect thruster" technology, 
which has been tested on the ground by researchers at American, Russian,
 European Union and Japanese space agencies. 
 
But China's thruster aboard the Shijian-17, which the official Xinhua 
News Agency said was built to "verify new technology," was the first to 
be successfully tested in space. It's also dramatically unlike 
propulsion systems of the past. 
 
Scientists have been working for years to develop long-lasting, 
deep-space-capable alternatives to chemical propulsion. Research into 
electric propulsion, for example, was under way in the United States and
 the Soviet Union even while the first Apollo missions were putting men 
on the moon more than 40 years ago. 
 
Chemical propulsion is the best option for a short burst of power, but 
mass can be moved via electric propulsion over a much longer period. 
Using a chemical propulsion system, 1 kg of mass can be moved for 300 
seconds using 1 kg of fuel. But an electric propulsion system can 
perform the same task over a period of 9,000 seconds, or two and a half 
hours. 
 
U.S. researchers led by scientist Harold Kaufman of the National 
Aeronautics and Space Administration (NASA) worked on electron 
bombardment thrusters, which are now called Kaufman thrusters. Soviet 
researchers, guided by A. I. Morozov of the Kurchatov Institute, focused
 on the Hall-effect thruster technology. 
 
Kaufman thrusters are more fuel-efficient and have a higher specific 
impulse than Hall-effect thrusters. But the Hall-effect thruster 
mechanism is less complicated and smaller than its rival. 
 
The first Kaufmann thruster for a deep-space mission kicked into action 
aboard NASA's Deep Space 1 spacecraft in 1998. It delivered a relatively
 small amount of thrust — roughly equivalent to the amount of 
gravity-induced pressure that keeps a single sheet of paper lying flat 
on a table. But in space, that was enough thrust to accelerate the 
spacecraft by up to 32 km per day. 
 
Moreover, the Kaufmann thruster managed to operate for more than 14,000 
hours — a longer lifespan than all of the world's chemical propulsion 
engines ever built put together. 
 
Hall-effect thrusters have been used to propel more than 238 
communications satellites since 1971. But researchers have been unable 
to overcome the system's shortcomings, such as its relatively short 
lifespan and the fact that its ion plume can damage the thruster mechanism. 
 
Chinese Breakthough

Chinese space scientists considered but then abandoned the idea of using
 electric thrusters for satellites in the 1980s. But then researchers, 
led by H.I.T. scientist Yu Daren, a child prodigy who joined the 
institute at age 15, built on the success of the Hall-effect thruster to
 develop the HEP-100MF. 
 
The H.I.T.'s work began in the 1990s, Yu told Caixin in a recent 
interview, after the Russians could hail the success of their 
Hall-effect thruster technology and after commercial satellites in the 
United States started using a so-called ion thruster in 1997. 
 
A wave of Chinese researchers that included Yu initially tried to 
replicate Mozorov's findings in their own labs. Eventually, they decided
 to go beyond the Russians by using magnetism to confine the thruster's 
damaging plume. 
 
Mozorov's team had developed a rudimentary magnetic-focus system. But 
when Yu's team visited Mozorov in Moscow, they found the Russian 
technology as unreliable as their own. 
 
"The father of the Hall-effect thruster had the same problem: 
inconsistent performance," Yu told Caixin. "But my team realized that, 
if it's possible to control the ion jet for even one instant, there's a 
possibility that we can extend this control, and focus the jet 
consistently." 
 
Unlocking the secret would require many years of trial and error, Yu 
believed. Thus, the Chinese space program started giving more attention 
to electric propulsion. 
 
Interest has grown gradually. Only 20 people attended China's first 
National Electric Propulsion Conference at HIT in 2005. But 150 
scientific papers were submitted to the annual conference in 2016. 
 
In October 2012, China space-tested one Shijian-series satellite with a 
Kaufman thruster and another with a Hall-effect thruster. Each 
thruster's experiment lasted seven minutes. 
 
"Forty years of work went into those seven minutes," said Zhang Weiwen, 
director of the CAST Institute 510, whose scientists developed the 
thrusters. 
 
In 2015, China Aerospace Science and Technology Corp. Institute 801 
researchers announced a breakthrough in Hall-effect technology. They 
said they had developed a thruster with a lifespan of 75,000 hours that 
could ignite 15,000 times and burn 18,000 hours without a break. 
 
The following year, Yu's team and CAST Institute 502 researchers said 
they had developed a Hall-effect thruster that would improve on its 
predecessor by up to 30 percent, the thruster's chief designer Mao Wei 
told the South China Morning Post. They called it the HEP-100MF.

The November experiment, which was the first flight test for the 
HEP-100MF, has fueled confidence in China's propulsion technology and 
the space program's ability to rocket into deep space.

"The technology for deep-space exploration already exists," Yu said. "All we need now is a go-ahead from the government." 
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EmDrive 
 
<img alt="[IMG]" class="bbCodeImage LbImage" data-url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjVriK8yDGG2HNcye342KZDE-KtMSz0DjNkkrZq3oYcTUAk4xfhM4CJwsqL8v3xW60zaDhWXuPNrI7gluR0KoNBsCj11dxXC6ReMEU0YHFAM3JjBFzbHkHw880qpTnDZIj7yc8IaOCFpwoX/s640/emdrive.jpg" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjVriK8yDGG2HNcye342KZDE-KtMSz0DjNkkrZq3oYcTUAk4xfhM4CJwsqL8v3xW60zaDhWXuPNrI7gluR0KoNBsCj11dxXC6ReMEU0YHFAM3JjBFzbHkHw880qpTnDZIj7yc8IaOCFpwoX/s640/emdrive.jpg" /> 
EmDrive and the propellentless Cannae drive 
 
CAST has held a press conference in Beijing explaining the 
importance of the EmDrive research and to move the technology forward. 
 
 EM Drive already on board its version of the International Space Station,<a href="http://www.nextbigfuture.com/2016/12/jerry-pournelle-talks-about-chinas.html" target="_blank"> the space laboratory Tiangong-2</a>. 
Chinese researchers have at least constructed an EM Drive and have been studying it for more than five years now.

Chief designer of the CAST (China Academy of Space Technology) communication satellite division, Li Feng, 
told the media that so far their EM Drive only produces millinewtons of 
thrust (similar to NASA's version) and to make it functional, they need 
to get those levels up to between 100 millinewtons and 1 newton.

The team is allegedly now working on the cavity design of the EM Drive 
and the position of the thruster, before testing their new versions on 
their satellites in orbit.

Logically if an EMDrive was placed on Tiangong-2 and no thrust was 
produced in orbit, then the CAST team would probably not hold a
 press conference. 
If tiny thrust was produced
 in orbit and in a vacuum then further research would be pursued. 
Further research could still occur if thrust seemed to be produced on 
the ground but did not appear in orbital microgravity. 
"This technology is currently in the latter stages of the 
proof-of-principle phase, with the goal of making the technology 
available in satellite engineering as quickly as possible," Li Feng 
explained at the press conference.

"Although it is difficult to do this, we have the confidence that we will succeed." 
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Cutting-Edge Thruster Gives Space Program a Lift

The Shijian-17 satellite, loaded with the HEP-100MF thruster, is launched by a Long March 5 rocket in the Wenchang Satellite Launch Cen...

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Cutting-Edge Thruster Gives Space Program a Lift

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