NEW GAMMA-RAY OBSERVATORY HAS BEGUN THE STUDY OF THE ENERGETIC UNIVERSE

FROM:  LOS ALAMOS NATIONAL LABORATORY 
New Gamma-Ray Observatory Begins Operations at Sierra Negra Volcano In The State Of Puebla, Mexico

New Site to Observe Supernovas and Supermassive Black Holes

LOS ALAMOS, N.M., August 21, 2013—The High-Altitude Water Cherenkov (HAWC) Gamma Ray Observatory has begun formal operations at its site in Mexico. HAWC is designed to study the origin of very high-energy cosmic rays and observe the most energetic objects in the known universe. This extraordinary observatory, using a unique detection technique that differs from the classical astronomical design of mirrors, lenses, and antennae, is a significant boost to international scientific and technical knowledge.

“The HAWC observatory will search for signals from dark matter and to study some of the most extreme objects in the universe, such as supermassive black holes and exploding stars,” said Brenda Dingus, principal investigator and a research fellow at Los Alamos National Laboratory. Dingus is a Fellow of the American Physical Society, and in 2000 was a recipient of the Presidential Early Career Award for Scientists and Engineers.

HAWC is located at an altitude of 4100 meters on the slope of the volcanoes Sierra Negra and Pico de Orizaba at the border between the states of Puebla and Veracruz. The observatory, which is still under construction, uses an array of Cherenkov detectors to observe high-energy cosmic rays and gamma rays. Currently 100 out of 300 Cherenkov detectors are deployed and taking data. Each Cherenkov detector consists of 180,000 liters of extra-pure water stored inside an enormous tank (5 meters high and 7.3 meters in diameter) with four highly sensitive light sensors fixed to the bottom of the tank.

“Los Alamos has a long history of working in this field and built the predecessor to the HAWC observatory, called Milagro, located at the Los Alamos site in New Mexico,” Dingus said.

HAWC 15 Times More Sensitive Than Predecessor

“HAWC will be more than 15 times more sensitive than Milagro was, and it will detect many new sources of high-energy photons. Los Alamos also studies these high-energy phenomena through complex computer simulations to understand the physical mechanisms that accelerate particles to energies millions of times greater than man-made accelerators,” Dingus said.

The construction and operation of HAWC has been made possible by the financial support of several Mexican institutions such as the Consejo Nacional de Ciencia y Tecnología (CONACYT), the Universidad Nacional Autónoma de México (UNAM), and the Instituto Nacional de Astrofísica, Óptica y Electrónica (INAOE). Funding has also been provided by the United States through the National Science Foundation (NSF), the Department of Energy (DOE) Office of Science, the Los Alamos National Laboratory (LANL), and the University of Maryland. The University of Maryland is the managing institute of the project overall.

The HAWC array, operating with 100 Cherenkov detectors since August 1 and growing each week, will be sensitive to high-energy particles and radiation between 100 GeV and 100 TeV, energy equivalent to a billion times the energy of visible light. For more information online see http://www.hawc-observatory.org/.

In 2009, HAWC was identified as the Mexican astronomical project with the highest expected impact on high-energy astrophysics. Shortly thereafter a test array with three Cherenkov detectors was installed at the volcano Sierra Negra and successfully observed cosmic rays and gamma rays. Following these early tests, a prototype array of seven Cherenkov detectors was built in 2009 to test the tank design, simulate real data-taking, and study the logistics of deploying a large-scale observatory in this remote location. In 2012, the first 30 of 300 HAWC detectors were deployed, and since that time have been operated nearly continuously. The 30-detector stage of HAWC permitted calibration of the observatory via the observation of the shadow of the moon as it blocked cosmic rays. (http://1.usa.gov/14jjT8w)

Today, the scientific team of HAWC will formally begin observations of the most violent phenomena in the known universe, such as supernovae explosions and the evolution of supermassive black holes.

Image captions:

Figure 1: Artist’s conception of a black hole in the center of a distant galaxy emitting gamma rays, one of which reaches the Earth. Upon entering the terrestrial atmosphere, the gamma ray will produce a cascade of energetic particles that travels to detectors on the ground. Credit: Aurore Simonnet, Sonoma State University.

Figure 2. Diagram of a HAWC Cherenkov detector, with a person shown for scale. Inside the Cherenkov detector, a high-energy charged particle (red line) produces Cherenkov light (green lines) as it moves from top to bottom through the tank. The Cherenkov light is recorded by four highly sensitive photo-sensors placed at the bottom of the Cherenkov detector. By combining measurements from many tanks the properties of the original gamma ray or cosmic ray can be inferred.

Figure 3. Image of an event produced by particle cascade in the HAWC observatory. The larger circles represent each Cherenkov detector in HAWC, each contains 4 photo-sensors represented in the figure as smaller circles. The color of each small circle or photo-sensor represents the arrival time of the particle cascade to each sensor. This is one of the first images recorded by HAWC since the beginning of operations. In particular, this cascade arrived from the upper left to the bottom right and its center hit HAWC at the “X” mark. The time scale is given in the lower scale in nanometers.

Figure 4. The HAWC Observatory taken in August 2013 from the summit of Sierra Negra. The image has been digitally altered to show HAWC as it will appear when construction is complete in 2014. The 111 Cherenkov detectors currently installed (100 Cherenkov detectors in operation) are colored white and located in the upper right quadrant of the array.

Background: The Most Energetic Particles in the Known Universe

Gamma rays (electromagnetic radiation of very high frequency) and cosmic rays (subatomic particles of very high energy) are products of the most energetic and cataclysmic events in the known universe. These phenomena include the collisions of two neutron stars, the explosions of supernovae, binary systems of stars with stellar accretion, and active gal actic nuclei which host black holes millions of times more massive than the sun.

When high-energy cosmic rays and gamma rays reach the Earth, they interact with air molecules in the upper atmosphere. Gamma rays, for example, are converted into pairs of charged matter and anti-matter particles (mainly electrons and positrons). These particles rapidly interact with other air molecules, producing additional gamma rays of reduced energy, which then create further charged particle pairs. This chain reaction proceeds until a large cascade of particles and radiation reaches ground level, where it can be recorded in the HAWC detectors.

When the charged particle cascade from an extra-terrestrial gamma ray passes through a Cherenkov detector, its particles are traveling faster than the speed of light in water. The resulting effect is similar to the shock wave produced in the atmosphere by a supersonic airplane (a "sonic boom"), but instead of producing sound the particles produce a visible cone of light. The flash of light, called Cherenkov radiation, is measured by the light sensor fixed to the bottom of each detector in HAWC. By combining the light signal observed in many tanks with fast electronics and high precision computing equipment, it is possible for scientists to determine the time of arrival, energy, and direction of the original extraterrestrial gamma ray or cosmic ray.

THE MISSILE AND SPACE INTELLIGENCE CENTER

GTR-18 surface-to-air missile simulators are fired at incoming aircraft during nighttime warfare training at the Yodaville close air support range near Marine Corps Air Station Yuma, Ariz., April 11, 2011. The Defense Intelligence Agency's Missile and Space Intelligence Center helps to protect U.S. forces from similar real weapons. U.S. Marine Corps photo by Cpl. Benjamin R. Reynolds

FROM: U.S. DEPARTMENT OF DEFENSE
Missile, Space Intelligence Center Saves Warfighter Lives
By Cheryl Pellerin
American Forces Press Service

WASHINGTON, March 8, 2013 - Engineers, scientists and analysts of the Defense Intelligence Agency's Missile and Space Intelligence Center provide high-confidence assessments of foreign missile and space systems and other critical intelligence products that help to keep warfighters from harm

Spread out over some of the 38,000 acres of the Army's Redstone Arsenal in the Appalachian highlands of northern Alabama are the laboratories, high-performance computing operations, test areas and hardware storage spaces that make up MSIC's vast engineering complex.

"The work itself is pretty detailed and geeky," MSIC Director Pamela McCue explained during an interview with American Forces Press Service. "We're a bunch of engineers and scientists, and by nature we love to figure out how things work."

McCue, an electrical engineer, said the work involves looking at all sources of intelligence and figuring out the characteristics, performance and operations of threat weapons, including surface-to-air missiles, anti-tank guided missiles, ground-based anti-satellite systems and short-range ballistic missiles.

Service members who conduct operations anywhere in the world are likely to encounter a variety of weapons, McCue said.

"Our job is to understand the threat weapons and push intelligence to the military so they will be prepared," she added. "Hopefully, we can do it so our service [members] won't even encounter the threat weapons, but if they do, we want them always to come out on top."

MSIC engineers and scientists focus on how a weapon works, how well it works, and how it's vulnerable or how it can be defeated, she said. Air and missile defense is a key mission.

"These are surface-to-air missiles primarily that fire at our aircraft, ... so anywhere that we have an air operation going, we are likely to face these kinds of systems," McCue noted.

The missiles range from air defense systems that a person can carry and fire from the shoulder to long-range air defense systems that can engage targets over hundreds of miles. The director said millions of "man-portable" systems are in use around the world.

With the knowledge its scientists and engineers gain, MSIC works with those in the services who design air survivability equipment, the director said, "so if you're carrying that on an aircraft, it will detect that a missile has been launched against it, and it will take action so the missile, hopefully, will not hit the aircraft.

"It can do that either with some kind of countermeasure," she continued, "usually a laser-based countermeasure, or perhaps even [by] dropping flares, which are electro-optical infrared devices [designed to] distract the missile and pull it off course. These are techniques that we can equip our military aircraft with -- and especially our helicopters, which have to operate in harm's way -- so even if they are engaged, they won't be hit."

Another important area for MSIC includes ground-based weapons that fire missiles or directed energy at platforms in space. These include anti-satellite missiles and directed-energy weapons.

"We in the United States haven't had a lot of [directed-energy weapons] programs for a while, [but] others around the world are still developing directed-energy weapons -- Russia and China are the two big ones," she said.

Very-high-energy weapons include laser systems, she added, and such weapons either would damage sensors on airplanes or satellites, or as technology evolves, physically destroy a platform in air or space.

The other important mission area for MSIC involves short-range ballistic missiles -- those that can engage targets from tens of miles out to 600 miles out.

"These systems are important because they're the weapon of choice for a lot of [nations] to reach beyond their borders, ... and they can be fitted to carry weapons of mass destruction, so they're a big concern for us and our allies," McCue said. "They're certainly a big player in the Middle East and North Korea."

Today, MSIC helps to defend against ballistic missiles on the same ground where, in 1950, German rocket developer Wernher von Braun and his team of top rocket scientists began working with the Army to develop the Jupiter ballistic missile and others.

The work was done as part of the Army Ballistic Missile Agency, which von Braun headed, and McCue said the organization had a small intelligence cell that was "taking a look at what was going on around the world in similar developments."

MISC began then as an Army research and development center, the director added, and in the 1990s, it became part of the Defense Intelligence Agency.

"We've had some of our missions since the very first days, like looking at those threat missile developments to compare them to what we were doing on this side," McCue said. "We picked up additional missions as weapons evolved and new things came online, like the ground-based anti-satellite mission."

In the beginning, the weapons were pretty basic, she said. "For instance, a surface-to-air missile would be capable of tracking a single aircraft at a time," she explained. "It would have a very tightly controlled process for controlling the missile to the target, and it would be very straightforward."

Now, the director said, there's a lot more flexibility.

"On the surface-to-air missile side, you have systems that can track many targets at one time and send many missiles to different targets at the same time," she added, and on the ballistic-missile side, a simple ballistic trajectory may be replaced by extreme maneuvers and countermeasures.

"A lot more complexity in the weapons has come from having more capability, more technology and more computers," the director observed.

Computers have boosted capability on the analysis side, McCue said. "It makes the weapon systems harder to figure out," she said, "but it makes our analysis a little easier and more capable."

The center also has put more emphasis on command and control, as the processes and communications surrounding the launch of a rocket or missile become more computer-driven, she said.

MSIC now has fewer people than it did during the Cold War. But amid the geopolitical instability of much of the world today, MSIC's scientists, engineers and analysts have many more kinds of weapons to deal with. Computer power helps keep the pace, along with a good priority system, McCue said.

"We don't have more people, but we do what I like to call 'risk management,'" the director said. "Every weapon system out there in the world doesn't have an equally high probability of being in an engagement at any given time, so we're constantly assessing priorities and putting the resources we have on the most important weapons, knowing that we can't cover everything."

Over time, major developments in technology could drive changes in MSIC's work, but McCue said she believes being an engineering organization gives MSIC an advantage.

"We tend to keep up with technology, because we use it in our analysis techniques. The folks in the ... labs we work with and the national labs across the country also keep up with technologies, and we're well-linked there," she said. "So ... we have the right mindset, and we are following the technology as a matter of course. The trick is anticipating how that might play into threat weapons."

Technologically, she added, one game-changer could involve people who do unexpected things with weapons, driven by conflicts such as the unrest in Syria or North Korea's use of missiles.

Along with keeping up with evolving technology, working with partners is an important aspect of the work at MSIC these days.

"We are very integrated into the whole intelligence system," the director said, adding that MSIC also works closely with the services and with U.S. allies and partners.

Each service has aircraft they have to fly, she added, "so they have to worry about surface-to-air missiles, [and] they're all what we call customers of ours. We make sure we understand what they need [and] we understand what kind of intelligence they need to put the right things on their military systems, ... and we push intelligence to them in the right form."

Where international partners are concerned, McCue said, "with virtually every partner that the United States has, we work with our counterparts in those countries."

The budget problems plaguing the nation and the Defense Department present a challenge that McCue said the center's scientists and engineers will have to tackle.

"In my observation over the years," she said, "there's a lot of innovation that can come from tight times -- when you're really focused on getting the job done and you've got to figure out some way to do it. We're adaptive and we're flexible, and we're going to keep putting those priorities up there and making sure we get the important things done."