“No significant signs of new physics with the present data yet but it takes only one significant deviation in the data to change everything.” — Albert De Roeck, CERN
First collisions of protons at the world’s largest science experiment are expected to start the first or second week of June, according to a senior research scientist with CERN’s Large Hadron Collider in Geneva.
“It will be about another six weeks to commission the machine, and many things can still happen on the way,” said physicist Albert De Roeck, a staff member at CERN and a professor at the University of Antwerp, Belgium and UC Davis, California. De Roeck is a leading scientist on CMS, one of the Large Hadron Collider’s key experiments.
The LHC in early April was restarted for its second three-year run after a two-year pause to upgrade the machine to operate at higher energies. At higher energy, physicists worldwide expect to see new discoveries about the laws that govern our natural universe.
Book a live interview
To book a live or taped interview with SMU Physics Department Chair Fred Olness in the SMU News Broadcast Studio call SMU News at 214-768-7650 or email news@smu.edu.
De Roeck made the comments Monday while speaking during an international meeting of more than 250 physicists from 30 countries on the campus of Southern Methodist University, Dallas.
“There are no significant signs of new physics yet,” De Roeck said of the data from the first run, adding however that especially SUSY diehards — physicists who predict the existence of a unique new theory of space and time called SuperSymmetry — maintain hopes of seeing evidence soon of that theory.
De Roeck in fact has high expectations for the possibility of new discoveries that could change the current accepted theory of physical reality, the Standard Model.
“It will take only one significant deviation in the data to change everything,” De Roeck said. “The upgraded machine works. Now we have to get to the real operation for physics.”
“Unidentified Lying Object” not a problem — remains stable
But work remains to be done. One issue the accelerator physicists remain cautiously aware of, he said, is an “Unidentified Lying Object” in the beam pipe of the LHC’s 17-mile underground tunnel, a vacuum tube where proton beams collide and scatter particles that scientists then analyze for keys to unlock the mysteries of the Big Bang and the cosmos.
Because the proton beam is sensitive to the geometry of the environment and can be easily blocked, the beam pipe must be free of even the tiniest amount of debris. Even something as large as a nitrogen particle could disrupt the beam. Because the beam pipe is a sealed vacuum it’s impossible to know what the “object” is.
“The unidentified lying object turns out not to be a problem for the operation, it’s just something to keep an eye on,” De Roeck said. “It’s in the vacuum tube and it’s not a problem if it doesn’t move and remains stable.”
The world’s largest particle accelerator, the Large Hadron Collider made headlines when its global collaboration of thousands of scientists in 2012 observed a new fundamental particle, the Higgs boson. After that, the collider was paused for the extensive upgrade. Much more powerful than before, as part of Run 2 physicists on the Large Hadron Collider’s experiments are analyzing new proton collision data to unravel the structure of the Higgs.
The Large Hadron Collider straddles the border between France and Switzerland. Its first run began in 2009, led by CERN, the European Organization for Nuclear Research, in Geneva, through an international consortium of thousands of scientists.
Particle discoveries unlock mysteries of cosmos, pave way for new technology
The workshop in Dallas, the “2015 International Workshop on Deep-Inelastic Scattering,” draws the world’s leading scientists each year to an international city for nuts and bolts talks that drive the world’s leading-edge physics experiments, such as the Large Hadron Collider.
Going into the second run, De Roeck said physicists will continue to look for anomalies, unexpected decay modes or couplings, multi-Higgs production, or larger decay rates than expected, among other things.
Particle discoveries by physicists resolve mysteries, such as questions surrounding Dark Matter and Dark Energy, and the earliest moments of the Big Bang. But particle discoveries also are ultimately applied to other fields to improve everyday life, such as medical technologies like MRIs and PET scans, which diagnose and treat cancer.
For example, proton therapy is the newest non-invasive, precision scalpel in the fight against cancer, with new centers opening all over the world.
Hosted by the SMU Department of Physics in Dedman College, the Dallas meeting of physicists began Monday, April 27, 2015, and runs through Friday, May 1, 2015.
The workshop is sponsored by SMU, U.S. Department of Energy’s Office of Science, CERN, National Science Foundation, Fermi National Accelerator Laboratory, Brookhaven National Laboratory, DESY national research center and Thomas Jefferson National Accelerator Facility. — Margaret Allen
SMU is a nationally ranked private university in Dallas founded 100 years ago. Today, SMU enrolls nearly 11,000 students who benefit from the academic opportunities and international reach of seven degree-granting schools. For more information see www.smu.edu.
SMU has an uplink facility located on campus for live TV, radio, or online interviews. To speak with an SMU expert or book an SMU guest in the studio, call SMU News & Communications at 214-768-7650.
New launch of the world’s most powerful particle accelerator is the most stringent test yet of our accepted theories of how subatomic particles work and interact.
Start up of the world’s largest science experiment is underway — with protons traveling in opposite directions at almost the speed of light in the deep underground tunnel called the Large Hadron Collider near Geneva.
As protons collide, physicists will peer into the resulting particle showers for new discoveries about the universe, said Ryszard Stroynowski, a collaborator on one of the collider’s key experiments and a professor in the Department of Physics at Southern Methodist University, Dallas.
“The hoopla and enthusiastic articles generated by discovery of the Higgs boson two years ago left an impression among many people that we have succeeded, we are done, we understand everything,” said Stroynowski, who is the senior member of SMU’s Large Hadron Collider team. “The reality is far from this. The only thing that we have found is that Higgs exist and therefore the Higgs mechanism of generating the mass of fundamental particles is possible.”
There is much more to be learned during Run 2 of the world’s most powerful particle accelerator.
The Large Hadron Collider, the most powerful proton smasher in the world, includes the ATLAS detector, one of the LHC’s four particle detectors. (CERN)
“In a way we kicked a can down the road because we still do not have sufficient precision to know where to look for the really, really new physics that is suggested by astronomical observations,” he said. “The observed facts that are not explained by current theory are many.”
The LHC’s control room in Geneva on April 5 restarted the Large Hadron Collider. A project of CERN, the European Organization for Nuclear Research, the 17-mile LHC tunnel — big enough to ride a bicycle through — straddles the border between France and Switzerland.
Two years ago it made headlines worldwide when its global collaboration of thousands of scientists discovered the Higgs Boson fundamental particle.
The Large Hadron Collider’s first run began in 2009. In 2012 it was paused for an extensive upgrade.
The new upgraded and supercharged LHC restarts at almost twice the energy and higher intensity than it was operating at previously, so it will deliver much more data.
Data flowing from the ATLAS detector’s Liquid Argon Calorimeter — which measures the energies carried by particle interactions — is delivered via a data link computer chip developed by physicists at Southern Methodist University. (CERN)
“I think that in the LHC Run 2 we will sieve through more data than in all particle physics experiments in the world together for the past 50 years,” Stroynowski said. “Nature would be really strange if we do not find something new.”
SMU is active on the LHC’s ATLAS detector experiment Within the big LHC tunnel, gigantic particle detectors at four interaction points along the ring record the proton collisions that are generated when the beams collide.
In routine operation, protons make 11,245 laps of the LHC per second — producing up to 1 billion collisions per second. With that many collisions, each detector captures collision events 40 million times each second.
That’s a lot of collision data, says SMU physicist Robert Kehoe, a member of the ATLAS particle detector experiment with Stroynowski and other SMU physicists.
Evaluating that much data isn’t humanly possible, so a computerized ATLAS hardware “trigger system” grabs the data, makes a fast evaluation, decides if it might hold something of interest to physicists, than quickly discards or saves it.
The Liquid Argon Calorimeter sits at the heart of ATLAS, measuring the energies carried by particle interactions. (CERN)
“That gets rid of 99.999 percent of the data,” Kehoe said. “This trigger hardware system makes measurements — but they are very crude, fast and primitive.”
To further pare down the data, a custom-designed software program culls even more data from each nano-second grab, reducing 40 million events down to 200.
Two groups from SMU, one led by Kehoe, helped develop software to monitor the performance of the trigger systems’ thousands of computer processors.
“The software program has to be accurate in deciding which 200 to keep. We must be very careful that it’s the right 200 — the 200 that might tell us more about the Higgs boson, for example. If it’s not the right 200, then we can’t achieve our scientific goals.”
The ATLAS computers are part of CERN’s computing center, which stores more than 30 petabytes of data from the LHC experiments every year, the equivalent of 1.2 million Blu-ray discs.
Flood of data from ATLAS transmitted via tiny electronics designed at SMU to withstand harsh conditions
An SMU physics team also collaborates on the design, construction and delivery of the ATLAS “readout” system — an electronic system within the ATLAS trigger system that sends collision data from ATLAS to its data processing farm.
Data from the ATLAS particle detector’s Liquid Argon Calorimeter is transmitted via 1,524 small fiber-optic transmitters. A powerful and reliable workhorse, the link is one of thousands of critical components on the LHC that contributed to discovery and precision measurement of the Higgs boson.
The custom-made high-speed data transmitters were designed to withstand extremely harsh conditions — low temperature and high radiation.
“It’s not always a smooth ride operating electronics in such a harsh environment,” said Jingbo Ye, the physics professor who leads the SMU data-link team. “Failure of any transmitter results in the loss of a chunk of valuable data. We’re working to improve the design for future detectors because by 2017 and 2018, the existing optical data-link design won’t be able to carry all the data.”
Each electrical-to-optical and optical-to-electrical signal converter transmits 1.6 gigabytes of data per second. Lighter and smaller than their widely used commercial counterpart, the tiny, wickedly fast transmitters have been transmitting from the Liquid Argon Calorimeter for about 10 years.
Upgraded optical data link is now in the works to accommodate beefed-up data flow
A more powerful data link — much smaller and faster than the current one — is in research and development now. Slated for installation in 2017, it has the capacity to deliver 5.2 gigabytes of data per second.
The new link’s design has been even more challenging than the first, Ye said. It has a smaller footprint than the first, but handles more data, while at the same time maintaining the existing power supply and heat exchanger now in the ATLAS detector.
The link will have the highest data density in the world of any data link based on the transmitter optical subassembly TOSA, a standard industrial package, Ye said.
Fine-tuning the new, upgraded machine will take several weeks
The world’s most powerful machine for smashing protons together will require some “tuning” before physicists from around the world are ready to take data, said Stephen Sekula, a researcher on ATLAS and assistant professor of physics at SMU.
The trick is to get reliable, stable beams that can remain in collision state for 8 to 12 to 24 hours at a time, so that the particle physicists working on the experiments, who prize stability, will be satisfied with the quality of the beam conditions being delivered to them, Sekula said.
“The LHC isn’t a toaster,” he said. “We’re not stamping thousands of them out of a factory every day, there’s only one of them on the planet and when you upgrade it it’s a new piece of equipment with new idiosyncrasies, so there’s no guarantee it will behave as it did before.”
Machine physicists at CERN must learn the nuances of the upgraded machine, he said. The beam must be stable, so physicists on shifts in the control room can take high-quality data under stable operating conditions.
The process will take weeks, Sekula said.
10 times as many Higgs particles means a flood of data to sift for gems
LHC Run 2 will collide particles at a staggering 13 teraelectronvolts (TeV), which is 60 percent higher than any accelerator has achieved before.
“On paper, Run 2 will give us four times more data than we took on Run 1,” Sekula said. “But each of those multiples of data are actually worth more. Because not only are we going to take more collisions, we’re going to do it at a higher energy. When you do more collisions and you do them at a higher energy, the rate at which you make Higgs Bosons goes way up. We’re going to get 10 times more Higgs than we did in run 1 — at least.”
SMU’s ManeFrame supercomputer plays a key role in helping physicists from the Large Hadron Collider experiments. One of the fastest academic supercomputers in the nation, it allows physicists at SMU and around the world to sift through the flood of data, quickly analyze massive amounts of information, and deliver results to the collaborating scientists.
During Run 1, the LHC delivered about 8,500 Higgs particles a week to the scientists, but also delivered a huge number of other kinds of particles that have to be sifted away to find the Higgs particles. Run 2 will make 10 times that, Sekula said. “So they’ll rain from the sky. And with more Higgs, we’ll have an easier time sifting the gems out of the gravel.”
Run 2 will operate at the energy originally intended for Run 1, which was initially stalled by a faulty electrical connection on some superconducting magnets in a sector of the tunnel. Machine physicists were able to get the machine running — just never at full power. And still the Higgs was discovered, notes SMU physics professor Fredrick Olness.
“The 2008 magnet accident at the LHC underscores just how complex a machine this is,” Olness said. “We are pushing the technology to the cutting-edge.”
Huge possibilities for new discoveries, but some will be more important than others
There are a handful of major new discoveries that could emerge from Run 2 data, Stroynowski said.
New physics laws related to Higgs — Physicists know only global Higgs properties, many with very poor understanding. They will be measuring Higgs properties with much greater precision, and any deviation from the present picture will indicate new physics laws. “Improved precision is the only guaranteed outcome of the coming run,” Stroynowski said. “But of course we hope that not everything will be as expected. Any deviation may be due to supersymmetry or something completely new.”
Why basic particles have such a huge range of masses — Clarity achieved by precision measurements of Higgs properties may help to shed light on the exact reason for the pattern of masses found in the known fundamental particles. If new particles are discovered in the LHC during Run 2, the mathematical theories that could explain them might also shed light on the puzzle of why masses have such diversity in the building blocks of nature
Dark matter — Astronomical observations require a new form of matter that acts only via gravity, otherwise all galaxies would have fallen apart a long time ago. One candidate theory is supersymmetry, which predicts a host of new particles. Some of those particles, if they exist, would fit the characteristics of dark matter. LHC scientists will be looking for them in the coming run both directly, and for indirect effects.
Quark gluon plasma — In collisions of lead nuclei with each other, LHC scientists have observed a new form of matter called quark gluon plasma. Thought to have been present in the cosmos near the very beginning of time, making and studying this state of matter could teach us more about the early, hot, dense universe.
Mini black-holes — Some scientists are looking for “mini black-holes” predicted by innovative physicist Stephen Hawking, but that is considered “a v-e-e-e-e-r-y long shot,” Stroynowski said.
Matter-antimatter — A cosmic imbalance in the amounts of matter and its opposite, antimatter, must be explained by particle physics. The LHC is home to several experiments and teams that aim to search for answers.
Understanding what makes up dark matter and dark energy could help answer some of the biggest questions in physics
SMU physicist Jodi Cooley appears in studio while a guest on NPR’s Science Friday radio program to talk about dark matter with host Ira Flatow. (SMU: Nancy George)
SMU physicist Jodi Cooley was a guest of Ira Flatow on National Public Radio’s Science Friday show to share in a discussion about what physicists know and don’t know about mysterious dark matter.
Dark matter is believed to make up the bulk of the matter in the universe.
Cooley, an associate professor in the SMU Department of Physics, is an experimental particle physicist and part of a scientific team searching for dark matter. She’s a member of the Cryogenic Dark Matter Search experiment.
SuperCDMS, as the experiment is called, is currently located deep in the Soudan Underground Laboratory in an abandoned mine in a national park in Minnesota.
SuperCDMS is a collaboration of 18 institutions from the U.S., Canada, and Spain.
“We go deep under the earth to shield ourselves from cosmic-ray radiation so that we can use our detector technology to ‘listen’ for the passage of dark matter through the earth,” says Cooley. “Dark matter is currently believed to be a non-luminous form of matter which makes up 85 percent of the matter in the universe.”
The next-generation of SuperCDMS is slated for construction at SNOLAB, an underground laboratory in Ontario, Canada. With SuperCDMS SNOLAB, physicists will go deeper below the surface of the earth than earlier generations of the experiment. The scientists use the earth as a shield to block out particles that resemble dark matter, making it easier to see the real thing.
Astronomers using NASA’s Hubble Space Telescope discovered a ghostly ring of dark matter that formed long ago during a titanic collision between two massive galaxy clusters. The ring’s discovery is among the strongest evidence yet that dark matter exists. (NASA)
Ira Flatow, host
Becky Fogel, producer
Science Friday
Neutrons, protons, and electrons—these are the basic building blocks of matter. But this kind of matter is only a tiny fraction of the entire universe. The rest, about 95 percent, in fact, is divided between dark matter and dark energy.
Understanding what makes up dark matter and dark energy could help answer some of the biggest questions in physics.
Book a live interview
To book a live or taped interview with Jodi Cooley in the SMU News Broadcast Studio call SMU News at 214-768-7650 or email news@smu.edu.
Physicists Jodi Cooley, Dan Hooper and Nobel Prize winner Steven Weinberg join Ira Flatow to discuss what we do and don’t know about this “darker” side of physics, and what we hope to learn.
FLATOW: As an experimentalist, can you perform any experiments to see what dark matter is made out of?
COOLEY: As a matter of fact we can, and there are different types of experiments that we can perform. The types of experiments that we perform fall into three different categories. Steven had already talked about the first kind, where you’re looking at dark matter particles interacting with other dark matter particles in the article that appeared yesterday.
The other way that you can look for dark matter particles is, dark matter is thought to be in the galaxy all around us, so by building experiments here on earth, we can wait and try to detect the dark matter interacting with the experiments here on earth. That’s the dark matter detection I work on. The third way you could do it is at a collider at the Large Hadron Collider, collide together ordinary matter and look for dark matter coming out.
FLATOW: Is that contemplated? They are tweaking it to come back online. Is that something they are looking for?
COOLEY: I do believe they are. They have a working group at the Large Hadron Collider, both the ATLAS and the CDMS collaborations, both have working groups with people who are looking for a missing energy signature that could be a hint of a dark matter signal.
SMU is a nationally ranked private university in Dallas founded 100 years ago. Today, SMU enrolls nearly 11,000 students who benefit from the academic opportunities and international reach of seven degree-granting schools. For more information see www.smu.edu.
SMU has an uplink facility located on campus for live TV, radio, or online interviews. To speak with an SMU expert or book an SMU guest in the studio, call SMU News & Communications at 214-768-7650.
Rios was a graduate student in the SMU Department of Physics and as part of a team led by SMU Physics Professor Ryszard Stroynowski spent from 2007 to 2012 as a member of the ATLAS experiment at Switzerland-based CERN’s Large Hadron Collider, the largest high-energy physics experiment in the world. Rios and the SMU team were part of the successful search for the Higgs boson fundamental particle.
Rios is now a senior research engineer for Lockheed Martin at NASA’s Johnson Space Center.
By Glenn Roberts Jr.
Symmetry Magazine
As a member of the ATLAS experiment at the Large Hadron Collider, Ryan Rios spent 2007 to 2012 surrounded by fellow physicists.
Now, as a senior research engineer for Lockheed Martin at NASA’s Johnson Space Center, he still sees his fair share.
He’s not the only scientist to have made the leap from experimenting on Earth to keeping astronauts safe in space. Rios works on a small team that includes colleagues with backgrounds in physics, biology, radiation health, engineering, information technology and statistics.
“I didn’t really leave particle physics, I just kind of changed venues,” Rios says. “A lot of the skillsets I developed on ATLAS I was able to transfer over pretty easily.”
The group at Johnson Space Center supports current and planned crewed space missions by designing, testing and monitoring particle detectors that measure radiation levels in space.
Massive solar flares and other solar events that accelerate particles, other sources of cosmic radiation, and weak spots in Earth’s magnetic field can all pose radiation threats to astronauts. Members of the radiation group provide advisories on such sources. This makes it possible to warn astronauts, who can then seek shelter in heavier-shielded areas of the spacecraft.
Johnson Space Center has a focus on training and supporting astronauts and planning for future crewed missions. Rios has done work for the International Space Station and the robotic Orion mission that launched in December as a test for future crewed missions. His group recently developed a new radiation detector for the space station crew.
Rios worked at CERN for four years as a graduate student and postdoc at Southern Methodist University in Dallas. At CERN he was introduced to a physics analysis platform called ROOT, which is also used at NASA. Some of the particle detectors he works with now were developed by a CERN-based collaboration.
Fellow Johnson Space Center worker Kerry Lee wound up a group lead for radiation operations after using ROOT during his three years as a summer student on the Collider Detector at Fermilab, or CDF experiment.
International team of physicists study elusive fundamental particles present at origins of universe, and which still bombard us today.
SMU physicist Thomas E. Coan talked with Fox 4 DFW reporter Dan Godwin about the neutrino, an elusive fundamental particle that scientists are working to understand using one of the most powerful physics experiments in the world.
Godwin hosted Coan on the program Fox4Ward on Nov. 30, 2014. Coan and Godwin discussed neutrinos, one of the most elusive particles in the Standard Model’s “particle zoo.”
Neutrinos are the subject of the NOvA experiment, with the goal to better understand the origins of matter and the inner workings of the universe.
One of the largest and most powerful neutrino experiments in the world, NOvA is funded by the National Science Foundation and the U.S. Department of Energy.
At the heart of NOvA are its two particle detectors — gigantic machines of plastic and electronic arrays.
Book a live interview
To book a live or taped interview with Dr. Thomas E. Coan in the SMU News Broadcast Studio call SMU News at 214-768-7650 or email news@smu.edu.
One detector is at the U.S. Department of Energy’s Fermi National Accelerator Laboratory near Chicago and the other is at Ash River, Minn. near the Canadian border.
Critical to crunching data from the experiment is a network of supercomputers, including the SMU ManeFrame, one of the most powerful academic supercomputers in the nation.
Designed and engineered by about a hundred U.S. and international scientists, NOvA is managed by Fermilab. NOvA’s detectors and its particle accelerator officially started up at the end of October 2014.
Coan, an associate professor in the SMU Department of Physics, is a member of the NOvA experiment. He is co-convener of NOvA’s calibration and alignment group, guiding a crew of international scientists who handle responsibility for understanding the response of NOvA’s detector when neutrinos pass through and strike it.
Neutrinos are invisible fundamental particles that are so abundant they constantly bombard us and pass through us at a rate of more than 100,000 billion particles a second. Because they rarely interact with matter, they have eluded scientific observation.
By Dan Godwin
Fox 4Ward Host
When you talk about the origin of the universe, the Big Bang is widely accepted theory. But it never hurts to have additional evidence. And that’s where an SMU super computer comes in. In this FOX 4Ward, Dan Godwin finds out why the smallest particles in the universe are getting lots of scrutiny.
SMU is a nationally ranked private university in Dallas founded 100 years ago. Today, SMU enrolls nearly 11,000 students who benefit from the academic opportunities and international reach of seven degree-granting schools. For more information see www.smu.edu.
SMU has an uplink facility located on campus for live TV, radio, or online interviews. To speak with an SMU expert or book an SMU guest in the studio, call SMU News & Communications at 214-768-7650.
Most likely cause of 2013-14 earthquakes: Combination of gas field fluid injection, removal
Physicists tune Large Hadron Collider to find “sweet spot” in high-energy proton smasher
