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Topic: ATRAP

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Antimatter

In the News (Fri 1 Jan 10)

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	First glimpse inside cold antimatter atoms
		ATRAP uses antiprotons from CERN's Antiproton Decelerator, and positrons from a radioactive source, to produce cold antihydrogen.
		The ATRAP scientists are quite sure that the antihydrogen atoms are created when two positrons collide with one antiproton in a process called "three body recombination", in part because they had predicted that this process would produce antihydrogen atoms at a high rate.
		ATRAP scientists caution that they still have many experiments to do, much apparatus to design, many techniques to invent, many student to train, and many night shifts to work before there is a precise comparison of antihydrogen and hydrogen.
	www.eurekalert.org /pub_releases/2002-10/aiop-fgi102802.php (1164 words)

	The Antimatter Factory - ATRAP
		The goal of ATRAP is to produce cold antihydrogen atoms and use laser spectroscopy to check, with very high accuracy, if the properties of antihydrogen and hydrogen atoms are the same.
		To reach their goal, ATRAP physicists have two main steps to accomplish : they have to build the antiatoms first, and then be able to store them for a period long enough to perform all the required measurements.
		For step one, ATRAP will use the world's most intricate Penning trap structure, able to accumulate antiprotons coming from the AD and positrons originating from a radioactive source at the same time.
	livefromcern.web.cern.ch /livefromcern/antimatter/factory/AM-factory04-b.html (229 words)

	Harvard Gazette: Scientists look inside antimatter
		ATRAP's "star player" was a so-called "nested Penning trap," invented to make the slowed antiprotons and positrons interact in a way that would unite them into antihydrogen.
		Gabrielse assumed that ATHENA would next attempt do what ATRAP was trying to do, improve the detection process before making an announcement that antihydrogen had, at last, been made and cooled to the point where it could be compared with hydrogen.
		The trap ATRAP designed to hold antimatter in a magnetic grip is being used to hold drug compounds so they can be analyzed more precisely than heretofore possible.
	www.news.harvard.edu /gazette/2002/11.14/01-anti.html (1359 words)

	CERN Courier - ATRAP looks inside antihydro - IOP Publishing - article
		ATRAP's technique relies on trapping positrons between two bunches of antiprotons in a nested trap structure.
		The ATRAP method has allowed the first measurement of the physics of antihydrogen, and is a step towards the precision measurements that will allow matter-antimatter comparisons to be made.
		Using a completely different detection technique to ATHENA, and providing the first glimpse into the internal structure of antihydrogen, ATRAP has shown that CERN researchers are well on the way to understanding the first entry in the periodic table of the anti-elements.
	www.cerncourier.com /main/article/42/10/1/1 (419 words)

	The Angiotensin II Type I Receptor-associated Protein, ATRAP, Is a Transmembrane Protein and a Modulator of Angiotensin ...
		(B) Endogenous ATRAP in HEK-293 cells was stained with polyclonal antibodies raised to the C-terminal region of ATRAP and observed by using Alexa-labeled secondary antibodies.
		the trafficking of ATRAP vesicles from the perinuclear compartment
		The HA-epitope tag located at the N-terminal end of ATRAP is accessible to the antibodies both in Triton X-100–permeabilized (A) and –nonpermeabilized cells (B); in contrast, cells expressing ATRAP with the epitope tag at the C-terminal end are accessible to the antibody only when the cells are permeabilized with detergent (C and D).
	www.molbiolcell.org /cgi/content/full/14/12/5038 (7385 words)

	Cloning and Characterization of ATRAP, a Novel Protein That Interacts with the Angiotensin II Type 1 Receptor -- ...
		The ratio of receptor and ATRAP DNA was 1:3.
		ATRAP was recovered with the recombinant MBP-AT 1a
		The subcellular localization of epitope-tagged ATRAP was examined in transfected COS-7 cells by fluorescence microscopy.
	www.jbc.org /cgi/content/full/274/24/17058 (3750 words)

	Probing the antiworld (October 2005) - Physics World - PhysicsWeb
		ATRAP quickly followed with separate and quite distinct observations, and a new era in atomic physics was born.
		ATRAP, on the other hand, uses electric fields to pull weakly bound anti-atoms apart, and then traps and records the antiprotons as they annihilate.
		Using this technique, the ATRAP team found that its antihydrogen states correspond to principal quantum numbers in the range n = 40-70, which means the antihydrogen is likely to have been formed via the three-body process.
	physicsweb.org /articles/world/18/10/4/1?rss=2.0 (4066 words)

	Science
		Last year the ATRAP (for Antihydrogen Trap) team led by Gerald Gabrielse of Harvard University, announced they'd pioneered methods of slowing down negatively charged antiprotons and combining them with slow positrons, the positively charged antimatter equivalent of electrons, to create an environment for forming the simplest possible anti-atom: antihydrogen.
		The ATRAP team took their hard-won anti-atoms and ripped them apart with an electric field.
		Gabrielse is joined in his efforts by ATRAP team members from Harvard University, the Forschungszentrum Jülich, CERN, the Max-Planck-Institut für Quantenoptik in Garching, the Ludwig-Maximilians-Universität in Munich and York University.
	aboutfacts.net /Science1.htm (583 words)

	NSERC - The Master of Antimatter
		The challenge for the ATRAP team, and a group called ATHENA working concurrently at CERN, was to find a way to reliably create abundant antihydrogen that could be studied.
		With ATRAP, he helped develop a technique called three-body recombination, in which a positron is used as a cue ball to knock another positron into orbit around an antiproton to produce antihydrogen.
		The ATRAP team consists of more than a dozen researchers from Harvard University, York University, as well as Jülich University and the Max Planck Institute, both in Germany.
	www.nserc.ca /news/2004/p040311_bio4.htm (942 words)

	CERN Courier - ATRAP catches speed of antih - IOP Publishing - article
		Both the ATRAP and ATHENA experiments at CERN's Antiproton Decelerator announced the production of large numbers of "cold" antihydrogen atoms in 2002 (CERN Courier November 2002 p5;December 2002 p5).
		Now the ATRAP collaboration has demonstrated a technique for determining the velocity of those antihydrogen atoms that pass through an oscillating electric field without ionizing.
		In ATRAP, antihydrogen atoms form in a nested Penning trap and then move through an electric-field region prior to detection; only those atoms not ionized in the field are detected.
	www.cerncourier.com /main/article/44/8/6 (307 words)

	CFI - Pressclip_02
		In publishing its paper, Athena appears to have just beaten a consortium, also based at CERN and known as Atrap, which has also been in the forefront of antimatter research.
		In an e-mail message, Atrap's leader, Dr. Gerald Gabrielse of Harvard, called the production of anti-hydrogen an "important and challenging" milestone, adding that his group had seen similar signals.
		In science fiction, antimatter, with its perfect convertibility to energy, is the ultimate rocket fuel, but the CERN scientists see their anti-hydrogen atoms as a ticket not across the galaxy but in effect to a different mathematical universe, in which positive is negative and left is right.
	www.freedomofinfo.org /media/pressclip_02.html (1052 words)

	Pictures (Site not responding. Last check: 2007-11-06)
		Jubilant ATRAP collaborators next to the apparatus that first trapped, electron-cooled and stacked 4.2 K antiprotons at CERN's AD.
		News Release: ATRAP traps first antiprotons at CERN's new AD
		Overview of the ATRAP Apparatus and Experimental Layout.
	hussle.harvard.edu /~atrap/Pictures/Pictures.html (72 words)

	School of Physics: Colloquia and Seminars in Spring 2005 (Site not responding. Last check: 2007-11-06)
		To many, antimatter is both science and fiction: antimatter invokes futuristic fascination and, for scientists, provides a laboratory opportunity to study fundamental physics concepts such as violation of CPT symmetry and search for differences in the force of gravity upon antimatter and matter.
		Both experiments store and recombine cold positrons and antiprotons in the same Penning trap using a combination of strong magnetic (4 -5 Tesla) and quadrupole electrostatic fields.
		The state analysis by field ionization employed by the ATRAP experiment reveals that anti-hydrogen is formed (and detected) in highly excited states.
	www.physics.gatech.edu /colloquia-seminars/colloquia/022305.html (175 words)

	THE INTERNAL STATES OF ANTI-HYDROGEN (Site not responding. Last check: 2007-11-06)
		THE INTERNAL STATES OF ANTI-HYDROGEN have been studied, for the first time, by the ATRAP collaboration, working at CERN where antiprotons are slowed and then joined with positrons to form anti-hydrogen atoms within a detector- and electrode-filled enclosure (a nested Penning trap) over the past year.
		This class of events constitutes a background which must be subtracted out in the analysis process, and it precludes one from identifying any particular double-annihilation event as having been a genuine anti-hydrogen (sometimes written as an H with a bar over it).
		In recent work ATRAP sees a further increase in the antihydrogen production rate by using a small radio transmitter to heat antiprotons into making repeated collisions with cold positrons.
	newton.ex.ac.uk /aip/glimpse.txt/physnews.611.1.html (654 words)

	Antihydrogen at the MPQ
		The goal of ATRAP is to produce cold antihydrogen and measure its properties with high precision.
		In addition we participate in the experiments going on at the Antiproton Decelerator at CERN (Geneva) where the ATRAP experiments are performed with actual antimatter (we don't have antimatter at the MPQ!).
		Information about the ATRAP collaboration is available at the ATRAP collaboration home page.
	www.mpq.mpg.de /~haensch/antihydrogen (225 words)

	Prying apart antimatter - Physics - Brief Article Science News - Find Articles
		Now, a second CERN group, known by the acronym ATRAP, has independently made slow-paced antihydrogen atoms.
		Plus, the ATRAP team took another step: They used an electric field to pry apart the exotic atoms' positrons and antiprotons.
		By revealing how tightly joined those components were, the prying provided a measure of the so-called ionization energies of antihydrogen atoms at different levels of excitation.
	www.findarticles.com /p/articles/mi_m1200/is_2002_Dec_21/ai_96417288 (325 words)

	Print the story (Site not responding. Last check: 2007-11-06)
		Scientists, wondering about a signature for the presence of this mysterious species antihydrogen, were disappointed as no direct signature whatever was presented.
		In fact, a spectral identification of antihydrogen is impossible since measuring its spectrum is exactly the goal of ATHENA and ATRAP collaborations.
		Strangely, the same media failed to report that on October 21 2002, a paper was published with a signature for the antihydrogen atom in the observed line spectrum of natural H [2], an essential step in the discovery of natural antihydrogen by G. Van hooydonk, science professor at and former Chief-Librarian of the Ghent University.
	www.physorg.com /printnews.php?newsid=3226 (400 words)

	[No title]
		Two experiments at the European Laboratory for Particle Physics (CERN), named ATRAP and ATHENA, are planned that will test CPT symmetry of the spectra of hydrogen and anti-hydrogen, he added.
		Later this year, a new machine at CERN will begin operation that eventually will allow the production of enough anti-hydrogen to enable ATRAP and ATHENA physicists to look for matter-antimatter asymmetries of this type.
		According to the new theory, differences between the spectra of hydrogen and anti-hydrogen also would provide further evidence for time-reversal violation.
	newsinfo.iu.edu /OCM/releases/antimatt.htm (725 words)

	Cool Solutions: Alarm for Server Status Change (Site not responding. Last check: 2007-11-06)
		In ZfS, what is the alarm to configure for server status change?I have been looking through the alarm dispostions in ConsoleOne and can'tfind the right alarm to configure when a server status change trap isreceived.An example is when you monitor DNS on a server, I see an alert on theconsole and get a ticker message.
		What do I configure to have that forward atrap to another console or send an SMTP message?
		Right click on the Site itself and select properties.
	www.novell.com /coolsolutions/qna/4730.html (110 words)

	The Antimatter Factory - The AD experiments
		ASACUSA " Atomic Spectroscopy and Collisions using Slow Antiprotons";
		ATHENA and ATRAP's goal is to produce antihydrogen in traps, by combining antiprotons delivered by the AD with positrons emitted by a radioactive source.
		Antihydrogen atoms were first observed at CERN in 1995, and later (1997) at Fermilab.
	livefromcern.web.cern.ch /livefromcern/antimatter/factory/AM-factory04.html (177 words)

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