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<p class="MsoNormal"><span style="color:#1F497D">Reminder Dr. Ruggero Caravita (CERN) will be presenting a seminar on
<i>“Advances towards pulsed antihydrogen production for a first antimatter gravity measurement in the AEGIS experiment"</i> tomorrow (Aug. 30<sup>th</sup>) at 2:00pm in 1080 Smith Seminar room. See below for more information about the talk.<o:p></o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Schechter, Robert K. <br>
<b>Sent:</b> Friday, August 24, 2018 2:38 PM<br>
<b>To:</b> Physics-all@lists.osu.edu<br>
<b>Subject:</b> Spectroscopy Institute Seminar August 30: Ruggero Caravita (CERN)<o:p></o:p></p>
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<p class="MsoNormal">Hello,<o:p></o:p></p>
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<p class="MsoNormal">The Spectroscopy Institute will be hosting Ruggero Caravita (CERN) for a seminar at 2:00pm on Thursday August 30, 2018 in 1080 Smith Seminar room. Ruggero’s topic will be
<i>“Advances towards pulsed antihydrogen production for a first antimatter gravity measurement in the AEGIS experiment."</i> See below for more information on Ruggero’s talk.<o:p></o:p></p>
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<span style="font-size:11.0pt;font-family:"Calibri",sans-serif">The direct measurement of Earth's gravitational acceleration on a purely antimatter system has been a dream of experimental particle physics for more than twenty years, since the first antiproton
cooling attempts at CERN's Low Energy Antiproton Ring. The efficient production of antihydrogen atoms in traps at CERN's Antiproton Decelerator in 2002, opened a possibility to perform such measurement of a neutral antimatter system, overcoming the difficulties
experienced with charged antiparticles. This is the ambitious objective of the AEgIS collaboration: measure the value of g using a pulsed source of cold antihydrogen and a moiré deflectometer/Talbot-Lau interferometer.<o:p></o:p></span></p>
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<span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Many milestones have been achieved by AEgIS in the last few years, on the way of developing a pulsed cold antihydrogen source using resonant charge-exchange between antiprotons and cold Rydberg
positronium. Cold positronium was first formed at room temperature in a dedicated setup. The spectroscopy of its 1-3 and 3-14/15/16 transitions was carried out, demonstrating the feasibility of AEgIS' proof-of-concept in-flight laser excitation. Positronium
was subsequently formed from the target at ~10K temperature inside the 1T magnetic field of the experiment and laser excitation was shown possible again. In parallel, antiprotons were captured from the A.D. using aluminum degraders and cooled with electrons.
These mixed e-/p+ plasma were radially compressed to sub-mm radii applying a rotating-wall drive and progressively reducing the number of cooling electrons. Antiprotons were finally transferred to the antihydrogen production trap with high efficiency using
an in-flight launch and recapture procedure.<o:p></o:p></span></p>
<p class="MsoNormal">We hope to see you there!<o:p></o:p></p>
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<p class="MsoNormal"><img width="224" height="45" style="width:2.3333in;height:.4687in" id="Picture_x0020_1" src="cid:image001.png@01D43BAF.3AD61050" alt="The Ohio State University"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#333333"><br>
</span><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#BB0000;background:white">Kyle Schechter</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#333333">, Fiscal</span><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:#333333">
Associate<br>
</span><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:#BB0000;background:white">Department of Physics</span><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:#333333"><br>
4112 Physics Research Building | 191 West Woodruff Avenue Columbus, OH 43210<br>
614-292-7260 Office <br>
</span><b><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:blue;background:white"><a href="mailto:Schechter.19@osu.edu"><span style="color:blue">Schechter.19@osu.edu</span></a></span></b><b><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:#333333;background:white">
</span></b><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:#333333"><a href="http://osu.edu/" target="_blank"><b><span style="color:blue;background:white">osu.edu</span></b></a></span><o:p></o:p></p>
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