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SPSC108 summary for IEFC Part 2. Lau Gatignon / EN, S.Maury / BE. Open Session: AEGIS, ACE, GBAR, ASACUSA, ATRAP, ALPHA Closed Session: BASE , SBL, AWAKE, CHIC,DIRAC, CLOUD, COMPASS, NA61 , NA62, NA63, OPERA, ICARUS, CAST, OSQAR, UA9 . AEgIS.
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SPSC108 summary for IEFCPart 2 Lau Gatignon / EN, S.Maury / BE Open Session: AEGIS, ACE, GBAR, ASACUSA, ATRAP, ALPHA Closed Session: BASE, SBL, AWAKE, CHIC,DIRAC, CLOUD, COMPASS, NA61,NA62, NA63, OPERA, ICARUS, CAST, OSQAR, UA9
AEgIS AEgIS installed the Ps laser excitation system, commissioned the 5T magnet (in May) and measuredthe cold antiproton lifetime and observed annihilation on the 1T system.They demonstrated the Moiré deflectometer operation with antiprotons. The SPSC congratulates the AEgIS collaboration for the successful installation of its baseline apparatus in the AD hall and its commissioning with positrons and antiprotons. The SPSC supports the detailed plans of the collaboration to further commission and optimize their apparatus in the coming year with positrons and electrons and to supplementit with a proton source and a hydrogen detection system. AEgIS, as well as all other AD experiments, count on having water cooling available at a quasi-continuous basis. Summary SPSC108
ACE ACE still suffers from systematic effects between different datasets and from differences betweendifferent FLUKA versions. However, with the insertion of the 2012 data, the dataset has thepotential to become as precise as the existing datasets for proton and Carbon. ACE has completed its data-taking and any additional data would require a new proposal.Still have to work out scenarios for pbar cancer therapy and treatment plans. The SPSC congratulates the ACE collaboration for obtaining two independent data sets of cell survival probabilities in 2012 thereby completing its data taking at the AD. The committee urges the collaboration to investigate all systematic effects associated with the individual data sets and to present a combined RBE value for antiprotons. The SPSC expects a final document summarising the potential of antiproton cancer therapy in the overall landscape of hadron therapy. Plea from M.Holzscheiter: Please keep the capability to deliver MeV beams of antiprotons to a dedicated target station for such experiments and many other potential users of “high” energy antiprotons available. Summary SPSC108
GBAR (Gravitational Behaviour of Antihydrogen at Rest) GBAR aims to measure the gravitational constant for anti-Hydrogen, complementary to AEgiS. Work on the p-bar decelerator and focusing is ongoing. Ae+ test beam line/demonstrator is operational, including line for Ps production tests and calculations of H-bar production on Ps (excited states) are ongoing For 2013 they plan: e+ trapping, installation of a laser system to study Ps excitation,the design of an anti-H reaction chamber, setup of a 313 nm laser source for Be+ cooling and the design and implementation of a Q-bender and linear trap for H+ A 18 MeV linacwill be built by NCBJ in 2013 (if funding found: clone at CERN in 2014-2015) Several proposals for funding submitted, a Conceptual Design Report and aMoU are in progress. The SPSC notes with pleasure the progress of several important parts of the GBAR experiment and looks forward to the conceptual design report. Summary SPSC108
ATRAP ATRAP made a very precise measurement of the antiproton magnetic moment, at the 5 10-6 level.They consider that there is still room for further improvement by a factor 103 or 104. However, due to unforeseen problems with Silver-Titanium welds and a leak on the new cryostat,there was no progress on anti-Hydrogen experiments. The committee congratulates the ATRAP collaboration on achieving the impressive measurement of the antiproton magnetic moment and the resulting CPT test. The committee notes that the collaboration is starting the construction of the new vacuum system for the second generation Ioffe trap. The committee looks forward to the new Ioffe trap apparatus and the double-trap magnetic moment experiment both being ready for use with antiprotons at the end of the shutdown. Summary SPSC108
ASACUSA ASACUSA took advantage of the installation activities in the other experiments to take more shifts. They further improved the antiproton to electron mass ratio and two-photon spectroscopy ofcold pbar-He. They also continued to improve theirCUSP set-up for anti-Hydrogen physics and extended theirnuclear collision cross sections to much lower energies (130 keV) at high precision. Several members of the collaboration received prestigious grants and the Japanese funding for ELENA was secured. The committee congratulates ASACUSA for the progress achieved in the antiprotonic Helium spectroscopy in single photon transitions and the improved spectral resolution in two-photon transitions which will lead to an improved precision on the antiproton mass. The committee notes with pleasure the developments towards production of antihydrogen beams to be exploited after long shutdown LS1 and the observation of the first anti-nucleus annihilation in flight at very low energy (130 keV). Summary SPSC108
ALPHA They published the first measurement of anti-Hydrogen in Nature in March. In 2012 the main emphasis was the installation of ALPHA-2, allowing to do physics withthe trapped Hbar, after having demonstrated the trapping with ALPHA-1. The main goal forthis year was to see first results before LS1, to allow an iteration if necessary.Unfortunately they suffered from a leak in the cryostat when it arrived in October . The new ‘Carlsberg magnet’ arrived in November. They could manage to trap antiprotonsin the atom trap, but the cryo-leak prevented cold operation. In LS1 they will fix the cryostat problem and continue commissioning with electrons and positrons.Like the other experiments at AD, they need water, lHe and power. The SPSC congratulates the ALPHA collaboration for the first successful demonstration of spectroscopy of the antimatter atom. The SPSC committee notes with pleasurethe rapid installation of the ALPHA-2 facility during 2012and takes note of detailed plans of the collaboration for further optimization of the apparatus during the coming shutdown. Summary SPSC108
GENERAL REMARKS ON THE AD PROGRAM The SPSC notes that open questions remain on the availability of supplies and services at the AD during the long shutdown LS1. The committee reiterates its recommendation from SPSC104 to ensure that all efforts are made to keep the services to the experiments during LS1 operational as far as possible to allow further commissioning of the apparatuses. For the next annual review from each of the AD Collaborations, the committee requests a document containing the description of their upgraded experimental apparatus after the long shutdown LS1 together with the plans for further upgrades. Summary SPSC108
BASE The Committee received a detailed technical Design Report from the collaboration, describing the proposed measurement of the antiproton magnetic moment to ultimatelya precision of ~10-9. The experiment is complementary to ATRAP which presented a measurementat this meeting. A candidate location has been identified in the AD hall, just under the old ATRAP control room. All costs can be covered by the collaboration (including the 750 kCHF for the new beam line), but the CERN manpower remains to be defined. The Committee aims to come to a conclusion at the next meeting, as it is important to cometo a conclusion rapidly in view of the competition with ATRAP. The SPSC welcomes the TDR (SPSC-TDR-002;) from the BASE Collaboration and appreciates the opportunity offered to measure the antiproton magnetic moment with a 10-9 precision. The committee continues to review the proposed programme. The committee will continueto review the proposal. Summary SPSC108
NA61/SHINE Thanks to the BE and EN teams! Summary SPSC108
NEW ACTION ITEMS Summary SPSC108
STILL OPEN ITEMS Summary SPSC108
