Browsing by Author "Schwartz, R."

Now showing 1 - 5 of 5
  • Thumbnail Image
    Item
    14C and 10Be dated Late Holocene fluctuations of Patagonian glaciers in Torres del Paine (Chile, 51°S) and connections to Antarctic climate change
    (2020) García B., Juan Luis; Hall, B. L.; Kaplan, M. R.; Gomez, G. A.; De Pol Holz, R.; Garcia, V. J.; Schaefer, J. M.; Schwartz, R.
  • No Thumbnail Available
    Item
    ECFA Detector R&D Panel, Review Report
    Abramowicz, H.; Abusleme Hoffman, Angel Christian; Afanaciev, K.; Aguilar, J.; Álvarez, E.; Bambade, P.; Bortko, L.; Bozovic-Jelisavcic, I.; Castro, E.; Chelkov, G.; Coca, C.; Daniluk, W.; Dragone, A.; Dumitru, L.; Elsener, K.; Emeliantchik, I.; Firu, E.; Fischer, J.; Fiutowski, T.; Ghenescu, V.; Gostkin, M.; Grzelak, G.; Haller, G.; Henschel, H.; Ignatenko, A.; Idzik, M.; Ito, K.; Kananov, S.; Kielar, E.; Kollowa, S.; Kotula, J.; Krumstein, Z.; Krupa, B.; Kulis, S.; Lange, W.; Levy, A.; Levy, I.; Linssen, L.; Lohmann, W.; Lukic, S.; Moron, J.; Moszczynski, A.; Nauenberg, U.; Neagu, A.; Novgorodova, O.; Nuiry, F.X.; Ohlerich, M.; Orlandea, M.; Oleinik, G.; Oliwa, K.; Olshevski, A.; Pandurovic, M.; Pawlik, B.; Preda, T.; Przyborowski, D.; Sato, Y.; Sadeh, I.; Sailer, A.; Schumm, B.; Schuwalow, S.; Schwartz, R.; Smiljanic, I.; Swientek, K.; Takubo, Y.; Teodorescu, E.; Wierba, W.; Yamamoto, H.; Zawiejski, L.; Zgura, T.S.; Zhang, J.
    Two special calorimeters are foreseen for the instrumentation of the very forward region of an ILC orCLIC detector; a luminometer (LumiCal) designed to measure the rate of low angle Bhabha scatteringevents with a precision better than 10−3 at the ILC and 10−2 at CLIC, and a low polar-angle calorimeter (BeamCal). The latter will be hit by a large amount of beamstrahlung remnants. The intensity and the spatial shape of these depositions will provide a fast luminosity estimate, as well as determination of beam parameters. The sensors of this calorimeter must be radiation-hard. Both devices will improve the e.m. hermeticity of the detector in the search for new particles. Finely segmented and very compact electromagnetic calorimeters will match these requirements. Due to the high occupancy, fast front-end electronics will be needed. Monte Carlo studies were performed to investigate the impact of beam-beam interactions and physics background processes on the luminosity measurement, and of beamstrahlung on the performance of BeamCal, as well as to optimise the design of both calorimeters. Dedicated sensors, front-end and ADC ASICs have been designed for the ILC and prototypes are available. Prototypes of sensor planes fully assembled with readout electronics have been studied in electron beams.
  • No Thumbnail Available
    Item
    Holocene glacier behavior around the northern Antarctic Peninsula and possible causes
    (2020) Kaplan, M. R.; Strelin, J. A.; Schaefer, J. M.; Peltier, C.; Martini, M. A.; Flores, E.; Winckler, G.; Schwartz, R.
    We obtained 49 new Be-10 ages that document the activity of the former Northern Antarctic Peninsula Ice Sheet, and subsequently the James Ross Island Ice Cap and nearby glaciers, from the end of the last glacial period until the last similar to 100 years. The data indicate that from >11 to similar to 8 ka marked recession of glacier systems occurred around James Ross Island, including tidewater and local land-terminating glaciers. Glaciers reached heads of bays and fjords by 8-7 ka. Subsequently, local glaciers were larger than present around (at least) 7.5-7 ka and similar to 5-4 ka, at times between 3.9 and 3.6 ka and just after 3 ka, between similar to 2.4 and similar to 1 ka, and from similar to 300 to similar to 100 years ago. After deglaciation, the largest local glacier extents occurred between similar to 7 ka and similar to 4 ka.
  • Thumbnail Image
    Item
    Holocene glacier fluctuations in Patagonia are modulated by summer insolation intensity and paced by Southern Annular Mode-like variability
    (2019) Reynhout, S.A.; Sagredo T., Esteban; Kaplan, M.R.; Aravena, J.C.; Martini, M.A.; Moreno, P.I.; Rojas, M.; Schwartz, R.; Schaefer, J.M.
  • Thumbnail Image
    Item
    Patagonian and southern South Atlantic view of Holocene climate
    (2016) Kaplan, M. R.; Schaefer, J. M.; Strelin, J.A.; Denton, G. H.; Anderson, R. F.; Finkel, R. C.; Schwartz, R.; García, Juan Luis; Martini, M. A.; Nielsen, S. H. H.