9 research outputs found
RF Conditionning of the Spiral 2 CW RFQ
No full textInternational audienceThe SPIRAL2 RFQ is designed to accelerate light and heavy ions with A/Q from 1 to 3 at 0.73 MeV/A. The nominal beam intensities are up to 5 mA CW for both proton and deuteron beams and up to 1 mA CW for heavier ions. The four-vane cavity is made with 5 1-meter long sections mechanically assembled, it works at 88 MHz and is powered up to 180 kW CW to achieve the nominal vane voltage of 113.7 kV for A/Q = 3 ions. This paper describes the RF conditioning of the RFQ at GANIL with the setting of its RF systems and cooling system used to tune the cavity resonance frequency
Impact Seismology: A Search for Primary Pressure Waves Following Impacts A and H
No full textInternational audienceThis paper reports part of the seismic observations performed after the impacts of Shoemaker–Levy 9 fragments A and H with the mid-IR camera TIMMI at the ESO 3.6-m telescope. Hodograms have been computed to search for the seismic signature of the primary waves crossing the planet within 2 hr following each impact. The hodogram analysis has been unable to detect any seismic signal. In order to put a limit on the kinetic energy of the fragments, the synthetic thermal signature of the primary wave has been calculated as a function of the incident energy, according to theoretical simulations, and taking into account observational conditions such as the point spread function. The non-detection implies that the kinetic energy of impacts A and H was less than 2 × 1021J, within the frame of the theoretical simulation of Lognonnéet al.(Lognonné, Ph., B. Mosser, and F. Dahlen 1994.Icarus110, 180–195.). The error bar is as large as one order of magnitude, according to other simulations. The seismic wave should have contributed to a non-negligible part of the heating of the region surrounding the impacts, but it is not yet possible to measure its contribution
RF Commissioning of the SPIRAL2 RFQ in CW Mode and Beyond Nominal Field
No full textInternational audienceThe SPIRAL2 RFQ was recently successfully commissioned at nominal voltage of 114 kV, corresponding to 1.65 Kilpatrick factor. The paper describes limitations of the RFQ main subsystems, cavity conditioning difficulties, as well as changes implemented in the LLRF and automatic procedures to simplify turn on and operation of the whole system
CERES, the CarboEurope Regional Experiment Strategy in les Landes, South West France, May-June 2005
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