Physics – Plasma Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm51b1635h&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM51B-1635
Physics
Plasma Physics
7800 Space Plasma Physics, 7831 Laboratory Studies And Experimental Techniques, 7894 Instruments And Techniques
Scientific paper
Strong HF radar backscatter echoes are well-known characteristics of the polar cusp region by the ground- based observation of HF radar in the polar ionosphere. The gradient drift instability is regarded as a dominant mode for producing backscatter targets. According to Moen et al. [2002], decameter scale measurement that cannot be achieved by ground-based and satellite observations is required to understand the generation mechanism. Norwegian sounding rocket experiment ICI-2(Investigation of Cusp Irregularities) is proposed in order to single out the mechanism(s) running cusp ionospheric plasma unstable and facilitate backscatter targets for HF radars. The ICI-2 rocket will be launched into cusp ionosphere from Svalbard, Norway in Nov/Dec 2008. We are responsible for developing a low energy particle electron spectrum analyzer (LEP-ESA) that is one of the science payloads onboard the ICI-2 sounding rocket. LEP-ESA covers the energy range between 10eV and 10keV. We designed LEP-ESA to achieve high spatial resolution of ~10m/energy spectrum (16 energy steps). We have confirmed the performance of LEP-ESA by experiments as well as numerical simulations. In order to realize the high spatial resolution, high time resolution is required. For the purpose of high time resolution measurement of low energy electrons we have newly developed an electron detector that consists of Z-stack MCPs (Micro Channel Pates) and 64-channel multi-anode. An ASIC (Application Specific Integrated Circuit) with 64-channel fast preamplifiers and counters are installed on the backside of the anode. Since the detected electrons are independently counted by 64 separated anodes, multi-anode can achieve the higher time resolution than any other position sensitive anodes. One of the most severe problems in using a multi- anode is the size of the required electronics that becomes unacceptably large for the sounding rocket / satellite instrument when the number of the channels is large. By using the newly developed multi-anode with ASIC we have succeeded in solving this problem. ICI-2 sounding rocket experiment has great importance from the viewpoint of flight verification of the newly developed detector. In the present study, characteristics of the analyzer that has been studied with laboratory experiments as well as numerical simulations and performance of the MCP multi-anode with ASIC are shown. We also expect to present initial report of the flight performance of LEP-ESA.
Asamura Kazushi
Harada Masaaki
Kasahara Satoshi
Saito Masao
Saito Yukio
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