urn:esa:psa:context:instrument:uly.hiscale-lefs 1.0 1.20.0.0 Product_Context HISCALE LEFS 2023-08-02 1.0 Initial version. urn:esa:psa:context:instrument_host:spacecraft.uly instrument_to_instrument_host Armstrong, T.P., and R. Sahi, Ulysses HISCALE Data Analysis Handbook, Dept. of Physics and Astronomy, Univ. of Kansas, Lawrence, KS, 66045, April 1996. reference.ARMSTRONG-SAHI1996 Armstrong, T.P., Passbands & Efficiencies for LEMS, LEFS and WART Channels, University of Kansas, May 1992. reference.ARMSTRONG1992 Lanzerotti, L.J., R.E. Gold, K.A. Anderson, T.P. Armstrong, R.P. Lin, S.M. Krimigis, M. Pick, E.C. Roelof, E.T. Sarris, G.M. Simnett, and W.E. Frain, Heliosphere instrument for spectra, composition and anisotropy at low energies, Astron. Astrophys. Suppl. Ser. 92, 349-363, 1992. reference.LANZEROTTIETAL1992 Maclennan C.G., and Armstrong T.P., LAN Cover-Close Calibrations, AT&T Bell Laboratories, May 1995. reference.MACLENNAN-ARMSTR1995 Maclennan, C.G., User's Guide to LAN 360, AT&T Bell Laboratories, Aug. 1992. reference.MACLENNAN1992 Tappin, S.J., HISCALE IDL display System (IDL-HS), University of Birmingham, June 1992. reference.TAPPIN1992 Townsend, J.P. Jr., Ulysses Pulse Height Analysis documentation, JHU, Applied Physics Laboratory, July 1990. reference.TOWNSEND1990 HISCALE Low-Energy Foil Spectrometer Charged Particle Detector not applicable not applicable Instrument Overview =================== (adapted from: Lanzerotti, et al. 1992) The are Low-Energy Foil Spectrometers (LEFS) provide pulse-height-analyzed single-detector measurements with active anticoincidence. The foil thickness, detector thicknesses, and electronic thresholds were selected to enable the separation of low energy electron and ion fluxes at high sensitivity by comparing detector responses. The individual LEFS telescopes are referred to as LEFS 60, and LEFS 150, where the number indicates the inclination of the telescope axis with respect to the spacecraft spin axis. The MF, M' F', and BC detector pairs (Tab. 1) are identical (for ease of replacement pre-flight); each consists of two equal 200 micrometer thick, totally depleted silicon surface barrier detectors. The D detector is a thin (5 micrometer) silicon detector of the epitaxial type. The orientations of the telescope axes are such that there is nearly a complete 41r coverage of the unit sphere during one complete spacecraft spin. In the LEFS 60 and LEFS 120 telescopes, a thin ( ~0.35 mg cm-2) aluminized parylene foil prevents ions (~350 keV) from reaching the F and F' detector, while electrons (~30 keV) can penetrate the foil with little energy loss. The logic and energy channels for both LEFS telescopes are listed in Table 2. Both telescopes also have a geometrical factor of ~0.48 cm2 sr. TABLE 2. LEFS detector systems. Accum. timc(s) Channel Logic Passband[a] Sectors @ 1024 bit/s ------------------------------------------------------------------------------------------ LEFS 150[b] El Fl F2 M 30-50 ke V electrons 4[b],8[c] 3[b],1.5[c] (M,F) E2 F2 F3 M 50-90 ke V electrons 4[b],8[c] 3[b],1.5[c] LEFS 60[c] E3 F3 F4 M 90-165 keV electrons 4[b],8[c] 3[b],1.5[c] (M',F') E4 F4 F5 M 165-300 keY electrons 4[b],8[c] 3[b],1.5[c] FPS F5 F6 M 300-550 ke V ions 4[b],8[c] 6[b],3[c] ~ 0.48 cm2 sr FP6 F6 F7 M 550-1.0 Me V ions 4[b],8[c] 6[b],3[c FP7 F7 M 1.0-5.0 MeV ions 4[b],8[c] 6[b],3[c Singles Sl Det. B,C,D 12 S2 Det. M,F,M',F' 12 ------------------------------------------------------------------------------------------ [a] The passbands given here are provisional and subject to refinement as in-flight calibrations arc completed. [b] Sector; and accumulation times designated with b are associated with the LEFS 150 system. [c] Sectors and accumulation times designated with c are associated with the LEFS 60 system. References ---------- HISCALE References (cited in Armstrong & Sahi, 1996) Curtis, D.W., ISPM/Ulysses LAN Data Processing Software Status, Dec. 1986. Gold R.E., LAN Accelerator Calibration Test Plan, August 1991. Guynn D.R. Jr., LAN Experiment Data System Performance and Interface Specification, June 1992. Kohl, J.W., J.H. Crawford, Calibration of Solar Polar Energy Model LAN-2B Detector Head at GSFC Low Energy Accelerator, July 1986. Simnett, G.M., R.E. Gold, The RTG Background in the LAN Experiment and the Shielding Required to Control It, April 1980. Tappin, S.J., HSIO-HiScale I/O Library, June 1991. Ximenez de Ferran S., Ulysses Spin Reference Pulse, May 1985.