Resolution is the sum of a constant term (electronic resolution), a term proportional to the square root of energy (natural statistics of germanium electron/hole pairs), and a term proportional to energy (trapping).
resolution(E) = sqrt ( A^2. + (B*sqrt(E))^2. + (C*E)^2. )
The values of A, B, and C for each detector segment are read from a table of parameters vs dates (hessi_resol_vs_time.1000) and interpolated to the requested date. The units of the resolution are FHWM in keV of a gaussian line.
The following plots show the calculated RHESSI detector FWHM resolution as a function of both time and energy. These are the resolutions used in calculating the spectral response matrix in the RHESSI software.
For questions about the RHESSI Detectors, please contact David Smith.
PLOTS:
Front Segments at: start of mission
2008 2016
Rear Segments at: start of mission
2008 2016
Front Segment history at: 10 keV
150 keV
Rear Segment history at: 200 keV
15 MeV
Notes
IDL COMMAND: hsi_plot_resolutions,time='20-feb-2002',xstyle=1, /png,filename='res_2002_front.png'
IDL COMMAND: hsi_plot_resolutions,time='1-oct-2008',xstyle=1, /png,filename='res_2008_front.png'
IDL COMMAND: hsi_plot_resolutions,time='1-jan-2016',xstyle=1, /png,filename='res_2016_front.png'
IDL COMMAND: hsi_plot_resolutions,/rear,xstyle=1, time='20-feb-2002', energy=findgen(1001)*20.+200, /png,filename='res_2002_rear.png'
IDL COMMAND: hsi_plot_resolutions,/rear,xstyle=1, time='1-Oct-2008', energy=findgen(1001)*20.+200, /png,filename='res_2008_rear.png'
IDL COMMAND: hsi_plot_resolutions,/rear,xstyle=1, time='1-jan-2016', energy=findgen(1001)*20.+200, /png,filename='res_2016_rear.png'
IDL COMMAND: hsi_plot_res_history,energy=10,ystyle=1,xstyle=1,/png,filename='res_history_10keV_front.png'
smaller y range
IDL COMMAND: hsi_plot_res_history,energy=150,ystyle=1,xstyle=1,/png,filename='res_history_150keV_front.png'
smaller y range:
IDL COMMAND: hsi_plot_res_history,energy=200,/rear,xstyle=1,/png,filename='res_history_200keV_rear.png'
smaller y range:
IDL COMMAND: hsi_plot_res_history,energy=15000,/rear,xstyle=1,/png,filename='res_history_15000keV_rear.png'
smaller y range:
Last edited 04 January 2016 by Kim Tolbert