diff options
| author | Thomas White <taw@physics.org> | 2009-11-27 15:18:24 +0100 |
|---|---|---|
| committer | Thomas White <taw@physics.org> | 2009-11-27 15:18:41 +0100 |
| commit | 7fb6226e91449278537f4bf71a8ccd35cda02e02 (patch) | |
| tree | c8c7bc43ef2140417601b6c89395e3ee03b9b484 | |
| parent | 9e3ebf0fd97a3a2d47093a8da9fa2d55f57394a9 (diff) | |
Signal decreases with increasing probe size
| -rw-r--r-- | src/detector.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/src/detector.c b/src/detector.c index 23378e90..52f24b1e 100644 --- a/src/detector.c +++ b/src/detector.c @@ -20,8 +20,8 @@ #include "diffraction.h" -/* Pulse energy density in J/m^2 */ -#define PULSE_ENERGY_DENSITY (30.0e7) +/* Number of photons in pulse */ +#define FLUENCE (1.0e13) /* Detector's quantum efficiency */ #define DQE (0.9) @@ -144,7 +144,7 @@ static uint16_t *bloom(double *hdr_in, int width, int height) void record_image(struct image *image) { int x, y; - double fluence; + double total_energy, energy_density; double ph_per_e; double pix_area, Lsq; double area; @@ -152,10 +152,13 @@ void record_image(struct image *image) /* How many photons are scattered per electron? */ area = M_PI*pow(BEAM_RADIUS, 2.0); - fluence = PULSE_ENERGY_DENSITY / image->xray_energy; - ph_per_e = fluence * pow(THOMSON_LENGTH, 2.0); - printf("Fluence = %5e photons / m^2, %5e photons total\n", - fluence, fluence*area); + total_energy = FLUENCE * image->xray_energy; + energy_density = total_energy / area; + ph_per_e = (FLUENCE/area) * pow(THOMSON_LENGTH, 2.0); + printf("Fluence = %8.2e photons, " + "Energy density = %5.3f kJ/cm^2, " + "Total energy = %5.3f microJ\n", + FLUENCE, energy_density/1e7, total_energy*1e6); /* Area of one pixel */ pix_area = pow(1.0/image->resolution, 2.0); |