Parameter Report for North Telescope LSTN-02 (Version 5.0.0)

LSTN-02

Parameter Name	Values	Short Description
pixeltrg_time_step	0.0 ns	Time difference between telescope and pixel trigger recording.
focus_offset	[<Quantity 6.55 cm>, <Quantity 0. deg>, <Quantity 0.>, <Quantity 0.>]	Distance of the starlight focus from the camera pixels (light guides)
entry.
discriminator_scale_threshold	1.0	Discriminator/comparator threshold scale factor.
qe_variation	0.03	None
nsb_pixel_rate	[0.244985 0.244985 0.244985 … 0.244985 0.244985 0.244985] GHz	Number of photo-electrons per nanosecond per pixel due to nightsky
background.
photon_delay	19.0 ns	None
discriminator_var_sigsum_over_threshold	0.0 mV ns	None
discriminator_threshold	99999.0 mV	None
focal_length	2800.0 cm	Nominal overall focal length of the entire telescope.
fadc_bins	75	Number of FADC bins to be simulated.
fadc_lg_pedestal	400.0 ct	None
mirror_class	0	Parameter to control the type of mirror used (DC, parabolic or SC).
asum_clipping	9999.0 mV	None
mirror_list	mirror_CTA-N-LST2_v2020-04-07.dat	None
fadc_lg_err_pedestal	0.3 ct	Assumed error in initial calibration of pedestal
(low-gain channels; affects only the reported pedestal).
fadc_lg_noise	5.7 ct	Gaussian r.m.s. spread of white noise per time bin in digitisation (low-gain channels).
camera_transmission	1.0	Global wavelength-independent transmission factor of the camera,
including any plexiglass window.
fadc_max_sum	16777215.0 ct	The maximum value of a pulse sum produced by hardware pulse summation,
in sum mode rather than recording pulse samples.
flatfielding	True	None
fadc_sum_offset	9	Number of bins before telescope trigger where summing or reading of
sampled data starts.
nsb_offaxis	[<Quantity 0.>, <Quantity 0.>, <Quantity 0. cm>, <Quantity 0.>, <Quantity 0.>]	Fall-off of NSB with off-axis angle due to off-axis angle-dependent
effective optical area.
camera_body_shape	2	Camera body shape parameter (used to account for effects of shadowing).
discriminator_output_amplitude	42.0 mV	The nominal output amplitude of a pixel discriminator as seen at the
trigger group coincidence unit.
fadc_amplitude	25.0 ct	Peak amplitude above pedestal for a photo electron with average signal.
discriminator_pulse_shape	pulse_LST_8dynode_pix6_20200204.dat	None
nsb_autoscale_airmass	[<Quantity 0.84>, <Quantity 0.29>]	NSB scaling as function of airmass (zenith angle).
optics_properties	ray-tracing-North-LST-1-d10.0-za20.0_validate_optics.ecsv	None
gain_variation	0.0187	Fractional gain variation between different photo detectors after
adjusting the voltage to have approximately the same gain in all channels.
discriminator_output_var_percent	10.0 %	Channel-to-channel variation (Gaussian r.m.s.) of the output amplitude
of a pixel discriminator.
mirror_reflectivity	ref_LST_2020-04-23.dat	None
hg_lg_variation	0.0	None
fadc_noise	6.7 ct	Gaussian r.m.s. spread of white noise per time bin in digitisation.
asum_threshold	270.0 mV	None
disc_bins	68	Number of time bins used for the discriminator simulation.
transit_time_calib_error	0.0 ns	None
fadc_var_pedestal	0.4 ct	None
telescope_transmission	[<Quantity 0.969>, <Quantity 0.>, <Quantity 0.>, <Quantity 0.>, <Quantity 0.>, <Quantity 0.>]	Off-axis angle-dependent transmission, accounting for absorption and
shadowing by masts.
discriminator_fall_time	1.0 ns	Fall time of the discriminator output after the logical output is
reset to false.
fadc_pulse_shape	pulse_LST_8dynode_pix6_20200204.dat	(F)ADC pulse shape (amplitude vs time).
fadc_pedestal	400.0 ct	None
telescope_random_angle	0.0 deg	None
telescope_sphere_radius	12.5 m	Telescope fiducial sphere radius.
fadc_max_signal	4249.0 ct	Maximum value of digitized signal per sample.
discriminator_var_threshold	0.2 mV	Channel-to-channel variation of discriminator threshold.
effective_focal_length	[2930.57 0. 0. 0. 0. ] cm	Effective focal length.
Only to be used for image analysis, has no effect on the simulation.
camera_degraded_map	None	Position-dependent map of degradation factors for the camera efficiency.
pm_transit_time	[<Quantity 20.89 ns>, <Quantity 9. ns>, <Quantity 350. V>, <Quantity 1135. V>]	None
trigger_pixels	3	Number of pixels required for single telescope trigger.
camera_config_file	camera_CTA-LST-234_analogsum21_v2020-04-14.dat	None
disc_start	3	Number of time bins by which the discriminator simulation is ahead of
the FADC readout.
pm_average_gain	40000.0	None
fadc_sum_bins	40	Number of bins read out in sampled data or summed up in ADC sum data.
Corresponds to the experimental length of the readout window.
mirror_focal_length	0.0 cm	Standard focal length of mirror tiles.
discriminator_var_time_over_threshold	0.1 ns	None
array_element_position_utm	[2.17542210e+05 3.18503361e+06 2.17400000e+03] m	UTM coordinate position of an array element.
teltrig_min_sigsum	7.8 mV ns	Minimum signal sum at sector trigger over threshold.
mirror_reflection_random_angle	[<Quantity 0.0075 deg>, <Quantity 0.125>, <Quantity 0.037 deg>]	Gaussian r.m.s. spread of random fluctuations of microscopic reflection
angles due to small-scale surface deviations.
fadc_sysvar_pedestal	0.04 ct	Systematic common variations of pedestals.
camera_degraded_efficiency	1.0	Camera efficiency degradation factor (wavelength independent).
array_element_position_ground	[-35.27 66.14 32. ] m	Ground coordinate position of an array element.
fadc_err_pedestal	0.5 ct	Assumed error in initial calibration of pedestal
(affects only the reported pedestal).
asum_offset	0.0 ns	None
transit_time_compensate_step	0.0 ns	None
discriminator_sigsum_over_threshold	0.0 mV ns	Integrated signal required over threshold.
mirror_align_random_horizontal	[<Quantity 0.0039 deg>, <Quantity 28. deg>, <Quantity 0.>, <Quantity 0.>]	Gaussian r.m.s. spread of random fluctuations of the mirror alignment
angle with respect to nominal alignment in the horizontal component.
axes_offsets	[<Quantity 0. cm>, <Quantity 0. cm>]	Geometric offsets to be used in case that the azimuth, altitude,
and optical axes do not intersect at the reference point.
mirror_degraded_reflection	1.0	Mirror degradation factor (wavelength independent).
mirror_align_random_vertical	[<Quantity 0.0039 deg>, <Quantity 28. deg>, <Quantity 0.>, <Quantity 0.>]	Gaussian r.m.s. spread of random fluctuations of the mirror alignment
angle with respect to nominal alignment in the vertical component.
teltrig_min_time	0.5 ns	None
fadc_lg_compensate_pedestal	-1	Emulation of FADC pedestal compensation.
fadc_compensate_pedestal	-1	Emulation of FADC pedestal compensation.
default_trigger	AnalogSum	None
fadc_lg_max_signal	4288.0 ct	Maximum value of digitized signal per sample (low-gain channels).
quantum_efficiency	qe_lst2-4_20200318_high+low.dat	None
mirror_align_random_distance	0.0 cm	None
discriminator_gate_length	2.0 ns	Effective discriminator gate length.
fadc_var_sensitivity	0.01416	None
fadc_lg_err_compensate_pedestal	-1.0	R.M.S. error on the pedestal evaluation for the compensation step.
channels_per_chip	4	Number of channels per readout chip.
fadc_err_compensate_pedestal	0.0	R.M.S. error on the pedestal evaluation for the compensation step.
transit_time_compensate_error	0.0 ns	None
mirror_offset	93.25 cm	Offset of mirror back plane from fixed point of telescope mount or
from the altitude rotation axis, along the direction of the optical axis.
discriminator_rise_time	1.0 ns	Rise time of the discriminator output. The output signal rises linearly
within time frame.
fadc_ac_coupled	True	AC coupling of the FADCs.
camera_depth	0.0 cm	Depth of the camera body (used to account for effects of shadowing).
discriminator_time_over_threshold	1.5 ns	Time over threshold required before logic response switches to true.
dish_shape_length	2800.0 cm	Dish curvature length, best equal to focal length.
random_focal_length	[<Quantity 0. cm>, <Quantity 0. cm>]	The spread of random fluctuations in mirror focal lengths.
fadc_mhz	1024.0 MHz	None
trigger_current_limit	20.0 uA	None
fadc_lg_var_sensitivity	-1.0	None
fadc_lg_sysvar_pedestal	-1.0 ct	Systematic common variations of pedestals (low-gain channels).
parabolic_dish	True	Parabolic dish shape is used.
pm_voltage_variation	0.03	Fractional high voltage variation, used to adjust the transit time
variations (\(\propto 1/\sqrt(V)\)).
telescope_axis_height	16.0 m	None
fadc_lg_amplitude	1.28 ct	Peak amplitude above pedestal for a photo electron with average signal (low-gain channels).
discriminator_var_gate_length	0.1 ns	Variation of gate length (Gaussian r.m.s).
transit_time_jitter	0.7 ns	None
asum_shaping	None	None
discriminator_hysteresis	0.0 mV	Value of the discriminator hysteresis.
fadc_sensitivity	1.0 ct / mV	FADC counts per mV voltage.
telescope_random_error	0.0 deg	None
camera_filter	transmission_lst_window_No7-10_ave.dat	Wavelength dependence of the camera transmission, possibly as a function
of incidence angle.
discriminator_amplitude	6.5 mV	None
trigger_delay_compensation	[<Quantity 0. ns>, <Quantity 0. ns>, <Quantity 0. ns>, <Quantity 0. ns>]	The delay applied to the trigger output to compensate for the different
execution times of each trigger algorithm.
disc_ac_coupled	True	Control AC coupling of the discriminators.
transit_time_error	0.0 ns	Errors (r.m.s.) in transit time, not related to high voltage.
camera_pixels	1855	None
multiplicity_offset	-0.5	Actual threshold of the telescope trigger, adjusted relative to the
number of required pixels.
pm_gain_index	3.92	None
only_triggered_telescopes	True	Switch to read out non-triggered telescopes.
pm_collection_efficiency	1.0	Photoelectron collection efficiency at the first stage of the photo
detector.
pm_photoelectron_spectrum	spe_LST_2020-05-09_AP2.0e-4.dat	None
fadc_lg_var_pedestal	0.4 ct	None
fadc_lg_sensitivity	-1.0 ct / mV	FADC counts per mV voltage (for low-gain channels).
num_gains	2	None
lightguide_efficiency_vs_incidence_angle	CTA-LST_lightguide_eff_2020-04-12_average.dat	Lightguide efficiency as a function of incidence angle.
camera_body_diameter	348.0 cm	None