# 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 |