Update to SiPM-on-Tile ZDC digitization parameters

[bschmookler]

Briefly, what does this PR introduce?

This PR updates the digitization parameters for the SiPM-on-Tile ZDC. The current default parameters place a zero-suppression threshold at 40 ADC channels. With a 15-bit ADC with dynamic range of 800 MeV, this is a cut at 0.98 MeV (~ 2 MIPs). We see that this has an impact on the energy reconstruction for single-particle simulations.

This PR changes following values:

ADC Capacity = 16-bit (65536 channels)
DynamicRange = 1000 MeV (0.015 MeV per ADC channel)
pedSigmaADC = 2
thresholdFactor = 3.0

These parameters are realistic. The HGROC ASIC can have a capacity of 16-bits; a high-energy photon shower can leave up to 800-1000 MeV in a single channel; and a zero-suppression cut of 6 ADC channels (0.2 MIPs) will allow studies of threshold cuts in the 0.2-0.5 MIP range.

The above changes have been discussed with the SiPM-on-Tile DSC lead, Miguel Arratia.

What kind of change does this PR introduce?

• Bug fix (issue #__)
• New feature (issue #__)
• Documentation update
• Other: Digitization parameters update

Please check if this PR fulfills the following:

• Tests for the changes have been added
• Documentation has been added / updated
• Changes have been communicated to collaborators Discussed with @sebouh137 and M. Arratia

Does this PR introduce breaking changes? What changes might users need to make to their code?

No.

Does this PR change default behavior?

Yes, for SiPM-on-Tile ZDC

Closes: #1541

[wdconinc]

@bschmookler Have these updated digitization parameters been conveyed to Jeff and the DAQ group for inclusion in the reference spreadsheet used for rate estimates? That has been the procedure for the other detector digitization parameters, but a lot of this was done before this ZDC was the baseline option.

[github-actions]

Capybara summary for PR 1621

• rec_dis_10x100_minQ2=0_craterlake
• rec_dis_10x100_minQ2=1000_craterlake_tracking_only
• rec_dis_18x275_minQ2=0_craterlake_18x275
• rec_dis_18x275_minQ2=1000_craterlake_18x275
• rec_dis_5x41_minQ2=0_craterlake_5x41
• rec_e_1GeV_20GeV_craterlake
• rec_pi_1GeV_20GeV_craterlake
  ^{_{Last updated 2024-09-19T16:36-04:00 9e9e433}}

[wdconinc]

Looks good in terms of diffs.

[bschmookler]

@bschmookler Have these updated digitization parameters been conveyed to Jeff and the DAQ group for inclusion in the reference spreadsheet used for rate estimates? That has been the procedure for the other detector digitization parameters, but a lot of this was done before this ZDC was the baseline option.

No, these values have not been sent to the DAQ group. I will do that.

[veprbl]

LGTM