Commissioning Experience and Upgrade Plans of the Pixel Luminosity Telescope for Luminosity Measurement at CMS

Conference abstract submitted for poster presentation at TWEPP 2017 (Topical Workshop on Electronics for Particle Physics 2017):

The Pixel Luminosity Telescope (PLT) is a dedicated system for luminosity measurement at the CMS experiment using silicon pixel sensors arranged into "telescopes", each consisting of three planes. It was installed during LS1 at the beginning of 2015 and has been providing online and offline luminosity measurements throughout Run 2. The online bunch-by-bunch luminosity measurement employs the "fast-or" capability of the pixel readout chip (PSI46) to identify events where a hit is registered in all three sensors in a telescope corresponding primarily to tracks originating from the interaction point. In addition, the full pixel information is read out at a lower rate, allowing for the calculation of corrections to the online luminosity from effects such as the miscounting of tracks not originating from the interaction point and detector efficiency. In this talk, we will present details of the commissioning and operational history of the currently installed hardware and experience with offline analysis, in addition to upgrade plans for LS2.

Plots to be approved

Figure Caption
Error: (1) can't find 2017PLTsigmavis.png at /Main.MedipixPlotsApproval Measured uncorrected visible cross-section (SigmaVis) per LHC fill for the Pixel Luminosity Telescope during 2017. The values depicted represent the mean of the SigmaVis calculated for each colliding bunch-crossing (BX) during LHC emittance scans at the beginning of each fill. The error bars are calculated from the standard deviation of the SigmaVis values for each colliding BX. The horizontal red line corresponds to the mean SigmaVis and the dashed red lines correspond to one standard deviation from this mean. The downward trend highlighted in red coincides with a drop in efficiency which was mitigated by an increase of the operational high-voltage.

-- SrinidhiBheesette - 2019-01-18

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