Abstract
The CMS hadronic calorimeter employs plastic scintillator active material in the barrel and endcap (HBHE). In Run 2, the LHC operates at 13 TeV center-of-mass energy with up to 50 simultaneous collisions per bunch crossing (pileup) and a 25 ns bunch spacing. The HBHE scintillator light pulse is only 60% contained in a 25 ns window, resulting in significant pulse overlap for consecutive events (out-of-time pileup). This talk presents a novel algorithm that will be used in 2018 for subtracting out-of-time pileup in HBHE both online in the software trigger and offline. The algorithm includes methods for both the barrel with hybrid photodiode photosensors and QIE8 digitizers, and the endcap with silicon photomultipliers and QIE11 digitizers, including the challenging charge-dependent pulse shaping effects of the QIEs. The on-detector pulse shape measurement method and results are also shown. The new algorithm is five-to-ten times faster than the previous one, and for the first time CMS will use the offline method at the trigger level.
Highlights
The HBHE scintillator light pulse is only 60% contained in a 25 ns window, resulting in significant pulse overlap for consecutive events
The CMS hadron calorimeter (HCAL) system is composed of a brass and scintillator calorimeter with a central barrel (|η| ≤ 1.6), and two endcaps (1.6 ≤ |η| ≤ 3.0), steel and quartz fiber forward calorimeters (3.0 ≤ |η| ≤ 5.2), and an additional outer calorimeter in the the barrel region
Pulse shape measurement The time profile of the HBHE signal response, or pulse shape, for a single channel is determined by the hadronic shower, the scintillation process in the tiles, the optical transmission and wavelength-shifting, the photosensors, and the QIE chips
Summary
The CMS hadron calorimeter (HCAL) system is composed of a brass and scintillator calorimeter with a central barrel (|η| ≤ 1.6), and two endcaps (1.6 ≤ |η| ≤ 3.0), steel and quartz fiber forward calorimeters (3.0 ≤ |η| ≤ 5.2), and an additional outer calorimeter in the the barrel region. 2. Pulse shape measurement The time profile of the HBHE signal response, or pulse shape, for a single channel is determined by the hadronic shower, the scintillation process in the tiles, the optical transmission and wavelength-shifting, the photosensors, and the QIE chips. In order to measure a pulse shape in bins finer than 25 ns, data at different arrival times is needed.
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