| CMS Note | |
| Report number | CMS-CR-2018-140 |
| Title | New method of out-of-time energy subtraction for the CMS hadronic calorimeter |
| Author(s) | Lawhorn, Jay Mathew (Caltech) |
| Collaboration | CMS Collaboration |
| Publication | 2019 |
| Imprint | 23 Jul 2018 |
| Number of pages | 7 |
| In: | J. Phys.: Conf. Ser. 1162 (2019) 012036 |
| In: | 18th International Conference on Calorimetry in Particle Physics, Eugene, Usa, 21 - 25 May 2018, pp.012036 |
| DOI | 10.1088/1742-6596/1162/1/012036 |
| Subject category | Detectors and Experimental Techniques |
| Accelerator/Facility, Experiment | CERN LHC ; CMS |
| 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 5-10 times faster than the previous one, and for the first time CMS will use the offline method at the trigger level. |
| Copyright/License | Publication: (License: CC-BY-3.0) |
Corresponding record in: Inspire
Record created 2018-07-31, last modified 2022-01-14
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