Corryvreckan: a modular 4D track reconstruction and analysis software for test beam data

Abstract

Corryvreckan is a versatile, highly configurable software with a modular structure designed to reconstruct and analyse test beam and laboratory data. It caters to the needs of the test beam community by providing a flexible offline event building facility to combine detectors with different readout schemes, with or without trigger information, and includes the possibility to correlate data from multiple devices based on timestamps. Hit timing information, available with high precision from an increasing number of detectors, can be used in clustering and tracking to reduce combinatorics. Several algorithms, including an implementation of Millepede-II, are provided for offline alignment. A graphical user interface enables direct monitoring of the reconstruction progress and can be employed for quasi-online monitoring during data taking. This work introduces the Corryvreckan framework architecture and user interface, and provides a detailed overview of the event building algorithm. The reconstruction and analysis capabilities are demonstrated with data recorded at the DESY II Test Beam Facility using the EUDAQ2 data acquisition framework with an EUDET-type beam telescope, a Timepix3 timing reference, a fine-pitch planar silicon sensor with CLICpix2 readout and the AIDA Trigger Logic Unit. The individual steps of the reconstruction chain are presented in detail.

First demonstration of in-beam performance of bent Monolithic Active Pixel Sensors

“…Data were processed in the Corryvreckan test beam reconstruction software framework [10] by fitting straight lines to clusters found in the six reference planes and interpolating the tracks to the DUT. Event and track quality selection criteria were applied to ensure a clean data sample: precisely one track per event, good straightness (𝜒 2 ∕NDF < 3) of the track, and track points on each reference plane.…”

Comparison of different sensor thicknesses and substrate materials for the monolithic small collection-electrode technology demonstrator CLICTD

“…The software framework Corryvreckan [17,18] is used to perform offline reconstruction and analysis of the testbeam data. Individual events are defined by CLICTD readout frames.…”

Upgrading the beam telescopes at the DESY II Test Beam Facility

“…Automated data taking is realized via a full integration into EUDAQ2 [10]. The recorded data is analyzed with Corryvreckan [11]: Around each TLU trigger, a time window with ±10 µs is created and all TelePix hits with matching timestamps are added to the frame. Subsequently, clustering in space (and time for the TelePix) is performed.…”