Oct 10 – 14, 2016
San Francisco Marriott Marquis
America/Los_Angeles timezone

Readout and trigger for AFP detector at ATLAS experiment

Oct 13, 2016, 3:30 PM
1h 15m
San Francisco Marriott Marquis

San Francisco Marriott Marquis

Poster Track 1: Online Computing Posters B / Break


Krzysztof Marian Korcyl (Polish Academy of Sciences (PL))


AFP, the ATLAS Forward Proton detector upgrade project consists of two
forward detectors at 205 m and 217 m on each side of the ATLAS
experiment at the LHC. The new detectors aim to measure momenta and
angles of diffractively scattered protons. In 2016 two detector stations
on one side of the ATLAS interaction point have been installed and are
being commissioned.
The front-end electronics consists currently of eight tracking modules
based on the ATLAS 3D pixel sensors with the FEI4 readout chip. The
chips are read via serial lines at 160 Mbps. The transmission line
consists of 8 m of electrical twisted pair cable to an optical converter
and 200 m of optical fiber. The DAQ system uses a FPGA board based on a
Xilinx Artix chip, HSIO-2, and a mezzanine card that plugs into this
board. The mezzanine card contains a RCE data processing module based on
a Xilinx Zynq chip.
The software for calibration and monitoring of the AFP detectors runs on
the ARM processor of the Zynq under Linux. The RCE communicates with the
ATLAS Run Control software via the standard ATLAS TDAQ software. The AFP
trigger signal is generated from the OR of all pixels of each frontend
chip where the signals from individual planes can be logically combined.
The resulting trigger signal in the form a NIM pulse is transmitted over
a 260 m long air core coaxial cable where it is fed into the ATLAS LVL1
trigger system.
In this contribution we give an technical overview of the AFP detector
together and the commissioning steps that have been taken. Furthermore
first performance results are presented.

Primary Keyword (Mandatory) DAQ
Secondary Keyword (Optional) Trigger

Primary author

Catrin Bernius (New York University (US))


Krzysztof Marian Korcyl (Polish Academy of Sciences (PL))

Presentation materials