Abstract
After the first three years of the LHC running, the ATLAS experiment extracted its pixel detector system to refurbish and re-position the optical readout drivers and install a new barrel layer of pixels. The experiment has also taken advantage of this access to install a set of beam monitoring telescopes with pixel sensors, four each in the forward and backward regions. These telescopes are based on chemical vapor deposited (CVD) diamond sensors to survive in this high radiation environment without needing extensive cooling. This paper describes the lessons learned in construction and commissioning of the ATLAS Diamond Beam Monitor (DBM). We show results from the construction quality assurance tests and commissioning performance, including results from cosmic ray running in early 2015.
Highlights
The Diamond Beam Monitor (DBM) [1] collects data from the Large Hadron Collider (LHC) collisions inside ATLAS [2]
The DBM FE-I4 data is readout as the 15th-stave of the Insertable b-Layer (IBL) [3], and a data stream using the hitbus data is used for luminosity estimates
The chip/sensor assemblies are glued to a flexible PCB, and the readout chip is wire bonded to the pads on the PCB
Summary
The Diamond Beam Monitor (DBM) [1] collects data from the LHC collisions inside ATLAS [2]. Each telescope consists of 3 layers of diamond/silicon sensors with FE-I4 readout chips. Each pair of telescopes is connected through a hitbus chip to allow specialized triggering and readout. The DBM FE-I4 data is readout as the 15th-stave of the Insertable b-Layer (IBL) [3], and a data stream using the hitbus data is used for luminosity estimates
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