DAQ coordinator: David Emschermann d.emschermann(at)gsi.de

The CBM data challenge

• fixed target setup to investigate the QGP phase diagram in region of high baryon-densities
• very high interaction rate environment: 10⁵ - 10⁷/s (A+A), up to 10⁹/s (p+A)
• fast and radiation hard detectors with free-streaming readout electronics
• high-speed Data AQuisition (DAQ) system
• FPGA based readout chains complemented by  state of the art computing infrastructure allowing for online event reconstruction
• more than 5.000 GBT links operating at 4.8 Gbps as data source
• about 2 TB/s bandwidth to the Green Cube

CBM readout in a nutshell

• Collect raw data from subsystems
• Pre-process data in FPGAs
• Send micro-slices to Green Cube
• Pack data into time-slices
• Deliver time-slices to online analysis
• Digest a total bandwidth of 2 TByte/s

CBM readout topology with CRI

HTG-Z920 - Common Readout Interface (CRI) prototype country of origin: California

• Xilinx ZYNQ UltraScale+ FPGA - next generation board
• will be operated in the FLES input node
• to cover the functionality of both the AFCK and FLIB in a single FPGA board

ASUS ESC8000 G3 Server (FLES Input Node) country of origin: Taiwan 

• FLES input node
• can take up to 8x FLIB or 4x CRI
• used to receive data in micro-slices 
• forwards data to the FLES compute nodes

Mellanox SB7800 – EDR 100 Gb/s InfiniBand Smart Switch country of origin: Israel

• interface between FLES input and FLES compute stage
• will allow to transfer up to 1.2 Tb/s over 96 optical fibers

mCBM preparation

Optical fiber connection between the mCBM cave, DAQ container and  the Green IT Cube

mCBM readout scheme for 2019

Key Project Institutes:

• GSI, Darmstadt, Germany
• CQU, Chongqing, China
• FIAS, Frankfurt, Germany
• IRI, Frankfurt, Germany
• KIT, Karlsruhe, Germany
• USTC, Hefei, China
• VECC, Kolkatta, India
• WUT, Warsaw, Poland