LMB stands for Laser Monitoring Board. It is foreseen to drive and monitor the lasers at HL-LHC.
It will receive the 160 MHz clock and triggers info from lpGBT located on an embedded FE board (connected to a dedicated back end board).
- There will be a 1280 MHz clock generator which will drive a fast 14 bits ADC to digitize a signal from a PIN diode to make an image of each laser pulse.
The data of this ADC is splitted to 8 streams at 160 MHz using the compressed data format used for the barrel electronics.
- There will be 7 LiTE-DTU to monitor the signals coming form the Spy-Box (11 PIN diodes (for 11 fibers) in parallel connected to a CATIA chip on each SpyBox submodule).
Each Lite-DTU is streamed using the compressed data format used for the BArrel electronics.
- All the streams are connected to the FE board to be sent to the Back-End electronics and thus be packed with the remaining part of the ECAL events.
- The board generates triggers for lasers, DSO and others according to data received by the FE board. Each trigger can be tuned in delay.
- There is also a connection by IPbus with a Gigabit ethernet port. For fast data monitoring and device programming
- The board format is not yet fixed.