Carrier evaluation procedure

Once you have the carrier hooked up, and the detector assembled, connected to the cooling system, power and fiber optics, you can power up the detector. For carrier evaluation, you do not need to connect timing fiber optics.

Once powered up, you will see the current consumption go to 1.7Amps, then go down to ~945mAmps when the FPGA is configured. Once the ASICs are configured, the current consumption will go up to 3.2Amps if all ASICs are available (24V, 3.5A on channel #1).

Get the latest release software on rdsrv321 (Clean room server) as follows (or IC lab/ rdsrv314)

ssh -Y rdsrv321 
# or ssh -Y rdsrv314

git clone --recursive git@github.com:slaclab/epix-hr-m-320k.git -b v1.1.9
cd software/
source setup_env.sh
#open the software
cd scripts
#if running rdsrv314 (IC lab):
python devGui.py --dev /dev/datadev_1
#if running rdsrv321 (clean room TID):
python devGui.py
  

Remember to document your work for each of the carriers here. Make sure you specify the digital board used as well. The carrier identified is printed on the strong back while the digital board identifier is printed on the PCB.

Important note : Before you start with the tests, remember to cover the sensors with some thick metal (aluminum of the case of the carrier) to get consistent results.

This test is composed of 4 steps:

1. Generate eye diagram (error scan) for each lane
2. Check charge injection
3. Check laser
4. Check BIAS as low as -50V

For laser, you would need to use the cross laser or any other. set the voltage to 5V and the max current to 20mA. Then you would need to collect dark (after removing the aluminum cover!), then enable it, and simply point the laser to the ASIC and run a software trigger, and finally see the image.

For BIAS, you would need to connect the Keithley rear port to the HV_BIAS and HV_GND of the detector power BNC cables (labelled HV_bias and HV_GND). Set the max compl current to 105mA, and gradually reduce the bias starting at -1V to -50V following the table below. 

BIAS measurement table template