Transcript ABC130 Chip Irradiation Testing

ABC130 Chip Irradiation Testing
LAUREN RIDDIFORD
NICOLA VENTURI, KYLE CORMIER
SUPERVISOR: RICHARD TEUSCHER
Project recap
Working on the inner tracker (ITk) for the high luminosity LHC (HL-LHC) which should be ready
by ~2025
Specifically, the SCT (semiconductor tracker) will have a front end chip which reads out data
called the ABC130
The chip is going to change as it is exposed to the radiation from particle collisions in terms of
the current draw, voltage, and noise
Need to map these effects to know how much power will be needed over the lifetime, what
cables are needed, etc.
Previous tests have been high dose, now running tests at 2.3 kRad/hr and -25 C, close to
projected conditions of the detector
Temperature Tests
Goal: chip at -25 C
Tests:
Peltier module at different
voltages
Chiller at different temperatures
NTC beneath chip vs. placed
elsewhere on PCB
Cooling air which flows into box
Setting up at Prevessin
All the cables had to be wired from a buffer
room 10m away into the room with the
radiation
Issues: chiller tube not stable, PCB had holes
for mounting too small for box, some cables
not quite long enough, one box screw broke
More test pictures
Current status
Tests began on Feb. 25 in the evening, have been running smoothly for a week and a half at this
point
Humidity/temperature sensor inside the box stopped working after about 100 krad of radiation
So far, have observed significant current increase (32 mA  75 mA)
Concerns: radiation damage to the driver board, chiller tubes at the insertion point into the box,
leaking chiller/ice on the chip causes it to short
Will hopefully have interesting results in a couple weeks (just in time for final presentations)
Preliminary Results
Preliminary Results
Software side
Experienced some crashes as we were testing
Communication between the chip and the computer is very touchy: cables that didn’t work,
either electrical noise or power draw from the chiller caused data errors
At this point, most major development is done – automated data analysis, vastly improved
irradiation logging
Now trying to clean up/make code safer – find and remove memory leaks, allow the code to
work when the chip isn’t connected, flexibility in size of arrays, etc.
Potentially automating restarting ROOT automatically based on triggers within the system
(nonsense readings of voltage or temperature which is usually fixed with a reset)
Travels