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04/19/2023 1
T992 SLHC Rad-Hard Sensor Tests at FTBF
Lorenzo UpleggerFermilab
All-Experimenters’ MeetingApril 25, 2011
04/19/2023 2
Particle fluence at SLHC
At R=5cm the radiation fluence will be around 1016 n-eq/cm2!!
L = 2500 fb-1
PIXELS STRIPS
04/19/2023 4
T992 Goals
• Our goal is to test the candidates for the SLHC upgrade before and after irradiation to compare the performances and understand if we have a technology capable of withstanding the enormous fluences. We are mainly focusing our efforts on three different sensor types:
Diamond sensors 3D sensors MCZ Planar silicon sensors
• Big global effort on Sensor R&D for the SLHC RD42 (diamond) 3D consortium (3D sensors) ATLAS, CMS and LHCb
• We are testing all the different sensors using the same Read Out Chip (ROC) in order to have a fair comparison between all candidates
• T992 is open to all, independent of their experimental affiliation or interest in any particular technology
04/19/2023 5
3D Sensors
First proposed by Sherwood Parker in the mid-90s:• “3D” electrodes -> narrow columns along the detector thickness
diameter: 10 μm, distance: 50-100 μm
• Lateral depletion: great for rad-hard Lower depletion voltage Fast signal
• 3D detectors also allow the implementation of the “Active Edge” concept• Interest in the Forward physics community• Active Edge concept can lead to improved layout geometries
04/19/2023 6
CMS 3D Sensors
• CMS pixel size is 100 μm x 150 μm
• Different designs: 1 column pixel 2 columns pixel 4 columns pixel
3D sensor produced at SINTEF
8
Many different institutions and collaborators for the CMS pixel upgrade• Fermilab
S. Kwan, A. Prosser, L. Uplegger, R. Rivera, J. Andresen, J. Chramowicz, P. Tan, C. Lei• Purdue
E. Alagoz, O. Koybasi, G. Bolla, D. Bortoletto• Colorado
M. Dinardo, S. Wagner, J. Cumalat• Texas A&M
I. Osipenkov• Milano
L. Moroni, D. Menasce, S. Terzo• Torino
M. Obertino, A. Solano• Tata Institute
S. Bose• Buffalo
A. Kumar, R. Brosius• IHPC Strasbourg
J. M. Brom
Non-CMS T992 participants: • Syracuse
J. Wang, M. Artuso
Collaboration
04/19/2023 9
Setup
CAPTAN STACK POWER SUPPLY DUT SENSOR BIASTELESCOPE BOX
ROUTERSCINTILATOR
• The setup is the CAPTAN based pixel DAQ which is part of the MTEST facility.
• We have an entire pixel telescope with 8 silicon planes, 4 upstream and 4 downstream, and we place the Detectors Under Test (DUTs) in the middle.
04/19/2023 10
Runs
• We already took data in two previous test-beam campaigns (September and November 2010)with some 3D and diamond detectors.
• This time the goal was to test new 3D and diamonds and also study some of the detectorsthat were already tested in November and then irradiated.
unfortunately we were not able to make any of the 3D irradiated sensor work and we are still trying to understand what happened.
• We then proceeded to test 9 new 3D sensors and only 1 diamond detector.
• Again for all detectors we did: Angle scans Bias scans Threshold scans
With so many detectors and so many scans we had to do we took advantage of the double spill structure that the Accelerator Division provided us.We really thank the management which made this possible in such a short time!
04/19/2023 11
Online quick check
Our software allows us to verify online that we don’t have particular problems…
12
Prob(2, ndof)
prob(c2,ndof) > 0.01 (exclude DUT)
Xtrk – Xhit (mm) Ytrk – Yhit (mm)
s~ 33 mm
~ 4.6% nrow 2
Preliminary results
• The analysis is ongoing and we only have few results.• We have regular biweekly meetings where we are discussing issues and possibleimprovements in the offline software which is still under construction.
Diamond detector residuals
the residuals are well in agreement with the single hit resolution expected when the DUT is facing the beam and most of the hits fire just one pixel
04/19/2023 13
Conclusions and plans
• As mentioned earlier the main goal of testing irradiated devices was not achieved sincewe were not able to make them work. We are still investigating what happened.
• We had anyway many other 3D and diamond sensors to test and we were able to complete our program easily on time thanks to the double spill structure at MTEST (Thanks!)
• We will irradiate the detectors that we just tested at LANL at the end of June with a 800 MeVproton beam but this time we will proceed one small step at a time.
• In October we’ll be back at the MTEST to test these irradiated devices and to characterizenew prototypes
• Finally, after we finalize our offline analysis programs, we’ll be able to characterize in detailthe detectors before and after irradiation!
A special thank to Aria and all the Fermilab divisions involved in this effort!