CDF Run II silicon vertex detector annealing study

Journal Article · Sat Jan 18 00:00:00 EST 2014 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2014.01.017· OSTI ID:1854762

Stancari, M. ^[1]; Knoepfel, K. ^[1]; Behari, S. ^[1]; Christian, D. ^[1]; Di Ruzza, B. ^[2]; Jindariani, S. ^[1]; Junk, T. R. ^[1]; Mattson, M. ^[3]; Mitra, A. ^[4]; Mondragon, M. N. ^[1]; Sukhanov, A. ^[1]

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1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
3. Wayne State Univ., Detroit, MI (United States)
4. Academia Sinica, Taipei (Taiwan)

Between Run II commissioning in early 2001 and the end of operations in September 2011, the Tevatron collider delivered 12~fb$$^{-1}$$ of $$p\bar{p}$$ collisions at $$\sqrt{s}=1.96$$ TeV to the Collider Detector at Fermilab (CDF). During that time, the CDF silicon vertex detector was subject to radiation doses of up to 12 Mrad. After the end of operations, the silicon detector was annealed for 24 days at $$18^{\circ}$$C. In this paper, we present a measurement of the change in the bias currents for a subset of sensors during the annealing period. We also introduce a novel method for monitoring the depletion voltage throughout the annealing period. The observed bias current evolution can be characterized by a falling exponential term with time constant $$\tau_I=17.88\pm0.36$$(stat.)$$\pm0.25$$(syst.) days. We observe an average decrease of $$(27\pm3)\%$$ in the depletion voltage, whose evolution can similarly be described by an exponential time constant of $$\tau_V=6.21\pm0.21$$ days. These results are consistent with the Hamburg model within the measurement uncertainties.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: AC02-07CH11359
• OSTI ID: 1854762
• Report Number(s): FERMILAB-PUB-13-576-E-PPD; arXiv:1312.6021; oai:inspirehep.net:1273489; TRN: US2304957
• Journal Information: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 743; ISSN 0168-9002
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
annealing
silicon
vertex detector
CDF detector operations