2 The CDF Experiment at Fermilab Contents - Harvard University ...

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20 Section 2: CDF Hardware 2.2.2 Data Acquisition for the Silicon Vertex Detector (SVX) (Prof. Huth, Dr. Maksimovic, Mr. Bailey & Ms. Spiropulu) The Harvard group has made a long standing eort in SVX data acquisition, concentrated on the Silicon Readout Controller (SRC). The most recent accomplishments of Huth, Maksimovic, and Bailey, working closely with engineer Nathan Felt, are described below. Preceding this was the ground-breaking work on the widely used Silicon Test Acquisition and Readout (STAR) system and SVXIII chip by Spiropulu, Colin Gay (now at Yale), Raimund Strohmer (now at MPI), and engineer John Oliver, which is described next. Overview: Developments from 1993 through 1996 In 1992, a silicon vertex detector was added to CDF. It was used to detect secondary vertices from heavy avor weak decays - an excellent tool for b-tags in top physics and for B-physics. Due to radiation damage in 1993, CDF replaced this detector with SVX 0 which uses AC-coupled detectors and a radiation-hard readout chip. Already in 1993 CDF started working on the design of the silicon detector for Run II: the SVXII project. The challenge of this project is the \dual ported" pipeline that stores the data during the formation of the Level 1 trigger. The SVXII project uses the SVXIII chip which supports simultaneous digitization and readout of data while additional analog data is entering the pipeline. The SVXIII chip was jointly designed by Fermilab and LBL. The Harvard group took responsibility for the design, prototyping, construction, and support of one of the major components of the Data Acquisition stream, namely, the Silicon Readout Controller (SRC). A schematic of the SVXII DAQ functionality isshown in Fig 12. Long before the nal DAQ system was ready, the SVXII group needed to be able to read out detectors with a chip as close as possible to the nal version (SVXII, SVXIIb). Studies of signal-to-noise ratio before and after the silicon suered radiation damage were required, as well as benchmark measurements of resolution, etc. The initial team consisted of Huth (PI) John Oliver (engineer), Gay, Spiropulu and Harlan Robins (undergraduate student). The prototype card that we designed and built was called the Silicon Test Acquisition and Readout module (STAR). By the summer of 1996 the Harvard group provided seven prototype STAR modules that armed later test stand facilities all over the world (Lab D at Fermilab, Pisa, New Mexico, Pittsburgh, KEK, to mention a few; they are still being used with great success. As the
Section 2: DAQ for the Silicon Vertex Detector 21 The SVXII DAQ To Level 3 Trigger CDF Clock VME Readout Buffers CMD STAT Silicon Readout Controller CMD STAT Trigger Supervisor To Level 2 Trigger DATA 4 Lines @ 132.5 MB/sec each CMD Fiber Interface Boards STAT CMD DATA 10 Lines @ 53 MB/sec each SVXII Detector Figure 12: Schematics of the SVX II data acquisition system.
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Page 36 and 37: 36 Section 2: CDF 2.3 Run I Physics
Page 38 and 39: 38 Section 2: CDF Physics Analysis
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70 Section 2: CDF Physics Analysis
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Section 2: CDF 97 multijet trigger
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Section 2: CDF 99 The Jet Pseudora
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Section 2: CDF 101 while the proble
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Section 2: CDF 103 Talks at Confere
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Section 2: CDF 105 References [1] T
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