A self seeded first level track trigger for ATLAS

Schöning, A.

doi:10.1088/1748-0221/7/10/c10010

Cited by 4 publications

(4 citation statements)

References 7 publications

(7 reference statements)

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“…Applying constraints of cluster width, directionality and timing coincidence locally will reduce the amount of data sent to the trigger processor keeping the added mass of and power of such a trigger seeding system minimal. Studies using Monte-Carlo data for the upgraded ATLAS detector using similar constraints have been presented at this workshop and indicate a relatively high purity and efficiency for triggering on high-pt muons [2]. Low momentum tracks (less than .2 Gev) will curve sharply and as a result cross more contiguous strips forming ionization clusters of 3 or more strips as shown in reference [2].…”

Section: Jinst 7 C10001mentioning

confidence: 73%

“…Studies using Monte-Carlo data for the upgraded ATLAS detector using similar constraints have been presented at this workshop and indicate a relatively high purity and efficiency for triggering on high-pt muons [2]. Low momentum tracks (less than .2 Gev) will curve sharply and as a result cross more contiguous strips forming ionization clusters of 3 or more strips as shown in reference [2]. A first level hardware pt filter is done at the front end chip by reporting "clusters" of only one or two neighbour strips over threshold as intra-layer track segment candidates.…”

Section: Jinst 7 C10001mentioning

confidence: 77%

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Prompt trigger primitives for a self-seeded track trigger

Dressanandt¹,

Halgeri²,

Kamat³

et al. 2012

J. Inst.

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A viable self-seeded track trigger for a high rate collider detector environment must have excellent angular precision, response times commensurate with beam crossing rate and low mass. We have designed a fast clustering block servicing 128 contiguous strips to be included in an LHC upgrade silicon strip front end ASIC (ABC130) with these objectives in mind. The block is based on the presence of an analog front end with binary (threshold determined) strip readout latched at each beam crossing. Combinatorial logic tests for the presence of one or two adjacent strips over threshold, a qualifying cluster, at each beam crossing and transmits up to two, eight bits clusters descriptors, specifying address and cluster width via a high speed LVDS output. It is envisioned that a correlator chip, presently in conception, receives this data and via look-up tables checks for coincident hits between silicon strip layers. Since the clustering output will report the presence of one or two hit strips, a half strip pitch (∼40 um for the ATLAS detector) resolution may be possible for each cluster. Our timing results show that the combinatorial clustering logic will settle within 6 ns. Assuming a beam crossing rate of 40 MHz, 16 bits of serialized data can be shifted out at 640MHz each crossing. This will allow a beam synchronous update rate providing data for up to two clusters for each bank of 128 strips. The data latency into the correlator chip will be only two crossings.Present power estimates suggest that the fast cluster block with LVDS driver will consume less than 12 mW.

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Section: Jinst 7 C10001mentioning

confidence: 73%

Section: Jinst 7 C10001mentioning

confidence: 77%

Prompt trigger primitives for a self-seeded track trigger

Dressanandt¹,

Halgeri²,

Kamat³

et al. 2012

J. Inst.

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show abstract

“…An alternative is to read partial information at a high rate, followed by full information at a lower rate. Proposals to implement high rate partial readout followed by low rate full readout have taken the form of a two-level trigger in regions of interest [2] or self-seeded high transverse momentum track triggers [3][4][5]. The present analysis is specific to silicon strip detectors with binary output.…”

Section: Jinst 9 P04021mentioning

confidence: 99%

Data encoding efficiency in binary strip detector readout

Garcia-Sciveres¹,

Wang²

2014

J. Inst.

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A prescription to calculate the minimum number of bits needed for binary strip detector readout is presented. This permits a systematic analysis of the readout efficiency relative to this theoretical minimum number of bits. Different level efficiencies are defined to include context information and engineering properties needed for reliable transmission, such as DC-balance. A commonly used encoding method is analyzed as an example and found to have an efficiency only of order 50%. A new encoding method called Pattern Overlay Compression is introduced to illustrate how the systematic analysis can guide the construction of more efficient readout methods. Pattern Overlay Compression significantly outperforms the above example in the occupancy range of interest.

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“…A more challenging concept relies on finding track segments that would be used as primitives for a self-seeded track trigger [63], [64], [65]. This requires specially designed and instrumented trigger layer pairs that would be used to identify high transverse momentum (high--p T ) candidate track segments with low latency to seed the first level track trigger with candidate collisions for full readout.…”

Section: Intelligent Trackersmentioning

confidence: 99%

Sensor Compendium: A Snowmass Whitepaper

Artuso

Battaglia

Bolla

et al. 2013

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Sensors play a key role in detecting both charged particles and photons for all three frontiers in Particle Physics. The signals from an individual sensor that can be used include ionization deposited, phonons created, or light emitted from excitations of the material. The individual sensors are then typically arrayed for detection of individual particles or groups of particles. Mounting of new, ever higher performance experiments, often depend on advances in sensors in a range of performance characteristics. These performance metrics can include position resolution for passing particles, time resolution on particles impacting the sensor, and overall rate capabilities. In addition the feasible detector area and cost frequently provides a limit to what can be built and therefore is often another area where improvements are important. Finally, radiation tolerance is becoming a requirement in a broad array of devices. We present a status report on a broad category of sensors, including challenges for the future and work in progress to solve those challenges.

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A self seeded first level track trigger for ATLAS

Cited by 4 publications

References 7 publications

Prompt trigger primitives for a self-seeded track trigger

Prompt trigger primitives for a self-seeded track trigger

Data encoding efficiency in binary strip detector readout

Sensor Compendium: A Snowmass Whitepaper

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