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arXiv 0808.4102hep-ex
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ATLAS触发菜单用于早期数据采集

The ATLAS trigger menu for early data-taking

T. Kono

摘要:

ATLAS触发系统基于三个级别的事件选择,从40 MHz的初始聚束交叉率中选择感兴趣的物理。在LHC以10^34 cm^-2 s^-1的光度运行期间,必须每25 ns做出一次决定,每个束团交叉包含大约23个相互作用。三个触发电平中的选择必须提供足够的抑制,以将速率降低到200 Hz,与离线计算能力和存储容量兼容。LHC预计将于2008年夏季开始运行,峰值亮度为10^31 cm^-2 s^-1,束团数量远少于标称运行,但很快就会上升到更高的亮度。因此,我们需要部署触发器选择,可以适应不断变化的光束条件,保持有趣的物理和探测器的要求,可能会随这些条件而变化。我们目前的状态,准备的触发菜单的早期数据,显示我们计划如何部署触发系统从第一次碰撞的标称光度。我们还展示了从模拟数据中获得的预期速率和物理性能。

英文摘要:

The ATLAS trigger system is based on three levels of event selection that select the physics of interest from an initial bunch-crossing rate of 40 MHz. During nominal LHC operations at a luminosity of 10^34 cm^-2 s^-1, decisions must be taken every 25 ns with each bunch crossing containing about 23 interactions. The selections in the three trigger levels must provide sufficient rejection to reduce the rate down to 200 Hz, compatible with the offline computing power and storage capacity. The LHC is expected to begin operations in summer 2008 with a peak luminosity of 10^31 cm^-2 s^-1 with far fewer bunches than nominal running, but quickly ramp up to higher luminosities. Hence, we need to deploy trigger selections that can adapt to the changing beam conditions preserving the interesting physics and detector requirements that may vary with these conditions. We present the status of the preparation of the trigger menu for the early data-taking showing how we plan to deploy the trigger system from the first collision to the nominal luminosity. We also show expected rates and physics performance obtained from simulated data.

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