A COMET Experiment Phase-I is designed to search for a muon to an electron conversion with a 100 times better sensitivity than the current upper limit on its branching ratio in order to investigate the new physics beyond the standard model. To achieve such an unprecedented sensitivity, a high intensity muon beam is mandatory. In consequence, an extremely high hit rate is predicted and it can cause a high trigger rate more than tens of kHz dominated by the background events. Then the high trigger rate would lead to the severe dead-time in the data acquisition. Therefore it is essential for a success of the experiment to reduce the trigger rate down to a few kHz within a processing time shorter than 5 μs while maintaining the signal efficiency high enough. We are developing an event classification algorithm utilising a CDC hit information and a dedicated fast online trigger system to accomplish this aim. The event classification based on a boosted decision tree shows 3.8 kHz of trigger rate, which almost satisfies the rate requirement, with a good compatibility to the trigger electronics. The total processing time to generate the trigger decision is estimated to be ~3 μs which also fulfils the timing requirement.
|Title of host publication||2018 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2018 - Proceedings|
|Subtitle of host publication||2018 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2018; Sydney; Australia; 10 November 2018 through 17 November 2018|
|Place of Publication||Piscataway NJ USA|
|Publisher||IEEE, Institute of Electrical and Electronics Engineers|
|Number of pages||4|
|Publication status||Published - 5 Sep 2019|
|Event||IEEE Nuclear Science Symposium and Medical Imaging Conference, 2018 - International Convention Centre, Sydney, Australia|
Duration: 10 Nov 2018 → 17 Nov 2018
|Name||2018 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2018 - Proceedings|
|Conference||IEEE Nuclear Science Symposium and Medical Imaging Conference, 2018|
|Abbreviated title||NSS/MIC 2018|
|Period||10/11/18 → 17/11/18|
|Other||The 2018 Nuclear Science Symposium will offer an outstanding opportunity for scientists and engineersworking in the field of radiation instrumentation to meet together, present new results and discuss the latestdevelopments in their field, not only with their own colleagues, but also with colleagues from related fields suchas medical imaging and room temperature semiconductors. The NSS is held contemporarily with the 2018Medical Imaging Conference and the 25th International Symposium on Room Temperature X Ray and GammaRay detectors, which brings together one of the largest collection of detector scientists and experts in the world. This very international venue, which is being held for the first time in Sydney, Australia, promises to be one of best programs in the long history of this conference.|
The NSS program emphasizes the latest developments in detector technology, radiation detection, detector materials, new instrumentation techniques, and their implementation in high energy and nuclear physics,astrophysics, accelerators, national nuclear security, and many other applications in various types of radiation environments. Joint sessions will be held with the MIC and RTSD, along with a number of special topic workshops covering areas of specific interest. Short Courses on a variety of topics of interest to the NSS community are also being offered.
- Trigger System