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Chiba was responsible for the PMT and EHE simulation programs and many of our service tasks are related to these business. The detector simulation project, Romeo, which is also responsible for the DOM’s acceptance calculation to be implemented in the Photonics and CLsim, is maintained by our group ( S. Yoshida, K. Mase ) who includes one of the original authors of Romeo ( S. Yoshida ).

The detector calibration using the standard candle has also been on our priority to provide the collaboration with some key knowledge of our detector response. K.Mase , S.Yoshida , Lu Lu maintain this activity to have better understanding of the DOM response and the ice propaties.. A.Ishihara maintains responsible for the SC data filtering to remove chance-coincident muon events for calibration analyses use.

Our other service activities include co-chair of calibration WG ( K.Mase ), charge timing extractor module, Portia, ( A. Ishihara ), which is alternative to WaveReform for processing large pulses in DOM. This module has been frequently used in EHE and monopole analysis that must handle extremely luminous events. The EHE simulation framework/meta-project is maintained by K. Mase and S. Yoshida .

Chiba also works on EHE filters that contain most energetic population of IceCube events. The filtered data are compared with simulation ( A. Ishihara/S,Yoshida ) for confirming our detector response and its stability to high energy data.

Because the present EHE signal search procedures are not CPU-intensive, S.Yoshida is serving as a contact person and maintainer on the online signal selection pipeline for sending alerts to other astronomical instruments. The online search for extremely-high energy neutrinos allows IceCube to trigger follow-up observation by optical/gamma-ray telescopes. He also serves as a member of Realtime Oversight Group to ensure functions of the online processing for sending alerts.   A,Ishihara provided the initial baseline algorithm for this program.

T. Kuwabara participates the effort to measure atmospheric neutrino fluxes. He also provides an interface to the SuperK collaboraion for unified analyses with their data.

Our analysis efforts are mainly focused in search for extremely-high energy neutrinos. K.Mase and the graduate students (H.Ijiri, S.Ueyama) are working on modeling the non-linear behavior of PMT responses with the new in-lab measurements. The updated model is ready to be implemented in the new release of simulations for the collaboration use.

Chiba’s capability for MC data production has been improved. We work on ultra-high energy Corsika simulation and Juliet signal simulation. As network bandwidth from Japan to US is limited, we transfer data to Madison by shipping USB disks. K. Mase maintains this service activity.

Faculty:

 Shigeru Yoshida – maintain Romeo and EHE simulations, detector calibration

  Keiichi Mase – Calibration WG co-chair, maintain Romeo and EHE simulation, MC/Data comparison for high- energy events, flasher/Standard candle analysis for detector calibration 

                                          Aya Ishihara –maintain EHE simulation. MC/Data comparison for EHE-filtered events, maintain the reconstruction projects (Portia), and develop the suitable algorism for the online search of EHE neutrino signals.

 

                                             Scientists and Post Docs:

                                            Achim Stossel – ice/DOM calibrations with the standard candle and flasher data. Simulation production manager to install the IceCube glide-ins computing system to the Chiba local CPU clusters.

                                            Analysis topics: IC86 –Not assigned at the moment

                                           Takao Kuwabara – Atomospheric  flux analysis

                                            Analysis topics: Atmospheric  analysis  

Lu Lu – detector development and simulation study for IceCube gen2

                                            Analysis topics: Multi-flavor PeV spectrum analysis.

                         Ph.D. Students:

 Hiroto Ijiri – Detector calibration, testing for IceCube Gen2

    Thesis/Analysis topics: Not at the moment

Computing Resources
Chiba has 16 computational nodes and 196 cores in total. They are all intel Xenon machines and the latest one’s specification is Xeon E5-2667 v2 with the frequency of 3.3 GHz.
 
There are also two GPU nodes and one has two nvidia Tesla K40 and another has two Tesla K80, so 6 cores in total.

 

 

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Chiba_MoU_SOW_2016.0923.docx