# Analysis meeting 2020-05-05

Europe/Rome

Discussion about Monte Carlo performance studies (all).

INTRODUCTION ------------ - G. Ambrosi introduced the discussion:   - new baseline design introduced in Xi'an meeting (SCD, PSD, FIT, CALO)   - common framework and tools: HerdSoftware   - personal or ad hoc tools are welcome, but the goal is to have a complete common     framework and to implement there all the tools   - mass production of MC files to be started soon for having a common data set for     performance studies      - Y. Dong said that it will be important to compare old and new baseline designs.   N. Mori answered that there is no technical problem in doing this with HerdSoftware.

- G. Ambrosi said that INFN computing resources have been requested and should be   available soon. N. Mori, A. Tykhonov, J. Casaus and M. Xu will be the reference   persons for computing resources in Italy, Switzerland, Spain and China.

- Y. Dong outlined some details about the old baseline geometry (PSD, STK, CALO).   - N. Mori added deatils about the PSD status, and said that there's no TRD     availablen for now   - G. Ambrosi added that maybe TRD is not critical for performance studies no,     so it can be placed in lower priority   CALORIMETER ----------- - G. Ambrosi asked if the CALO design is frozen or if there is still room for   optimization, and also about studies on dynamic range and saturation.   - N. Mori: dynamic range and saturation for PD readout is being studied in     Florence   - Y. Dong: spacing between crystals is acceptable so there's no will to change     it. Dynamic range and saturation for the IsCMOs readout is being studied. The     target for dynamic range is 10^6      - Y. Dong outlined that a joint IHEP-INFN working team on double readout is already   active.

- G. Marsella: at the moment it is not clear which DAQ system will be used by the   calorimeter, and which is the readyness for space   - Y. Dong: the IsCMOS readout system is almost ready, and readout speed is not an issue     while dynamic range is an issue which is currently being optimzed   FIBER TRACKER ------------- - N. Mori briefly reported about the status of the FIT in HerdSoftware: geometry and   digitization are in place,tracking is ongoing, more features will be added.

SILICON CHARGE DETECTOR ----------------------- - N. Mori briefly reported about the status of the SCD in HerdSoftware, and   added that it has to be optimized for charge measurement and geometric factor.   - A. Oliva already presented some preliminary results in Xi'an using a simplified mass   model and is willing to redo the studies with the HerdSoftware geometry.   - N. Mori added some details about the studies that should be done before freezing the     SCD geometry for mass production.

PLASTIC SCINTILLATOR DETECTOR ----------------------------- - G. Ambrosi recalled that in Xi'an was proposed to add time measurement to the PSD.   - F. Gargano replied that for studying this item it is necessary to define a geometry     (tiles or bars) and implement a meaningful digitization, so it's probably better     to put this in lower priority since there are more important things to be studied     at the moment.      - F. Gargano remembered that regular meetings are being held within European peole, and   invited Chinese colleagues to join the meetings.      TRIGGER ------- - J. Casaus said that a working group is active and working on the old baseline design,   and briefly reported about the first results obtained by the European and Chinese   subgroups. The current work is on optimization of trigger strategies. For low energies   an implementation of the surrounding materials in the simulation geometry is important.   - F. Gargano commented that a small group of people interested in this topic is starting   a discussion on the needed performance studies, especially trigger. P. Hu is already   studying the backscattering in PSD, which already showed some preliminary results in   previous meetings.   PHOTON STUDIES -------------- - F. Gargano reported that a group is being set up for starting to address the instrument   performance with photons.

MONTE CARLO ----------- - G. Ambrosi: the milestone is to have a mass production for the initial studies.   - N. Mori: preliminary work is needed before planning a mass production. Some detectors     need to be at least preliminarly optimized to avoid simulating a not-so-meaningful     design.

- N. Mazziotta: the frozen geometry configurations should be provided as files. N. Mori   added that it will be possible to use GDML for this.

- I. De Mitri: need to have a general look before starting to do anything.

- G. Marsella: need a technical document on the geometry.

- I De Mitri asked about hadronic models to be used. A. Tykhonov is going to study this   topic, but delays due to epidemic are slowing this study; help is appreciated.

OTHER STUDIES ------------- - N. Mori asked about "fine grained" studies like strip pitch, plastic scintillator size   etc.   - G. Ambrosi said that maybe its too early to speak about these issues since the     manpower is limited. Some details will be discussed within the working groups.   - I. De Mitri added that for PSD there is still to define whether to use bars or tiles,     it will be required to perform various iterations of the study by freezing the     geometries.   - N. Mazziotta suggested to use dummy volumes in the simulation and then reconstruct the     energy deposits in each sensitive elements during offline processing.     - F. Gargano added that for PSD it is already being done, but it works only for very       simple geometry, i.e. without gaps between the elements     - V. Formato added that also for FIT and STK a similar approach is already in place.

     CLOSING REMARKS --------------- - G. Ambrosi proposed that the various topics should be discussed within the restricted   working groups, and that reports should be given during the bi-weekly general analysis   meetings.

- People in charge of coordinating the working groups:   - SCD: A. Oliva   - PSD: F. Gargano, Chinese colleague (TBD)   - CALO: IHEP person (TBD)   - Photons: F. Gargano   - Hadronic engine: A. Tykhonov, I. De Mitri   - Trigger: M. Xu, J. Casaus   - N. Mori invited everybody to subscribe to the analysis mailing list to be updated about   the next meetings, by sending a request to mori@fi.infn.it

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