Analysis meeting 2020-05-05


Discussion about Monte Carlo performance studies (all).

- 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
- 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
  - 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

- 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
- 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.

- 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.

- 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.
- 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.
- F. Gargano reported that a group is being set up for starting to address the instrument
  performance with photons.

- 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

- 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.


- N. Mori asked about "fine grained" studies like strip pitch, plastic scintillator size
  - 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
  - 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.

- 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

- 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


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    • 10:00 12:00
      Discussion about detector studies 2h