SUMMARY OF THE TECHNICAL CONVENERS MEETING OF 12 January 2017
                         
Present: Karsten, Toshiaki, Taikan, Matthew, Auguste, Marcel, 
Ivan, Paul, Wataru, Felix, Yan, Imad, Akimasa, Claude.

INTERFACE DOCUMENTS:
- An updated document template has been distributed by Roman, 
  for which comments are welcome until mid-February.
- For subdetectors with several technology options, it is agreed 
  that the subdetector co-conveners will define together which 
  information is technology independent, and fill the document
  once for this. Sections which are technology dependent will 
  be duplicated.
- There is also consensus that the general ILD reference document
  on conventions, etc... should now be started by the CDI conveners.
- The PDAP report questionned the timeliness of studying now the 
  integration of subdetectors, but it is generally felt that this 
  is already useful to anticipate the implications of each technology 
  and check the correctness of its implementation in the simulation.

SIMULATION IN DD4HEP:
- The VFS layout for the new L* is basically frozen and a VFS student
  is foreseen to work on the implementation of the simulation in DD4HEP,
  as well as later on the background simulations. 

TASKFORCES FOLLOW-UP:
- Anti-DID: 
  Alejandro Perez (IPHC postdoc) visits DESY next week to initiate his 
  contribution to BG simulations together with the DESY experts.
  The small anti-DID design needs input from the machine and the VFS detectors
  to make progress. A dedicated phone discussion will be organized between
  Christophe Berriaud and the CDI and VFS conveners to address the
  relevant points. 
- VT: 
  The AHCAL CAD model from DESY has been sent to M. Anduze and a dedicated 
  meeting is organised on January 25 with him to start the comparative 
  simulation of the mechanical behaviour of the full wheels. The DESY 
  experts will catch up with the study once they get results from Marc. 
  A promising evaluation of a mixed RPC/Sci simulation of hadronic showers
  has been performed in Lyon. It shows that the impact of the mixed setup
  on the RPC response is at the level of 2% only. It will be discussed with
  Lyon and DESY how to produce a similar study for the Sci response
  with minimal investment.

TECHNICAL SPACE IN CONFLUENCE
- A technical space has started to be framed by Karsten within the
  DESY ILD confluence system: 
  https://confluence.desy.de/display/ILD/ILD+Technical+Working+Group  
- The goal is to provide work space for repository of technical
  working groups documents. At least one co-convener per subdetector
  will need to have a DESY account to have write access to the 
  corresponding subdetector space. It will be checked how to protect
  the private work space from public access.

NEXT GENERAL TECHNICAL MEETING:
- It is necessary to organise an intermediate technical ILD meeting
  before the general LCWS meeting at SLAC end of June, in order to 
  provide a focusing milestone to ongoing work.
- Since experience of the Orsay November meeting has shown that
  there is a large overlap between the taskforce issues and other
  technical issues, it is proposed to organise a general (open) meeting
  gathering at minima all task force members, all technical conveners 
  and subdetector software contacts. 
- This o(2days) meeting will focus on ILD-specific technical issues 
  to be identified (initial list expected from Karsten and C.V.), 
  but could be appended to a more general software meeting in discussion
  otherwise.
- The meeting should be scheduled preferenly between end March and 
  early May. Overall schedule constraints will be gathered before
  doodling dates.    

NEXT VIDYO MEETING:
- Between 13th and 16th February, 10:00 CET, doodle to be distributed.

SUMMARY OF SHORT TERM ACTIONS (until next meeting) :
- Comments on interface document (all)
- Start ILD reference document (CDI)
- Start VFS BG simulations (IPHC) and VFS inclusion in DD4HEP (VFS)
- Organize Saclay-CDI-VFS phone meeting on small anti-DID 
- Define how to perform AHCAL study of mixed RPC/Sci simulation
- Trigger full calo wheel mechanical simulation (LLR meeting 25 January)
- Finalise technical confluence space frame (Karsten and C.V.)
- Clarify date and context of next general ILD technical meeting.