DIRAC

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==== 28th DIRAC Working Group Meeting 2025, SDU, Odense, DK =====

=== June 3rd - June 6th (Arrival Monday June 2nd) ===

==== Location ====

//FKF Synergy meeting room// (not the same room as 2024! location: Ø10-506-2)

To get the SDU map link to the Synergy meeting room, type FKF in the search field at this link: [[https://clients.mapsindoors.com/sdu/573f26e4bc1f571b08094312/details/563cb992423b7d0540c9a84c| FKF Synergy meeting room]]

For DIRAC developers and invited guests, who cannot be present in person:
 (registration link for zoom follows a week before the meeting)


==== For new people ====

The DIRAC meeting is a family reunion for DIRAC developers and
DIRAC friends. It is a nice opportunity to meet the people behind
the DIRAC code. **There is no registration fee but for organization
purposes please add yourself to the participant list below** (send an e-mail to Hans Jørgen using hjj at sdu.dk if you do not have editing permission to this page).

Most people will stay at the campground (more info below). The cabins are very
good comfort, not expensive, and it's fun to be there. Book them well in advance.

We will discuss science but a significant part of the program
is reserved to discuss the future of the DIRAC code, programming,
code maintenance, release planning, as well as for programming task groups.

The meeting program is self-organised, simply add talks and
discussion points to the program.

==== How to get to Odense ====

Typically you will i) fly to Copenhagen and then take the train or ii) fly to Billund and then take bus to Vejle plus train Vejle-Odense.
From Odense train station you can take bus 35 (in the right direction!) or share cab to the
[[https://www.dcu.dk/en/dcu-camping/dcu-camping-odense|DCU-Camping Odense]].
If you arrive to Odense by train on a regular train ticket (expensive: 369 DKK), then the bus from the railway station to the camp ground (or any other destination in Odense) is included in the train ticket.
If you buy your ticket CPH -> Odense St. in advance (e.g. a month) on [[https://www.dsb.dk/en]], then you can buy a "DSB Orange ticket" (non-refundable) or a "DSB Orange Fri ticket" (refundable until 30 min before departure) for from 94 DKK or 157 DKK. They are only valid for a specific train, in contrast to the regular tickets which are valid for any train that day. Local buses are not included in the orange tickets. The closer you come to the travel day, the more expensive the orange tickets become.

==== Lodging ====

Make your cabin reservation at
[[https://www.dcu.dk/en/dcu-camping/dcu-camping-odense|DCU-Camping Odense]].
The cabins can accommodate 3-4 people so organize with others.
Use the dirac-developers mailing list.

A downtown hotel at the railway station: [[https://www.cabinn.com/en/hotel/cabinn-odense-hotel|CABINN Odense Hotel]].
You can find other hotels from around 500 DKK per night by searching google for "hotels Odense" and some BBs to less than 500 DKK. Note that hotels might be cheaper via their own web site than on hotels.com etc.

==== Local transport in Odense ====

Revised April 2024 by Hans Jørgen.

  * Note that the local bus lines have changed since the tram line was opened, so do not look for the bus numbers you used previously! 
  * Both the cheapest and the simplest is to use the new "Odense NU" mobile tickets: 15 kr for 26+, 10 kr if you are 25 or younger. They are valid for one hour for both buses and the tram, as long as you stay inside Odense Kommune. You can read the QR code at the tram stops to buy the ticket, or you can download and use the app "Rejsebillet". Or on [[https://www.odenseletbane.dk/english]].
  * In the "Rejsebillet" app (after having added a credit card and switched to English), choose "Special Tickets" and scroll for "Odense NOW". If you filter "Sold by Fynbus", it is easier to find it, because there are many special tickets!!!
  * Use [[https://rejseplanen.dk]] to find your best connection, for example to the campground. The railway station is "Odense St." and the campground is "DCU-Odense City Camp".
  * Even easier: Download the "Rejseplanen" app and use that. I use it every time I travel in DK!
  * Railway station - university: use Odense Letbane (tram, light rail). There is no direct bus connection Railway Station - university any more. Use QR code shown at tram stops or buy with the app "Rejsebillet". 
  * A map of all bus lines in Odense can be found [[https://fynbus.dk/filarkiv/Find%20din%20rejse/Kort/Rutekort/OBC_OdenseKort__regional_juli22.pdf|here]]


==== Participants (please add yourself) ====

//Please note arrival and departure if you will not participate the whole time.//

  - Hans Jørgen Aa. Jensen, Odense
  - Trond Saue, Toulouse
  - Ayaki Sunaga, Budapest 
  - Dávid Ferenc, Toulouse
  - Andre Gomes, Lille
  - Agustín Aucar, Groningen
  - Lucas Visscher, Amsterdam
  - Jan Brandejs, Toulouse
  - Radovan Bast, Tromsø
  - Gosia Olejniczak, Warsaw
  - Erik D. Hedegård, Odense
  - Ernst D. Larsson, Odense
  - Lena Nguyen, Odense

----
==== Work tasks (please add tasks) ====

  * Go through issues list
  * Update user documentation -- there are still quite a few references to DFCOEF file ...
  * Can keyword .OPERATOR also refer to pre-defined operators ?
  * Update developer documentation on release preparation
  * How to deal with setting the runtime environment correctly (openmp, gpu use)
  * Use subtree instead of submodule (suggestion hjaaj)
  * New testboard.org ? (cf. dirac-developers mail from Radovan 10.Mar.2025)
  * Get KR-MCSCF working in C1 symmetry ...
  * Checkpoint file: should we distinguish 4c vs 2c. MCSCF orbitals. Atomic vs. linear symmetry
  * unified tensor type tests -- towards merge -- probably needs 2 sessions as things develop
  * x2c multithreading bug

----
==== Possible items for the meeting, to be scheduled later ====

- Possibility to use predefined operators under .OPERATOR

- Jupyter notebooks for demonstration and python bindings in general
==== Prologue: Monday June 2 ====

  * Arrival
  * 19:30 [[http://www.orientalbarbecue.dk|Oriental Barbecue House (Slotsgade 20)]] - booked for 8 persons, Reservation in my name (TS).

----
==== Tuesday June 3 ====

=== The state of affairs ===

  * 09:00 -- 09:15 Opening, discussion of meeting program (Hans Jørgen)
  * 09:15 -- 09:30 Introduction round (everybody)
  * 09:30 -- 11:30 Overview of current and planned DIRAC developments by node leaders
  * 11:30 -- 12:00 Task group formation

=== Lunch ===

  * 12:00 -- 13:00

----

===  Discussions - Focus on ExaCorr ===
   * 13:00 -- 13.30 Jupyter notebooks for demonstration and python bindings in general
   * 13:30 -- 14:30 State of affairs wrt transition to TAPP[[https://github.com/TAPPorg/tensor-interfaces]] 
   * 14:30 -- 15.15 Desired features on top of TAPP: symmetry, denominate, rank reduction, ...
   * 15:15 -- 15:45 Development planning (who does what)
  
 ===  Workgroup Session === 
   * 15.45 -- 17.30 

==== Wednesday June 4 ====

=== Science with DIRAC ===

  * 09:00 -- 09:30 Adsorption energies calculations of Hg,Cn,Fl and Pb attached to a Selenium surface -- Miro Ilias (Zoom talk)
  * 09:30 -- 10:00 Towards rigorous QED corrections in diatomic molecules -- Dávid Ferenc
  * 10:00 -- 11:00 Coffee break and group picture
  * 11:00 -- 11:30 Linear dependency -- Trond Saue
  * 11:30 -- 12:00 Fermi-type nuclear model -- Ayaki Sunaga
  * 
=== Lunch  ===

  * 12:10 -- 13:30

===  Discussion session  === 
   * 13:30 -- 14:00 Can keyword .OPERATOR also refer to pre-defined operators ?
   * 14:00 -- 14:30 HDF5 
   * 14:30 -- 15:00 PE library 


=== DIRAC release ===

  * 16:00 -- 17:30  

=== Board game night  ===

  * 19:30 [[https://maps.app.goo.gl/sQht3pGUGkp8b9QP9|Papas Papbar]] (we can grab some food in the city center before)
==== Thursday June 5 ====

=== Science with DIRAC ===

  * 09:00 -- 09:30 Gitlab as host
  * 09:30 -- 10:00 Modernizing our cmake setup
  * 10:00 -- 10:30 Coffee break
  * 10:30 -- 11:00 TAPP -- Jan Brandejs
  * 11:00 -- 11:30 Response properties with Coupled Cluster -- Andre Gomes
  * 11:00 -- 12:00 Collaborative work (or more talks)

=== Lunch  ===

  * 12:10 -- 13:30
 
=== Technical issues (discussion sessions) ===

  * 13:30 -- 14:00 (collaboration, Hans Jørgen has an exam)
  * 14:00 -- 14:30 
  * 14:30 -- 15:00 

=== Collaborative work ===

  * 15:00 -- 17:30 

=== Meeting dinner ===

  * 19:30 Dinner at [[https://stormspakhus.dk/|Storms Pakhus]]

==== Friday June 6 (bonus) ====

  * Collaborative session (joint papers, joint programming efforts). 
  * 09:00 -- 09:30 Checkpoint files
  * 09:30 -- 10:00 
  * 10:00 -- 10:30 Coffee break
  * 10:30 -- 11:00 
  * 11:00 -- 11:30 
  * 11:00 -- 12:00 Collaborative work (or more talks)