1. International AXion Observatory (IAXO) status, near-term plans and milestones Igor G. Irastorza (U. Zaragoza) on behalf of the IAXO collaboration Physics Beyond Colliders, CERN, March 2nd 2017

2. IAXO experiment reminder
Next generation “axion helioscope” after CAST
Purpose-built large-scale magnet
>300 times larger B2L2A than CAST magnet
Toroid geometry
8 conversion bores of 60 cm Ø, ~20 m long
Detection systems (XRT+detectors)
Scaled-up versions based on experience in CAST
Low-background techniques for detectors
Optics based on slumped-glass technique used in NuStar
~50% Sun-tracking time
Large magnetic volume available for additional “axion” physics (e.g. DM setups)
IAXO conceptual design
IAXO pathfinder system at CAST
In operation in
Last CAST results to be soon publisehd
(under review by Nature Physics)
Beyond Colliders, CERN, March-17
Igor G. Irastorza /
Universidad de Zaragoza

3. Igor G. Irastorza / Universidad de Zaragozaof
IAXO in the axion experimental landscape
Transparency ALP hints accesible to IAXO & ALPS-II
Few meV scale QCD axion & star cooling anomaly hints accesible to IAXO
ALPS-II
Igor G. Irastorza / Universidad de Zaragoza

4. Universidad de Zaragoza
IAXO physics update
IAXO physics case has been considerably sharpened in the last years
IAXO is now an established concept often referred to by papers by theorists/phenomenologists
“IAXO physics potential” long paper under preparation by the collaboration
IAXO is the only technique able to explore this region of the axion/ALP parameter space
An ALP miracle?
Daido et al.
arXiv: v1
Inflation and dark matter with an ALP
M. Giannotti et al, in prep.
Beyond Colliders, CERN, March-17
Igor G. Irastorza /
Universidad de Zaragoza

5. Universidad de Zaragoza
IAXO status of project
2011: First studies concluded (JCAP 1106:013,2011)
2013: Conceptual Design finished (arXiv: ) and LoI to CERN SPSC [CERN-SPSC ]
2014: Positive recommendations from SPSC.
: Transition phase towards TDR (technical design)
Engaging funding agencies
Community meetings in many countries
Preparatory activities (IAXO pathfinder system at CAST)
Preparation of collaboration bylaws and MoU to carry out TDR work.
First discussions on experimental site options
First discussion on long-term plan to build full experiment
2017: Formal constitution of collaboration (expected for summer)
“Founding” IAXO collaboration meeting to happen 3-4 July 2017, DESY
Beyond Colliders, CERN, March-17
Igor G. Irastorza /
Universidad de Zaragoza

6. IAXO near-term milestones
Secure funding for TDR activities
Some funding already obtained, several other application under review or to be submitted (see next slide). Important funding roadmap in the next months
Mini-IAXO concept under study at the moment: will impact TDR plans
Define longer-term stage to construction
DESY agreed to study technically viable places to site IAXO at DESY
Next (“founding”) collaboration meeting to happen at DESY (3-4 July)
Consolidate and formally establish collaboration
Interim steering committee working for a few months to establish collaboration
Bylaws document produced and MoU under preparation
To be signed in the collaboration “founding” meeting next July
Beyond Colliders, CERN, March-17
Igor G. Irastorza /
Universidad de Zaragoza

7. Universidad de Zaragoza
TDR “funding status”
Country/agency
Status of funding request
Topic
Croatia
Approved
Phenomenology
France, ANR
Application submitted. Under review by agency
Detectors
Germany
Under preparation
Detectors, magnet, infrastructure
Italy, INFN/INAF
Under consideration
Optics, magnet
Russia, INR
transversal
Spain, MINECO
Detectors, phenomenology
US, LLNL
Optics
US, NSF
Optics, phenomenology
CERN
Standby/preparation (*)
Magnet
+ Limited internal funds already available for some groups
+ possibly others under discussion
Beyond Colliders, CERN, March-17
Igor G. Irastorza /
Universidad de Zaragoza

8. IAXO TDR baseline plans
IAXO-T0: demonstration coil magnet
IAXO-X0: prototype x-ray optics
IAXO-D0: prototype low background detector setup testing different technologies for detector
Studies to refine IAXO physics case
Additional physics potential (DM options)
Site studies
Structure collaboration
IAXO-D0 Micromegas
IAXO-T0
IAXO-X0
Beyond Colliders, CERN, March-17
Igor G. Irastorza /
Universidad de Zaragoza

9. Extended TDR (Mini-IAXO / BabyIAXO concept)
Alternative magnet designs
Pros: higher FOM with less conductor, modularity
Cons: higher risk  need intermediate demonstrating magnet prototype
BabyIAXO concept:
Test magnet design at relevant scale (only 1 bore full diameter)
Test bench for optics + detector
Will deliver relevant physics (at intermediate level)
Will better mobilize community & increase interest
Better (and more staged) access to funding
Effect on near-term planning under study
Single 60-cm bore
Several conductor
configurations
under consideration
Beyond Colliders, CERN, March-17
Igor G. Irastorza /
Universidad de Zaragoza

10. Universidad de Zaragoza
IAXO and CERN
IAXO magnet makes use of unique expertise of CERN in the development of large escale (“detector”) superconducting magnets
CERN detector magnet group (H. ten Kate) already involved in CDR magnet work.
CERN support is critical in the design (TDR) and construction of the IAXO magnet.
Update request will be submitted, within new context put by the possible DESY site + mini-IAXO concept.
Beyond Colliders, CERN, March-17
Igor G. Irastorza /
Universidad de Zaragoza

11. IAXO proto-collaboration
Big effort to strengthen collaboration  large consortium involved in a number of funding applications, covering all TDR needs
Zaragoza (Spain)
CEA-Saclay (France)
Mainz (Germany)
Bonn (Germany)
Heidelberg (Germany)
INR-Moscow (Russia)
LLNL
Columbia
MIT
INAF-Milano (Italy)
DTU (Denmark)
RBI (Croatia)
DESY (Germany)
U. Hamburg (Germany)
U.Valencia (Spain)
U. Cartagena (Spain)
ICCUB Barcelona (Spain)
INFN-Frascati, (Italy)
U. Barry
S. Carolina
+ …
CERN
INFN-Genoa
CEA/Saclay (France)
New partners welcome…
(*) Only shown groups for which formal activity is ongoing or under discussion/preparation.
Potential interest in more groups than shown
Beyond Colliders, CERN, March-17
Igor G. Irastorza /
Universidad de Zaragoza

12. Universidad de Zaragoza
Conclusions
Important steps towards collaboration establishment have been done in the last months
Collaboration bylaws, MoU draft and founding meeting next July
DESY as possible site for IAXO  towards a longer term strategy
miniIAXO / BabyIAXO  new concept that can
Enhance final FOM of experiment
Catalyze near-term activities in the collaboration towards an intermediate experiment with relevant physics outcome
Important milestones in the next months:
Funding-wise: several applications under review + under preparation
Collaboration-wise: founding meeting at DESY
Extended TDR: conclude mini-IAXO studies and integrate in near term plans.
Better defined plans to be presented in next meeting
Beyond Colliders, CERN, March-17
Igor G. Irastorza /
Universidad de Zaragoza