1. General remarks – only my point of view
General feeling:
Medical accelerators, light sources, technology transfer taking more and more importance and getting more and more interest
Less curiosity on current accelerator operation / improvements / first results with the exception of machine learning field
Seems that the community is more interested in accelerators application and working on these challenging topics – also maybe more resources available including for manpower resources
1 plenary session on first morning, then 2 parallel sessions (wrt 3 in the past), so more manageable for attending selected topics
Many, many posters, (daily, 16h to 18h) but rather well grouped by theme
Inspiring talks, e.g. in the opening plenary
11 June 2019
Reflections from IPAC, Melbourne, May Malika Meddahi

2. Reflections from IPAC, Melbourne, 19-24 May 2019 Malika Meddahi
Inspiring talks
‘Meeting future challenges in accelerators: innovation, collaboration and communication’ – Suzanne Sheehy (John Adams Institute, Oxford) Challenge 1: future colliders Keys: Size, Cost, Energy consumption, timescale, in addition to physics interest.
11 June 2019
Reflections from IPAC, Melbourne, May Malika Meddahi

3. Reflections from IPAC, Melbourne, 19-24 May 2019 Malika Meddahi
Inspiring talks
‘Meeting future challenges in accelerators: innovation, collaboration and communication’ – S. Sheehy (John Adams Institute, Oxford) – MOXPLM1
Challenge 2: global radiotherapy
Medical accelerators are and will be even more needed (annual global incidence of cancer is expected to rise from 15 million cases in 2015 to 25 million in Of these, 65-70% will occur in low-and-middle income countries. Key: Reliability, cost, expertise
Interdisciplinary collaboration needed – the best researcher profile?
The T-shape researcher: interdisciplinary collaborations have the greatest chance of success when researchers are 'T-shaped’- able to cultivate both their own discipline, and to look beyond it. Breadth and depth are key. Nature 525, , 17 sept. 2015
The social capital:
MIT scientists ran a study where they put people into groups and asked them to solve difficult problems.
The factors to group success were NOT IQ or average IQ, instead they were:
1. High degree of emotional intelligence (social sensitivity)
2. Giving equal time to all group members
3. More women in the group
“Creating a culture of helpfulness will outperform a culture that supports the individual contributions of superstars. Every time.” source :
11 June 2019
Reflections from IPAC, Melbourne, May Malika Meddahi

4. Reflections from IPAC, Melbourne, 19-24 May 2019 Malika Meddahi
The T shape researcher
11 June 2019
Reflections from IPAC, Melbourne, May Malika Meddahi

5. Reflections from IPAC, Melbourne, 19-24 May 2019 Malika Meddahi
MORE IN SPARES
11 June 2019
Reflections from IPAC, Melbourne, May Malika Meddahi

6. Reflections from IPAC, Melbourne, 19-24 May 2019 Malika Meddahi
Inspiring talks
‘From dream to reality: Prospects for applying advanced accelerator technologies to next Generation scientific user facilities’ – M. Ferrario (INFN/LNF) – MOXPLM2
Accelerator-based High Energy Physics will at some point become practically limited by the size and cost of the proposed e+e- colliders for the energy frontier.
Novel Acceleration Techniques and Plasma-based, high gradient accelerators open the realistic vision of very compact accelerators for scientific, commercial and medical applications.’
The R&D now concentrates on beam quality, stability, staging and continuous operation. These are necessary steps towards various technological applications.
The progress in advanced accelerators benefits from strong synergy with general advances in technology, for example in the laser and/or high gradient RF structures industry.
A major milestone is an operational, 1 GeV compact accelerator. Challenges in repetition rate and stability must be addressed. This unit could become a stage in a high-energy accelerator…
PILOT USER FACILITIES needed
11 June 2019
Reflections from IPAC, Melbourne, May Malika Meddahi

7. Windows (HiRadMat, beam dumps….)
‘Accelerator Vacuum Windows: A Review of Past Research and a Strategy for the Development of a New Design for Improved Safety and Longevity for Particle Accelerators’ – C. Ader (Fermilab) - WEXXPLS2
Safety has to continue to have high priority since the future experiments will involve higher beam intensities which may necessitate the more frequent need of beryllium as the foil material.
Fermilab plan on testing new materials which are stronger and less expensive than the typical materials we are using for vacuum windows in the accelerators, particularly beryllium.
Working on a new window design, and when the feasibility of a new window design is demonstrated, further irradiation studies in hot cells, which is typically used for target materials, will be done. Tests of the rectangular window design will be completed in the near future – ability to pivot between two vacuum chambers
A failure root cause analysis (FRCA) is used to help minimize or mitigate risk of potentially harmful effects associated with a vacuum window failure.
11 June 2019
Reflections from IPAC, Melbourne, May Malika Meddahi

8. Additive manufacturing
‘Is it possible to use AM for accelerator UHV beam pipes?’ – G. Sattonnay – WEXXPLS3
AM has revolutionized mechanical engineering - quick production of mechanical components with complex shapes.
AM by selective laser melting is an advanced manufacturing process which uses lasers to melt metal powders one layer at a time to produce final 3D components - could be used to make Ultra High Vacuum components.
Investigate reproducibility of AM 316L stainless steel properties for different specimen supplied by several manufacturers with the same SLM process
Problem of reproducibility (with same method of manufacturing) -> important to control the conditions of manufacturing
Outgassing rates : same values are obtained for AM tubes than for conventional counterparts → UHV compatible !
SEY of AM samples is similar to the one of conventional 316L after electron conditioning of both types of samples
The high surface roughness of AM components seems not to be a limiting parameter: further investigations are needed!
Is it possible to use additive manufacturing for accelerator UHV beam pipes ? Yes! But so far for specific components : e.g. Beam Position Monitors
11 June 2019
Reflections from IPAC, Melbourne, May Malika Meddahi

9. Additive manufacturing
‘Tests of a 3D Printed BPM with a Stretched Wire and with a Particle Beam’ – N. Delerue - FRXXPLS1
Successfully printed a beam position monitor using 3D printing – not for feedthrough
Passed ultra-high vacuum testing
Signal measured on the pick-ups compared to two conventional BPMs: no anomaly specific to the 3D printed BPMs.
Installed it in a beam line at the PhotoInjector at LAL (PHIL).
Gave position measurements with an accuracy comparable to that of other BPMs.
What’s next?
11 June 2019
Reflections from IPAC, Melbourne, May Malika Meddahi

10. Reflections from IPAC, Melbourne, 19-24 May 2019 Malika Meddahi
CERN presentations
Last week: 6 June pm : all but HL-LHC to be done at a later stage - available on → 14:30 LHC Injectors Upgrade Project: Towards New Territory Beam Parameters - Malika Meddahi → 15:00 Building the Impedance Model of a Real Machine - Benoit Salvant → 15:30 Operational Results of LHC Collimator Alignment Using Machine Learning - Gabriella Azzopardi → 16:00 The 2018 Heavy-Ion Run of the LHC - Speaker: John Jowett / Michaela Schaumann → 16:30 First Results of the Compensation of the Beam-Beam Effect with DC Wires in the LHC - Guido Sterbini → 17:00 Demonstration of Loss Reduction Using a Thin Bent Crystal to Shadow an Electrostatic Septum During Resonant Slow Extraction - Brennan Goddard
11 June 2019
Reflections from IPAC, Melbourne, May Malika Meddahi