Mail d'Akira
Bonjour à toutes et à tous,
I am (finally) at home in Tokyo for vacation. I will skip this meeting (sorry but family party is planned) but here is the update from my side:
- RF school in University of Hamburg in August
was successful. We had students from axion (MADMAX) and gravitational wave searches (MAGO). I also covered relevant subjects of accelerators. I am wondering how we can localize this type of education in Orsay...I am collaborating with CMB people in IAS to share microwave equipment. The potential audience is master-PhD students in Physics Department or Engineering school who are interested in application of RF/microwaves for fundamental physics (dark matter search, gravitational waves, CMB, accelerators, etc)
Nagoya University is inviting me to give a similar lecture courses with particular focus on axions in March next year...to be confirmed. I may have another visit to KEK around this time.
- I will work at KEK next week for cavity heat treatment
This is a general R&D efforts toward high-Q/high-Gradient superconducting cavities with a primary focus on FCC/PERLE 800 MHz cavities. The idea is to try to re-do the same recipe at KEK as we did in IJCLab last year. We have not fully excluded potential contamination in IJCLab's furnace. This time, we treat small Nb samples for material studies. This is PhD project of Chahinez and the samples were prepared at TRIUMF. I will have multiple strategical meetings with KEK colleagues including FCC 400 MHz Nb/Cu cavities. I also meet a guy from INFN-LASA staying at KEK to talk about research collaboration.
- SRF2025 conference in The University of Tokyo:
Two students of us (Chahinez and Camille) will provide contributed talks. We have around 7 posters from IJCLab and coauthoring PIPII and FCC related invited talks. I will be chairing a Hot Topic Session 2 "high-Q/high-G"
- The public tender of PERLE 800 MHz cavities are on-going / fabrication of FCCee 800 MHz prototype is on-going at CERN
We order only fabrication process to the industry. I am preparing electropolishing (surface etching process) in CEA by using "Ninja cathode" from MARUI. The design is fixed for both PERLE and FCC cavities. I am waiting for quotation of these cathodes. We will use our vacuum furnace for heat treatment so the tests in KEK with 1.3 GHz prototype is crucial before we do anything with 800 MHz.
- I am trying to organize some tests of JLAB 800 MHz prototype (same design as PERLE) repaired by CERN workshop in July.
We can do buffer chemical etching in IJCLab. We are finalizing the design of cryostat modification to be paid by the successful P2I funding "superCav". I am still looking for a way to test this cavity in another lab to give a "reference point" because testing a new cavity with a yet-to-be-qualified cryostat will generate a lot of doubts on the results. Remember that super high-Q cavity is very sensitive to to environmental effects like residual magnetic fields and you can easily interpret the data wrongly if the measurement devices are also uncertain. JLAB said No for such a test. FNAL has been silent. I may talk to CERN and INFN-LASA. Unfortunately, KEK is dedicated to 1.3 GHz.
- Two PhD students will start from Oct 1
1) Axel (detector experiment during master) will work on RF wakefield (0-40 GHz) absorbers for PERLE/FCC. We have a successful GS transverse funding to prepare equipment and P2I funding "cryoEpsilon" to procure dielectric samples. His PhD is with a company ACS with CIFRE.
2) Carlos (QCD theory during master) will work on non-relativistic quantum field theory of superconductors aiming at development of high-Q cavity theory. This is supported by CNRS-UChicago joint-PhD program and successful FACCTS funding in the UChicago side.
Carlos and I will visit the Chicago region (FNAL and ANL) in the 2nd week of December for kick-off meeting of UChicag-CNRS collaboration. I will give one seminar about axions in Enrico Fermi institute of UChicago as well as superconducting cavity seminars in FNAL and ANL (to be confirmed)
- One post-doc (superconducting cavity/magnet expert) applied to Star\Phi. The idea is to lead the fundamental R&D of superconducting cavity physics. He is applied physicist and has strong background about superconductors.
- I am wondering if I submit something to ANR this year...almost zero hope for superconducting cavities (not fancy enough / too expensive) but general dielectric studies for MADMAX and FCC/PERLE might sound attractive...
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Merci et bonne journée
Akira
Mail d'Angeles
Dear Akira,
Thanks for all this info.
I have some questions:
1) The cavities to be tested are monocell or multicell cavities?
2) are you planning some tests in our vertical in a future?
Indeed, I could not join you because I have a Copil meeting.
From our side, we have retaken the activities after the summer break.
- Anna is advancing in the monochrom optics and this year we will be focusing on the possible experimental test in bepc or SuperKEKB. She will participate also in the operation of ATF2 in December 2025 via EAJADE.
- I am deeply involved until December in the cern SPC and the briefing book for ESPPU.
Enjoy the meeting
Angeles
