Cafe neutrino meeting minutes (05/10/10)
Present: A. Blondel, E. Efthymiopoulos, C. Hansen, M. Martini, G. Prior, T. Stora, S. Vij, E. Wildner
Agenda:
Summary of worskshop on neutrino detector studies (A. Blondel): (.pdf)
AIDA is the Advanced European Infrastructure for Detectors and Accelerators. Goals is e.g to fund common detector R&D projects for Super-LHC, Linear Collider, neutrino facilities and B-factories in Europe (see P. Soler talk at http://indico.cern.ch/conferenceDisplay.py?confId=87234). Had a meeting on possible neutrino experiments at the CERN PS building on CDHS and BEBC experiments. The idea is not anymore to refurbish Gargamelle chamber. Little workshop. Mailing list with people interested in detectors. Slide 2: uses 1 GeV neutrino beam. On CDHS paper can see a single horn was used, better horn system could be built. Tunnel is in very good condition but nothing left. No remnant (or very little) radioactivity. Cables may be a little hot (1999). Ideas are to make an LSND exp. cross-check and bring ICARUS module and put in BEBC hall. A little LAr detector could be used as ND. MiniBooNE is one detector, HARP measured cross-section for MiniBooNE but neutrino cross-section simulation need a better understanding, also low-E excess events from MiniBooNE need to be understood. Looking into what kind of physics can be done at the ND. Slide 3: flux in neutrino per GeV.m2.pot but units not clear, need more precision. Slide 4: neutrinos flux with different off-axis radial position. In magenta corresponds to T2K off-axis angle. Plot of the peak energy versus off-axis distance at 127 m. Slide 6: Minerva will do well at 1-10 GeV for the neutrino energy. Slide 7: Three approaches to the physics case. Still need low-E cross-section and Minerva & T2K will fully not do it. The SPL beta-beam scenario at CERN needs it. An EOI (Expression of Intention) will be drafted. Slide 8: TASD triangular bars of 12 m length. Ideally want to get big enough to have more area in the off-axis than the on-axis position. Slide 9: Building 181 contains the LHC quadrupole repair facility will have to deal with space occupancy. Slide 10: Need a magnetised muon spectrometer. Slide 11: INO detector is with RPCs. Slide 13: measurement of wavelength shifting with long fibers, 1 cm thick scintillators with a fiber running along it. Slide 15: how to measure cross-section with one detector ? Can NA61 cover the whole T2K acceptance ? Need to measure the flux. Can we measure electron neutrinos. From super-beam get some νe but hardly enough events. E = 2.Q.γ so we need the SPS type of rigidity (mini-BB). Muon storage ring ? Slide 16: can we do cooling and acceleration ? How do we store muons ? (~ 600 MeV/c μ). Slide 17: can tolerate a two-detector system with different material. Can be formed in one single collaboration but would need to coordinate the detector technology performance and physics reach. Student of Alain working on the flux calculation. Assuming 2.5 1020 pot, FD would get 940 QE evts/ton and ND 30000 QE evts/ton. Beware of the tail of the neutrino flux. Ratio peak-to-tail need to be calculated. Recalculation to be computed too. Fairly good collaboration with UK, Italian, French, Spanish and Russian. BB: do we need both ν and anti-ν's ? If one species could be chosen, it would be much easier. Can we consider a little storage ring with PS rigidity at 20 Gev ? Can we give a boost in the storage ring (e.g fill-boost-fill-...) ? νe would be interesting for Hi Isolde ? Post acceleration 10 MeV/u. Straight section 30 m would need to calculate the rate. Few months measurements. Is there something similar to 8Li on the neutrino side ? 8B being forced by the neutrino community.
Summary of EUCARD/NEU2012 meeting (A. Blondel):
Some of the participants could not come due to the volcano eruption. Revival of the Muon Collider program through MAP (Muon Accelerator Program) was mentioned. If CERN wants to be on the boat need a lab to lab discussion on costing and target. Seems that now the muon-collider is almost on equal footing compared to NF. The CERN SPC report was also discussed. Lot of questions and concerns about the path to the LHC upgrade. Need to understand better what wil be the LHC upgrade path. There was a request of manpower and numbers and figures given. Nothing is in the summary but the full report has been given to CERN management. SPC panel emitted a reservation on the fact that there should bea neutrino group at CERN, in comparison with CERN priority. More concrete proposal is to rebuild a neutrino beam in the PS area. More people will be joining but better to have them in a team instead of one person here, one person there. Find one/two areas where CERN can make a contribution and a significant impact.
NUFACT'10 - Mumbai 20-25 October (E. Wildner)
Elena W. is organizing the Accelerator Working Group. If you think there are interesting things that should go to a plenary or in the agenda, please let her know.
Large bore magnet (G. Prior)
Mid-2008 Gersende started to look for a large bore magnet from CERN that could be either transported at the MTA or stay at CERN in an experimental area to be used for RF breakdown R&D experiments in support of the NF R&D work done at MTA. Recently (thanks to E. Wildner & C. Vollinger) she could contact the CMS people who are using M1 large bore (radius > 60 cm) SC magnet (3T in the magnet center) built for NA22/RD5 experiment in the 1980's and currently in use for the CMS pixel detectors test. It sits in the T2-H2 beam area and may be a good finding. Will be discussed later this week during the NF-FE phone meeting if we want to start to look into a cavity or would be interested in shipping it. Regarding cavities we should contact Daresbury and ask about power-units. They have 200 MHz 4 MV (?) RF cavities. ALEPH had 200 MHZ amplifiers ? Need also to loook into safety issue, what kind of additional shielding would be needed to shield from X-rays or electrons coming out of the cavity (will need simulations).
Next meeting:
May 24th - cancelled (Pentecost)
June 7th - 10h30 in 354-1-001 (NOTICE CHANGE OF ROOM)