Minutes of the LIS Section meeting held on 16th January 2012
Present: G. Arduini, H. Bartosik, C. Carli, A. Garonna, S. Gilardoni, A. Lachaize, Y. Papaphilippou, R. Wasef, C. Yu
General Information (Gianluigi)
Elena Benedetto has been hired as a staff in the LIS section starting on 1/2/2012. She will join the effort for the PSB upgrade studies.
Gianluigi gave a brief summary of the Evian meeting. High luminosity proton experiments are asking for an integrated luminosity of 20 fb-1 in 2012. Operation at 50 ns is the favored scenario thanks to the high brightness that can be achieved in the injectors (1.6x1011 p/b and 2 um transverse emittance). Operation with 25 ns would imply lower brightness and would require a much longer scrubbing run. Operation at 4 TeV is very likely and beta* as low as 70 cm is within reach. This would allow achieving peak luminosities of 6-7x1033 cm-2s-1 with a pile-up just above 30 that should be handled by the experiments.
5 new posts for accelerator physicist/engineer are opened in ABP.
Round Table (all)
Simone
New Chair (K.
Cornelis replacing S. Maury) and new Deputy Chair (S. Gilardoni replacing K.
Cornelis). Scientific secretary: G. Bellodi, possible replacement being
discussed (F. Roncarolo is a possible option).
·
Current
status and future outlook /plans for POPS – F. Boattini (20')
·
Radiation
survey results at the end of the 2011 run
Operation with POPS
for 1/3 of the operation time. Teething problems found related to the design of
some of the components. 10 kHz noise (~0.02 in tune) still visible even after
modification of the active filter. The impact on MTE remains still to be
assessed. A possible operation in degraded mode is going to be tested in order
to verify the possibility of running with POPS even in case of limited failures.
Radiation survey. In
general a reduction of the remanent dose by 10-20% has been observed in all
machines and transfer lines although the total number of protons has slightly
increased. This is likely the effect of the reduced intensity at which CNGS has
been operated in the last part of the run (LHC type beam for CNGS measurement of
the neutrino speed).
Simone mentioned that the wire scanners without ferrites were going to be installed because no ferrites were available and because the ferrites available were degassing too much after the tests done by VSC. Gianluigi suggested to contact Elias, Benoit or Fritz to see whether they would have spares. Ferrites from AA have been used for installation in LHC.
The electrostatic extraction septum SEH31 (used for CT extraction) and the extraction magnetic septum SMH16 (used for all extractions to the SPS) and the SMH57 (slow extraction) will be replaced with their spares. The injection septum SMH42 has not been replaced yet.
Antoine
MTE: preparation of the paper summarizing the studies on the extraction stability. The effect of the preceding cycles and the minimization of such effect by inserting a 26 GeV cycle in front of the MTE cycle was confirmed. The decay of the tune at flat-top is going to be studied. The results of the coupling measurement seems to be in disagreement with the measurements done by E. Metral in the past, this could be due to the recent re-cabling of the skew quadrupoles and the machine realignment although the realignment should give a hange in the coupling independent from energy.
Raymond
Preparing to launch multi-particle tracking simulations with ORBIT-PTC in view of Sasha arrival.
Christian
verifying the results of the simulations conducted by Vivien Reginel on the performance of 50 MeV injection from linac 2 and linac4. Surprisingly the simulations indicate that the linac 4 at 50 MeV could allow producing LHC beams with nominal parameters with 7 injected turns.
Jean-Baptiste Lallement has found a solution for the LINAC4 measurement line LBS (energy measurements). There were issues with the instrumentation and with the design of the line. The proposed solution would allow using magnets from the standard series.
Christian attended to a review of the transfer line and dump of a deuteron linac for IFMIF. The main aim would be the production of neutrons with energy spectra similar to those produced by fusion processes and test material resistance. The main issues are related to machine protection
Chenghui
He is continuing his work on a new optics for the PS injection region aiming at minimize the losses there by minimizing the beam size in that area. Two solutions have been investigated:
inducing a beta beating using the QKE16 quadrupoles this affect a large area of the machine but it has the advantage that it does not require any hardware modification. A solution has been found for the matching of the injection line by the ABT colleagues. An experimental test is planned once the machine is running
Inducing a local beta bump by the installation of two additional
quadrupoles, this would require the installation of additional
hardware. The matching of the line has not yet been found.
Adriano
has started to look at the design parameters of a slow
extraction in LEIR. Possible options: longitudinal kicker using the RF Finemet
cavities of LEIR, transverse noise excitation or a betatron core (similarly to
what is used at CNAO).
Hannes
writing the thesis. Gianluigi agreed that this should be now the priority for Hannes.
Yannis
Work is ongoing for LAGUNA (in spite of the fact that we did not get the fellows we requested) to prepare a 3-day workshop in Paris. The physics requirements need to be clarified. As much as possible the PS2 design will be reused with some optimization to account for the different scope of the machine for neutrino physics. An high power low energy accumulator will be also revived (work was done for a neutrino factory in the past).
Yannis is contributing to the analysis of the modifications of the LSS3 RF upgrade and evaluate their impact on instrumentation.
Next meeting
Monday, 30th January 2012 at 14:00 in room 6-R-012
Agenda:
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