Minutes of the LIS Section meeting held on 29th June 2009

Present: S. Aumon, G. Arduini, J. Barranco, H. Bartosik, E. Benedetto, R. Calaga, C. Carli, S. Gilardoni, G. Lund, M. Martini, E. Métral, Y. Papaphilippou, G. Prior, G. Rumolo, C. Zannini.

General Information (Gianluigi)

A group meeting will take place on Thursday 2/7.

From IEFC:

Y. Kadi has been mandated from Steve to collect the information on the resources required in the different groups for HIE-ISOLDE.

S. Maury will present the resource requirement for the SPS ion fixed target programme at the SPSC in September. Before that date he should present the results of his findings to the IEFC for approval.

PS vacuum leak: it is not yet confirmed that the failure of the RF bypass resistor was due to the peak current of the nToF beam. The RF team is looking into that.

J.J. Gras gave a Status of the instrumentation in the Injector Complex

Gianluigi reminded that in the future the wire scanners of the PS should be calibrated in the range +/- 50 mm (this year this was done in the range +/- 30 mm). BI is going to look for a solution for that

Prioritized list of topics to be studied for the replacement of LINAC2 Drift Tube quadrupoles. Richard proposed a series of studies that will cost ~0.3 FTE and 75 kCHF. The money will be provided by the department. The manpower can only be found by delaying the work on LINAC4. Paul agreed to give priority to the LINAC2 Drift Tube replacement study  

A new risk analysis review will be done to determine the priorities for the consolidation of the LHC and its injectors.

LHC:

HW commissioning for Sector 23 is going to stop on Tuesday 30/6.

During the week-end: Phase II powering tests have been performed on the main dipoles and main quadrupoles up to 1 kA to verify the performance of the new QPS system. The tests were successful and the preliminary results encouraging.

About 75% of the powering tests planned or the sector have been completed

Round table (all)

From E. Wildner (e-mail):

SPC neutrino panel presentation made last week:  required follow up being prepared (I will report possible experiments and research for Neon production, diffusion measurements of Boron, both these are ISOLDE activities), giving a clear view of which crucial issues have realistic estimates (based on experiments) and clearing out important research issues. 

Nufact courses almost finished (3 lectures on accelerator physics, beta beams and neutrino-factories).

As a member of the organizing comitte of nufact I have participated in the setup of the acc. Phys. session which is now about to be published 

Nufact plenary session presentation: work ongoing. 

3 day course on mediation attended this week (in all this is a 6 day course giving a certification as professional mediator).

Beta Beam production ring issues:

Guiding lattice design (a first version now starts to emerge, has to be improved)

Guiding the work using Geant4  for  producing sufficient amount of ions for neutrino production, the shape of the target, calculationg the emmittance growth of the circulation beam, recording the angular scattering of the produced ions to be collected,  RF issues (start of cooling work). The work has advanced so we can start to discuss complete simulation of the ring. Some production issues still to be solved (choice/existence of physics models at lower particle energies).

Intra-beam scattering (with Michel M): essentially the conditions and properties of the beam for input into code.

Elias and Giovanni have given a course on collective effects at the USPAS (see http://emetral.web.cern.ch/emetral/)

Elena Benedetto is working with M. Schaumann at the design of the lattice for the production ring for the beat-beams. The option(proposed by C. Rubbia) is being investigated and foresees a gas (lithium, Helium or Deuterium) jet target. Gianluigi said that LEIR could be used as a possible model to be scaled down. Elena replied that they are considering this option but they still problems with the lattice. Gianluigi encouraged Elena to discuss with Christian. The work on the Beam stability in the SPL - Proton Driver accumulator for a Neutrino Factory at CERN has been completed and will be presented at NuFact09. Elena is also writing an MD note on the studies conducted in 2007-2008 with the SPS matching monitor.

Giovanni reported that a carbon coated vacuum chamber (coated at CERN and similar to those installed in the SPS) has been installed at CESR-TA. He will go to Cornell at the end of July together with S. Calatroni to follow-up the studies. The coated vacuum chamber has been installed downstream of a dipole and the electron cloud build-up will be compared with that in a reference Aluminium vacuum chamber.

Gersende: the work on the neutrino factory front-end is progressing. There are some issues with the MARS version at CERN. A review of the baseline design is planned for Decembr and it includes a comparison of the CERN design. Gersende is in contact with A. Lombardi and S. Gilardoni to recover the information on the CERN design and to start from that for the comparison. The frequency of the cavities will have to be modified from 44-88 MHz to 50-100 MHz as compared to the initial design.

Michel has run ORBIT simulations with realistic distributions resulting from injection painting.100000 and 500000 macroparticles have been considered. No significant blow-up has been observed for the ultimate LHC beam (3.25x1012 p/bunch) for the first 10000 turns (~10 ms).

MTE commissioning (Simone). Still unequal sharing among core and islands. The possibility of going back to the old working point is being considered. The PS is otherwise running relatively well, although from time to time BFAs are not pulsing correctly. The optics of the TT2 transfer line for the CNGS beam has been changed empirically by the operators. The nominal optics should be reloaded ==> PS supervisors.

Impedance measurements are planned for the end of the week. Gianluigi encouraged complete the analysis of the data on impedance localization performed in the past.

Christian mentioned that the PSB injection geometry with LINAC4 has been finalized (BT proposal but with larger injection bump amplitude as suggested by Christian and Michel Chanel). Progress has also been done in the definition of the RF LINAC4-PSB interface. Matthias has started some simulations with ORBIT.

LEIR cold check-out progressing. Several controls problems have been encountered and are being solved. LEIR is used as test bench for INCA. S. Pasinelli (OP) is helping in the debugging. RF tests are ongoing. There are problems with the new controls of the ramping cavity. RF and CO are working on that. This prevent PPM operation of the ramping cavity.

LEIR commissioning with beam is supposed to start on Monday 6/7 and it 3 weeks are allocated for that.

Yannis has continued the tests for the "long" LHC and fixed target cycles in the PS in view of a possible operation without rotating machine. The MD ended prematurely because of a power cut.

PS2 (Yannis, Hannes, Javier): discussions are ongoing for the space requirements for the straight sections and for the magnets. Yannis has proposed to use a doublet solution for the straight section. Hannes has progressed in the tunability study for the present PS2 lattice investigating the tune range QH=18-19 and QV=8-9. A few quadrupoles are reaching operational gradients close to 18 T/m. Chromaticiy correction for all these cases has been considered as well. Javier has conducted a parameter scan for the collimation system (length and material of the collimators).

Gustav has estimated the IBS growth time for the beta beam decay ring. The estimated shorter growth time is 1000 s. IBS is therefore not an issue.

Next meeting

Monday, 27th July 2009 at 14:00 in room 354-1-001

Agenda:

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