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LHC Collimation Working Group |
Topics for future meetings
| Definition of priorities | highest | High risk topics (risk of major design changes, risk of failure). Time scale is weeks. |
| high | Possibility of major changes in design, machine layout or number of components. Time scale is weeks to a couple of months. | |
| medium | Important topic with a medium time scale. Several months. In specific cases the time scale can extend to several years. | |
| low | Important topic with a long time scale of several years. Or a topic of low importance. | |
| Energy Deposition Studies | Priority | |
| Optimal location of BLM's for collimator tuning in SPS | DONE | FLUKA team, IHEP |
| Overall IR7 layout: First results on required absorbers and locations | DONE | FLUKA team (PDF, PDF, PDF) |
| Energy deposition in vacuum flanges for various beam loss cases! | DONE | FLUKA team AT-VAC (PDF) |
| Radiation in the RR's of IR7 and required shielding | ON-GOING | FLUKA team (PDF, PDF, PDF) |
| Shock heating of water in collimators | highest | FLUKA team |
| Radiation effects on the optical fibres for BLM's | highest | FLIKA team |
| Material for tertiary collimator: W or Cu? | DONE | FLUKA team () |
| Overall IR3 layout: Update on required absorbers and locations | DONE | IHEP, JBJ (PDF, PDF) |
| Energy deposition to vacuum pipes in complete insertions. Propose locations for cooled pipes. | high | FLUKA team, IHEP |
| Heating of components in case of accident. | high | FLUKA team (PDF) |
| Estimate of Ozone for IR7 | high | FLUKA team |
| Impact of imperfections on energy deposition | high | FLUKA team, IHEP |
| Quench limit versus deposited energy for the superconducting links at IR3 | Layout frozen! | R. Assmann, R. van Weelderen, JB. Jeanneret, I. Bayshev (PDF) |
| Optimal location of BLM's for the LHC | medium | FLUKA team, IHEP |
| Use of high Z material for primary collimator? | medium | FLUKA team |
| Showering studies for phase 2 collimation | medium | FLUKA team |
| Showering studies at specific locations of beam loss | medium-low | FLUKA team |
| Showering studies for tertiary collimators at IR1, IR2, IR5 and IR8 | medium-low | FLUKA team, IHEP, Mokhov |
| Tuning studies with shower maps (beam loss measurements) | low | FLUKA team, IHEP |
| Operational studies (different configurations of collimation) | low | FLUKA team, IHEP |
| Heating of front and end plate in collimator tank | done? | FLUKA team |
| Heat load to springs in the collimator jaws: Equilibrium temperature & radiation resistance. | done? | FLUKA team |
| Collimator prototype: Precision and control - SPS test | ||
| Packages for control | DONE | M. Jonker, R. Assmann |
| Components (motor, sensors, cables, ...) | DONE | S. Redaelli, F. Decorvet |
| BLM's and DAQ for collimator tuning in the SPS | DONE | B. Holzer, G. Robert-Demolaize |
| Planning for beam measurements in SPS MD's | DONE | R. Assmann/G. Arduini (PDF) |
| Results from collimator tests in the laboratory (measurements with motors/sensors) | DONE | S. Redaelli (PDF) |
| Results from collimator tests in the laboratory (mechanical measurements) | DONE | O. Aberle |
| BLM's and DAQ for collimator tuning in the LHC | medium | B. Holzer |
| Machine protection constraints for collimator control | medium | R. Schmidt |
| Impedance estimates for the SPS | DONE | Impedance team (PDF1, PDF2, PDF3) |
| Vacuum test results | medium | M. Jimenez, A. Rossi |
| Collimator design | ||
| RF contacts and expected impedance | DONE | S. Calatroni, Impedance team (PDF) |
| Radiation resistance of graphite (experimental tests) | high | O. Aberle |
| Erosion damage of copper cooling lines due to high water speed | high | |
| Measurement plans for HOM's | DONE | F. Caspers, T. Kroyer (PDF) |
| Wire measurement of impedance with uncoated jaws | medium | F. Caspers |
| Radiation resistance of NEG coating | medium | AT/VAC, TS |
| Basic design parameters for different devices | DONE | R. Assmann (see here) |
| Operational aspects | ||
| How many BLM's per collimator? | highest | |
| Detection of beam impacts with accelerometers/microphones | DONE | S. Redaelli, G. Spiezia, A. Masi |
| Test program for motors | high | |
| BPM systematics with beam loss | high | B. Holzer (PDF) |
| Reliability study for collimators in hostile environment | high | |
| Pollution of BLM signal from e.m. noise of other devices (motor, ...) | high | |
| Development of maintenance procedures for servicing/exchanging collimators | high | |
| Requirements for alignment in cleaning insertions | medium | J. Wenninger? |
| Expected beam loss at the collimators | medium | M. Lamont |
| Overall control software for all collimators, including BLM | medium | |
| Study of failure scenarios and estimate of unexpected downtime per year | medium | |
| Accelerator physics | ||
| Detailed loss maps | high | S. Redaelli, G. Robert-Demolaize, R. Assmann |
| Efficiency and tolerances | high | G. Robert-Demolaize, S. Redaelli, R. Assmann |
| Tracking tools with detailed aperture models | medium | G. Robert-Demolaize, S. Redaelli, R. Assmann |
| Basic simulation of set-up (how many collimators for what intensity - required set-up accuracy - achievable performance) | medium | G. Robert-Demolaize, S. Redaelli, R. Assmann |
| Simulation of fine tuning during collision and nominal performance | medium | G. Robert-Demolaize, S. Redaelli, R. Assmann |
| Expected performance of tertiary collimators | medium | |
| Use of high Z material for primary collimators | medium | R. Assmann |
| Effect of showers induced by lost particles around the LHC ring on the quench performance of superconducting magnets | medium | |
| Use scraper below depth of TCP's? | low | R. Assmann et al |
| Phase 2 collimation | ||
| Plans for transition from phase 1 to phase 2 collimation and for installation of phase 2 collimators | high | R. Assmann, E. Chiaveri |
| Loss maps for phase 2 | high | R. Assmann |
| Brain-storming on innovative phase 2 solutions (goal is to select a few promising paths for prototype studies - including SLAC/US-LARP) | medium | |
| Review SPS/TT40 measurements | ||
| Aligning the SPS collimator with the BLM | Collimation team/BLM team | |
| Heating of collimator jaws with beam | DONE | S. Redaelli, G. Robert-Demolaize (PDF) |
| Mechanical and sound vibrations induce by the beam on the collimator | A. Masi, G. Spiezia, S. Redaelli (PDF) | |
| Review of HOM's measurements at the SPS | DONE | F. Caspers, T. Kroyer (PDF) |
| BBQ tune measurements versus collimator position | DONE | M. Gasior, R. Jones (PDF) |
| Standard tune measurements with different collimator openening | H. Burkhardt | |
| Comparison between measured and expected impedance | ON-GOING | E. Metral, F. Zimmermann |
| Experience with BLM's (SPS + TT40) | DONE | B. Denhing, B. Holzer, L. Ponce(PDF) |
| Experience with sensors for position measurements (LVDT's, potentiometers, palmer, ...) - achieved versus expected performance | O. Aberle, F. Decorvet, R. Losito, S. Redaelli | |
| Vacuum of the SPS versus collimator settings | V. Baglin, A. Rossi | |
| Adjusting the collimator angle to the beam profile? | R. Assmann, M. Jonker, S. Redaelli | |
R. Assmann / S. Redaelli, 08/18/2005