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CLIC Technical Committee - Meeting #66
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Europe/Zurich
112/4-C17 - EN-ACE Group Leader meeting room (CERN)
CLIC Technical Committee - Meeting #66 (12 Dec 2012)
Present: Kurt Artoos; Francesco Bertinelli; Nuria Catalan Lasheras; Ahmed Cherif; Roberto Corsini; Mick Draper; Cedric Garion; Andrea Jeremie; Thibaut Lefevre; Helene Mainaud Durand; Michele Modena; Germana Riddone; Hermann Schmickler
Chaired by: Dr. Schmickler, Hermann
General information
The medium term plan (MPP) and budget will be submitted today to the council for approval. Commitments done in 2012 will be transferred to the payment budget in 2013.
The efforts in finding space for CLIC have not been successful up to now. The installation of the X-band RF tests will be done in building 150 which already belongs to RF. There is no solution yet for the technology centre or for alignment and stabilization tests benches. Hermann will propose the construction of a new building in CLIC budget. A dedicated meeting will be organized for this.
Francesco Bertinelli inquired on the possibility to buy a new, larger CMM machine for metrology of the modules on this year budget. This was discussed after the CTC meeting.
Two-beam module program and ventilation in the test area. G. Riddone (see slides)
The plans for the year 2013 include engineering design work for the two beam module (new integrated disks, integration of mini-pumps ad cost and integration study) and for a new one-beam module depending on the future baseline. Hermann inquired about the design of the structure based on integrated disks. Germana replied that this was presented to the RF meeting and was a way to reduce the number of heating cycles and hence, reach the mechanical tolerances. Hermann and Roberto stressed that the engineering design needs to be followed by prototyping and RF testing. Three of these disks are already being manufactured for bonding and brazing tests. Manufacture of a prototype able to be tested in the two-beam module and Xbox2 will not be ready in 2013. Concerning the one-beam module, Hermann asked to wait for the project decision.
Prototyping and testing. Germana presented the plans for the modules being constructed. It was noticed that the module review in June 2013 will only be able to judge results of the single module thermo-mechanical tests as the second module will only be assembled during the summer. Hermann suggested delaying the review to the end of the year in order to have complete tests in a two module system. A smaller, internal review can be hold after the tests in the single module to learn and improve the second module manufacture.
Germana presented the HVAC system being finalised in RF-PM lab in building 169. The system will simulate tunnel conditions with a temperature from 20° to 40° C and an air speed of 0.2 to 0.8 m/s. Kurt Artoos commented on the temperature range. Indeed, this is the current specification in the CDR. However an interval of 10 to 30 degrees would be better for power consumption and to avoid condensation. Ahmed Cherif also commented that this range is on the limit of the reference temperature for the CMM (20° C). It was agreed that the interval was relevant and the tunnel conditions in the CDR may need re-discussion.
The cost of the full system was evaluated to 300kEuros. Hermann noticed in this respect that the budget estimates for all working packages need to be more accurate and that he will be also more rigorous with it.
Beam instrumentation plans. T. Lefevre
Thibaut went through the 26 slides presented in Anaheim on the status of the different beam instrumentation systems (see slides). The main achievements for this year was the construction of a new, cheaper strip-line monitor that will be installed in CTF3 by the beginning of 2013 for tests with beam and comparison with an inductive pick-up already available. The installation of a full test line n CTF3 was required. Apparently, the use of silicon carbide smears the required notch at 12GHz. Follow-up on this issue will be done in CTC (Action: Nuria)
Beam loss monitors. The BLM based on ionization chambers for LHC already meet the requirements of CLIC. A cheaper alternative using long optical fibres as Cherenkov detectors has been studied analytically. Beam and radiation hardness tests were also done.
Regarding the laser wire scanners Hermann asked if the flatness of the screen is an issue. Thibaut replied that not specifically for this but that this is an issue for the OTR systems.
On the diffraction radiation for beam size monitoring, beam tests are been performed in CESRTA. A second phase using shorter wavelength is under study using the storage ring. The budget requirement for 2013 will depend on the final decision on this phase.
Stabilisation WP status. K. Artoos
Kurt summarized the status on manpower and collaborations. Contributors from France (CEA, LAPP) are waiting for a decision on funding. New K contracts for sensors development and optical measurement methods can be drafted for project approval.
On the technical achievements, Hermann noted that there was enough material for three or four meetings where all concepts are explained. He suggested organizing a series of seminars of lectures on CLIC technology similar to what was done some time ago. This will include also tolerances on resolution, precision and accuracy and be independent from CTC. (Action: Hermann, Kurt)
Present: Kurt Artoos; Francesco Bertinelli; Nuria Catalan Lasheras; Ahmed Cherif; Roberto Corsini; Mick Draper; Cedric Garion; Andrea Jeremie; Thibaut Lefevre; Helene Mainaud Durand; Michele Modena; Germana Riddone; Hermann Schmickler
Chaired by: Dr. Schmickler, Hermann
General information
The medium term plan (MPP) and budget will be submitted today to the council for approval. Commitments done in 2012 will be transferred to the payment budget in 2013.
The efforts in finding space for CLIC have not been successful up to now. The installation of the X-band RF tests will be done in building 150 which already belongs to RF. There is no solution yet for the technology centre or for alignment and stabilization tests benches. Hermann will propose the construction of a new building in CLIC budget. A dedicated meeting will be organized for this.
Francesco Bertinelli inquired on the possibility to buy a new, larger CMM machine for metrology of the modules on this year budget. This was discussed after the CTC meeting.
Two-beam module program and ventilation in the test area. G. Riddone (see slides)
The plans for the year 2013 include engineering design work for the two beam module (new integrated disks, integration of mini-pumps ad cost and integration study) and for a new one-beam module depending on the future baseline. Hermann inquired about the design of the structure based on integrated disks. Germana replied that this was presented to the RF meeting and was a way to reduce the number of heating cycles and hence, reach the mechanical tolerances. Hermann and Roberto stressed that the engineering design needs to be followed by prototyping and RF testing. Three of these disks are already being manufactured for bonding and brazing tests. Manufacture of a prototype able to be tested in the two-beam module and Xbox2 will not be ready in 2013. Concerning the one-beam module, Hermann asked to wait for the project decision.
Prototyping and testing. Germana presented the plans for the modules being constructed. It was noticed that the module review in June 2013 will only be able to judge results of the single module thermo-mechanical tests as the second module will only be assembled during the summer. Hermann suggested delaying the review to the end of the year in order to have complete tests in a two module system. A smaller, internal review can be hold after the tests in the single module to learn and improve the second module manufacture.
Germana presented the HVAC system being finalised in RF-PM lab in building 169. The system will simulate tunnel conditions with a temperature from 20° to 40° C and an air speed of 0.2 to 0.8 m/s. Kurt Artoos commented on the temperature range. Indeed, this is the current specification in the CDR. However an interval of 10 to 30 degrees would be better for power consumption and to avoid condensation. Ahmed Cherif also commented that this range is on the limit of the reference temperature for the CMM (20° C). It was agreed that the interval was relevant and the tunnel conditions in the CDR may need re-discussion.
The cost of the full system was evaluated to 300kEuros. Hermann noticed in this respect that the budget estimates for all working packages need to be more accurate and that he will be also more rigorous with it.
Beam instrumentation plans. T. Lefevre
Thibaut went through the 26 slides presented in Anaheim on the status of the different beam instrumentation systems (see slides). The main achievements for this year was the construction of a new, cheaper strip-line monitor that will be installed in CTF3 by the beginning of 2013 for tests with beam and comparison with an inductive pick-up already available. The installation of a full test line n CTF3 was required. Apparently, the use of silicon carbide smears the required notch at 12GHz. Follow-up on this issue will be done in CTC (Action: Nuria)
Beam loss monitors. The BLM based on ionization chambers for LHC already meet the requirements of CLIC. A cheaper alternative using long optical fibres as Cherenkov detectors has been studied analytically. Beam and radiation hardness tests were also done.
Regarding the laser wire scanners Hermann asked if the flatness of the screen is an issue. Thibaut replied that not specifically for this but that this is an issue for the OTR systems.
On the diffraction radiation for beam size monitoring, beam tests are been performed in CESRTA. A second phase using shorter wavelength is under study using the storage ring. The budget requirement for 2013 will depend on the final decision on this phase.
Stabilisation WP status. K. Artoos
Kurt summarized the status on manpower and collaborations. Contributors from France (CEA, LAPP) are waiting for a decision on funding. New K contracts for sensors development and optical measurement methods can be drafted for project approval.
On the technical achievements, Hermann noted that there was enough material for three or four meetings where all concepts are explained. He suggested organizing a series of seminars of lectures on CLIC technology similar to what was done some time ago. This will include also tolerances on resolution, precision and accuracy and be independent from CTC. (Action: Hermann, Kurt)
Next meeting will take place on 15th January.
Reported by N. Catalan Lasheras
Reported by N. Catalan Lasheras
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