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CLIC Technical Committee - Meeting #67
CLIC Technical Committee - Meeting #67 (15 Jan 2013)
Present: Kurt Artoos; Mike Barnes; Nuria Catalan Lasheras; Roberto Corsini; Mick Draper; Andrea Jeremie; Thibaut Lefevre; Helene Mainaud Durand; Michele Modena; Hermann Schmickler
Chaired by: Dr. Schmickler, Hermann
General information
In the context of Hi-Lumi LHC, Herman is organizing a workshop for remote handling that will take place in March/April. This will be of interest also for some of the CLIC activities as alignment. People interested on assisting to the workshop or in contributing with a presentation should inform Hermann by mail.
The CERN council approved next year budget based on the presented MPT. For CLIC, the funding level is the same as last year, plus money committed on 2013 has been left inside 2013 budget. However, there are still discussions on the percentage of each budget that will be retained by the DG for contingency. A proposal will be discussed this week. Budget discussions can take place later but everybody is requested to send a mail to Herman with the expected budget needs for 2013. Herman, discouraged excessive safety margins and warned that under spending systematically at the end of the year might be harmful for next year budget.
After a meeting with Francesco Bertinelli and Roberto Saban, it was decided to have a look at the possibility to use building 156 for installing the CLIC technology centre. Nuria will contact Rolf Lindner to arrange a meeting on site.
CLIC survey and alignment status and plans. H. Mainaud.
Helene presented this year’s achievements on the four tasks inside the survey and alignment working package (see slides). Answering a question from Hermann, Helene explained that an absolute measurement would give you the position of the sensor with respect to a coordinate system given as an example by the stretched wire. This is of course dependent of temperature and is referred to 20 degrees. The change of sensors reading with temperature, and its consequences have to be assessed from the TBTM tests.
The tunnel metrology tests are facing problems of humidity in TT1. After two years the use of TZ32 has been authorized by LMC and safety. Changes of the access system will be financed by CLIC and the access team equally.
A major problem is the lack of resources during the LS1. Aside from Helene who could dedicate 30% of her time to CLIC activities, no other staff member in her team is available for CLIC. Only students and fellows will work on CLIC tasks. The possibility of having more students from the PACMAN network proposal will be confirmed in March. But this will also require more of Helene's time for the network management and students supervision.
CLIC DB klystron modulators R&D Status and Plans. D. Aguglia
Davide presented the current specifications for the pulse to be delivered by the modulator. The request of a repeatability of 10ppm is very challenging and could be relaxed to 100ppm if the phase compensation solution using a kicker is proven to work. The universities of ETH Zurich, LAVAL and Nottingham are working together with CERN to deliver a working prototype modulator and pieces to assemble a second one by 2016. The main task of CERN is to perform statistical studies of repeatability and reliability of modulator components. This will allow feedback to the other partners on the satisfactory solutions.
Hermann reminded that a missing piece of information is the measurement of transfer function between the klystron voltage pulse and the final power ripple. Measuring properly this is not straightforward. Davide will present in three months to CTC the possibilities for measuring this both in CTF3 and DESY.
A considerable effort is being out on to ensuring the stability of the electrical network without bulky filters. It was noted however that the requirements from EDF are not yet known.
The technical presentation of the modulator R&D is a good candidate for a Friday CLIC seminar.
Next meeting will take place on February the 5th. The proposed agenda includes status reports from Mike and Michele.
Reported by N. Catalan Lasheras
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