TPC Large Prototype panels D. Attié, P. Colas, E. Delagnes, M. Dixit, A. Giganon, M. Riallot, F. Senée, S. Turnbull Status of the Micromegas Large Prototype.

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Presentation transcript:

TPC Large Prototype panels D. Attié, P. Colas, E. Delagnes, M. Dixit, A. Giganon, M. Riallot, F. Senée, S. Turnbull Status of the Micromegas Large Prototype panels Studies on resistive coatings Installation in DESY

Phone meeting - Sep. 24, 2008 P. Colas - Large Prototype panels2 The panels PCBs have been produced 4 with the Saclay routing in 6 layers (delivered early June) 4 with the CERN routing with 4 layers (August)

Phone meeting - Sep. 24, 2008 P. Colas - Large Prototype panels3 A first ‘bulk Micromegas’ panel (without resititve foil) has been produced at CERN (Rui de Oliveira)

Phone meeting - Sep. 24, 2008 P. Colas - Large Prototype panels4 Mechanical support of the electronics All the components have been received and mounted (flat cables, shielding, Faraday cage, gasbox…)

Phone meeting - Sep. 24, 2008 P. Colas - Large Prototype panels5

Phone meeting - Sep. 24, 2008 P. Colas - Large Prototype panels6 Test setup operational Tests in gas have started (one faulty pad had to be disconnected)

Phone meeting - Sep. 24, 2008 P. Colas - Large Prototype panels7

Phone meeting - Sep. 24, 2008 P. Colas - Large Prototype panels8 Pedestals with all channels connected to the detector = 5.6 ADC /4096

Phone meeting - Sep. 24, 2008 P. Colas - Large Prototype panels9 Several techniques are being tested for the resistive coating 1)Carbon-loaded kapton. An old technique first tested in Carleton, using a Dupont film 1 MOhm/sq. Improvements on application of the resistive foil and switch to bulk. First results promising. Production of a panel started.

Phone meeting - Sep. 24, 2008 P. Colas - Large Prototype panels10 2) Prepreg+ screen printing This has been tried at CERN. 2 prototypes of 10x10 cm (2 and 8 MOhm/sq) have been tried at Saclay. There is not clear evidence that they are spark protected. Even one of the detector has been damaged by the HV during the test. Still such a layer will be applied to a CERN panel.

Phone meeting - Sep. 24, 2008 P. Colas - Large Prototype panels11 Plasma deposition of thin layers (Neuchatel, used for SiProt) Preliminary tests going on. Next step: cover a PCB and make a bulk out of it

Phone meeting - Sep. 24, 2008 P. Colas - Large Prototype panels12 Schedule The tests in gas wil continue this week. Travel to DESY on September 29 -Upgrade of the thermics for the MPPC trigger -Installation and tests in situ. Cosmics Then take beam data in the magnet in the period of weeks (+1?) depending on the field cage status.