Work Package "Fibre Procurement and Quality Assurance" Status , plans and issues

1. Work Package "Fibre Procurement and Quality Assurance" Status, plans and issues Aachen, CERN, Dortmund, Heidelberg, Russia Diam. scan Att. Length Scint. LY Irrad studies New QA machine, with great support by AC Simulations, Diam. scan other basic studies Irrad studies New QA machine, à la AC Activities Christian Joram CERN PH/DT 20 August 2014

2. Current assumption: • All (~10 000 km) SciFi fibres are centrally purchased, tested and distributed to (~3-5) mat winding sites. • Considered suppliers • Kuraray (JP) • Saint Gobain (FR/US) • ELJEN technology (US) • It appears that only Kuraray SCSF-78-MJ (Ø 0.25 mm) is close enough to our desired specifications (LHCb-PUB-2014-019 summarises our prel. specs.) • However, also for the SCSF-78MJ fibre, there are still issues which affect hit precision, detection efficiency and production yield: • Uniformity of fibre diameter, minimisation of bump frequency (bump = diam. > 275 mm) • Attenuation length • Scintillation Light Yield • Radiation damage (at low dose, <1 kGy). Tests being prepared at HD, CERN and DO. Talk by Cesare Alfieri Christian Joram CERN PH/DT 15 September 2014

3. TDR performance numbers are based on 'old' fibres purchased in 2010/2011 (AC, DO, ?). • 100 km fibres purchased in Nov 2013, Lots 13112101-08 • Lower than expected att. length (~3m instead of ~4 m). • Higher than expected bump size and frequency. Ø up to 1.3 mm. Frequency >1 bump/km. Discovered that Kuraray test missed many bumps. • 50 km fibres received in Aug 2014, Lots 14080801-06 • Even lower att. length (~2.6 m) • Still high bump size and bump frequency (f ~2/km) acc. to Kuraray • Scint. LY  see Cesare's talk • Further 100 km are on order, but the precise specifications and delivery dates will only be fixed after full analysis of Aug 2014 batch. • We also received some samples (~km length) of SCSF-78 fibres with different WLS concentrations  see Cesare's talk • You find an ~up-to-date inventory of all SciFi fibres at https://twiki.cern.ch/twiki/bin/view/LHCb/FiberInventory Christian Joram CERN PH/DT 15 September 2014

4. Spectral shifter Е L activator (α, βorγ- radiation) L= 1 - 2 nm << R Patent RU 2380726 (2010) For the time being only a side line: Nanostructured Organosiliconluminophores (NOLs) (Institute of Synthetic Polymeric Materials, S. Ponomarenko) Chemical coupling of activator and WLS molecules increases scintillation yield. Light output is 90-120% of that of anthracene , i.e. 50% higher than in standard plastic scintillator (like BC-408) • Kuraray and ISPM are about to sign a NDA which will allow Kuraray to buy some of this material and process it to fibres for test. We will act as performance evaluators. • Hope to get first fibres still before the end of the year. Christian Joram CERN PH/DT 15 September 2014

5. Visit to Kuraray fibre factory in Niigata on 6 Oct 2014 (C. Joram, T. Nakada, A. Schopper, U. Uwer) Agenda to be defined, but obvious points are - SciFi minimum specs and wish list - discussion of current quality and development plan - commercial scenario for large scale order (cost, delivery plan) - quality assurance, quality categories - communication, documentation We will be able to visit the production facility. Christian Joram CERN PH/DT 15 September 2014

6. Building a new fibre QA machine for CERN tensioner Cleaning (missing) Node detector LASER micrometer feeder Cladding Test (missing) Francois Garnier, P-A Guidici H. Esser In parallel to mechanical work at CERN, Aachen prepares all electrical equipment (motors, controllers, cladding test, …). Set-up may go to AC end of September for el. installation and commissioning. Machine will be installed in a semi-clean lab at CERN (B 108). First measurements still in 2014. Christian Joram CERN PH/DT 15 September 2014