LAV construction: Status and overview

1. LAV construction:Status and overview A.Antonelli 12 Settembre 2011 Referee INFN

2. LAV construction status: a snapshot • A1-A5 at CERN, ready for installation, the sliding feet drawing has been finalized. The spare feet is going to be modified in LNF workshop and tested at CERN beginning of October. Vacuum test foreseen in November • A3 repairs carried out week of 22-25 August, no major problem in the work. WARNING the ECN3 crane problems should be fixed • A6 under construction at Frascati • New, smaller banana design • 240 ch = 60 bananas total • 12 installed • 12 ready to install • 18 need cabling and test • 18 to build (=72 blocks to process)

3. Status of A7,A8,A11 • A7:Basic construction finished, will be delivered 10/10/2011 • A8: First pass with lathe completed, will be delivered 10/11/2011 • A11: cutting (done), beveling, will be delivered 10/12/2011

4. New drawings on EDMS A1: Drawing as-built* A2-5: Drawing as-built* A9-A11: Preliminary A6-8: Final drawing for construction WARNING: LAV-Straw interface should be fixed ASAP, I remind you that A11 is under construction, A9-A10 bid will be done in September. We need coordination among the engineers.

5. 2011 Final A3 repairs went smoothly in August 5 stations essentially ready to install (A1, A2, A3, A4, A5) Minor work on flanges for A1, A4 to be done before installation A6 being assembled now First layer installed in before August shutdown On track for delivery of A7 and A8 by end of year A9-A10 Bid in September A8-A11 construction A12 drawing Installation and commissioning of A1-A11 (A1-A5 will participate to the run) 2012

6. Status of the LAV FEE electronics M. Raggi LNF G. Corradi, C. Paglia, D. Tagnani LNF SELF PVWG WGMainz 6/09/2011

7. 9U cards production • PCB for 5 boards already produced and mounted and tested • 100 ToT mezzanine already produced mounted and tested • Sum 4 analog signals, 50 pieces produced and mounted Few of them tested Assemble a first full 9U FEE prototype before the end of October.

8. TELL1 setup • A Tell1 already @ LNF • A NA62-LAV VME crate already @ LNF • Plan to startup the system during October together with the LAV FEE • New Post Doc at LNF mainly dedicated to this

9. Future plans • Assemble a first full 9U FEE prototype before the end of October. • Test the system extensively during fall • Validate the FEE before the end of 2011 • Start a first production before the end of 2011

10. A2 Test beam: objectives • Validate final version of front-end electronics plus modifications of voltage divider: • Time-over-threshold vs. charge calibration curves • Efficiency vs. threshold for electrons, hadrons and muons • Measure time and energy resolution • Test new FEE with TELL1 readout • All that on a full, final ANTI ring, and thus also checking: • construction techniques • cabling and connectors • new DB37 signal flanges • new ground feed-through on HV flange T9 beam Electrons 0,5 – 5 GeV selected using cherenkov Muon run 8 GeV

11. Total charge with ToT vs. QDC ToT(ns) Q(pC) Very basic parametrization with 4th order polynomialof charge vs. ToT curve considering all the hit blocks together

12. Energy resolution and linearity 2 beam Cerenkov counters (TDC & QDC):Operated at two different pressures to select electrons in a given momentum range:

13. Time resolution Electrons, first hit block. Time slewing fit and corrected Time resolution after time slewing correction Respect to the trigger time Diff. of 2 subsequent blocks

14. MC Digi for Large Angle Vetoes • Detailed PMT simulation needed to assess efficiency @ low-energy • Include and correctly treat: • Gain fluctuations • Optical g’s path fluctuations • Signal generation • Time over threshold FEE Signal (mV) N photo electrons 8.0 • MC input parameters: • Gain at operation point • G = 1.1 ×106 • 1st dynode collection eff. • e1 = 0.85 • Intra-dynode collection eff. • ed = 0.98 • 1st dynode time fluctuations dT1 = 0.5 ns • Intra-dynode time fluctuations • dTd = 0.8 ns 6.4 4 4.8 3 3.2 2 1.6 1 Time (ns) Large Angle Veto WG meeting – Mainz – 6/9/2011 2

15. Present data/MC agreement For MC use: 157 pF PMT capacitance newly measured, take into account the 33 Ohm resistor at PMT out, 9.5 mV threshold, 2 mV hysteresis Data/MC agreement: now much more satisfying need to measure the threshold to improve MC Data Integrated charge (pC) Time over threshold (ns) Large Angle Veto WG meeting – Mainz – 6/9/2011 13

16. Conclusions We are on schedule (some months delay) Need to keep the effort in construction for the next year, the ANTI now are bigger 240 blocks 2012 will be crucial .. Many things in parallel construction, installation and commissioning, run. In parallel FEE production and test should go on and the integration with the tell62 should proceed, all this with limited number of person Large Angle Veto WG meeting – Mainz – 6/9/2011 13

17. Richieste LNF INTERNO Riunioni di collaborazione, contatti con ditte per la meccanica e il FEE dei LAV, controlli di qualita' e misure (campo magnetico e vuoto) presso la ditte costruttrici Vessel, taglio laser del Tykec a INFN-GE= 9mu   18.00 ESTERO   . Riunioni tecniche progettisti con responsabilita' sulla meccanica, installazione ed elettronica= 2 mu 8.00 . run prova TDAQ, DRY run 2mu 16.00   3. installazione meccanica e test da vuoto 5 LAV al CERN, Installazione e test elettronica di 9 LAV=10mu 40.00 Riunioni di collaborazione e conferenze, responsabilita' Veti, 6.5mu 26.00 Run 4mu (8 settimane per due persone) 16.00 CONSUMO   Metabolismo, materiale magazzino e pool elettronica LNF e CERN per la costruzione,il cablaggio, il test elettrico e da vuoto di 4 LAV (diemetro >= 3m) , materiale vario da ditte per piccoli tools di costruzione, estensione materassino ammortizzante, coibentazione per temperatura 40.00 TRASPORTI   Trasporto di 4 LAV al cern (4 trasporti saranno eccezionali diametro maggiore di 3 metri). 20.00     APPARATI   Completamento elettronica di front end e del sistema di calibrazione,meccanica di A12 100.00 Totale NA62 Lab. Naz. di Frascati 284.00 Large Angle Veto WG meeting – Mainz – 6/9/2011 13