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)
LAV construction status – M. Moulson (Frascati) – Photon Veto WG – Mainz – 6 September 2011
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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
LAV construction status – M. Moulson (Frascati) – Photon Veto WG – Mainz – 6 September 2011
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New drawings on EDMS
A1: Drawing as-built*
A6-8: Final drawing for construction
A2-5: Drawing as-built*
A9-A11: Preliminary
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.
LAV construction status – M. Moulson (Frascati) – Photon Veto WG – Mainz – 6 September 2011
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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
2012
A8-A11 construction
A12 drawing
Installation and commissioning of A1-A11 (A1-A5 will participate to the run)
LAV construction status – M. Moulson (Frascati) – Photon Veto WG – Mainz – 6 September 2011
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Status of the LAV FEE
electronics
M. Raggi LNF
G. Corradi, C. Paglia, D. Tagnani
LNF SELF
PVWG WG
Mainz 6/09/2011
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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.
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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
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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
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A2 Test beam: objectives
1. Validate final version of front-end electronics
plus modifications of voltage divider:
a) Time-over-threshold vs. charge calibration curves
b) Efficiency vs. threshold for electrons, hadrons and muons
2. Measure time and energy resolution
3. 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
Total charge with ToT vs.
QDC
ToT(ns)
Q(pC)
Very basic parametrization with 4th order polynomial of charge vs. ToT curve
considering all the hit blocks together
Energy resolution and
linearity
2 beam Cerenkov counters (TDC &
QDC):Operated at two different
pressures to select electrons in a
given momentum range:
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
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
6.4
G = 1.1 ×106
• 1st dynode collection eff.
e1 = 0.85
4.8
• Intra-dynode collection eff.
ed = 0.98
3.2
• 1st dynode time fluctuations
dT1 = 0.5 ns
• Intra-dynode time
fluctuations
dTd = 0.8 ns
4
3
2
1.6
Large Angle Veto WG meeting – Mainz – 6/9/2011
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Time (ns)
2
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
Time over threshold (ns)
Large Angle Veto WG meeting – Mainz – 6/9/2011
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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
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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
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