LHCb Calorimeter upgrade TDR News Spares LHCb Calorimeter upgrade meeting Frédéric Machefert Laboratoire de l'Accélérateur Linéaire, Orsay

Outcome of the electronics review The outcome of the review is very positive No major problem with the foreseen implementation Thank you to All those who contributed to the review To the referees We have to think about the response of the group to the report Should be discussed today during the analog / digital sessions The document written will help us to write the electronics parts of the TDR to come But the format is not the same → some reshuffling is necessary

Agenda – Meeting of Sept 20th, 2013

Preparation of the Technical Design Report Introduction (1 page) (Frederic) Electronics Analog part (4 pages) (Barcelona) Digital part (2 pages for the FE and 2 pages for the control board) (Frederic+Christophe+Olivier) LLT (1 page) (Patrick) DAQ (TELL40...) (1 page) (Orsay) Auxiliary systems (HV, calibration, ...) (2 pages) (Yuri) Aging/radiation effects on the modules (3 pages, Yuri) including a section on the replacement of the modules during LS3 (Mechanics, Marie-Noëlle) (1 page) Performances Pile-up (2 pages) (Alexis) Particle identification without SPD/PRS (2 pages) (Dmitri) Installation, commissioning , responsibilities, organization, schedule, costs... Conclusions

Preparation of the Technical Design Report First Initial Draft of each section Latest Corrections First Draft 2nd Draft TB LHCC Circulation Circulation Oct, 11th Oct, 18th Oct, 25th Nov, 2nd Nov, 12th Nov, 26th The document can be accessed through svn (LHCbDocs) at And information on LHCbDocs can be found at : //svn.cern.ch/reps/lhcbdocs/Users/frederic/TDR_Sept2013/latest https://twiki.cern.ch/twiki/bin/view/LHCb/LHCbDocs

MC simulations SPD/PRS removal does not work in GAUSS and BRUNEL Some xml files concerning the SPD/PRS are required Plan is to keep them in the next release of GAUSS temporarily No arm, the files are useless But unfortunately, the software needs the files to be there The second problem is more annoying Brunel needs to access some containers for electron reconstruction The corresponding algorithms need some PRS/SPD information Hard coded in the software Brunel crashes abruptly Olivier works on this in order to be able to configure correctly the algorithms. We have 3 large samples which have been produced by Paul No SPD/PRS A simple trick → Brunel does not crash anymore But, electrons are not reconstructed 3 completed productions : event type 13102201 ( Bs_phigamma=DecProdCut ) Nu= 3.8, 7.6, 11.4 - ~100k events per sample.

Spares We plan to re-use a fraction of the present system The problem of the spares is more severe than for any new system Systems made by external companies PMT Power supplies (aging, cumulated radiation effects) Fan Systems made by the LHCb groups Do we have any tension on the boards that we want to keep HV, calibration system Plan to use PRS/SPD power supplies as spares We have ~300 PMT spares → some may be used by 2015 Contact taken with Hamamatsu It seems that the reference we used (R7899-20) is still available Question on some ambiguity on the type of window Price of a series of PMT Wait for the answer from Hamamatsu