Slide 1

CALICE Referees Review

Andy White, Junji HabaDESY PRC 71April 2011

Very good overview from PRC68CALICE is a large, worldwide collaboration working on many aspects of PFA-based calorimetry with fine sampling /granularity for a future linear colliderImpressive test beam program for several yearsCALICE gives a precise picture inside Shower (antomy)Publications starting to appearimportant for proposals, future support, Good progress

CALICE overview contdNew dimension added: potential calorimetry for CLIC ECALs : Si-W, Sc-W, DECALHCALs: AHCAL, RPC-DHCAL, GEM-DHCAL, GRPC-SDHCAL, Micromegas-SDHCAL and WHCAL for higher energyJET (T3B)

CALICE is still a great horizontal collaboration, but with strong involvement from vertical detector concepts:The major part of the effort is focused towards presenting realistic proposals for the detector concept reports of the ILC technological design phase 1, which is due in 2012. with a few established options. Some other options are yet to be examined in the form of physics prototype

Ultimate goal of the collaboration:Validation of PFA Beam test is the keyTo validate/improve the performance.To make 3D anatomy of electromagnetic/hadronic shower with super fine grain sampling calorimeters to get a complete understanding of showers.List of Past campaign

Si-W ECAL

Hadron response for simulations in W

Si-W ECALValuable input for Model improvements

AHCAL

Software compensation works!AHCALAHCALLinearit 1%HadronsMC simulations of longitudinal profiles

Saturation of photon sensors under controlPositron response of AHCAL, non linearity due to PPD can be recovered reasonably well.Digital calorimeter works fine.

Blue Full containedDHCALCombined beam test possible only in CALICE

SiECAL+DHCAL

Tungsten HCAL for higher jet energy

W-AHCAL=AHCAL+W

First Impression Dynamic anatomy of shower:Timing structure of shower evolutions

Toward validation of PFA algorithmVery important step, further study should be extremely useful.PFAPersonal proposal (JH) for a thorough extension of the embedding method.Experimental validation of PFA is one of the ultimate goal of CALICE which is yet to be achieved. The vast sample of calorimeter response taken in the CALICE beam test can be a powerful shower library. One can construct virtual calorimeter response of Jet with the shower library in the computer by an embedding method without any shower simulations. PFA algorithm would demonstrate its ability with the above fully embedded virtual Jet sample. May need more beam test sample for /K/pi/p down to low energy (cut off momentum).Technological prototyping in progress

New approach SDCALTwo technologies considered: GasRPC, Micromegas: GRPC

Semi-digital HCAL

Comments and RecommendationsThe PRC congratulates CALICE on its very impressive and successful test beam campaigns and supports their continuation with the remaining physics prototypes, and technical prototypes as realistic components of future ILC detectors. The calorimeter technologies developed and investigated are also extremely valuable for any future experiments. The beam test outcome is also very useful for future improvement of our understanding of shower development, which should be essential for any future (and also ongoing like LHCs ) experiments.

The PRC recommends that DESY continue support for: - Necessary modifications to test beam fixtures - Test beam campaigns at CERN and Fermilab - Continuation of electronics integration development - Mechanical and electrical engineering - Provision of computing resources

NotesThe PRC take note that the challenges for adequate test beam time and the funding necessary to carry out the proposed program.While at FNAL sufficient time could have been allocated in 2011, the request for CERN was, despite a good preparation and a favourable evaluation by the CERN SPS committee, severely downscaled.

SuggestionThe effort to improve the shower model is very important and would be done in a systematic and strategic way. We like to encourage it further. It is nice to have the report on the status and future plan for the collaboration with the simulation research activities in future meeting.