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CALICE Referees’ Review
Andy White, Junji Haba
DESY – PRC 71
April 2011
Very good overview from PRC68
 CALICE is a large, worldwide collaboration working on
many aspects of PFA-based calorimetry with fine
sampling /granularity for a future linear collider
 Impressive test beam program for several years
 CALICE gives a precise picture inside Shower (antomy)
 Publications starting to appear…important for proposals,
future support,…
Good progress
CALICE overview cont’d
 New dimension added: potential calorimetry for CLIC
ECAL’s : Si-W, Sc-W, DECAL
HCAL’s: AHCAL, RPC-DHCAL, GEM-DHCAL, GRPCSDHCAL, 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 key
 To 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
Si-W ECAL
Hadron response for simulations in W
Valuable input
for Model
improvements
AHCAL
AHCAL
Software compensation works!
Saturation of photon sensors under
control
AHCAL
 Positron response of AHCAL, non linearity due to PPD can
be recovered reasonably well.
Linearit ≤ 1%
Hadrons
MC simulations of longitudinal profiles
DHCAL
Digital calorimeter works fine.
Blue
Full contained
Combined beam test
possible only in CALICE
SiECAL+DHCAL
W-AHCAL=AHCAL+W
Tungsten HCAL for higher jet energy
“First Impression”
Dynamic anatomy of shower:
Timing structure of shower evolutions
 PFA
Toward validation of PFA algorithm
 Very important step, further study should be extremely
useful.
Personal 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 SDCAL
Two technologies considered: GasRPC, Micromegas:
GRPC
Semi-digital HCAL
Comments and Recommendations
 The 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 LHC’s ) 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
Notes
 The 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.
Suggestion
 The 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.