News from CALICE

1
News from CALICE

• Paul Dauncey
• Imperial College London

2
CALICE continues to grow

• CALICE currently 138 physicists, 24 institutes, 8
  countries
• Four new institutes have joined since the summer
• Seoul digital HCAL front end electronics
• U. Texas Arlington GEMs for the digital HCAL
• NICADD (N. Illinois) scintillating tiles for the
  digital HCAL
• Dubna (two groups) RPCs for the digital HCAL
• There are potentially four new groups in addition
• Boston, Chicago, Illinois already informally
  working with Argonne on RPCs for the digital HCAL
• FNAL new approach, possibly also RPCs for the
  digital HCAL
• AFAIK, outside Asia, this leaves few non-CALICE
  groups
• Europe only Italian LCCAL (sci tile ECAL)
• US SLAC/Oregon (Si-W ECAL), Caltech (PbWO4
  crystals)

3
CALICE scope increasing too

• New collaborators allow the project to expand
• Silicon-tungsten still only ECAL option
• Although there is pressure to merge with the
  Italian LCCAL scintillating tile/silicon ECAL
  group
• Scintillating tiles still only analogue HCAL
  option
• Regarded (externally, e.g. by DESY PRC) as
  baseline HCAL option
• Fine-grained HCAL with digital readout now
  several options
• RPCs large US and Russian effort
• Small scintillating tiles only NICADD
• GEMs only UTA
• Unfortunately, not all on the same schedule
• New options starting from scratch further behind
• But desirable (and politicially necessary) to
  beam test all options
• The schedule has changed we need to handle this
  carefully

4
ECAL progress
Silicon wafer production (Prague, Russia) 29
good wafers (out of 30) so far 270 needed. Very
front end chip (Orsay) with 18 channels, CR-RC
shaper and multiplexer. Prototype back from
fabrication Sept currently under test. PCB to
hold chips and silicon wafers under design,
production in 2003.
Tungsten plates (Russia) have thickness and
density within tolerance. First carbon fibre
mechanical structure (France) and insert carbon
fibre structure show good mechanical behaviour.
ECAL still on schedule for early 2004
5
Analogue HCAL progress
Detailed study done of many combinations of
scintillating tiles, wavelength-shifting fibres,
mechanical coupling and photodetectors (DESY,
Prague, Russia)

• Example of tile-fibre geometry dependence varies
  from 9 to 25 p.e./MIP

Analogue HCAL ready by mid 2004
6
Digital HCAL RPCs, GEMs, SciTiles
RPCs glass resistive plates, anode pads outside
gas gap
SciTiles hexagonal tiles, spray-painted white
with WLS fibres
GEMs foil with 75mm holes above 1?1 cm2 pads
RPCs ready by mid 2004, SciTiles by end 2004,
GEMs by early 2005 (a few layers only)
7
HCAL readout electronics

• Analogue option
• Front end electronics three ASICs being
  considered
• One is Orsay VFE chip as used for ECAL (with
  minor modifications)
• Back-end electronics no bid within collaboration
  yet
• Use of UK back end electronics still being
  discussed
• Choice of Orsay VFE chip would make this
  straightforward
• Other options might not work with UK readout
  boards
• Digital options
• Front end electronics under development
  (France/Korea)
• Simple Q-V conditioner circuit feeding FPGA
  directly
• Could be used for any/all options (if pedestals
  and gains are uniform)
• Back-end electronics again, no bid yet
• Reuse UK readout boards? Bypass ADCs so act as
  LVDS-VME interface
• Leads to common DAQ system

8
Beam test status

• Beam test schedule is changed due to HCAL
  schedule
• Our proposal said 6 months from Apr to Sep 2004
• Now, analogue and RPC options only available by
  mid 2004
• SciTile and GEM options need to be tested in 2005
• Schedule is now 1 year, from mid 2004 to mid 2005
• Not necessarily continuous, not necessarily at
  one site
• Still no site decision!
• CERN now less likely, given schedule change
• FNAL setting up new beamlines in 2003 (if effort
  available)
• Favoured option if available (especially if FNAL
  become collaborators)
• Russians pressing hard for Protvino
• They have said they will cover cost of beamline
  setup
• But there are safety concerns

9
Implications for the UK

• How do we change our schedule? Several pressures
• ECAL aims to still be ready by early 2004
• Need to be able to read it out on bench to check
  OK
• May even go for ECAL-only beam test at DESY
• Delay in approval has meant no RAL ID effort
• Electronics original schedule had completion by
  Dec 2003
• Probably too tight now need several extra months
• PPRP will need explanation about schedule
• If we slip, we have to explain why it is OK,
  given previous stance
• We will also need to request funding for FY05/06
• My proposal for this
• Delay electronics schedule by three months to Mar
  2004
• Expand into FY05/06 as exploitation only
• Think of some way to convince PPRP this is not a
  big deal