ILC Detector R

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ILC Detector RD at BNL

• BNL-FNAL Meeting, Nov. 14, 2005
• Veljko Radeka
• For an overview of ILC detector requirements and
  design issues see Jim Braus seminar at BNL , Oct
  2005
• https//www.inst.bnl.gov/seminars/PDF/10122005.pdf
  

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RD at BNL for ILCI. Detectors

• Monolithic Active Pixel Sensors (MAPS) for
  Vertex Detection.
• This is based on direct collection of
  charge produced by an ionizing particle within
  the sensitive layer of a CMOS readout circuit.
  The result is a low mass (0.1 of radiation
  length of Si) detector layer with a position
  resolution of a few microns.
• Fine granularity small TPCs.
• These TPCs will be based on GEMs (Gas
  Electron Multipliers) at the ends of the drift
  region followed with fine granularity
  interpolating readout electrodes and extensive
  use of monolithic circuits designed for low noise
  TPC waveform recording.
• EM calorimetry based on tungsten absorbers and
  silicon sampling layers (in collaboration with
  SLAC).
• Fine granularity calorimetry with
  small cells ( 5 mm) can only be realized with in
  situ readout at the sampling layers. This
  requires specially designed monolithic circuits
  and presents interconnection topology challenges.
• End cap calorimetry.
• Unique challenges in forward
  direction. This has not been addressed in depth
  so far.

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Original MAPS (Deptuch,Turcheta, et al.)
A new concept - and challenge introduce a drift
field into standard CMOS (Rehak, Deptuch, et al.)

• View of a pixel
• Green are n-wells for anode and
• p-channel transistors
• Red are p-wells fo n-channel transistors

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TPC Critical Technologies

• GEM vs MWPC
• Anode pad configuration - chevron
• Anode pad ASIC board topology and fabrication
• ASIC DD
• Field cage fabrication and asembly

HV Connection
HV Cathode Plane
Field cage
Double GEM planes
Digital readout board
Interpolating anode pad plane with front end ASICs
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Anode Pad Plane Asic Board A major topology
and fabrication challenge (solved)
0.010
0.004
Blind Vias!
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TPC pad readout plane ASIC side
7300 2x5 mm2 pads
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TPC for LEGS Experiment
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• Novel prototype detectors
• 2d stripixel detectors, planar 1-sided
  process
• US-ATLAS Upgrade (radiation hard up to
• 
  1015 neq/cm2)
• Combination of 3 new aspects
• 2d stripixel structure with short strips (3 cm)
• P-type substrate (no inversion, higher CCE than
  n-type after radiation)
• Magnetic Czochralski-Si (MCZ-Si) for added
  radiation hardness
• 1st batch of prototypes completed at BNL

50 ?m

• US-ATLAS Upgrade
• Pixel pitch 620 ?m (X) and 50 ?m (Y)
• Strip pitch 50 ?m (U) and 50 ?m (X)
• Stereo angle between u and Y strips 4.6 º
• MCZ p-type, detector thickness 200-300 ?m

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Si Detector Development and Processing in
Instrumentation Div.

• Novel 2d Stripixel detectors
• 2d position sensing, 1-sided processing
• NASA heavy ion microbeam project (2d-submicron
  position resolution obtained in laser and ion
  beam tests at BNL)
• PHENIX Upgrade
• 25 ?m position resolution in x and y obtained in
  beam teats on BNL-made prototypes)
• Technology transferred to industry both SINTEF
  and Hamamatsu had pre-production test runs
• Hamamatsu also produced prototypes with side
  readout

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RD at BNL for ILCII. Accelerator Technology

• Photocathode development for polarized electron
  beams
• 1.1 Development and testing of a low
  emittance ellipsoid beam using suitably
  designed laser beam
• 1.2 Development of a long lived
  photocathode and characterization of the
  polarized electrons
• 1.3 Integration of laser, cathode
  injector and magnet system to produce and
  characterize the electron beam for the ILC
• - generation of flat beam
• - generation of low emittance
• - production of polarized beam of
  required charge, bunch structure and life time.
  
• 2. Electron beam profile and bunch length
  diagnostics.
• Physics Dept., CAD and Instrumentation
  Division have been working on using electro
  optic technique to measure the bunch length of
  relativistic electron beams with sub ps time
  resolution, which is essential for
  characterization of ellipsoidal beams.