Transcript US-Belle-II-Technical-Elements

US Belle II Project – Technical Elements
David Asner
Pacific Northwest National Laboratory
US Belle II project scope:
delivering key systems to KEK
iTOP (WBS 1.02,
readout WBS 1.03)
KLM (WBS 1.04,
readout WBS 1.03)
US Belle II Project
Commissioning
Detector (WBS 1.05)
Readout Systems (WBS 1.03)
to record signals from WBS
1.02 and 1.04 components
19-20 March 2014
US Belle II Independent Project Review
1.01 Project
Integration and
Support
1.02 iTOP Optics
1.03 Readout
Systems
1.04 KLM Systems
1.05
Commissioning
Detectors
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WBS 1.02: iTOP Optics
Level 2 Manager: Jim Fast
WBS 1.02: iTOP Optics
• Specifications, procurement, and acceptance test
iTOP quartz optics
• Beam tests, cosmic ray tests, and simulations to
validate iTOP counter performance
• Development of software tools for analysis of iTOP
counter data
19-20 March 2014
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Material Selection
• Corning 7980 fused quartz silica
– Selected prior to CD-1 as material
for all iTOP optical components
– Material developed for the
National Ignition Facility (NIF)
program
– Readily available and economical
material meeting specifications
P a r a m et er
M a t er ia l:
grade
inclusion class
homogeneit y
radiat ion hardness
st raia
bifringence
19-20 March 2014
B a r d im en sion s:
US Belle II Independent Project Reviewlengt h
widt h
N om in a l va lu e
Corning 7980
0
< F (< 5 ppm)
> 1 MRad
1 × 1012 n/ cm 2
ISO 10110-4
(5/ t hickness dir.)
≤ 1 nm/ cm
125 ± 0.05 cm5
45.0 ± 0.015 cm
Optical Components
All optical components produced from Corning 7980 Fused Quartz Silica
Bar/mirror width
450 mm
Spherical Mirror
Quartz bars (2)
Expansion prism (wedge)
Prism length
100 mm
MCP-PMTs
Length 2600 mm
2x1250mm+100mm
Thickness 20mm
Prism width 456 mm
MCPPMT width 444 mm
19-20 March 2014
Prism height 51mm
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Science Driven Specifications
determined with Monte Carlo
• Determined optical specifications and
evaluated robustness of iTOP performance as
geometric parameters are varied beyond
specifications
• Many variations studied
• In general, the iTOP performance is tolerant
of imperfect ogeometries
• Library of results to evaluate science impact
of out of tolerance optics
19-20 March 2014
US Belle II Independent Project Review
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Quality Assurance
Zygo
prisms
ITT
mirrors
Zygo
bars
Acceptance testing
@KEK
Acceptance testing
@Cincinnati
19-20 March 2014
Aperture
bars
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Summary of Quartz Prototypes
• AOS/OOW – 4 bars ordered
– One completed vendor inspection December 5, 2013
– Meets specifications except thickness (19.87 mm)
– Other three scheduled for completion by April 2014
• Zygo Bars – 5 bars ordered
–
–
–
–
First bar delivered to KEK – meets all specifications
Second bar shipped on March 6, 2014
Next two bars scheduled for completion end of March
Fifth bar schedule for completion in April 2014
• ITT Mirrors – 5 ordered (4 with new specifications)
– First meets specifications, different than final specifications
– Three complete. Two slightly outside of specification
– Fifth lost earlier in fabrication, replacement 26 weeks out
• Zygo Prisms – 4 ordered
– All completed in Dec 2013 and meet all specifications
19-20 March 2014
US Belle II Independent Project Review
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WBS 1.02: Summary
• Optics specifications have been established
• Vendors (Zygo and ITT) proven to be able to produce optics to
specification with desired production rates
• Integration of optics into full system recently reviewed by the
Belle PAC which recommended “…that the purchase of the
quartz bars should proceed as soon as possible.”
19-20 March 2014
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WBS 1.03: Readout Systems
Level 2 Manager: Gary Varner (Hawaii)
Readout Systems
• Design, fabrication, testing, delivery to KEK, and
acceptance testing of the readout systems for the
iTOP (WBS 1.02) & KLM (WBS 1.04) detector systems
Block diagram of the Belle II
Trigger and DAQ system
19-20 March 2014
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iTOP Electronics
• Application Specific
Integrated Circuits
(ASICs) designed at U.
Hawaii
• Custom printed circuit
boards that carry
ASICs and amplifiers
• Processor boards with
FPGAs to control the
ASICS and process the
data from the ASICS
19-20 March 2014
16 ASICs per
board stack
US Belle II Independent Project Review
Four board stacks
per iTOP module
Processor board
with FPGA
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iTOP Electronics Requirements
Single photo electron
timing resolution 62ps
• Requirement: <100ps demonstrated in full system beam test
• Bench tests (above) have reached 62ps
• <50ps (higher gain amplifiers) in final design
19-20 March 2014
US Belle II Independent Project Review
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KLM Electronics
• Application Specific
Integrated Circuits (ASICs)
designed at U. Hawaii
• Several ASIC carrier boards
on 9U VME KLM subdetector readout module
• Processor boards with
FPGAs to control the ASICS
• Signal and HV distribution
board
19-20 March 2014
US Belle II Independent Project Review
ASIC on carrier board
KLM readout module
connected to Signal &
HV distribution board
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WBS 1.03 Summary
• Required performance of iTOP and KLM readout
systems achieved in beam and bench tests
• Final ASIC and readout electronics add performan
ce margin
and improved electro‐mechanical robustness
• Final ASIC designs are in fabrication
19-20 March 2014
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WBS 1.04: KLM Systems
Level 2 Manager: Leo Piilonen (Virginia Tech)
KLM Systems
• Design, fabricate, deliver to KEK and test the
barrel KLM scintillator readout modules for
layers 0 and 1
• Specify, procure, implement and commission
the high voltage power supplies for the barrel
and endcap KLM scintillator modules.
19-20 March 2014
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KL and muon detector
19-20 March 2014
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WBS 1.04 Completed: Oct 2013
• Deliver at least 32 detector modules that each
meet or exceed the threshold criteria of
– at least 80% efficiency for cosmic rays, averaged over all
strips in module (actual: 94%)
– 15+ MPPC pixels fired for cosmic rays passing through far
(mirrored) end of each scint strip (actual: ~30+ pixels)
– timing resolution of at least 10 ns (actual: ~6 ns)
– geometric coverage of active area: 92% in z-view, 95% in
phi-view, 92% in overlap (actual: 95–96%)
• 36 qualified modules delivered
19-20 March 2014
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WBS 1.05: Commissioning
Detectors
Level 2 Manager: Sven Vahsen (Hawaii)
Commissioning Detectors
• Purpose: to characterize beam-induced backgrounds
from new accelerator prior to Belle II detector roll-in
– Measurement of instantaneous and integrated radiation
 64 PIN diodes system
– Sensitivity to synchrotron light
 shield half of PIN diodes with gold paint
– Directional detection of fast neutrons
 8 micro-Time Projection Chambers
– Rigid, non-magnetic mechanical support for all sub-detectors
• Pre-production prototypes of both the PIN diode
system and micro-Time Projection Chambers have
met or exceeded all Key Performance Parameters
19-20 March 2014
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Commissioning Phases
Phase 1
SuperKEKB Commissioning Plan:
– Phase I (Jan 2015):
w/o final focus magnets,
No Belle Detector
– Phase II (Feb 2016):
with final focus magnets & Belle
w/o Si Detector
Phase 2
19-20 March 2014
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micro-Time Projector Chambers
Final DAQ
board
Field cage
assembly
Partially assembled prototype
Vacuum vessel
19-20 March 2014
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Project Ready for CD-2/3
• WBS 1.02: iTOP Optics
– Optics specifications have been established
– Vendors (Zygo and ITT) proven to be able to produce optics to
specification with desired production rates
– Ready to start optics production
• WBS 1.03: Readout Systems
– Required performance achieved in beam and bench tests
– Final ASIC and readout electronics add performance margin
– Final ASIC designs in fabrication
• WBS 1.04: KLM Systems
– Scope completed October 2013
• WBS 1.05: Commissioning Detectors
– Performance demonstrated with prototype systems
19-20 March 2014
US Belle II Independent Project Review
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