Hall B 12 GeV Upgrade System

1
Hall B 12 GeV Upgrade System Safety
ReviewSummary
Latifa Elouadrhiri Hall B 12 GeV Control Account
Manager
2
CLAS12 Design Parameters
The physics program allows to firmly establish
requirements for the CLAS12 performance in terms
of rate capability, particle ID, and
resolution. (See Burkert Talk)
3
Torus and Solenoid Magnets
Reference Design Max. field B5
Tesla Homogeneity ?B/Blt10-4 Main coil 4000
turns Shielding coil 1880 turns Stored energy
25 MJ
Reference Design coils 6 Radial thickness
294mm Width 100mm Stored energy 14MJ
4
Procurement Schedule TORUS
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Procurement Schedule Solenoid
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Silicon Vertex tracker

• BST and FST designs can achieve the physics
• specifications
• robust and proven design
• Q coverage BST 35o 125o FST5o 35o
• F coverage 2p
• BST 4 regions (u-v graded stereo 0o 3o)
• FST 3 regions each with u-v stereo strips ( /-
  12o )
• Good segmentation, good resolution
• High efficiency for track reconstruction over all
  f
• Low rate of fake tracks at L1035 cm-2s-1
• Good missing momentum resolution, matched to the
  forward detector
• Proven by a full event simulation and
  reconstruction program

7
Drift Chambers

• DCs similar to present chambers
• 6 sectors, 3 regions
• 2 super-layers/region (/- 6o stereo)
• 6 layers/super-layer
• robust track-finding
• Several improvements to design
• planar chamber design
• drift cells identical, easier to calibrate
• all chambers are self-supporting
• improves maintenance, speeds repair
• use of 30mm diameter sense wire
• shorter drift time, more linear x vs. t
• Extensive design and prototyping complete
• design works!
• ready to begin procurement process

May 8, 2008
CLAS12 Detector Review
Mac Mestayer
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High Threshold Cerenkov Counter (HTCC)

• Works in conjunction with CLAS Low
  ThresholdCerenkov Counter and Preshower
  Calorimeter and the CLAS Electromagnetic
  Calorimeter, to provide electron identification
  in full kinematics
• Optical properties defined
• Response to electrons, pions, and background
  particles simulated in detail, and meets
  requirements for high pion rejection
• Operation in magnetic field is used as input for
  the design of the solenoid magnet
• Sensitivity of PMTs to magnetic field addressed
  in RD plan for prototype of multi-layer magnetic
  shield.
• Light-weight mirror construction techniques
  developed to limit impact on 3-momentum
  resolution
• Light readout segmentation allows use in trigger
  decisions

9
Pre-Shower Calorimeters (PCAL)

• Provide sufficient granularity and position
  resolution for the separation of photons and p0
  for momentaup to 10 GeV/c
• Add 5 radiation lengths in depth to EC and
  provide full shower and energy containment
• Choose design readout that allows use of low-cost
  extruded scintillator material and low cost PMTs
• Non-projective geometry greatly simplifies
  construction and allows significant cost savings
• Full GEANT simulation to optimize readout
  segmentation

10
Central Time of Flight

• CTOF design with R2083, magnetic shield, and bent
  Light Guides will likely achieving the 60 ps
  timing resolution. This is based on a realistic
  prototype, high statistics tests, and MC
  calculations.
• Further RD work that is currently underway may
  allow lt 60 ps.
  
  
  
• The design allows simple integration of other
  PMTs and achieving the desired performance
  independently on other systems.
  
  
  
• Extensive documentation of RD work is
  publically available in Nucl. Inst. Meth. and
  CLAS notes.
  
  
  
  
• Safety considerations and QA processes have been
  defined and are being incorporated in design,
  component construction, assembly.

11
Forward Time-of-Flight
12
Design Drawings
DC R2 End Plate Detail
PCAL PMT Header
HTCC Main Assembly
CTOF Fwd light guide support
13
Detector Design and Integration

• Design solutions for all detectors are well
  advanced and many are into making detail
  fabrication drawings.
• Integration of detectors and magnets is being
  addressed and magnet specifications being
  written.
• For systems that mount on the magnets, interface
  requirements will be part of specifications for
  both components.
• Installation and maintenance procedures have been
  addressed in detector designs.
• Installation plan shows ample float.
• Safety plan is well developed and special issues
  including onsite assembly and installation have
  been addressed.

14
Online DAQ Electronics

• CLAS12 DAQ will meet requirements 10kHz event
  rate, 100MB/s data rate, lt15 dead time
• CLAS12 Trigger System will be able to reliably
  identify electrons and select multi-particle
  events
• CLAS12 Electronics exists or currently under
  development in JLAB
• CLAS12 Online System main components exist and
  will be integrated into Experiment Control System

15
Detector Simulation and Event reconstruction

• Full modeling of the CLAS12 Detectors and
  magnetic field in place
• Detail simulation in the presence of
  electromagnetic and hadronic background has been
  performed
• CLAS12 can operate at the design luminosity
• Track reconstruction code based on Kalman Filter
  has been developed for both the forward and
  central detectors
• Derived resolutions satisfies the physics
  requirements
• High tracking efficiency at the design luminosity
  1035cm-2s-1
• Excellent track matching between Drift Chamber
  system and Forward SVT
• Forward SVT provides large improvements on track
  parameters
• 3-10 times better for the vertex, 1.2 -1.9 for f

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Summary

• CLAS12 technical performance parameters are well
  defined
• Burkert talk on physics requirements, and the
  individual system talks
• Construction plans for each system are
  well-developed assembly plans consistent with
  Upgrade and Hall B installation schedule
• Baseline project plan in Cost book and P3e
  schedule
• Summary presented in Elouadrhiri morning talk,
  and Dave kashy for the overall schedule of
  installation and integration
• See the individual system talk
• Detector likely to achieve performance with low
  risk
• Overall Low risk based on
• Cost and schedule estimates well-founded and
  well-documented
• System integration plan within CLAS12 and Hall B
  is well studied and developed
• Details presented in Kashy talk
• ESH aspects of construction and commissioning
  have been incorporated into project plan

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Hall B/12GeV Upgrade Documentation

• V. Baturin et al., Time-of-Flight resolution of
  scintillating counters with Burle 85001
  micro-channel plate photo-multipliers in
  comparison with Hamamatsu R2083, NIM A 562, 327
  (2006).
• V. N. Batourine et al., Measurements of PMT time
  resolution at KNU, CLAS-Note 2004-16.
• V. N. Batourine et al., Studies of time
  resolution of the Burle 85001 micro-channel plate
  photo-multipliers in comparison with standard
  PMTs, CLAS-Note 2004-39.
• V. N. Batourine et al., Status report on studies
  at Kyungpook National University in 2005,
  CLAS-Note 2005-3.
• F. Barbosa et al., Status and further steps
  towards the CLAS12 start-counter, CLAS-Note
  2006-11.
• F. Barbosa et al., Time resolution measurements
  with Burle 85011 micro-channel plate
  photo-multiplier, to be published.
• V. Baturin et al., Optical tests of cast Acrylic
  rods for the CTOF light guide, CLAS-Note, to be
  published.
• V. Baturin et al., Magnetic shielding for the
  CLAS12 CTOF detector, CLAS-Note, to be
  published.
• V. Baturin et al., Year 2007/2008 plan for
  mechanical design of the CTOF detector, 2008,
  internal document.
• V. Baturin et al., Year 2008 Plan for RD on the
  CTOF/CAL detector, 2007, internal document.
• V. Baturin et al., Commissioning of the Central
  TOF detector, 2008, internal document.
• FASTMC is a fast parametric Monte Carlo of
  CLAS12 the code and documentation are contained
  in CVS under 12GeV/fastmc.
• PAC30 report, http//www.jlab.org/exp_prog/PACpage
  /PAC30/PAC30_report.pdf, 2006.
• A. Yegneswaran et al., Proposal to Study a
  Section of the Silicon Vertex Tracker Envisioned
  for CLAS12, CLAS-Note 2004-042, (2004).

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Hall B/12GeV Upgrade Documentation, cont.

• M. A. Antonioli et al., Two Possible
  Configurations of the Silicon Vertex Tracker,
  CLAS-Note 2006- 21, (2006).
• M. Halappanavar et al., Silicon Vertex
  Trackers Simulation Status, CLAS-Note 2004-13,
  (2004).
• A. V. Vlassov et al., Background Study for the
  Central Detector Planned for the 12GeV Upgrade of
  CLAS, CLAS-Note 2006-20, (2006).
• B. Eng et al., Simulation of the SVX4 ASICs
  Performance, CLAS-Note 2006-13, (2004).
• B. Eng et al., Dead Time Due to the Frequency
  of Reset and Restore Operations of the SVX4
  ASICs, CLAS-Note 2006-24, (2006).
• P. Bonneau et al., A New Type of Single Board
  Computer for Detectors, CLAS-Note 2004-13,
  (2004).
• T. Chinwanawich et al., Status Report on the
  Prototyping of Silicon Vertex Tracker, CLAS-Note
  2004- 029, (2004).
• Hall B Instrumentation Group, Silicon Vertex
  Trackers Prototype Progress, CLAS-Note
  2005-009, (2005).
• M. A. Antonioli et al., FY05 RD on the SVT
  Data Acquisition System, CLAS-Note 2005-016,
  (2005).
• M. A. Antonioli et al., FY05 RD on the SVT
  High Voltage Control Program, CLAS-Note
  2005-017, (2005).
• M. A. Antonioli et al., FY05 RD on the SVT
  Low Voltage Control Program, CLAS-Note 2005-018,
  (2005).
• M. A. Antonioli et al., SVTs RD Annual
  Report FY05, CLAS-Note 2005-020, (2005).
• M. A. Antonioli et al., SVTs RD for FY06,
  CLAS-Note 2005-019, (2005).
• P. Bonneau et al., FY06 RD Status Report,
  CLAS-Note 2006-010, (2006).
• V. Baturin et al., Nucl. Instr. and Meth. A
  562, 327 (2006).

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Hall B/12GeV Upgrade Documentation, cont.

• V. N. Batourine et al., Measurement of PMT
  time resolution at Kyungpook National
  University, CLAS-Note 2004-16, (2004) V. N.
  Batourine et al., Studies of time resolution of
  the Burle 85001 micro-channel plate
  photo-multipliers in comparison with standard
  PMTs, CLAS-Note 2004-39, (2004).
• V. N. Batourine et al., Status Report on the
  Studies at Knungpook National University in
  2005, CLAS-Note 2005-3, (2005).
• F. Barbosa et al., Status and further steps
  towards the CLAS12 start-counter,
  CLAS-Note2006-011. (2006).
• V. Knznetsov, Time resolution of fine mesh
  PMTs with cosmic rays, to be submitted as
  CLAS-Note, (2007).
• Gordon Mutchler and Y. Sharabian, Wrapping
  Tests and Monte Carlo evaluation of a new Highly
  Segmented CLAS Start Counter, CLAS-Note
  2005-004, (2005).
• F. Barbosa and V. Popov, The assembly of MCP
  PM Burle 85011 with the on-board preamplifier,
  to be submitted as CLAS-Note (2007).
• N. Dashyan and S. Stepanyan, Geant simulations
  of the CLAS12 pre-shower calorimeter, CLAS- Note
  2007-001, (2007).
• K. Whitlow, N. Dashyan and S. Stepanyan, The
  CLAS12 pre-shower performance studies,
  CLAS- Note 2007-002, (2007).
• Ph. Rosier, Preliminary Finite Element Analysis
  of the Preshower Calorimeter for the CLAS12.
• N. Dashyan and S. Stepanyan, Improved
  Reconstruction Algorithm for the CLAS Forward
  Calorimeter, CLAS-Note 2006-016, (2006).
• FNAL Extruder http//www.nicadd.niu.edu/research
  /extruder.

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Hall B/12GeV Upgrade Documentation, cont.

• K. Giovanetti and A. Stavola, Fiber adapters
  for pre-shower tests (JMU).
• S. Pozdnyakov, Study of Flash ADCs as a new
  electronics for CLAS, CLAS-Note 2006-023,
  (2006).
• C. Smith, to be submitted as CLAS-Note, (2007).
• K. Mikhailov et al., On-line trigger study for
  CLAS12, CLAS-Note 2007-009, (2007).
• Hall B 12 GeV Upgrade Technical Design report
• Version 4, May 3 2008