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CLAS12 Time-of-Flight System Review 2009 Jefferson Lab, Newport News, VA

FToF Design and Overview Report. CLAS12 Time-of-Flight System Review 2009 Jefferson Lab, Newport News, VA. Requirement and result driven design, construction, quality assurance, man power, time effort, timeline, and cost estimates.

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CLAS12 Time-of-Flight System Review 2009 Jefferson Lab, Newport News, VA

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  1. FToF Design and Overview Report CLAS12 Time-of-Flight System Review 2009 Jefferson Lab, Newport News, VA Requirement and result driven design, construction, quality assurance, man power, time effort, timeline, and cost estimates Ralf W. Gothe, Evan Phelps, Robert Steiman, and Ye TianUniversity of South Carolina

  2. LTCC FTOF Panel 1a FTOF Panel 1b DC R1, R2, R3 Solenoid 5T PCAL Central Detector EC CTOF SVT HTCC Forward Detector TORUS CLAS12 JLab Designer Forward Time-of-Flight Upgrade

  3. JLab Designer Forward Time-of-Flight Upgrade 2 1

  4. JLab Designer Forward Time-of-Flight Upgrade 2 1a&b Panel 1b

  5. JLab Designer Forward Time-of-Flight Upgrade Panel 1b

  6. JLab Designer Forward Time-of-Flight Upgrade Panel 1b

  7. Forward Time-of-Flight Specifcitions • Hamamatsu R9779: 4.5 in • Electron Tubes 9214A: 7.0 in • No light guides! Panel 1b

  8. cm Simulation of Various Light Guides Gordon Mutchler Reflectivity 0.9 • The plot shows ratio of light that has entered the light guide to the amount that enters the glass envelope of the photomultiplier tube in dependence of the light guide length for two different reflectivities of the wrapping material. • … but penetrating axial magnetic fields 0.7

  9. Design Requirements To achieve Proton-Pion separation up to 5.3 GeV/c Proton-Kaon separation up to 4.5 GeV/c and Kaon-Pion separation up to 2.6 GeV/c an improved timing resolution ofs ~ 80ps is needed

  10. 15 cm width (forward angle) 22 cm width (large angle) The Present Time-of-Flight System s0 : Electronics Has to be optimized! s1 : Scintillator and PMT Has to be optimized! sp : Path-Length Variation Has to be optimized! Npe: Number of photoelectrons Has to be increased! Npeincreases by 5/2 = (AFTOF6/AFTOF12)*(TTOF12/TTOF6)

  11. √2/5 Design Requirements and Results With a resolution for the longest scintillators of better than ~150 ps for the current FTOF panel and BC-404 better than ~95 ps for the new FTOF panel a combined timing resolution ofs ~ 80ps can be accomplished FTOF12 design counter yieldss ~ 40ps (120 cm long) FTOF6 counter yieldss = 138ps (213 cm long)

  12. Light Attenuation BC-404 BC-404 with l = 160 cm (Saint Gobain) but ~325 cm (measured)BC-408 with l = 380 cm (Saint Gobain) but ~275 cm (measured)

  13. Current Counter Construction and Design • 6 cm * 6 cm BC-404/BC-408 Scintillators two sides molded and two diamond-tool finished • Hamamatsu R9779 PMTs active voltage divider, anode and dynode, inverter, with m-shielding, will be glued directly onto the masked scintillator end window • Signal and HV Cable RG-174 (BNC) and SCR (SHV) short pigtail, RG-58 (BNC) and RG-59 (SHV) to local sector readout and HV supply • Wrapping aluminized Mylar (scintillator), ligth-tight DuPontTM Tedlar (up to pigtail), black tape (end window mask) • Support Stucture two counters will be taped to a support structure as before (CLAS6) • No Detector Calibration System neither Laser nor LED

  14. Construction Tools • Six Centering Tools to center PMTs on scintillator end window during 24-hour curing process • Windmill Support Structure to load horizontally, glue vertically (PMT1), cure, rotate by 180o, glue vertically (PMT2), cure • Precision Cutter to cut the Tedlar film • Vacuum Station to degas the two-component scintillator glue mixture • Black Box to perform PMT quality assurance in a light-tight environment

  15. Quality Assurance • 6 cm * 6 cm BC-404/BC-408 Scintillators are inspected for damages, inclusions, and refraction index inhomogeneities • Hamamatsu R9779 PMTs are tested for signal integrity, signal-to-noise ratio, gain, HV requirements, and magnetic field shielding • Counter Pre-Check counters are inspected for void-free glued PMT-to-scintillator transition and light tightness, set to final gain-balanced HVs • Counter Full-Check with Three-Bar-Method position dependent and overall time resolutions, effective speed of light, left and right attenuation lengths (BAL and TAL) are programmatically analyzed and automatically stored • Database all acquired information is stored and retraceable

  16. Assigned USC Manpower 2009/10 • Faculty R.W. Gothe (PI) S. Strauch (CoPI) Ch. Djalali, Y. Ilieva, D. Tedeschi • Post Doc K. Park (09) G. Fedotov (>10) • Graduate Students E. Phelps L. Graham (MS) H. Lu R. Steinman (MS) Y. Tian D. Xue • Undergraduate Students J. Giambernadino

  17. USC Time and Effort Estimate QA PMT (signal integrity, noise, gain, HV, shielding) 384 mh C Scintillators (inspect, glue, inspect void-free bond, wrap) 3072 mh QA Detector (light tightness, gain-balanced HVs, DAQ check) 384 mh QA sTOF, l, ceff (10h three-bar method run, comprehensive analysis) 1152 mh C Pairing (backing structure, storage) 768 mh C Loading (single layer, individually anchored, foam protected) 288 mh C Unloading (storage at JLab) 160 mh C Assembly (assist sector assembly at JLab) 192 mh QA l, HV (sector by sector) 120 mh Total 6520 mh QA PMT (signal integrity, noise, gain, HV, shielding) 384 mh C Scintillators (inspect, glue, inspect void-free bond, wrap) 3072 mh QA Detector (light tightness, gain-balanced HVs, DAQ check) 384 mh QA sTOF, l, ceff (10h three-bar method run, comprehensive analysis) 1152 mh C Pairing (backing structure, storage) 768 mh C Loading (single layer, individually anchored, foam protected) 288 mh C Unloading (storage at JLab) 160 mh C Assembly (assist sector assembly at JLab) 192 mh QA l, HV (sector by sector) 120 mh Total 6520 mh (0.5h*1S*384*2) (4h*2S*384) (0.5h*2S*384) (3h*1S*384) (2h*2S*384/2) (0.5h*3S*384/2) (10’*5S*384/2) (0.5h*2S*384/2) (10h*2S*6)

  18. USC Construction Timeline Estimate Procurement 1 (PMTs, scintillators, and backing structures) 1/10 – 3/10 FY Fabrication 1 (PMTs, scintillators, and backing structures) 2/10 – 4/10 FY Construction 1 (detector assembly at USC) 3/10 – 1/12 FY QA 1 (concurrent with detector assembly at USC) 3/10 – 1/12 FY Procurement 2 (PMTs, scintillators, and backing structures) 1/11 – 3/11 FY Fabrication 2 (PMTs, scintillators, and backing structures) 3/11 – 1/12 FY Construction 2 (detector assembly at USC) 2/12 – 4/13 FY QA 2 (concurrent with detector assembly at USC) 2/12 – 4/13 FY Procurement 3 (cable and sector frames) 2/12 – 3/13 FY Construction 3 (detector assembly at JLab) 4/13 – 2/14 FY QA 3 (concurrent with detector assembly at JLab) 4/13 – 2/14 FY

  19. Current Cost Estimate PMTs (PMT + Inverter) $ 729,300+Tax Scintillators (Scintillator + Glue) $ 534,800+Tax Shielding (m-metal + active) $ 75,800+Tax Wrapping (Tedlar + Mylar + Tape + Foam) $ 18,700+Tax Cable (SHV + BNC + Adapter) $ 136,500+Tax Tools (Center + Windmill + Cutter + Degas + Black Box) $ 12,800+Tax Transportation (Packing + Shipping) $ 11,550+Tax Post Doc (Salary + Fringe) $ 87,150 Students (Man-hours * Wage + Accommodation + Travel) $ 88,700 Total $1,695,300+Tax PMTs (PMT + Inverter) $ 729,300+Tax Scintillators (Scintillator + Glue) $ 534,800+Tax Shielding (m-metal + active) $ 75,800+Tax Wrapping (Tedlar + Mylar + Tape + Foam) $ 18,700+Tax Cable (SHV + BNC + Adapter) $ 136,500+Tax Tools (Center + Windmill + Cutter + Degas + Black Box) $ 12,800+Tax Transportation (Packing + Shipping) $ 11,550+Tax Post Doc (Salary + Fringe) $ 87,150 Students (Man-hours * Wage + Accommodation + Travel) $ 88,700 Total $1,695,300+Tax ($880+$55)*(384*2+12) ($800/120cm*410cm/2*384) ($100+$100)*384 ($11200+$3000+$3000+$1500) ($54524+$47616+$34360) ($1800+$8000+$1500+$1000+$500) ($1050+$5000*2) ($58097/2*3) (6520h*$12.13+$4612+$5000)

  20. Supplement

  21. Acquisitions by 2009 • Electronics: NIM (LED, CFD), VME (TDCs), HV (CAEN), Readout (LabView) • Oscilloscopes: DPO 7254 (fast), 1 analog and 2 digital (slow) • PMTs: 2*9214 (Electron Tubes), 2*R9779 (Hamamatsu), 2*XP2020, 2*XP2020UR, 2*XP20Y0, 2*XP20D0 (Photonis) • Voltage Deviders: 2*C638A (Electron Tubes), 2*R9779 (Hamamatsu), 2*VD124KT, 2*VD127KT, 2*XP20Y0, 2*XP20D0 (Photonis) • Scintillators: EJ 204 (50, 100, 250 cm), EJ 200 (50, 100, 250, 400 cm) (ELJEN), BC 404 (20, 50 cm), BC 408 (50, 150, 400 cm) (Saint-Gobain) • Light Guides: 2*BC 802 (UV blind), 2*BC 800 (Saint-Gobain) • Wrapping: Tedlar Film, Aluminized Mylar Film, VM2000, Tape, m-Shielding • Others: 2*CLAS ToF Counters, Detector Lab, Assembly Hall, Infrastructure

  22. A B The field maps. A – General view, the marks are field level (T) B – Field Homogeneity, the marks are non-homogeneity values related to the central field. C – Magnetic flux lines, the marks are magnetic flux confined inside the corresponding surface of revolution (Wb). D – Stray field, the marks are field level (T). The field homogeneity in a polarized target volume is better than 2.14E-5 C D Solenoid (ITK) - Magnetic field distribution

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