1. FToF Status Report CLAS Collaboration Meeting1 Test Results, Ongoing Work, Still To-Do, and More … FToF Progress Report CLAS Collaboration Meeting June 2009 Jefferson Lab, Newport News, VA Ralf W. Gothe University of South Carolina

2. FToF Status Report CLAS Collaboration Meeting2 Forward Time-of-Flight Upgrade JLab Designer FTOF Panel 1a FTOF Panel 1b Solenoid 5T CTOF SVT Central Detector DC R1, R2, R3 LTCC PCAL EC HTCC TORUS Forward Detector

3. FToF Status Report CLAS Collaboration Meeting3 Forward Time-of-Flight Upgrade JLab Designer 2 1

4. FToF Status Report CLAS Collaboration Meeting4 Forward Time-of-Flight Upgrade JLab Designer 2 1a & b Panel 1b

5. FToF Status Report CLAS Collaboration Meeting5 Forward Time-of-Flight Upgrade JLab Designer Panel 1b

6. FToF Status Report CLAS Collaboration Meeting6 Forward Time-of-Flight Upgrade JLab Designer Panel 1b

7. FToF Status Report CLAS Collaboration Meeting7 Particle p-Θ Distributions in DIS Kinematics 45 o

8. FToF Status Report CLAS Collaboration Meeting8 Design Requirements Proton-Pion separation up to 5.3 GeV/c Kaon-Pion separation up to 2.6 GeV/c To achieve and an improved timing resolution of  ~ 80 ps is needed Proton-Kaon separation up to 4.5 GeV/c

9. FToF Status Report CLAS Collaboration Meeting9 The Present Time-of-Flight System 15 cm width (forward angle) 22 cm width (large angle)  0 : Electronics Has to be optimized!  1 : Scintillator and PMT Has to be optimized!  p : Path-Length Variation Has to be optimized! N pe : # of photoelectrons Has to be tripled!

10. FToF Status Report CLAS Collaboration Meeting10 Design Requirements better than ~ 150 ps for the current FTOF panel better than ~ 95 ps for the new FTOF panel With a resolution for the longest scintillators of and a combined timing resolution of  ~ 80 ps can be accomplished

11. FToF Status Report CLAS Collaboration Meeting Time-of-Flight Test Results

12. FToF Status Report CLAS Collaboration Meeting TDC and Electronics Resolution The contribution from electronics includes contributions from the TDC, the NIM modules, cables, etc. TDC resolution is determined with a fixed cable delay.  tdc =30.5 ps  electronics =57.2 ps

13. FToF Status Report CLAS Collaboration Meeting Position Method  The 5mm scintillator allows paths such as those labeled A and B.  Cut on ADC values to increase the ratio of B to A.  Correct for time-walk.  Cut on top/bottom time of flight to further reduce non-vertical paths.  Correct for time-walk again.

14. FToF Status Report CLAS Collaboration Meeting Position Method ADC Cuts

15. FToF Status Report CLAS Collaboration Meeting Resolution After ADC Cuts 262 ps206 ps240 ps 153 ps TL TDC ValuesTR TDC ValuesBL TDC ValuesBR TDC Values TL TDC vs ADCTR TDC vs ADCBL TDC vs ADCBR TDC vs ADC ADC TDC Top TDC DifferenceTop TDC SumBtm TDC DifferenceBtm TDC Sum

16. FToF Status Report CLAS Collaboration Meeting Time-Walk Parameterization

17. FToF Status Report CLAS Collaboration Meeting Resolution after TW Correction 153 ps156 ps175 ps173 ps TL TDC Values TR TDC Values BL TDC Values BR TDC Values TL TDC vs ADCTR TDC vs ADC BL TDC vs ADC BR TDC vs ADC ADC TDC Top TDC Difference Top TDC Sum Btm TDC DifferenceBtm TDC Sum

18. FToF Status Report CLAS Collaboration Meeting Vertical Cut Time of Flight Time between top and bottom bar (25ps bins)

19. FToF Status Report CLAS Collaboration Meeting Resolution after Vertical Cut 157 ps170 ps 150 ps TL TDC ValuesTR TDC ValuesBL TDC ValuesBR TDC Values TL TDC vs ADCTR TDC vs ADCBL TDC vs ADCBR TDC vs ADC ADC TDC Top TDC DifferenceTop TDC SumBtm TDC DifferenceBtm TDC Sum

20. FToF Status Report CLAS Collaboration Meeting Time-Walk Parameterization II

21. FToF Status Report CLAS Collaboration Meeting Final Resolution for the Position Method 157 ps162 ps 147 ps TL TDC ValuesTR TDC ValuesBL TDC ValuesBR TDC Values TL TDC vs ADCTR TDC vs ADCBL TDC vs ADCBR TDC vs ADC ADC TDC Top TDC DifferenceTop TDC SumBtm TDC DifferenceBtm TDC Sum

22. FToF Status Report CLAS Collaboration Meeting Three-Bar Method  Three bar method for prototype testing  Modified to include two identical reference bars and an exchangeable middle bar to quickly test scintillators of different lengths.  Three bar method with identical bars  Need method to verify reference bar resolutions.

23. FToF Status Report CLAS Collaboration Meeting Bottom Three-Bar Method Panel 1a Counter Top Raw Resolution 261 ps  counter = √2/3 ∗  TDC Differences 213 * 15 * 5 cm 3

24. FToF Status Report CLAS Collaboration Meeting ADC and Center Cut Resolution Center cut + ADC cuts Top Middle Bottom 193 ps  counter = √2/3 ∗ 

25. FToF Status Report CLAS Collaboration Meeting Time-Walk Parameterization

26. FToF Status Report CLAS Collaboration Meeting Final Resolution Panel 1a Counter 122 ps  counter = √2/3 ∗  213 * 15 * 5 cm 3

27. FToF Status Report CLAS Collaboration Meeting 186 ps TDC Differences Raw Resolution 50 * 5 * 5 cm 3 Three-Bar Method Panel 1b Counter  counter = √2/3 ∗ 

28. FToF Status Report CLAS Collaboration Meeting ADC and Center Cut Resolution Center cut + ADC cuts 134 ps  counter = √2/3 ∗ 

29. FToF Status Report CLAS Collaboration Meeting Time-Walk Parameterization

30. FToF Status Report CLAS Collaboration Meeting 71.2 ps Final Resolution Panel 1b Counter 50 * 5 * 5 cm 3  counter = √2/3 ∗  CLAS6 ToF resolutions for 400/50/400 * 5 * 5 cm 3  counter = 118 ps CLAS6 ToF resolutions divided by √3  counter = 71 ps

31. FToF Status Report CLAS Collaboration Meeting Final Resolution Panel 1a Counter 122 ps  counter = √2/3 ∗  213 * 15 * 5 cm 3 Extrapolated ToF resolution for 213 * 15 * 5 cm 3  counter = 136 ps Published ToF resolution for 213 * 15 * 5 cm 3  counter = 118 ps

32. FToF Status Report CLAS Collaboration Meeting32 Design Requirements better than ~ 150 ps for the current FTOF panel better than ~ 95 ps for the new FTOF panel extraploated ~ 87 ps With a resolution for the longest scintillators of and a combined timing resolution of  ~ 80 ps can be accomplished

33. FToF Status Report CLAS Collaboration Meeting33 Action Items  Three Identical Bar Reference8/2009  Detector Calibration System Design9/2009  FastMC: Panel 1b/1a or 1a/1b9/2009  FastMC: Small Polar Angle Acceptance9/2009  Scintillator Pair Mockup9/2009 accomplished by

34. FToF Status Report CLAS Collaboration Meeting34 Key Milestones for PED and R&D  PMT and Scintillator Acquisition9/2005  Assembly Hall Acquisition8/2005  Infrastructure for Prototype Assembly8/2006  Implementing Tests Procedures 8/2007  VME DAQ and LabView Run Control 8/2008  C++/ROOT Data Analysis5/2009  Optimizing Detectors and Electronics8/2009  Prototype Detector Beam Tests 3/2010  Final Detector Design3/2010 accomplished by

35. FToF Status Report CLAS Collaboration Meeting35 Key Milestones for Construction  Ordering All Detector Components 9/20095/2010  Testing All Detector Components 9/20099/2010  Staggered Assembly of ToF Counters1/20101/2011  Testing Calibration System9/20099/2010  ToF Counter Frame1/20101/2011  Mounting and Cabling1/20117/2011  Readout and Final Testing2/20119/2011 StartFinish

36. FToF Status Report CLAS Collaboration Meeting36 Assigned USC Manpower in 2009  Faculty  R.W. Gothe (PI)  S. Strauch  D. Tedeschi  Post Doc  (K. Park)  Graduate Students  E. Phelps  L. Graham (MS)  H. Lu  R. Steinman (MS)  Y. Tian  D. Xue  Undergraduate Students  J. Giambernadino

37. FToF Status Report CLAS Collaboration Meeting37 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 (ET), 2 * R9779 (Hamamatsu), 2 * XP2020, 2 * XP2020UR, 2 * XP20Y0, 2 * XP20D0 (Photonis)  Voltage Deviders: 2 * C638A (ET), 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, Tape,  -Shielding  Others: 2 * CLAS ToF Counters, Detector Lab, Assembly Hall, Infrastructure