FToF Status Report CLAS Collaboration Meeting 1 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
Dec 17, 2015
FToF Status Report CLAS Collaboration Meeting 1
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
FToF Status Report CLAS Collaboration Meeting 2
Forward Time-of-Flight UpgradeJLab Designer
FTOF Panel 1aFTOF Panel 1b
Solenoid 5T
CTOF
SVT
Central Detector
DC R1, R2, R3
LTCC
PCAL
EC
HTCC
TORUS
Forward Detector
FToF Status Report CLAS Collaboration Meeting 3
Forward Time-of-Flight UpgradeJLab Designer
2
1
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Forward Time-of-Flight UpgradeJLab Designer
2
1a&b
Panel 1b
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Forward Time-of-Flight UpgradeJLab Designer
Panel 1b
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Forward Time-of-Flight UpgradeJLab Designer
Panel 1b
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Particle p-Θ Distributions in DIS Kinematics
45o
45o
45o
FToF Status Report CLAS Collaboration Meeting 8
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
FToF Status Report CLAS Collaboration Meeting 9
The Present Time-of-Flight System
15 cm width (forward angle)22 cm width (large angle)
0 : ElectronicsHas to be optimized!
1 : Scintillator and PMTHas to be optimized!
p : Path-Length VariationHas to be optimized!
Npe: # of photoelectronsHas to be tripled!
FToF Status Report CLAS Collaboration Meeting 10
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
FToF Status Report CLAS Collaboration Meeting
Time-of-Flight Test Results
FToF Status Report CLAS Collaboration Meeting
TDC and Electronics Resolution
The contribution fromelectronics includescontributions from theTDC, the NIM modules,cables, etc.
TDC resolution isdetermined with afixed cable delay.
tdc=30.5 ps
electronics=57.2 ps
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.
FToF Status Report CLAS Collaboration Meeting
Position Method ADC Cuts
FToF Status Report CLAS Collaboration Meeting
Resolution After ADC Cuts
262 ps206 ps240 ps153 ps
TL TDC Values TR TDC Values BL TDC Values BR TDC Values
TL TDC vs ADC TR TDC vs ADC BL TDC vs ADC BR TDC vs ADC
ADC
TD
C
Top TDC Difference Top TDC Sum Btm TDC Difference Btm TDC Sum
FToF Status Report CLAS Collaboration Meeting
Time-Walk Parameterization
FToF Status Report CLAS Collaboration Meeting
Resolution after TW Correction
153 ps 156 ps 175 ps 173 ps
TL TDC Values TR TDC Values BL TDC Values BR TDC Values
TL TDC vs ADC TR TDC vs ADC BL TDC vs ADC BR TDC vs ADC
ADC
TD
C
Top TDC Difference Top TDC Sum Btm TDC Difference Btm TDC Sum
FToF Status Report CLAS Collaboration Meeting
Resolution after Vertical Cut
157 ps170 ps150 ps150 ps
TL TDC Values TR TDC Values BL TDC Values BR TDC Values
TL TDC vs ADC TR TDC vs ADC BL TDC vs ADC BR TDC vs ADC
ADC
TD
C
Top TDC Difference Top TDC Sum Btm TDC Difference Btm TDC Sum
FToF Status Report CLAS Collaboration Meeting
Time-Walk Parameterization II
FToF Status Report CLAS Collaboration Meeting
Final Resolution for the Position Method
157 ps162 ps147 ps147 ps
TL TDC Values TR TDC Values BL TDC Values BR TDC Values
TL TDC vs ADC TR TDC vs ADC BL TDC vs ADC BR TDC vs ADC
ADC
TD
C
Top TDC Difference Top TDC Sum Btm TDC Difference Btm TDC Sum
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.
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 cm3
FToF Status Report CLAS Collaboration Meeting
ADC and Center Cut Resolution
Center cut +ADC cuts
Top
Middle
Bottom193 ps
counter= √2/3 ∗
FToF Status Report CLAS Collaboration Meeting
Time-Walk Parameterization
FToF Status Report CLAS Collaboration Meeting
Final Resolution Panel 1a Counter
122 ps
counter= √2/3 ∗
213*15*5 cm3
FToF Status Report CLAS Collaboration Meeting
186 ps
TDC Differences Raw Resolution
50*5*5 cm3
Three-Bar Method Panel 1b Counter
counter= √2/3 ∗
FToF Status Report CLAS Collaboration Meeting
ADC and Center Cut Resolution
Center cut +ADC cuts
134 ps
counter= √2/3 ∗
FToF Status Report CLAS Collaboration Meeting
Time-Walk Parameterization
FToF Status Report CLAS Collaboration Meeting
71.2 ps
Final Resolution Panel 1b Counter50*5*5 cm3
counter= √2/3 ∗
CLAS6 ToF resolutions for 400/50/400*5*5 cm3 counter= 118 psCLAS6 ToF resolutions divided by √3 counter= 71 ps
FToF Status Report CLAS Collaboration Meeting
Final Resolution Panel 1a Counter
122 ps
counter= √2/3 ∗
213*15*5 cm3
Extrapolated ToF resolution for 213*15*5 cm3 counter= 136 ps
Published ToF resolution for 213*15*5 cm3 counter= 118 ps
FToF Status Report CLAS Collaboration Meeting 32
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
FToF Status Report CLAS Collaboration Meeting 33
Action Items
Three Identical Bar Reference 8/2009 Detector Calibration System Design 9/2009 FastMC: Panel 1b/1a or 1a/1b 9/2009 FastMC: Small Polar Angle Acceptance 9/2009 Scintillator Pair Mockup 9/2009
accomplished by
FToF Status Report CLAS Collaboration Meeting 34
Key Milestones for PED and R&D
PMT and Scintillator Acquisition 9/2005 Assembly Hall Acquisition 8/2005 Infrastructure for Prototype Assembly 8/2006 Implementing Tests Procedures 8/2007 VME DAQ and LabView Run Control 8/2008 C++/ROOT Data Analysis 5/2009 Optimizing Detectors and Electronics 8/2009 Prototype Detector Beam Tests 3/2010 Final Detector Design 3/2010
accomplished by
FToF Status Report CLAS Collaboration Meeting 35
Key Milestones for Construction
Ordering All Detector Components 9/2009 5/2010 Testing All Detector Components 9/2009 9/2010 Staggered Assembly of ToF Counters1/2010 1/2011 Testing Calibration System 9/2009 9/2010 ToF Counter Frame 1/2010 1/2011 Mounting and Cabling 1/2011 7/2011 Readout and Final Testing 2/2011 9/2011
Start Finish
FToF Status Report CLAS Collaboration Meeting 36
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
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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