FToF Design and Overview Report CLAS12 ToF System Review 2009 1 Requirement and result driven design, construction, quality assurance, man power, time

1 FToF Design and Overview Report CLAS12 ToF System Review 2009

Requirement and result driven design, construction, quality assurance, man power,

time effort, timeline, and cost estimates

FToF Design and Overview Report

CLAS12 Time-of-Flight System Review 2009

Jefferson Lab, Newport News, VA

Ralf W. Gothe, Evan Phelps, Robert Steiman, and Ye Tian

University of South Carolina


Forward Time-of-Flight UpgradeJLab DesignerFTOF Panel 1a

FTOF Panel 1b

Solenoid 5T

CTOF

SVT

Central Detector

DC R1, R2, R3

LTCC

PCAL

EC

HTCC

TORUS

Forward Detector

CLAS12


Forward Time-of-Flight UpgradeJLab Designer

2

1



2

1a&b

Panel 1b



Panel 1b



Panel 1b


Forward Time-of-Flight Specifcitions

Panel 1b

Hamamatsu R9779: 4.5 in Electron Tubes 9214A: 7.0 in

No light guides!


Simulation of Various Light Guides

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

cm

Gordon Mutchler

Reflectivity0.9

0.7


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


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: Number of photoelectronsHas to be increased!

Npe increases by 5/2 = (AFTOF6/AFTOF12)(TTOF12/TTOF6)


Design Requirements and Results

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 accomplishedFTOF12 design counter yields ~ 40 ps (120 cm long)FTOF6 counter yields = 138 ps (213 cm long)

√2/5

BC-404


Light Attenuation

BC-404 with 160 cm (Saint Gobain) but 325 cm (measured) BC-408 with 380 cm (Saint Gobain) but 275 cm (measured)

BC-404


6 cm 6 cm BC-404/BC-408 Scintillatorstwo sides molded and two diamond-tool finished

Hamamatsu R9779 PMTsactive voltage divider, anode and dynode, inverter, with -shielding, will be glued directly onto the masked scintillator end window

Signal and HV CableRG-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 Stucturetwo counters will be taped to a support structure as before (CLAS6)

No Detector Calibration System neither Laser nor LED

Current Counter Construction and Design


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 Stationto degas the two-component scintillator glue mixture

Black Box

to perform PMT quality assurance in a light-tight environment

Construction Tools


6 cm 6 cm BC-404/BC-408 Scintillatorsare inspected for damages, inclusions, and refraction index inhomogeneities

Hamamatsu R9779 PMTsare tested for signal integrity, signal-to-noise ratio, gain, HV requirements, and magnetic field shielding

Counter Pre-Checkcounters 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-Methodposition 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

Quality Assurance


Assigned USC Manpower 2009/10

FacultyR.W. Gothe (PI)S. Strauch (CoPI)Ch. Djalali, Y. Ilieva, D. Tedeschi

Post DocK. Park (09) G. Fedotov (>10)

Graduate StudentsE. PhelpsL. Graham (MS)H. LuR. Steinman (MS)Y. TianD. Xue

Undergraduate StudentsJ. Giambernadino


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 TOF, , 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 , HV (sector by sector) 120 mh

Total 6520 mh

USC Time and Effort Estimate

(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)

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 TOF, , 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 , HV (sector by sector) 120 mh

Total 6520 mh


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

USC Construction Timeline Estimate


PMTs (PMT + Inverter) $ 729,300+Tax

Scintillators (Scintillator + Glue) $ 534,800+Tax

Shielding (-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

Current Cost Estimate

($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)

PMTs (PMT + Inverter) $ 729,300+Tax

Scintillators (Scintillator + Glue) $ 534,800+Tax

Shielding (-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


Supplement


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, -Shielding

Others: 2*CLAS ToF Counters, Detector Lab, Assembly Hall, Infrastructure


Solenoid (ITK) - Magnetic field distribution

0.00 0.02 0.04 0.06 0.08 0.10 0.120.00

0.02

0.04

0.06

0.08

0.10

0.12

0.0 0.2 0.4 0.6 0.8 1.0 1.20.0

0.2

0.4

0.6

0.8

1.0

1.2

0.0 0.2 0.4 0.6 0.8 1.0 1.20.0

0.2

0.4

0.6

0.8

1.0

1.2

0.0 1.0 2.0 3.0 4.0 5.0 6.00.0

1.0

2.0

3.0

4.0

5.0

6.0

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

A B

C D

Documents

FToF Design and Overview Report CLAS12 ToF System Review 2009 1 Requirement and result driven design, construction, quality assurance, man power, time