Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 11
The TC:The TC:status.status.
Flavio GattiFlavio Gatti UNIVERSITY and INFNUNIVERSITY and INFN
of Genoa, Italyof Genoa, Italy
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 22
TC design review vs. DC and N2-BagTC design review vs. DC and N2-Bag
Nitrogen BagNot shown
Scintillating Fibers
Preamplifiers and cables
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 33
Timing Counter: Timing Counter: final desing reviewfinal desing review
Scintillator Cross Section 5mm
PM outerDiameter :52 mm
PM activediameter: 39 mm
19º 22º8.5º
From COBRA center
105 cm
11º
25 cm
BB
0.75 T1.05 T
Scintillator Slab☺ 20°rotation increase
response uniformity and timing performance achievable by using the coincidences
☺ Positron Path-Length (5 cm)enough for the required Timing Res.
☺ Maximal Matching Scintillator-PM
-> Note: cut of upper edge(5mm in radial direction in order to avoid TC-D.C. contact
-> lower edge is also cut away in order to have
symmetrical shape
☺ Optimal compromise between PM field gain suppression factor availabe space. PM tilted of ~20º respect to the Mag.Field, ~10º respect to the axis
Sectional view
Long. view
5mm
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 44
Re-shaped Scintillating SlabRe-shaped Scintillating Slab
Curved Scintillating Fiber
Scintillating Slab
Hollow adapter andSlab black cover
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 55
Comparison of MEG TC with Comparison of MEG TC with other timing detectorsother timing detectors
MEG TCMEG TC 4x4x90 BC404 R5924 270 38 4x4x90 BC404 R5924 270 38
Table form E.Nappi / Bari
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 66
TC Final DesignTC Final Design• A PLASTIC SUPPORT STRUCTURE ARRANGES THESCINTILLATOR BARS AS REQUESTED
• THE BARS ARE GLUED ONTOTHE SUPPORT
• INTERFACE ELEMENTS ARE GLUED ONTO THE BARS AND SUPPORT THEFIBRES
• FIBRES ARE GLUED AS WELL
• TEMPORARY ALUMINIUM BEAMS ARE USED TO HANDLE THE DETECTOR DURING INSTALLATION
• PTFE SLIDERS WILL ENSUREA SMOOTH MOTION ALONG THE RAILS
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 77
• PMTs ARE ATTACHED, BYMEANS OF THE INTERFACE SOCKET, TO THESCINTILLATOR BARS
• GIVEN THE MASS, AN ELASTIC AND REMOVABLE SILICONE GLUE ISAPPROPRIATE
• THE HOLLOW INTERFACEELEMENT IS A “CUSTOMDESIGNED”PROFILE THAT ADDS A MINIMUM AMOUNT OF MATERIAL BETWEEN THE FIBRES AND THE BARS
• SLOT FOR CABLES and OPTICAL FIBERS HAVE BEEN FORESEEN TO
ALLOW THE CABLES FROM THE INNER PMT TO EXIT
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 88
Under construction:Under construction:
PMT socket (beloW), hollow\interface and plastics barsPMT socket (beloW), hollow\interface and plastics bars
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 99
Curved TC (trigger & pattern):Curved TC (trigger & pattern):APD test systemAPD test system
Pulsed Laser
Integrating CalibratedPhotometer
Fast Photodiode
Photomultiplier
1/1000 attenuator
Splitters
APDCopper block
Peltier Cell
A batch of not irradiated about 1100 APDs has been received in April. These are under test for selection and binning (grouping APDs with same V-breakdown). The test set-up allow automatic data acquisition by using pulsed laser response.
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 1010
Curved detector: APD test systemCurved detector: APD test system
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 1111
I dark vs H.V. Temperature 20°C
1.00E-03
1.00E-02
1.00E-01
1.00E+00
1.00E+01
2.50E+02 3.00E+02 3.50E+02 4.00E+02 4.50E+02 5.00E+02
H.V. (Volts)
I D
ark
@ 1
0M
oh
m (
Vo
lts)
APD0210117506_20ID_MAPD0107115426_20ID_MAPD8411087442_20ID_MAPD8418088162_20ID_MAPD8223084713_20ID_MAPD8201082393_20ID_MAPD1910145247_20ID_MAPD8024081013_20ID_MAPD8007079173_20ID_MAPD791478311_20ID_MAPD1908145087_20ID_MAPD1905144927_20ID_MAPD1906145007_20ID_MAPD1909145167_20ID_MAPD1913145407_20ID_MAPD1902144767_20ID_MAPD1903144847_20ID_MAPD1911145327_20ID_MAPD8206082873_20ID_MAPD1222134415_20ID_MAPD1212133615_20ID_MAPD1211133535_20ID_MAPD1213133695_20ID_MAPD1218134175_20ID_MAPD8710092535_20ID_MAPD8810094569_20ID_MAPD8822095449_20ID_MAPD8709092455_20ID_MAPD8722093575_20ID_MAPD8711092615_20ID_MAPD8811094649_20ID_MAPD8619091391_20ID_MAPD8601089791_20ID_MAPD1512138823_20ID_MAPD1511138743_20ID_MAPD1822144554_20ID_MAPD1812143994_20ID_MAPD1704141813_20ID_MAPD1720142933_20ID_MAPD1613140756_20ID_MAPD1611140596_20ID_MAPD1612140676_20ID_MAPD1616140996_20ID_MAPDJA0296_20ID_MAPDJA0302_20ID_MAPDJA0288_20ID_MAPDJA0307_20ID_MAPDJA0312_20ID_MAPDJA0308_20ID_MAPDJA0309_20ID_MAPDJA0311_20ID_MAPDJA0295_20ID_MAPDJA0289_20ID_MAPDJa0290_20ID_MAPDJA0292_20ID_MAPDJA0294_20ID_MAPDJA0316_20ID_MAPDJA0304_20ID_MAPDJA0305_20ID_M
APD comparison: PSI(blue), APD comparison: PSI(blue), new Hamamatsu (red)new Hamamatsu (red)
I = 50 nA
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 1212
Peltier Cell
Copper Cold Finger(~20°)
Scint. Fibers
Black Coating
APD
Heat Exchanger
Electronics boards -10 channels
Transition board
Kapton Flex.
APD even and odd interleaved,
FRONT VIEW:To be connected to the fibers
SIDE VIEW with fiber, electronics, cooler
APD set-up: conceptual design
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 1313
APD read-out: final design
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 1414
MC of the curved TCMC of the curved TC
L.Y.=8000 ph/MevL.Y.=8000 ph/Mev Trap eff.= 7%Trap eff.= 7% APD gain = 500 min.APD gain = 500 min. Q ~ 1.5x10^5Q ~ 1.5x10^5 Detect. eff. ~ 98%Detect. eff. ~ 98%
0
0.1
0.2
0.3
0.4
0.5
0.6
1 2 3 4 5 6 7 8 9
Number of Fiber Crossed
Pro
bab
ility
0
0.005
0.01
0.015
0.02
0.025
0.03
0.035
0.04
0.045
0 20 40 60 80 100 120
cobra axis (z, cm)cr
ossi
ng p
roba
bilit
y (a
.u)
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0 0.5 1 1.5 2 2.5
track length in the first crossed fiber (cm)
pro
bab
iliy
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0 1 2 3 4
Energy Loss in the first crossed fiber (MeV)
Pro
bab
ilit
y
5x5 mm scint. FiberAPD readout
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 1515
APD PreamplifierAPD Preamplifier
ENC: 1500 e rms; Risetime:5 ns; Pulse-length: 50 nsENC: 1500 e rms; Risetime:5 ns; Pulse-length: 50 ns
VF3
R8
33
0
R7 13k
+
-
+DIS
U2 OPA847
T1 2N3955
C3
10
0p
V4 5
R4 10
R1
10
0k
C4 1p
R6 100k
R5
33
0
R3 10
+
-
+DIS
U1 OPA847
IG1
V3 400
R2
10
0k
C2
80
p
C1 10n
V2 5
V1 5
T2 2N3955
2 x MMBF43922 x OPA847
145000 e-
1ns
DIS-----
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 1616
Banch test of the APDs Banch test of the APDs PreamplifierPreamplifier
1V/ pC5.5 ns risetime
Test pulser
Output
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 1717
Encoding the hit patternEncoding the hit pattern
152
152
Mask A
Mask B
A B A*B
152
Encoder
Clock, control signal,etc.
To Trigger andmonitor
Register
To VMEbus
ControlLogic
From TC left side
From TC right side
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 1818
To be defined soon:To be defined soon: Definition of the supporting structure and construction (july)Definition of the supporting structure and construction (july) Insert APD read-out system in the final design (july)Insert APD read-out system in the final design (july) APD amplifier PCB and production (end of sept.)APD amplifier PCB and production (end of sept.) Validation test at BTF (LNF) of 10 elements of curved Validation test at BTF (LNF) of 10 elements of curved
detectors(sept.) (we are undertaking a preliminary test with cosmics)detectors(sept.) (we are undertaking a preliminary test with cosmics) Final construction of whole TC (sept-nov).Final construction of whole TC (sept-nov). Estimate delivery of the timing counter end of novemberEstimate delivery of the timing counter end of november Test @ BTF: decemberTest @ BTF: december
Under study (advanced status)Under study (advanced status) TC bagTC bag TC curved detector: digital pattern generatorTC curved detector: digital pattern generator TC linear detector: DRS matching electronicsTC linear detector: DRS matching electronics
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 1919
Provisional design of N2 bagProvisional design of N2 bag
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 2020
N2 bag inside cobraN2 bag inside cobra
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 2121
Access port on cobra flangesAccess port on cobra flanges
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 2222
He Diff. in Plastics FilmHe Diff. in Plastics Film( cm^3 m^2 )/( atm mm day)( cm^3 m^2 )/( atm mm day)
Thermoplastic, Ethylene Vinyl Alcohol Eval F Eval Company helium 5 0 1.06
Thermoplastic, Ethylene Vinyl Alcohol Eval F Eval Company helium 23 0 3.66
Thermoplastic, Ethylene Vinyl Alcohol Eval F Eval Company helium 35 0 5.39
Thermoplastic, Ethylene Vinyl Alcohol Eval H Eval Company helium 5 0 1.81
Thermoplastic, Ethylene Vinyl Alcohol Eval H Eval Company helium 23 0 6.54
Thermoplastic, Ethylene Vinyl Alcohol Eval H Eval Company helium 35 0 9.37
Thermoplastic, Ethylene Vinyl Alcohol Eval E Eval Company helium 5 0 2.6
Thermoplastic, Ethylene Vinyl Alcohol Eval E Eval Company helium 23 0 9.37
Thermoplastic, Ethylene Vinyl Alcohol Eval E Eval Company helium 35 0 14.02
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 2323
Thermoplastic, Fluoro, CTFE Kel-F 81 3M helium 25 142.5
Thermoplastic, Fluoro, ETFE Tefzel DuPont helium 25 0.102 354
Thermoplastic, Fluoro, ETFE Hyflon 700 Ausimont helium 23 591
Thermoplastic, Fluoro, ETFE Hyflon 800 Ausimont helium 23 591
Thermoplastic, Fluoro, PVDF Solef Solvay helium 23 0.1 86
Thermoplastic, Nylon 6 helium 35 0 45.7
Thermoplastic, Nylon 66 Zytel 42 DuPont helium 23 50 59.1
Thermoplastic, Polyester, PET helium 35 0 70.9
Thermoplastic, Polyethylene, HDPE Marlex Phillips helium 23 97
Thermoplastic, Polyethylene, HDPE Hostalen Hoechst AG helium 20 152
Thermoplastic, Polyethylene, HDPE Hostalen Hoechst AG helium 30 212.8
Thermoplastic, Polyethylene, HDPE Hostalen Hoechst AG helium 50 466.1
Thermoplastic, Polyethylene, LDPE helium 25 0 639
Thermoplastic, Polyimide Upilex R Ube helium 30 0.025 55.9
Thermoplastic, Polysulfone Udel Amoco Performance Products helium 23 772
Thermoplastic, Polyvinylidene Chloride Saran 5253 Dow Chemical helium 35 0 10.8
TPE, Polyamide Pebax 6333 Atochem helium 23 0.12 302
TPE, PolyamidePebax 5533 Atochem helium 23 0.12 46
He input in the TC bag for EVAL F : few x 10-5 mbar/dayHe input in the TC bag for EVAL F : few x 10-5 mbar/day
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 2424
How to match the Read-out with DRS?How to match the Read-out with DRS?
Fast double Thres. Discr.
Inverter + offset
Attenuator(passive)
Shaper+ offset
0.15 - 1.7 V
Passive SplitterTo the DRS
To the DRS0.15 – 1.7 V
20 MHz reference
PM1
PM2
Disc 1
Disc 2
T1
T2
Flavio Gatti, PSI, july 18Flavio Gatti, PSI, july 18thth, 2005, 2005 2525
Summary Summary Scint Slab (BC404) resolution=91 psScint Slab (BC404) resolution=91 ps Timing resolution over the whole length = ±5% Max.Timing resolution over the whole length = ±5% Max. Plastics sizes, shapes and PM coupling works fine.Plastics sizes, shapes and PM coupling works fine. The solution has been indirectly validate in the COBRAThe solution has been indirectly validate in the COBRA A test with the matching electronics with DRS in order to A test with the matching electronics with DRS in order to
verify the readout solutions is foreseen in sept/oct.verify the readout solutions is foreseen in sept/oct. Final design has been done and reviewed and the main parts of Final design has been done and reviewed and the main parts of
the TC are under construction ( BC404 slab, plastic black the TC are under construction ( BC404 slab, plastic black coverage, socket for PM, interface)coverage, socket for PM, interface)
TC bag: a prototype design is under study, plastics we have TC bag: a prototype design is under study, plastics we have considered EVOH, SARAN (FEP, Nylon 6, TEP Polyamide)considered EVOH, SARAN (FEP, Nylon 6, TEP Polyamide)
New batch of not irradiate APD have been delivered April. The New batch of not irradiate APD have been delivered April. The test is positive ( 90% acceptance)test is positive ( 90% acceptance)
Electronics for APD. (1) Two solutions: high bandwidth OPA Electronics for APD. (1) Two solutions: high bandwidth OPA (lower cost-higher noise), integrated charge amplifier( higher (lower cost-higher noise), integrated charge amplifier( higher cost, lower noise). -->Selected a mixed solution. (2) PCB that cost, lower noise). -->Selected a mixed solution. (2) PCB that groups 8/10 APD (3) encoding with FPGA-VME.groups 8/10 APD (3) encoding with FPGA-VME.