The TC: status. Flavio Gatti UNIVERSITY and INFN of Genoa, Italy

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


TC design review vs. DC and N2-BagTC design review vs. DC and N2-Bag

Nitrogen BagNot shown

Scintillating Fibers

Preamplifiers and cables


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


Re-shaped Scintillating SlabRe-shaped Scintillating Slab

Curved Scintillating Fiber

Scintillating Slab

Hollow adapter andSlab black cover


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


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


• 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


Under construction:Under construction:

PMT socket (beloW), hollow\interface and plastics barsPMT socket (beloW), hollow\interface and plastics bars


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.


Curved detector: APD test systemCurved detector: APD test system


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


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


APD read-out: final design


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


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-----


Banch test of the APDs Banch test of the APDs PreamplifierPreamplifier

1V/ pC5.5 ns risetime

Test pulser

Output


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


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


Provisional design of N2 bagProvisional design of N2 bag


N2 bag inside cobraN2 bag inside cobra


Access port on cobra flangesAccess port on cobra flanges


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 H Eval Company helium 5 0 1.81



Thermoplastic, Ethylene Vinyl Alcohol Eval E Eval Company helium 5 0 2.6




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


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


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.

The TC: status. Flavio Gatti UNIVERSITY and INFN of Genoa, Italy

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