The tc status flavio gatti university and infn of genoa italy
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The TC: status. Flavio Gatti UNIVERSITY and INFN of Genoa, Italy. TC design review vs. DC and N2-Bag. Nitrogen Bag Not shown. Scintillating Fibers. Preamplifiers and cables. From COBRA center. 105 cm. 25 cm. 8.5 º. 19 º. 22 º. 11 º. B. B. Timing Counter: final desing review.

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

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The tc status flavio gatti university and infn of genoa italy

The TC:status.Flavio GattiUNIVERSITY and INFNof Genoa, Italy


Tc design review vs dc and n2 bag

TC design review vs. DC and N2-Bag

Nitrogen Bag

Not shown

Scintillating Fibers

Preamplifiers and cables


Timing counter final desing review

From COBRA

center

105 cm

25 cm

8.5º

19º

22º

11º

B

B

Timing Counter: final desing review

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

5mm

Scintillator Cross Section

5mm

PM active

diameter: 39 mm

Sectional view

PM outer

Diameter :52 mm

0.75 T

1.05 T

Long. view


Re shaped scintillating slab

Re-shaped Scintillating Slab

Curved Scintillating Fiber

Scintillating Slab

Hollow adapter and

Slab black cover


Comparison of meg tc with other timing detectors

Comparison of MEG TC with other timing detectors

  • MEG TC 4x4x90 BC404 R5924 270 38

Table form E.Nappi / Bari


Tc final design

TC Final Design

• A PLASTIC SUPPORT STRUCTURE ARRANGES THE

SCINTILLATOR BARS AS REQUESTED

• THE BARS ARE GLUED ONTO

THE SUPPORT

• INTERFACE ELEMENTS ARE GLUED ONTO THE BARS AND SUPPORT THE

FIBRES

• FIBRES ARE GLUED AS WELL

• TEMPORARY ALUMINIUM BEAMS ARE USED TO HANDLE THE DETECTOR DURING INSTALLATION

• PTFE SLIDERS WILL ENSURE

A SMOOTH MOTION ALONG THE RAILS


The tc status flavio gatti university and infn of genoa italy

• PMTs ARE ATTACHED, BY

MEANS OF THE INTERFACE SOCKET, TO THESCINTILLATOR BARS

• GIVEN THE MASS, AN ELASTIC AND REMOVABLE SILICONE GLUE IS

APPROPRIATE

• THE HOLLOW INTERFACE

ELEMENT 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 pmt socket below hollow interface and plastics bars

Under construction:PMT socket (beloW), hollow\interface and plastics bars


Curved tc trigger pattern apd test system

Copper block

APD

Splitters

Pulsed Laser

Peltier Cell

1/1000 attenuator

Integrating

Calibrated

Photometer

Fast Photodiode

Photomultiplier

Curved TC (trigger & pattern):APD test system

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 system

Curved detector: APD test system


Apd comparison psi blue new hamamatsu red

APD0210117506_20ID_M

APD0107115426_20ID_M

APD8411087442_20ID_M

APD8418088162_20ID_M

dark vs H.V. Temperature 20°C

APD8223084713_20ID_M

I

APD8201082393_20ID_M

APD1910145247_20ID_M

APD8024081013_20ID_M

1.00E+01

APD8007079173_20ID_M

APD791478311_20ID_M

APD1908145087_20ID_M

APD1905144927_20ID_M

APD1906145007_20ID_M

APD1909145167_20ID_M

APD1913145407_20ID_M

APD1902144767_20ID_M

APD1903144847_20ID_M

APD1911145327_20ID_M

APD8206082873_20ID_M

1.00E+00

APD1222134415_20ID_M

APD1212133615_20ID_M

APD1211133535_20ID_M

APD1213133695_20ID_M

APD1218134175_20ID_M

APD8710092535_20ID_M

APD8810094569_20ID_M

APD8822095449_20ID_M

APD8709092455_20ID_M

I Dark @ 10Mohm (Volts)

APD8722093575_20ID_M

APD8711092615_20ID_M

1.00E-01

APD8811094649_20ID_M

APD8619091391_20ID_M

APD8601089791_20ID_M

APD1512138823_20ID_M

APD1511138743_20ID_M

APD1822144554_20ID_M

APD1812143994_20ID_M

APD1704141813_20ID_M

APD1720142933_20ID_M

APD1613140756_20ID_M

APD1611140596_20ID_M

1.00E-02

APD1612140676_20ID_M

APD1616140996_20ID_M

APDJA0296_20ID_M

APDJA0302_20ID_M

APDJA0288_20ID_M

APDJA0307_20ID_M

APDJA0312_20ID_M

APDJA0308_20ID_M

APDJA0309_20ID_M

APDJA0311_20ID_M

APDJA0295_20ID_M

1.00E-03

APDJA0289_20ID_M

APDJa0290_20ID_M

2.50E+02

3.00E+02

3.50E+02

4.00E+02

4.50E+02

5.00E+02

APDJA0292_20ID_M

APDJA0294_20ID_M

APDJA0316_20ID_M

H.V. (Volts)

APDJA0304_20ID_M

APDJA0305_20ID_M

APD comparison: PSI(blue), new Hamamatsu (red)

I = 50 nA


The tc status flavio gatti university and infn of genoa italy

Kapton Flex.

APD

Black Coating

Electronics boards -10 channels

Scint. Fibers

Transition board

Copper Cold Finger(~20°)

Peltier Cell

Heat Exchanger

APD set-up: conceptual design

APD even and odd interleaved,

FRONT VIEW:

To be connected to the fibers

SIDE VIEW

with fiber, electronics, cooler


Apd read out final design

APD read-out: final design


Mc of the curved tc

5x5 mm scint. Fiber

APD readout

MC of the curved TC

  • L.Y.=8000 ph/Mev

  • Trap eff.= 7%

  • APD gain = 500 min.

  • Q ~ 1.5x10^5

  • Detect. eff. ~ 98%


Apd preamplifier

APD Preamplifier

  • ENC: 1500 e rms; Risetime:5 ns; Pulse-length: 50 ns


Banch test of the apds preamplifier

Banch test of the APDs Preamplifier

Test pulser

Output

1V/ pC

5.5 ns risetime


Encoding the hit pattern

From TC right side

From TC left side

152

152

A*B

A

B

152

Mask A

Mask B

Clock, control signal,

etc.

Control

Logic

Encoder

To Trigger

and

monitor

To VME

bus

Register

Encoding the hit pattern


The tc status flavio gatti university and infn of genoa italy

To be defined soon:

  • Definition of the supporting structure and construction (july)

  • Insert APD read-out system in the final design (july)

  • APD amplifier PCB and production (end of sept.)

  • Validation test at BTF (LNF) of 10 elements of curved detectors(sept.) (we are undertaking a preliminary test with cosmics)

  • Final construction of whole TC (sept-nov).

  • Estimate delivery of the timing counter end of november

  • Test @ BTF: december

    Under study (advanced status)

  • TC bag

  • TC curved detector: digital pattern generator

  • TC linear detector: DRS matching electronics


Provisional design of n2 bag

Provisional design of N2 bag


N2 bag inside cobra

N2 bag inside cobra


Access port on cobra flanges

Access port on cobra flanges


He diff in plastics film cm 3 m 2 atm mm day

He Diff. in Plastics Film( cm^3 m^2 )/( atm mm day)


The tc status flavio gatti university and infn of genoa italy

  • He input in the TC bag for EVAL F : few x 10-5 mbar/day


How to match the read out with drs

Attenuator

(passive)

Inverter

+ offset

0.15 - 1.7 V

To the DRS

Passive Splitter

To the DRS

Fast double Thres. Discr.

Shaper

+ offset

0.15 – 1.7 V

20 MHz reference

PM1

PM2

T1

Disc 1

T2

Disc 2

How to match the Read-out with DRS?


Summary

Summary

  • Scint Slab (BC404) resolution=91 ps

  • Timing resolution over the whole length = ±5% Max.

  • Plastics sizes, shapes and PM coupling works fine.

  • The solution has been indirectly validate in the COBRA

  • A test with the matching electronics with DRS in order to verify the readout solutions is foreseen in sept/oct.

  • Final design has been done and reviewed and the main parts of the TC are under construction ( BC404 slab, plastic black coverage, socket for PM, interface)

  • TC bag: a prototype design is under study, plastics we have considered EVOH, SARAN (FEP, Nylon 6, TEP Polyamide)

  • New batch of not irradiate APD have been delivered April. The test is positive ( 90% acceptance)

  • Electronics for APD. (1) Two solutions: high bandwidth OPA (lower cost-higher noise), integrated charge amplifier( higher cost, lower noise). -->Selected a mixed solution. (2) PCB that groups 8/10 APD (3) encoding with FPGA-VME.


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