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 GattiUNIVERSITY and INFNof 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

8.5º

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

Curved Scintillating Fiber

Scintillating Slab

Hollow adapter and

Slab black cover


Comparison of MEG TC with other timing detectors

  • MEG TC 4x4x90 BC404 R5924 270 38

Table form E.Nappi / Bari


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


• 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


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


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


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


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

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


Banch test of the APDs Preamplifier

Test pulser

Output

1V/ pC

5.5 ns risetime


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


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


N2 bag inside cobra


Access port on cobra flanges


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


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


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

  • 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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