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LUCID status. Outline: The Lucid detector Test performed The installation scenario The electronics Conclusions. M. Bruschi & A. Zoccoli for the Bologna Group. The LUCID detector. Fibres. Winston Cones. LUCID : “ LU minosity measurement using C erenkov I ntegrating D etector.

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LUCID status

  • Outline:

  • The Lucid detector

  • Test performed

  • The installation scenario

  • The electronics

  • Conclusions

M. Bruschi & A. Zoccoli

for the Bologna Group

Riunione CSN1 - Trieste


The LUCID detector

Fibres

Winston Cones

LUCID : “LUminosity measurement using Cerenkov Integrating Detector

Goals: - provide a relative luminosity measurement

(integrated and bunch by bunch);

- provide η-coverage for diffractive physics

Two detectors x 168 Al tubes filled with Isobutane at 1 or 2 Bar pressure

Winston cones at the end of the tubes bring the Cerenkov light onto quartz fibers.

Riunione CSN1 - Trieste


Activities of the Group since Feb.06

  • Main activities of the LUCID Group after the Test Beam 05 which provided a light yield of ~5 p.e. :

  • development and optimization of the Monte Carlocode to reproduce the detector performances.

  • Test on bench @ CERN and test beam @ DESY to check the detector performances and tune the MC.

  • Production of new improved detector parts (tubes, Winston cones, fibers).

  • Development of the electronics project

  • Discussion of the detector design and of the installation strategies

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Test on bench @ cern
Test on bench @ CERN

  • Tubes:

    • Mechanically polished

    • Electro-polished and mech. polished

    • Mylar liner

    • Old tubes (used in 2005 TB)

Goal of the measurements:

Understand the detector performances and check the improvements

on new parts.

Tested material:

  • Winston Cones:

    • Ø 4 mm and Ø 3 mm (new design)

    • Old cones Ø 3 mm (used in 2005 TB)

  • Fibers bundles:

    • PUV 500, 700, FSU 600

    • Old fibers HUV1000 (used in 2005 TB)

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Test on bench quantities studied
Test on bench: quantities studied

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Test bench results new tubes
Test Bench results: new tubes

Mylar tube

New tube

Old tube

Old tube

New tube

Aluminum tubes mechanically polished show a 10% improvement w.r.t old tubes. Close to the Mylar solution.

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Test beam @ desy
Test Beam @ DESY

Test beam performed on the 6 GeV electron beam @ DESY

in August 2006

Tested different detector configurations:

  • Old tube, old WC cone, old fiber bundle

  • New tubes, new WC cones, new fiber bundles

  • New tube, new WC cone coupled directly to a single PM a la CDF (backup solution for LUCID)

  • Exchanged the detector configurations in order to determine the improvements on the different parts.

    First results from the data analysis.

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Tb results fiber detector
TB results: fiber detector

Fit each single-channel spectrum: add the results or use calibrations and pedestals (from fits) to rescale each event and obtain the total distribution for each tube

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Tb results fiber detector ii
TB results: fiber detector II

Central fibers

~11.5 p.e.

Lateral fibers

Central fibers

Middle fibers

lateral fibers

~9.5 p.e.

Maximum light yield: ~10-12 p.e.

~ factor 2 improvement w.r.t. 2005

Little bit less than expected from test on bench.

Some more improvements needed (2 track resolution etc.)

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Tb results single pm

R2496

TB results: single PM

ADC spectra, with two peaks:

A) Cerenkov light only from gas

B) Cerenkov light from gas and PM quartz window

A

B

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TB results: single PM - II

Maximum light yield:

~60-85 p.e. in gas

~40 p.e. in quarzt w.

~100-125 p.e. in tot.

Close to the CLC (CDF) performances, with a non optimized system.

  • Solution appealing for the number of p.e., but need to verify:

  • Radiation hardness of complete PMT system.

  • Background Cerenkov light in the PMT window from primary & secondary particles.

  • PM activation, lifetime and Mechanical design.

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Conclusions on the TB results

Work to be done in the next few months:

  • optimization of the baseline solution to further improve performances. (produce new detector parts, test on bench etc.).

  • Careful verification of the feasibility of the backup option (background, rad. hard. tests etc.).

  • Radiation tests for the baseline (fiber, epoxy etc.) and for the backup solution (PMT, cables etc.) are needed now  Work is starting now!

  • Optimization of the Monte Carlo

  • Test Beam of the final detector before the installation

    (December 2006).

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Lucid detector deployment i
LUCID detector deployment-I

  • The proposed plan for a full LUCID deployment includes the installation of a subset of LUCID detector in 2007.

  • The LUCID group is aiming for a full installation of the LUCID in the first long shutdown after end 2007.

  • This reduced detector deployment in 2007, will be sufficient to allow the preliminary study of the following:

    • Backgrounds from secondary in the LUCID detector;

    • Beam related backgrounds;

    • Timing;

    • The front-end and backend readout electronics;

    • The installation and alignment of the LUCID detector;

    • The gas supply system;

    • The effect of heat from the bake-out jacket on the LUCID detector

    • First luminosity measurements.

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Baseline fibre-optic readout

Single PMT

LUCID detector deployment-II

  • The reduced detector deployment will include the complete LUCID pressure vessel, alignment system and gas system.

  • We plan to readout only ~10 tubes/end. Most of the channels will be readout via fused-silica fibres to remote MaPMTs .

  • The FE readout will be placed in the vicinity of the MaPMTs - the resulting signals will be driven to the BE readout in USA15. We expect to use an initial version of the final LUCID electronics.

  • A few channels will be equipped with asinglePMT placed on Winston Cone ends. These PMTs will be readout, via an amplification stage, in USA15, for timing and light collection studies.

  • The full LUCID detector will be installed during the first long shut-down.

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The LUCID readout

Placing MaPMTs

Readout paths

  • Baseline:

    • MaPMTs placed in the shielding

    • MAROC chip placed by the MaPMTs

    • Drivers boost signal out

    • Cables go direct to USA15 980 100M)

  • Radiation level in the vicinity of the MaPMTs is 35 Grays/Yr

Cable lengths

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The lucid fed cards
The LUCID FED cards

RX Digital Board

TTCRQ, ELMB128A,volt. reg.

MAROC Boards

TX Digital Board

GOL, FPGA, TX

Connectors

Board

(HV,LV,RX,

TX, analog)

Base board

(connectors,signals routing,

MAROC prog.FPGA )

ANALOG board

(ampl.+line driv.)

The front end system is now modular so allowing scalability

The MAROC Board and part of the ANALOG board has been developed by LUND (thanks!)

Riunione CSN1 - Trieste


The FED (digital part)

  • The TX digital board designed is in production

  • The other two cards (RX, Connectors) have been mostly defined (6 more weeks work)

  • In order to define the Base Board we need to fix the MAROC I/O (B.L.)

  • All the components (electronics, connectors –except HV) have been defined

  • A prototype of the front end card (MAROC) should be ready toward the middle/end of November

Riunione CSN1 - Trieste


Electronics/ The analog test board

  • The analog test board has been designed with the aim to provide the possibility to test the analog part of the MAROC chip based front end cards

  • It will allow to test also single anode PMT based readout scheme

  • It is meant to be an important tool that should allow us to understand the detector even in case of delay in the production of a prototype for the MAROC chip based front end cards by using commercially available VME modules for the DAQ

  • All its parts already in production/ prototype should be ready beginning of October

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Electronics the analog test board
Electronics/ The Analog Test Board

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Conclusions -I

  • New detector parts (tubes, cones, fibres) have been produced and tested on bench and at the DESY test beam in August 2006.

  • The TB results indicate factor of ~2 improvements over last test beam. Some more improvements are expected in the next detector version

  • A test beam on the final detector will be performed in December 2006.

  • Radiation hardness studies on single PMT and fiber bundles are starting now.

  • New installation scheme for LUCID has been studied. Partial detector deployment foreseen in 2007

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Conclusions ii
Conclusions-II

  • MAROC2 chip including modifications for LUCID delivered on July. First tests look promising.

  • The design of the front-end electronics is started and it is on track (although we still need a confirmation of the performances of the detector)

  • The most important part of the FED is already under production

  • The Analog Test Board (Backup solution for tests but also for the 2007 installation) is in advanced status of production (prototype expected for beginning of next October)

  • The project is now modular. Moreover, it can be easily adapted in case we will decide for the LUCID readout backup solution

  • The development of the readout and trigger electronics could be a bit relaxed since we can use already available pieces of DAQ to give a luminosity measurement as soon as the front end electronics will be available

Riunione CSN1 - Trieste


Backup slides
Backup slides

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Lucid position

MBTS

TILE

LUCID position

Front face of LUCID end is ~17m from the IP. Projective geometry.

Acceptance covered 5.4 <|η|< 6.1

LUCID region 6-7 Mrad/year at 1034 cm-2s-1

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Lucid position 2
LUCID position (2)

  • Planned installation after the Big Wheels A/C.

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Backup solution under study

Baseline fibre-optic readout

Miniature PMT

Backup solution (under study)

PMT

  • Place single miniature PMTs directly onto the end of each Winston cone?

  • Advantages:

    • More light because of direct coupling

    • Lower electronics cost

    • Swap quartz fibres for (cheaper) signal cables

  • Need to study:

    • Radiation hardness of complete PMT system

    • Background Cerenkov light in window from primary & secondary particles

    • Activation

    • Mechanical design

       First check @ the DESY Test Beam

HAMAMATSU R2496

Riunione CSN1 - Trieste


Richieste finanziarie 2007
Richieste finanziarie 2007

Gruppo BO-Lumi: 16.6 FTE + 0.85 Tecnol.= 17.5 FTE

Missioni interne:

- metabolismo 17.5 k€

Missioni estero:

- metabolismo (17.5 FTE x 1.5MU x 4.4k€) 115.5 k€

- C&I (6 mesi x 3 FTE x 4.4 k€) 79.2 k€

- Presa dati (3mesi x 2FTE x 4.4 k€) 26.4 k€

Consumo:

- metabolismo 26.0 k€

Inventario:

- 2 postazioni di lavoro 4.0 k€

Costruzioni apparato:

- (vedi trasparenza successiva) 45.0 k€

Riunione CSN1 - Trieste


Richieste costr apparati 2007
Richieste costr. Apparati 2007

Riunione CSN1 - Trieste


Test bench results old test beam parts
Test Bench results: old test beam parts

Good understanding of the detector performances.

Riunione CSN1 - Trieste


Expected improvements
Expected improvements

Expected improvements in light yield based on test bench results:

  • Tubes: improvements in the internal surface (~ 1.1)

  • Winston cone: new design + internal surface (~ 1.4 - 3)

  • Fibers: improve fiber quality. Less attenuation (at 300 nm), Larger angular acceptance and larger (core)/(clad) area ratio (0.78 compared to 0.68) plus enlarge the light spectrum sensitivity ( ~1.6)

     Expected improvements in light collection: factor ~2 – 4

    Next steps:

  • Test beam @ DESY from the 31st of July until the 12th of August to test the new detector performances

  • Further detector optimizations

  • Test beam @ CERN in November to test the final detector

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FED MAROC

PMF

ANALOG

CARD

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