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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

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

Lucid status

The LUCID detector


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.

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Lucid status

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


TB results: single PM

ADC spectra, with two peaks:

A) Cerenkov light only from gas

B) Cerenkov light from gas and PM quartz window



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Lucid status

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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Lucid status

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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Lucid status

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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Lucid status

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





TX, analog)

Base board

(connectors,signals routing,


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!)

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Lucid status

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

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Lucid status

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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Lucid status

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

  • 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

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Backup slides
Backup slides

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Lucid position



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)


  • 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


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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€


- metabolismo 26.0 k€


- 2 postazioni di lavoro 4.0 k€

Costruzioni apparato:

- (vedi trasparenza successiva) 45.0 k€

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Richieste costr apparati 2007
Richieste costr. Apparati 2007

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

Good understanding of the detector performances.

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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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Lucid status





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