M.SanninoCSN1 Assisi 22/09/20041 Stato del progetto RICH di LHCb CSN1 Assisi, 22 settembre 2004.

M.Sannino CSN1 Assisi 22/09/2004 1

Stato del progetto RICH di LHCbCSN1

Assisi, 22 settembre 2004


RICH2: SOVRASTRUTTURA Essenzialmente come da TDR originario dei Rich

INSTALLAZIONE DEI FOTORIVELATORI modificata

Rivelatori RICH di LHCb

RICH1: riprogettazione completa come da nuovo TDR LHcb light

EDR presentato il 31/8 u.s.

Sovrastruttura costruita Finestre di ingresso e uscitainstallatePhoton Funnel installatiSpecchi in Vetro (Pyrex / Simax) in corso di fabbricazioneBeam Pipe installata

Identificazione delle particelle su intervallo 1 – 100 GeV/c

mediante 2 rivelatori RICHCausata da :richieste per miglioramento livello trigger L1

( = 0.15 Tm nella regione di “tracking”)

Riduzione materiale nella accettanza dello Spettrometro

dB


LHCb RICH system in cavern


Impegni italiani nei RICH

Genova : Rich2 alloggiamento fotorivelatori (inclusa trasmissione segnali a L0 e raffreddamento design e componenti in parte utilizzati anche per Rich1) ECS Alte Tensioni

Milano: Rich1

Aerogel e relativi telai per l’installazione Rich2

schermo magnetico consegna al CERN ottobre 2004

ottica (test, allineamento) schede distribuzione alta e bassa tensione


Overview of RICH1 – Changes since RICH TDR

1. Addition of Plane Mirrors to allow HPDs to be located

where iron shields can be used

2. Vertical optical layout to allow shields to act as pole pieces for Level-1 trigger field

3. Reduction of material in LHCb acceptanceBeryllium spherical mirrorsMirror supports outside acceptanceEliminate entrance window by sealing to VELO tank

TDR: 14% X0 Now: 7.3% X0


RICH1 Mechanical Design - Overview

Beryllium spherical mirrors

Quartz windows

Seal directly to the VELO exit window

Glass secondary plane mirrors (outside the acceptance)

Magnetic shields (each ~8 tonnes of

“Armco” iron)

7x14 HPD arrays

Exit windowseals tobeampipe


target

Max Field at HPD Plane 25G

Integral Field to 250cm 150kGcm

Rich1 Magnetic shield performance

The addition of iron blocks close to the magnet allows field to be channelled to the upstream wall of the shield where it increases the field required by the trigger


Support

Rich1 Beryllium Mirrors –Design and FEA

The mirrors and a support structure on one edge can be cut from a single piece of beryllium.

A full-sized mirror segment has now been ordered from Kompozit (Russia).

The use of beryllium mirrors (along with the beam-pipe) has safety implications for LHCb which are regulated by CERN safety instruction IS No. 25


Rich1 Plane Glass Mirrors 370mm x 387mm

Plane mirrorsOutside trackeracceptance

The 16 plane glass mirrors use

the same technology as

RICH2 plane mirrors

.


Rich1 HPD assembly

HPD + Mumetal + ZIF connector

RICH2 assemblyaccommodated in RICH1shield box

Cooling: C6F12 system

1.5kW per box !!

Common design with RICH2


Rich1 Aerogel

In October 2003 aerogel samples were exposed in a 10Gev/C beam and the Cherenkov rings measured using 3HPDs.

The results shown here are for a tile with:- Thickness = 4.4cm Refractive Index = 1.0280 Clarity(C)= 0.0052 m4/c A = 86%

Weight = 60.6g

Measurement of ring segments on the 3 HPDs shows that ~13 photo-electrons per ring would be detected (at 100% acceptance). This is better performance than assumed in the TDR.


APACHE

The sample is exposed to a 500 MeV electron beam at the BTF in Frascati. The Cherenkov photons are collected on a photographic film.The film is then developed and scanned for the analysis, which consists in retrackingthe hits from the film to the beam axis via the mirror.For each run, the peak value of the Cherenkov angle distribution is plotted.

Aerogel Photographic Analysis by CHerenkov Effector how to measure n homogeneity inside a tile

The vessel

Result for the measured tile: within specsσn = 1.14 mrad ( spec. < 1.17 mrad)

Rich1 AerogelRich1 Aerogel


Rich1 Aerogel

Preseries production : 6 liters in 3 tiles 20x20x5 cm3

delivered end June ’04refractive index: 1.0305, 1.0309,

1.0316,clarity : 0.0054, 0.0056,

0.0062 m

Final contract in preparation (2 preserie tiles can be regarded as final )

20 l should be produced by end 2004- beginning 2005


Rich2 Status

Almost completely assembled•Entrance Window installed•Exit Window installed•Side walls and top covers installed•Photon Funnels installed•Spherical Mirrors Plates installed•Beam Pipe just installed last week•Quartz Windows installed

Still to be done•A complete gas leak test is going to be performed •After that the magnetic shielding will be installed followed by the• optical setup•In the period mid-December mid-March 2005 all the mirrors• (spherical and flat) will be installed•Rich2 foreseen to be ready for transport to the pit on 20/04/2005

Superstructure


Rich2 Mounted Superstructure with Windows, Side Walls and Photon Funnels

Entrance Window

Photon Funnel


0.8

1.3

1.8

2.3

2.8

3.3

3.8

8500 8550 8600 8650 8700

Radius of curvature [mm]

Do

[mm

]

Rich2 Status - Mirrors

Mirrors in Simax Glass manufactured by the Compass - Czech Firm

Spherical Mirrors: array of hexagonal mirrors dcirc = 510 mm subs. thick’ss = 6 mm R0 = 8600 mm 0.5%

Flat Mirrors: array of flat mirrors (R=~50 m) rectangular in shape dcirc = 559 mm

At present•~ 45 good hexagonal mirrors available now: complete!

Quality check for spherical mirrors producedD0 = diam. of smallest circle containing 95%of reflected lightrequired D0 2.0 mm


Rich2 Status Photodetectors Housing

• Photodetectors housing completely redesigned since Jan. 2004 due to much larger heat dissipation requirements than initially foreseen : each HPD plane 2kW instead than ~200 W foreseen in the EDR due to much larger dissipation both of pixel chip (~1.8 W/chip) and associated L0 electronics.

• To ease cooling electronics PCB’s (L0, HV, LV) are arranged on the same plane differently from the old design, while the general frame design is retained with proper modifications in order to accommodate the electronic boards.

• In new design Cu cooling plates with active C6F12 system in order to cool L0 electronics.

• Precision positioning of HPD’s and cooling of pixel chips implemented by means of special mounting cup (spacer) together with cold fingers conducting heat to cooled frames where cooling plates are installed.

• HPD signal pinout inserted into a ZIF connector mounted on a special PCB (translator) in turn connected to L0 electronics by means of a couple of Flexible (Kapton) Printed Circuits. Proper termination resistors are implemented on the translator PCB


New HPD Columns LayoutGENERAL ARRANGEMENT

Cooling Plates

Prototype HV Board


New HPD Column Layout COLUMN FRAME PROTOTYPE WITH ELECTRONIC BOARDS

• MANUFACTURING ONGOING, DELIVERY EXPECTED BY MID SEPTEMBER


New HPD Column Layout COOLING PLATE PROTOTYPE

•3 COOLING PLATES FORESEEN FOR THE TEST BEAM COMPLETELY ASSEMBLED (THANKS TO E. ALBRECHT) AND AVAILABLE AT CERN


New HPD Column Layout Translator Module and Spacer

The Translator Module is the complex of a PCB together with flexible links, accomplishing the task of connecting the HPD to the L0 Board still allowing for mechanical freedom

(Spacer)

The Spacer is a new component needed for the HPD alignment with the higher heat dissipation


Rich PhotodetectorsRich Photodetectors bird’s eye view on some recent HPD performance bird’s eye view on some recent HPD performance

measurements (1)measurements (1)

Quantum Efficiency curves

0.00

5.00

10.00

15.00

20.00

25.00

30.00

200 300 400 500 600 700 800 900

Wavelength [nm]

QE

[%

]

HPD 3_7

HPD 2_2

HPD 2_10

Typ. specs

HPD 2_1

Min. specs

40 MHz prototypes

QE curves


Rich PhotodetectorsRich Photodetectors bird’s eye view on some recent HPD performance bird’s eye view on some recent HPD performance

measurements (2)measurements (2)

Efficiency Measurements Timing scans (e.g. timewalk effects for different strobes (25/50 ns) Comparisons between detection efficiencies 25 and 50 ns strobes Detection efficiencies for different cathode HV’s

Reflection Measurements light reflection in quartz window light reflection on internal HPD structure (silicon, electrodes,etc.)


Rich 2004 test beam• Rich prototype foreseen to be tested on the beam in 2 periods (1st week

October – 2nd week November). The 1st period will be a setup period• Special test vessel will accommodate 3 HPD columns which will be an

exact prototype of the definitive installation, including the cooling system, in order to perform a complete working test of the HPD system


Rich PhotodetectorsRich PhotodetectorsHPD pre-series news and availabilities for 2004 test HPD pre-series news and availabilities for 2004 test

beambeam

• Latest update from DEP as of 31Latest update from DEP as of 31stst August 2004 August 2004:

““The situation with respect to the production of the pre-series will The situation with respect to the production of the pre-series will expectedly be as follows:expectedly be as follows:

* We do have one completed HPD, potted in the LHCb construction, but * We do have one completed HPD, potted in the LHCb construction, but still with the "old" Quartz input window ("old” way of marking) and old still with the "old" Quartz input window ("old” way of marking) and old wiring. The completed HPD still has to be tested.wiring. The completed HPD still has to be tested.

* We will start with the processing of the second HPD (using anode 4.1) * We will start with the processing of the second HPD (using anode 4.1) by 1by 1stst September. September.

* The next 5 starts (using anodes 2.6, 2.7, 3.1, 3.2 and 4.2) are * The next 5 starts (using anodes 2.6, 2.7, 3.1, 3.2 and 4.2) are foreseen for the weeks 38, 39 and 40 (13 September till 1 October). Next foreseen for the weeks 38, 39 and 40 (13 September till 1 October). Next week we cannot make any further starts because of the lack of Quartz week we cannot make any further starts because of the lack of Quartz windows.windows.

* Remaining starts related to the availability of anodes: depends on * Remaining starts related to the availability of anodes: depends on approval of remaining 3 anodes […]. With the approved anodes the approval of remaining 3 anodes […]. With the approved anodes the remaining starts will be made in the first week of October.”remaining starts will be made in the first week of October.”

In conclusion HPD availabilities should be:In conclusion HPD availabilities should be:

2 HPD’s for October test beam week2 HPD’s for October test beam week

10 HPD’s for November test beam week10 HPD’s for November test beam week


Spare Slides


Rich2 Schedule


Rich1 Schedule


Rich2 Superstructure with Exit Window Mounted


Cooling Plates


TEST BEAM HARDWARE PRODUCTION: HPD SPACER

• 20 ITEMS MANUFACTURED, DELIVERED AND ACCEPTED• PARTS ARE AVAILABLE AT INFN-GE• COOLING FINGER DETAILS ARE UNDER MANUFACTURING AND WILL BE AVAILABLE BY THE END OF THIS WEEK


Flexible Links

Translatorand

Flexible Links

Translator and Flexible LinksTest Set-up

Hirose Connector

ZIF HPD Connector

Translator Module Prototype


Translator Module - PCB Layout

•On one side of the PCB a modified 321 pin Socket 7 ZIF Connector is mounted where pins of the HPD ceramic PGA are inserted. On this side a PT1000 Temperature Sensor is mounted too•On the other side of the PCB there are two Hirose FH12-50S-0.5SV connectors where the flexible links are inserted and also the terminating resistors of the lines going from L0 board to HPD•On both sides of the PCB ceramic filtering capacitors for power supplies and references are mounted

PCB dim.81.5 x 55 x 1.6 mm3

Total thickness14.4 mm (ZIF conn. incl.)

Central hole for HPD cooling by means of a cold finger


Translator Module - Flexible links

Flexible links carry the signals between HPD and L0 board: ~ 88 mm long 2-layer configuration 1st side :Analog, Digital and Power Lines 2nd side :Grounds (A & D in corresp. to respective Lines) Each Line: 6 mil wide, ~35 mm thick, R ~ 0.2 Ohm, Z ~ 82 Ohm


Overview of RICH1 – Optical Layout


Rich1 Magnetic Shield – vertical

extension

Space available for HPDs and readout electronicsIs limited

Extending vertically by 200mmAllows accommodation of RICH2 HPD assembly


Rich1: Material Budget

Item % X0 % I

Entrance window 0.0 0.0Aerogel 3.3 0.7C4F10 2.6 1.6Spherical mirror 0.8 0.7Exit window 0.6 0.3

Total 7.3% 14% in TDR design

3.3% 5% in TDR design


Rich1 Mirrors • Spherical mirrors

– 82 cm x 60 cm, R=240 cm: 1 per quadrantas a final technology Beryllium has been chosen(Carbon fiber was another possible candidate)

Be: 3 mm thick, with 0.3 mm glass coating• ¼-scale prototpye satisfies optical quality• Compatible with flurocarbon gas• Higher cost than carbon fibre

• Secondary plane mirrors (outside acceptance)– 37 cm x 39 cm: 4 per quadrant– Glass: 6 mm thick


HPDHPD


Shielded Phosphor tube:TRANSVERSE field 30G

• Reference B=0G

SHIELDED: Bt=30G

Maximum displacement < 350m (0.7pixels)


Shielded Phosphor tube: AXIAL field 30G

• Reference B=0G

SHIELDED: Bz=30G

0% coverage loss

Max displacement ~ 2.8mm


HPD and Phosphor Tube: transverse B field

•HPD reference B=0G

HPD Bt=2.5G

*Phosphor tube Bt=2.5G

mm

mm

Confirm the two devices have same electron optics behaviour


HV board layout

To avoid discharges from the HV, three circuit solutions have been adopted:1. The boards and the critical components are covered by a transparent, protective material (Flexible rubber) having an

electrical strength of about 20 KV/mm;

2. To suppress any possible effect that can arise from a non perfect adhesion of the protective material on the surface of the PC board, apertures has been created around the critical connecting points;

3. A 4 layer PCB has been designed that allows the track to stay buried by about 0.8 mm of fiberglass, having a strength of about 50 KV/mm.

Here we have a laboratory prototype on a 2 layer PCB. The protective material is completely transparent and cover the whole board.

This is a Board 1 type. The HV resistors are not present, while the HV filtering capacitance are mounted.

In the test we have done, the HPD where simulated connected to GND, as a very fault situation.

HPD

Board 2

1 G HVHV 1

1 G HVHV 2

1 G HVHV 3

10 G HV

10 G HV

10 G HV

Monitor 1

Monitor 2

Monitor 3

X 2

HPD

Board 2

1 G HVHV 1 1 G HVHV 1 1 G HVHV 1



10 G HV

10 G HV

10 G HV

Monitor 1

Monitor 2

Monitor 3

X 2

Two different circuit configurations, namely two boards, has been built. Each board manages two HPD:

HV splitter and filtering capacitances:

Voltage monitoring:

HPD

1 G HVHV 1

1 G HVHV 2

1 G HVHV 3

Board 1

X 2

20KV

HPD

1 G HVHV 1

1 G HVHV 2

1 G HVHV 3

Board 1

X 2

20KV


Work in Progress

1. The protective material is available;

2. The HV filtering capacitance are available;

1. HV dividers;

2. HV 1 G Resistors;

3. HV wires

Not yet available, but ordered from CERN and under delivering:

The whole HV boards setup should be ready by the end of September if the HV dividers, resistors and wires will be available within, at most, the first half of September.

PROTOTYPE BOARDS PROTOTYPE BOARDS AVAILABLEAVAILABLE

Leakage current at 22 KV of the lab. prototype in free air in more than 8 days (spikes are ambient disturbances).

Board 1

Board 2

M.SanninoCSN1 Assisi 22/09/20041 Stato del progetto RICH di LHCb CSN1 Assisi, 22 settembre 2004.

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Transcript of M.SanninoCSN1 Assisi 22/09/20041 Stato del progetto RICH di LHCb CSN1 Assisi, 22 settembre 2004.