Stato del progetto RICH di LHCb

M.Sannino CSN1 Napoli 23/09/2005 1

Stato del progetto RICH di LHCbCSN1

Napoli, 23 settembre 2005


LHCb RICH detectors

RICH1:2-60 GeV/cMajor design changes

RICH2:17-100 GeV/c No major changes since RICH TDR


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

Elettronica : HV distribution boards LV distribution boards Isolamento elettrico mumetal Schermo magnetico complessivo


RICH 1 design and construction (2005)

Aerogel

B Shielding, Gas Enclosure, Be Mirrors, Velo Seals B Shielding, Gas Enclosure, Be Mirrors, Velo Seals PRR’s passedPRR’s passed

General assembly tests until Nov.2005General assembly tests until Nov.2005 Gas Enclosure install end 2005Gas Enclosure install end 2005 Beam pipe insertion Apr.2006 Beam pipe insertion Apr.2006

however severe delay on Be mirrors :severe delay on Be mirrors : final delivery end 2006

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 acceptance

Beryllium spherical mirrorsMirror supports outside acceptanceEliminate entrance window by sealing to VELO tank

TDR: 14% X0 Now: 7.3% X0

RICH1 – Changes since RICH TDR


AEROGEL

Tile20.0 x 20.0 x 5.1 cm3

successfully produced in 2004 - 2005


n=1.030 (± 0.001) at =400 nm

nominal size 20 x 20 x 5 cm

Clarity < 0.0064 m4 cm-1

total dimensions : 720x600 cm to cover acceptance

Produced by Novisibirsk T = A e (-C t /4)

The aerogel box (1 of 2)Interface to gas enclosure

AEROGEL

(A, C, n, Dn)Measured in Milano and Frascati

Parameters


Aerogel Tiles: sequence of installation and final positioningAerogel Tiles: sequence of installation and final positioning

Order for the 2 boxes should go out in few days


5 tiles produced and delivered

n = 1,0291 C = 0.0054 m4/cm20.0 x 20.0 x 5.13 cm3

meas. In Milano: C = 0.0052±0.00007 A = .96 n(543nm) = 1,0288 ±0.00027

n = 1,0301 C = 0.0056 m4/cm20.0 x 20.0 x 5.08 cm3

n = 1,0308 C = 0.0062 m4/cm20.0 x 20.0 x 5.14 cm3

n = 1,0301 C = 0.0052 m4/cm19.9 x 20.0 x 5.14 cm3

n = 1,029 C = 0.0049 m4/cm19.9 x 19.9 x 5.21 cm3

AEROGEL production

1.

Delivered June 2005

Pre-serie

2.

3.

4.

5.


Plans for production

Total amount needed: 23 liters 6 tiles 20x20 cm 8 tiles variable size

Pre-series production : 6 liters (3 tiles 20x20x5 cm3) july 2004 all within specifications OK Final production : 4 liters received 13 liters 30 september 2005 (on schedule) 6 liters (spare) 31 december 2005 or laterPRR took place 31st may 2005 Referees very positive, production can

go on


Plans for measurements

For each tile : measurement of n (with spectrometer method, and from density) n across the tile with laser beam method (in lab) measurement of T with spectrophotometer (to determine Clarity factor) to prepare a database for the description of the detector

For one or two tiles in 2006 (requested): test beam measurement of n, Np.e.,C

, K/ separation, edge effects

with an array of pixel HPDs


Rich2 StatusAll systems foreseen Super Structure Windows Central Tube Overall Magnetic Shielding Mirror Panels Spherical Mirrors Flat Mirrors Monitoring Systems

are installed and, wherever applicable, aligned.RICH 2 has been leak tested. Leak rate is in the very good range of < 5 l/h

To be done in the pit:Align RICH 2 on the bunker

Check alignment of the optical systemsInstall fibres for the monitoring systemInstall the quartz plates (are now ordered)Install photon detector supportsInstall back planes and patch panels

Rich2 is still not in the pit due to a delay in LHC installations and should be transported in the 1st half of october


Rich2 Mounted Superstructure with Windows, Side Walls and Photon Funnels

Entrance Window

Photon Funnel


Rich2 Status Photodetectors Housing (Genova)

• 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


Rich2 – Photodetectors Housing (Genova) (1)

• EVERY DETECTOR PANEL IS MADE OF AN ARRAY OF HPD COLUMNS

• AN EXTERNAL FRAME HOUSES 9 COLUMNS

• EVERY COLUMN IS AN INDEPENDENT SUB-ASSEMBLY, THAT CAN BE INTRODUCED AND REMOVED WITHOUT AFFECTING THE NEIGHBOURING COLUMNS

• THE PANEL FEATURES X/Y/Z (+/- 2 mm) AS WELL AS ROLL AND PITCH ADJUSTEMENTS

1. RAILS ARE FITTED ON MAGNETIC SHIELD BASE, TO LET THE SHIELD SLIDE INTO POSITION AND ALLOW LONGITUDINAL ADJUSTMENT

2. PANEL BASE FEATURES LEVELLING SCREWS, TO ADJUST HEIGHT, ROLL AND PITCH

3. PANEL BASE FEATURES ALSO TRANSVERSE RAILS TO ADJUST TRANSVERSE POSITION


Rich2 – Photodetectors Housing (Genova) (2)• EVERY COLUMN HOUSES 16 HPDs

• EVERY HPD ASSEMBLY (HPD TUBE + MU-METAL SHIELD) IS INTEGRATED ON A SPACER. AN INTERFACE MODULE WITH KAPTON PIGTAILS CONNECTS THE TUBE TO L0 BOARD

• A COOLING PLATE IS FITTED ON ONE SIDE OF THE COLUMN

• L0, LV AND HV BOARDS ARE ARRANGED “IN-LINE” BEHIND HPD ASSEMBLIES

Mechanical Construction in well advanced state

Mechanical components mostly built by INFN Genova Workshop (apart from some series production highly repetitive items)

Complete mechanical assembling test foreseen in Genoa in the next 2 weeks before shipment to CERN

Translator with ZIF Socket to HPD

Kapton Flexies

same type of installation with same components foreseen for Rich 1same type of installation with same components foreseen for Rich 1


89.5

m

m

89.5

mm

Rich2 – Photodetectors Housing (Genova) (3)

1. HPD PITCH INCREASED FROM 87 TO 89.5 mm (ACCURACY ISSUES)

2. HPD SPACER OUT OF ALUMINIUM, INSTEAD OF GF NYLON (COOLING ISSUES)

3. KAPTONS TO LINK HPD TO L0 BOARD, INSTEAD OF FLAT TWISTED PAIR

4. COOLING FINGER ON HPD SPACER TO DIRECTLY COOL HPD CARRIER (OPTION), INSTEAD OF NATURAL AIR DRAFT

5. SIMPLIFIED SUPPORTING FRAME ASSEMBLY: ONLY ONE FRAME

6. A COOLING PLATE HAS BEEN ADDED, TO DIRECTLY COOL THE ELECTRONICS

7. ALL THE SERVICES (EXCEPT COOLANT FEED) ACCESS THE DETECTOR PLANE FROM THE TOP

8. “IN-LINE” ARRANGEMENT OF THE BOARDS

Cooling Plates

Cooling Details


COOLING PLATE PRODUCTION (July-Sep. ’05)Rich2 – Photodetectors Housing (Genova) (4)


ECS Alte Tensioni (Genova)

Sistema alimentazione alte tensioni HPD realizzato mediante alimentatori ISEG (1 per colonna) a 20kV

Comando e monitoraggio alimentatori ISEG realizzato mediante segnali analogici BT (0-5V)

Necessaria realizzazione interfacciamento con bus previsti dal sistema ECS

Interfacciamento a ECS realizzato mediante linea Ethernet e tecnologia CC-PC Glue-Card sviluppata a Genova per tutto LHCb

In corso di prototipazione scheda madre con CC-PC/Glue-Card interfacciata a schede figlie con convertitori A/D e D/A mediante bus I2C

Si prevede prototipo pronto nel 10 trimestre 2006


HV BOARDS (Milano)

-20 kV

-19.7 kV

-16.4 kV

A

B

C

A

B

C

5G

Half Column

Arrangement


LV Distribution (Milano)

LV_Board A

LV_Board B

LV_Board B

LV_Board B

M.Sannino

RICH 2 Statusmagnetic shield and measurement

(Milano)

Magnetic shield tested with LHCb magnet

Magnetic field (gauss) measured at HPD focal plane


Schermo magnetico HPD (Milano)Matrice di schermi

0.0 0.9 1.8 2.7 3.60

2

4

6

0.0

2.0

4.0

6.0

8.0

10.0

12.0

Bz

r

z

Campo z

10.0-12.0

8.0-10.0

6.0-8.0

4.0-6.0

2.0-4.0

0.0-2.0

0.0 0.9 1.8 2.7 3.60

2

4

6

-3.5

-3.0

-2.5

-2.0

-1.5

-1.0

-0.5

0.0

0.5

1.0

1.5

Br

r

z

Campo radiale (parallelamente)

1.0-1.5

0.5-1.0

0.0-0.5

-0.5-0.0

-1.0--0.5

-1.5--1.0

-2.0--1.5

-2.5--2.0

-3.0--2.5

-3.5--3.0

Campo assiale

Campo trasverso

Misure di campo all’interno di una

matrice di schermi di -metal in cui

saranno inseriti gli HPD

Campo magnetico generato da

opportune bobine di Helmholz in modo da

simulare il campo magnetico all’interno

degli schermi magnetici

complessivi del Rich2 (V. trasp.

precedente)


-20 kV

shield at ground

25

mm

insulation

reliable insulation stable as thin as possible for close packing and optimal coverage over the experiment lifetime needed

bulk discharges as well as high surface currents, coronas,

have to be avoided

Mumetal shield insulation (Milano)

Mumetal shield 760 micron thickPolyester film 3x125 micron wrapped

around20kV operation


HV Scheduling

• Before end of October 2005: final prototypes for PRR and December/January system test/ beam test;

• Spring 2006: full board production (at least for RICH2). The assembling and test will start and follow.

LV Distribution Scheduling

September 2005: finish testing of the last prototype at CERN.

October-November 2005: production of two columns of the final version of LV distribution for Test beam/full column test foreseen at the end of the year.

Spring 2006: full board production. The assembling and test will follow.


HPD statusHPD production (DEP) 550 tubes (484 + spares) required + 50 optional tubes Contract signed for 485 tubes only + additional option

HPD production status• HPD production is recently underway• 8 tubes delivered on 30th June; QE values within specification• Another 7 tubes to be delivered this week to CERN• All subsequent tubes to be delivered to Edinburgh/ Glasgow

Anode assemblies DEP now have ~100 anode assemblies to work with Further 120 anode parts sent to HCM this week for packaging Gold plating problems @CERN solved – but incurred 2 months

delay

Bump-bonding Two batches (200 + 300) assemblies received from VTT ~80% yield VTT (final) batch 3 (300 assemblies) by end of this year

Next batch of HPDs (7) to be sent to CERN. The next batch (initially ~ 6-7) of tubes sent to test stations end September.


Spare Slides


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

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


RICH 2 Status mirror alignment (surface,pit,data)


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.)


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 /04

Sovrastruttura costruita Finestre di ingresso e uscitainstallatePhoton Funnel installatiSpecchi in Vetro installatiBeam 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

In attesa di essere calato in P8

Documents

Stato del progetto RICH di LHCb