Rich2 Status

Stato del progetto RICH di
LHCb
CSN1
Napoli, 23 settembre 2005
M.Sannino
CSN1 Napoli 23/09/2005
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LHCb RICH detectors
RICH2:
17-100 GeV/c
No major changes
since RICH TDR
RICH1:
2-60 GeV/c
Major design changes
M.Sannino
CSN1 Napoli 23/09/2005
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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
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CSN1 Napoli 23/09/2005
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RICH 1 design and construction (2005)
RICH1 – Changes since RICH TDR
Aerogel
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 mirrors
Mirror supports outside acceptance
Eliminate entrance window by sealing
to VELO tank
TDR: 14% X0 
Now: 7.3% X0
 B Shielding, Gas Enclosure, Be Mirrors, Velo Seals PRR’s passed
 General assembly tests until Nov.2005
 Gas Enclosure install end 2005
 Beam pipe insertion Apr.2006
however severe delay on Be mirrors : final delivery end 2006
M.Sannino
CSN1 Napoli 23/09/2005
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AEROGEL
Tile
20.0 x 20.0 x 5.1 cm3
successfully produced in 2004 - 2005
M.Sannino
CSN1 Napoli 23/09/2005
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AEROGEL
Parameters
n=1.030
(± 0.001) at =400 nm
nominal size 20 x 20 x 5 cm
Clarity < 0.0064 m4 cm-1
(A, C, n, Dn)
Measured in Milano and Frascati
total dimensions : 720x600 cm to cover acceptance
Produced by Novisibirsk
T=Ae
(-C t / 4)
The aerogel box (1 of 2)
Interface to gas enclosure
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CSN1 Napoli 23/09/2005
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Aerogel Tiles: sequence of installation and final positioning
Order for the 2 boxes should go out in few days
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CSN1 Napoli 23/09/2005
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AEROGEL
production
5 tiles produced and delivered
C = 0.0054 m4/cm
1. n = 1,0291
20.0 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/cm
3.
n = 1,0308
C = 0.0062 m4/cm
4.
n = 1,0301
C = 0.0052 m4/cm
2.
Pre-serie
20.0 x 20.0 x 5.08 cm3
20.0 x 20.0 x 5.14 cm3
19.9 x 20.0 x 5.14 cm3
5.
n = 1,029
C = 0.0049 m4/cm
Delivered
June 2005
19.9 x 19.9 x 5.21 cm3
M.Sannino
CSN1 Napoli 23/09/2005
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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 later
PRR took place 31st may 2005 Referees very positive, production can go on
M.Sannino
CSN1 Napoli 23/09/2005
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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., , K/ separation, edge effects
with an array of pixel HPDs
C
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CSN1 Napoli 23/09/2005
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All systems foreseen








Rich2 Status
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 systems
Install fibres for the monitoring system
Install the quartz plates (are now ordered)
Install photon detector supports
Install 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
M.Sannino
CSN1 Napoli 23/09/2005
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Rich2 Mounted Superstructure with Windows, Side Walls and Photon Funnels
Photon Funnel
Entrance Window
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CSN1 Napoli 23/09/2005
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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
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CSN1 Napoli 23/09/2005
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Rich2 – Photodetectors Housing (Genova) (1)
M.Sannino
•
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
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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



Translator with ZIF Socket to HPD
Kapton Flexies
M.Sannino
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
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same type of installation with same components foreseen for Rich 1
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
M.Sannino
89.5
mm
Rich2 – Photodetectors Housing (Genova) (3)
CSN1 Napoli 23/09/2005
Cooling Details
Cooling Plates 16
Rich2 – Photodetectors Housing (Genova) (4)
COOLING PLATE PRODUCTION (July-Sep. ’05)
M.Sannino
CSN1 Napoli 23/09/2005
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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
M.Sannino
Si prevede prototipo pronto nel 10
trimestre 2006
CSN1 Napoli 23/09/2005
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HV BOARDS (Milano)
A
-20 kV
B
-19.7 kV
C
-16.4 kV
Half Column
Arrangement
A
5G
B
C
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CSN1 Napoli 23/09/2005
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LV Distribution (Milano)
LV_Board A
LV_Board B
LV_Board B
LV_Board B
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CSN1 Napoli 23/09/2005
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RICH 2 Status
magnetic 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
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)
Misure di campo
all’interno di una
matrice di schermi di
-metal in cui saranno
inseriti gli HPD
Campo z
Campo radiale (parallelamente)
12.0
1.5
1.0
10.0
10.0-12.0
8.0
8.0-10.0
Bz
1.0-1.5
0.5
6.0
4.0
2.0
0.0-0.5
-0.5
-0.5-0.0
6.0-8.0
Br -1.0
-1.0--0.5
4.0-6.0
-1.5
-1.5--1.0
2.0-4.0
-2.0
0.0-2.0
6
-2.5
z
0.9
1.8
r
2.7
2
0.9
r
1.8
2.7
-3.5--3.0
0
3.6
3.6
Campo assiale
M.Sannino
-3.0--2.5
z
0.0
0
-2.5--2.0
4
-3.5
2
0.0
-2.0--1.5
6
-3.0
4
0.0
0.5-1.0
0.0
Campo trasverso
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shield
at ground
Mumetal shield insulation (Milano)
reliable insulation stable as thin as possible for
close packing and optimal coverage over the
experiment lifetime needed
25 mm
Mumetal shield 760 micron thick
Polyester film 3x125 micron wrapped around
20kV operation
-20 kV
bulk discharges as well as
high surface currents, coronas,
have to be avoided
insulation
M.Sannino
CSN1 Napoli 23/09/2005
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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.
M.Sannino
CSN1 Napoli 23/09/2005
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HPD status
HPD 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.
M.Sannino
CSN1 Napoli 23/09/2005
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Spare Slides
M.Sannino
CSN1 Napoli 23/09/2005
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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
3.8
Do [mm]
3.3
2.8
2.3
1.8
1.3
Quality check for spherical mirrors produced
D0 = diam. of smallest circle containing 95%of reflected light
required D0  2.0 mm
M.Sannino
CSN1 Napoli 23/09/2005
0.8
8500
8550
8600
8650
8700
Radius of curvature [mm]
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RICH 2 Status
mirror alignment (surface,pit,data)
M.Sannino
CSN1 Napoli 23/09/2005
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Rich Photodetectors
bird’s eye view on some recent HPD performance measurements (1)
40 MHz prototypes
QE curves
Quantum Efficiency curves
30.00
25.00
QE [%]
20.00
HPD 3_7
HPD 2_2
HPD 2_10
Typ. specs
HPD 2_1
Min. specs
15.00
10.00
5.00
0.00
200
300
400
500
600
700
800
900
Wavelength [nm]
M.Sannino
CSN1 Napoli 23/09/2005
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M.Sannino
CSN1 Napoli 23/09/2005
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Rich Photodetectors
bird’s eye view on some recent HPD performance 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.)
M.Sannino
CSN1 Napoli 23/09/2005
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Rivelatori RICH di LHCb
Identificazione delle particelle su intervallo 1 – 100 GeV/c
mediante 2 rivelatori RICH
RICH1:
riprogettazione
completa come da nuovo TDR
LHcb light
EDR presentato il 31/8 /04
RICH2:
SOVRASTRUTTURA
Essenzialmente come da TDR
originario dei Rich
INSTALLAZIONE DEI
FOTORIVELATORI
modificata
M.Sannino
Causata da :
richieste per miglioramento
livello trigger L1
(  B  d = 0.15 Tm
nella regione di “tracking”)
Riduzione materiale nella
accettanza dello Spettrometro
Sovrastruttura costruita
Finestre di ingresso e uscita
installate
Photon Funnel installati
Specchi in Vetro installati
Beam Pipe installata
In attesa di essere calato in P8
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