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RICH STATUS REPORT

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Vibration test of the LOWER TOF System. ... Visual inspection before vibration. AMS TIM July, 2006 - CERN. RICH Status Report ... – PowerPoint PPT presentation

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Title: RICH STATUS REPORT

1
RICH STATUS REPORT
Javier Berdugo CIEMAT-Madrid
AMS RICH Collaboration CIEMAT (Madrid-Spain)
IAC (Canary Islands-Spain) INFN
(Bologna-Italy) LIP (Lisbon-Portugal) LPSC
(Grenoble-France) UMD (Maryland-USA) UNAM
(Mexico-Maxico)
2
AMS RICH

Precise measurement of the velocity of charged
particles
Measurement of the charge of the particles

Charge Z Velocity ?
Particle
CerenkovRadiator
CERENKOV LIGHT
Conical Reflector
Photo- detectors

Photon Detection
10880 cells (680 PMTs 4x4)
Hamamatsu PMT-7600-00-M16
Gain 106 _at_ 800 V
Quantum Efficiency ? 20 in the range 250-600 nm

Conical Reflector
Multilayer Structure on a Carbon Fiber Reinforced
Composite (CFRC) Substrate

Cerenkov Radiator
3 cm of Aerogel (n ? 1.05)
5 mm of NaF (n ? 1.33)
Np.e. ? 10 (for Z1 ?1)
?thershold ? 0.751

3
RICH Status Report Outline

Radiator Container
Vibration Test Preparation
Detection Plane
Grid assembly
Functional Test
Electronics
DC/DC Production and acceptance test

4
Radiator Container Elements
5
Radiator Container Sealing

Aerogel and NaF require a controlled dry
enviroment
Container is filled with neutral gas whenever not
in dry atmosphere
Container is sealed and must compensate
atmospheric preasure variations
Launch/landing venting capability

6
Radiator Container outlet system
venting valve Halkey Roberts C 770RP
Interface block (Peek)
50 mm filter (stainless steel)
7
Radiator Container Expandable reservoirs
The Aerogel container is sealed. 2
TEDLAR/TEFLON bags (0.6 L each ) are used to
compensate atmospheric pressure variations before
launch.
8
Radiator Cotainer Mechanical assembly

By April 2006 the first mechanical assembly trial
was performed at CIEMAT

9
Radiator Cotainer Mechanical assembly

Aerogel tiles are cut at the corners
PORON is placed around each tile

The NaF cover is placed and bolted by 13 spacers
PORON behind and around each tile

10
Vibration Test configuration

Vibration test of the LOWER TOF System.
Use the opportunity to integrate the RICH
Radiator container in the LOWER TOF Structure and
perform the vibration test.
RADIATOR CONTAINER CONFIGURATION
¼ of aerogel tiles mass equivalent
100 of the NaF tiles

11
Vibration Test configuration
12
Visual inspection before vibration
13
Travel to SERMS (Terni)
Radiator Container sent to SERMS (Terni) on
Friday July 14th.
14
AEROGEL CHARACTERIZATIONOptical bench

Designed for easy, controllable/programable,
accurate (X,Y,q), movements of the laser source
and measured sample.

Screen and camera
3 m
q
Y
X
15
Image analysis procedure
_ Fit to determine the beam center
Gaussian fit of the highest intensity pixel
n1.0475 /- 10-4

Corrections included
Air index (nair1.0003)
Clarity effect (shift of the beam center)
distance L

6
16
RICH Detector Detection Plane
Main Structure
680 UNIT CELLS
Rectangular short Grid
Triangular Grid
Rectangular long Grid
17
RICH Detection Plane
HV patch panel
Unit cells
Readout electronic
Internal beams
DETECTION PLANE
Skin
U-beam
18
RICH Detection Plane Unit cells

UNIT CELL ASSEMBLY SEQUENCE
Module quality control
LG gluing and wire installation
Shielding installation
DTS (Dallas Thermal Sensors) gluing

UNIT CELLS ASSEMBLY STATUS 680 unit cells are
finished are ready for grid assembly
19
RICH Detection Plane Grid assembly

GRID ASSEMBLY SEQUENCE
Mechanical integration
HV-PP assembly and HV cable welding
DTS interconnection
Kaptons assembly
Verification test
HV connectivity
DTS test

20
RICH Detection Plane Grid assembly
21
RICH Detection Plane Grid Vibration Test
Mechanical interface for Grid Vibration test
22
Functional Test
23
Functional Test
HV Brick
JIN-R
CDP Connection

Online/SlowCtrl SW Validation
AMSWire Communication Protocol (JINR, CDPs)
HV Brick Control (Lecroy Bus)
DSP SW (Calibration, Modes)
Dallas Temperature Sensors Readout

Dallas Temperature Sensors Connector
24
Functional Test PMT Characterization

Characterization Data
NO HV Pedestals Noise
NOMINAL HV
DARK RUNS Pedestals, Noise Dark
Current
LED RUNS Gains
FIBER STAND RUNS Efficiencies

25
Functional Test Pedestals and Noise

All Channels OK
No difference between HV ON/OFF
(on pedestals noise)
s PED(x5) 4.8 0.2 (RMS)
s PED(x5)/ s PED(x1) 4.7 0.3 (RMS)
Average Dark Current 0.710-4 / channel

26
Functional Test Gain Calibration (Single Photon)
Integrated Optical Fiber System

Light from a Blue LED is guided with an optical
fiber and flashed upwards to the plastic layer of
the Radiator container.
The light is reflected down firing the PMT Grid

27
Functional Test Gain Calibration (Single Photon)
Portable Optical Fiber System
GAIN CALIBRATION SYSTEM VALIDATION

Gain Calibration provides consistent values for
both illuminations
Average Gain centered at 110 14 ADC Counts
Consistent with the expectations from the Data
Base

28
Functional Test Stability

Pedestal position and width are stable within
1.5 ADCc and 1
Gains are stable within 1

29
Functional Test Efficiency
Systematic error contributions to the RICH
particle electric charge determination

Fully correlated uncertainties, should be
monitored at the 1-2 level
Photon yield calibration/monitoring procedure ?
real data
PMT temperature monitoring with 2 oC precision
? Temperature monitoring
Single channel calibration precisions better than
10 are needed
Gain calibration/monitoring procedure ? real
data
PMT level non uniformities on the detection
efficiency should be known at the 3-5 level
Efficiency calibration ? LED calibration
procedure