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Overview of GRETINA
I-Yang Lee
Lawrence Berkeley National Laboratory
GRETINA Auxiliary Detector WorkshopWashington University
28 - 29 January 2006
Outline
Status Mechanical interface Data acquisition interface Summary
Highlight of recent achievements
Obtained CD2A/CD3A approval, 6/16/05 Purchase 3 detectors
Awarded detector contract 9/30/05 1 detector, with options for 7 total
Published prototype II in-beam test results Obtained 2 mm position resolution
Refurbished prototype II detector With 18 cold and 18 warm FETs
Tested prototype III detector module
Signal decomposition meeting
Status of mechanical structure
Completed conceptual design, except for the quarter sphere.
Carried out finite element analyses to ensure the required rigidity of the support structure.
Studying installation at potential sites. Fabrication drawings for hexapod are being made. Schedule to complete 3/31/06
Installation at potential sites• Cave 4C, 88” Cyclotron LBNL• FMA, ATLAS ANL• RMS, HRIBF ORNL• S800, NSCL MSU
Collected 3D drawings Visited MSU, ANL and ORNL Challenges :
- Position GRETINA at the ideal location of the spectrographs.- Detector at forward angle at NSCL
Proposed a 4-ring design Modification to fit ANL and ORNL
Detector angles: 31.7º (5 positions), 58.3º (4), 90º (8), and 121.7º (4)
Target chamber
∎ Target to Ge = 17.8 cm∎ Inner radius = 17 cm ∎ Cord radius = 16 cm
6 Ports∎ Beam in ∎ Beam out ∎ Target/cable x2∎ Target port at 90º ∎ Viewing port
Electronics status
Completed electronics requirement document Studied the Eurisys pre-amplifier. Completed the grounding and shielding design. Tested selected signal cables, and connectors. Decided to implement trigger serializers using
FPGAs and standard protocols
Detector analog signals Digitizer
Zo/2
Cable: twisted pairs
C
Twisted pair with shielding
Drain wire for pairs
Cable drain wire
Cable shielding
Jacket
Computing system status
Completed Computing system requirement document
Integrated software to perform end-to-end test– Detector signal crystal event building signal
decomposition global event building tracking disk
Improved data acquisition software– Eliminated errors– New run control system
Design and purchased prototype computer cluster (with 8 nodes)
Data Acquisition System
Signal digitizer Network switch Workstations
Data Acquisition System Schematic
Aux. Det. Trigger
Global TriggerModule
SignalDigitizers
Local TriggerModule
NetworkSwitch
Processing Farm
28 Crystals
Data Storage
2.2 MB/s
Aux. Det. Data
66 MB/s
75 dual Processors
Workstations, Servers
6.9 MB/s
2.3 MB/s + Aux. Det. Data
Trigger/timing system Processing farm Data storage
Data Acquisition
GRETINA Auxiliary Detector
Trigger Each segment generates and receives trigger
FPGA based trigger unit
Accept and provide multiple trigger types
Timing Each segment has LED and CFD time stamps
At least one time stamp per event
Readout Buffered readout for each module
Two-level event building, crystal and global
Analog signalsDigitized data streamsEthernet packets
Auxiliary detector interface Trigger in/out Time stamp Data read out
Interface options
Analog signals Digitized data streams Ethernet packets
Data Acquisition System Schematic
Aux. Det. Trigger
Global TriggerModule
SignalDigitizers
Local TriggerModule
NetworkSwitch
Time
Aux. Detector Interface crate
Tim
e stamp
Aux. Detector crates
FE
RA
CA
MA
C
TDC
ADC
Clock
Ethernet packets
Analog signal
FERA data stream
Acquisition interface options
Additional hardware and software are not funded currently
Options Signal Additional hardware Additional software
Preamp signals Pulse digitizer
VME crate
VME controller
NONE
Analog signal
Shaped signals
Trigger
time
VME ADC, TDC
Time stamp module
VME crate
VME controller
Module control
Module readout
Digitized data stream
FERA
Trigger
time
FERA interface module
Time stamp module
VME crate
VME controller
Module control
Module readout
Ethernet packet
Ethernet packets
Trigger
time
NONE
NONE
Auxiliary detector interfacing issues
• Mechanical– Space inside chamber– Vacuum– Cable and target ports– Interference with external structure and
detectors
• Data acquisition– Number of allowed interface options– Additional hardware needs– Additional software efforts
New auxiliary/external detectors
• Super-CHICO
ScheduleWBS Task Name
1 GRETINA
1.1 Mechanical
1.1.2 Design
1.1.3 Production
1.2 Detector Module
1.2.1 Purchasing
1.2.2 Test/Characterize Module 1
1.2.3 Test/Characterize Rest of Modules
1.3 Electronics
1.3.2 Prototype
1.3.3 Production
1.4 Computing Systems
1.4.2 Prototype
1.4.3 Production
1.5 System Assembly
1.5.1 Prototype
1.5.2 Production
1.6 Project Management
1.7 Environment and Safety
1.12 Level 1 Milestones: Critical Decisions CD1 CD2/3A CD2/3B CD4
Complete test proc. and apparatus
Award module contract Exercise option last module
Complete mechanical subsystem
Complete test DSP module
Start production DSP module
Award computer farm contract
Ready for prototype assembly Ready for final assembly
CD0
3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 42003 2004 2005 2006 2007 2008 2009 2010 2011
Complete test/char. module
Complete design/draw. support structure
January 2006
Summary GRETINA is on budget and on schedule. In 2006 design work of all systems will be in
progress Process of design interface with auxiliary detector
Developed requirement documents Working with potential sites and working groups Make decisions on design Designs
Auxiliary/external detectors are essential Many challenges and opportunities for auxiliary
detectors This workshop is an important step in advancing
the state-of-the-art
FMA Efficiency 48Ca + 124Sn 200 MeV Target 1 mg/cm2
Acceptance 5 cm Dia.
0
20
40
60
80
100
120
30 40 50 60 70 80 90 100
Distance (cm)
Eff
icie
nc
y (
%)
4n2p2nalpha 2n
S800 Efficiency
RMS Efficiency
• Nominal target to quad distance = 72 cm
• Acceptance angle= ± 30 mr (H), ± 100 mr (V)
0
0.2
0.4
0.6
0.8
1
1.2
70 80 90 100 110 120 130 140
Distance (cm)
So
lid
an
gle
fra
ctio
n