Overview of GRETINA

1
Overview of GRETINA

• I-Yang Lee
• Lawrence Berkeley National Laboratory
• GRETINA Auxiliary Detector Workshop
• Washington University
• 28 - 29 January 2006

2
Outline

• Status
• Mechanical interface
• Data acquisition interface
• Summary

3
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

4
Signal decomposition meeting
5
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

6
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)
7
Target chamber
6 Ports ? Beam in ? Beam out ?
Target/cable x2 ? Target port at 90º ? Viewing
port
? Target to Ge 17.8 cm ? Inner radius 17 cm
? Cord radius 16 cm
8
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

Drain wire for pairs
Cable drain wire
Twisted pair with shielding
Cable shielding
Jacket
9
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)

10
Data Acquisition System

• Signal digitizer
• Network switch
• Workstations

• Trigger/timing system
• Processing farm
• Data storage

11
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 signals Digitized data streams Ethernet packets
12
Auxiliary detector interface

• Interface options
• Analog signals
• Digitized data streams
• Ethernet packets

• Trigger in/out
• Time stamp
• Data read out

Data Acquisition System Schematic
Local Trigger Module
Signal Digitizers
Aux. Detector crates
Global Trigger Module
Analog signal
Network Switch
Aux. Det. Trigger
Clock
Aux. Detector Interface crate
TDC
ADC
Time
FERA data stream
FERA
CAMAC
Time stamp
Ethernet packets
13
Acquisition interface options
Additional hardware and software are not funded
currently
14
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

15
New auxiliary/external detectors

• Super-CHICO

16
Schedule
WBS
Task Name
2003
2004
2005
2006
2007
2008
2009
2010
2011
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
4
1
GRETINA

1.1
Mechanical


1.1.2
Design
Complete mechanical subsystem

1.1.3
Production
1.2
Detector Module


Award module contract

Exercise option last module

1.2.1
Purchasing

Complete test proc. and apparatus


1.2.2
Test/Characterize Module 1
Complete test/char. module
1.2.3
Test/Characterize Rest of Modules


1.3
Electronics
Complete test DSP module

1.3.2
Prototype

Start production DSP module

1.3.3
Production
1.4
Computing Systems

1.4.2
Prototype
Award computer farm contract

1.4.3
Production

1.5
System Assembly
Ready for prototype assembly


1.5.1
Prototype
Ready for final assembly

1.5.2
Production
1.6
Project Management
1.7
Environment and Safety





1.12
Level 1 Milestones Critical Decisions
CD2/3B

CD0

CD1

CD2/3A

CD4

January 2006
17
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

18
FMA Efficiency

• 48Ca 124Sn 200 MeV
• Target 1 mg/cm2
• Acceptance 5 cm Dia.

19
S800 Efficiency
20
RMS Efficiency

• Nominal target to quad distance 72 cm
• Acceptance angle 30 mr (H), 100 mr (V)