Overview of GRETINA IYang Lee Lawrence Berkeley National
Overview of GRETINA I-Yang Lee Lawrence Berkeley National Laboratory GRETINA Auxiliary Detector Workshop Washington University 28 - 29 January 2006
Outline § Status § Mechanical interface § Data acquisition interface § Summary
Highlight of recent achievements § Obtained CD 2 A/CD 3 A approval, 6/16/05 § Awarded detector contract 9/30/05 § Published prototype II in-beam test results § Refurbished prototype II detector § Tested prototype III detector module - Purchase 3 detectors - 1 detector, with options for 7 total - Obtained 2 mm position resolution - With 18 cold and 18 warm FETs
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 4 C, 88” Cyclotron LBNL FMA, ATLAS ANL RMS, HRIBF ORNL S 800, NSCL MSU § Collected 3 D 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 x 2 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 Drain wire for pairs Twisted pair with shielding 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 § Trigger/timing system § Processing farm § Data storage § Signal digitizer § Network switch § Workstations Data Acquisition System Schematic Local Trigger Module Global Trigger Module Signal Digitizers 2. 2 MB/s 28 Crystals 66 MB/s Network Switch Processing Farm 75 dual Processors 6. 9 MB/s Aux. Det. Trigger Workstations, Servers Aux. Det. Data Storage 2. 3 MB/s + Aux. Det. Data
Data Acquisition Trigger GRETINA Auxiliary Detector Each segment generates and receives trigger Accept and provide multiple trigger types FPGA based trigger unit Timing Each segment has LED and CFD At least one time stamp per time stamps event Readout Buffered readout for each module Two-level event building, crystal and global Analog signals Digitized data streams Ethernet packets
Auxiliary detector interface § Interface options § Trigger in/out § Time stamp § Data read out Analog signals Digitized data streams Ethernet packets Data Acquisition System Schematic Local Trigger Module Signal Digitizers Aux. Detector crates Global Analog signal Trigger Module Aux. Det. Trigger Clock Aux. Detector Interface crate A T D D C C Time CAMAC FERA Time stamp FERA data stream Ethernet packets Network Switch
Acquisition interface options Additional hardware and software not funded currently
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
Schedule WBS Task Name 1 1. 1. 2 1. 1. 3 1. 2 Mechanical Production Detector Module 1. 2. 2 Test/Characterize Module 1 1. 3. 3 Production Prototype 1. 4. 3 Production 1. 5. 2 Complete test DSP module Start production DSP module Computing Systems 1. 4. 2 1. 5. 1 Exercise option last module Complete test proc. and apparatus Complete test/char. module Test/Characterize Rest of Modules Prototype 1. 5 Award module contract Electronics 1. 3. 2 1. 4 Complete design/draw. support structure Complete mechanical subsystem Design Purchasing 1. 3 2004 2005 2006 2007 2008 2009 2010 2011 3 4 1 2 3 4 1 2 3 4 GRETINA 1. 2. 1 1. 2. 3 2003 Award computer farm contract System Assembly Ready for prototype assembly Ready for final assembly Prototype Production 1. 6 Project Management 1. 7 Environment and Safety 1. 12 Level 1 Milestones: Critical Decisions CD 0 CD 1 CD 2/3 A CD 2/3 B January 2006 CD 4
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 § § § 48 Ca + 124 Sn 200 Me. V Target 1 mg/cm 2 Acceptance 5 cm Dia.
S 800 Efficiency
RMS Efficiency • • Nominal target to quad distance = 72 cm Acceptance angle= ± 30 mr (H), ± 100 mr (V)
- Slides: 20