JENSA Workshop March 2011
The JENSA Collaboration had a meeting on Friday, March 25, 2011 at the Colorado School of Mines [CSM] in Golden, Colorado.
Agenda
10:00 am Welcome and introductionsKelly Chipps: overview of Gas Jet Target
Manoel Couder: recent results and lessons from the Notre Dame gas jet
11:00 am Discussion: general project issues
(locations, funding, requirements, specifications, resources, delegation of responsibility)
12:30 pm Working lunch (provided)
1:30 pm Presentations: technical issues
Schatz/Montes: ReA3 updates, timelines, specifications, etc.
Erikson: low cost gamma array for the gas jet
Bardayan/Pain/Blackmon: charged particle and recoil detection
Discussion: technical issues (infrastructure, gases, detection systems, diagnostics, experimental campaigns)
4:00 pm Summary
Meeting Summary
- JENSA updates (Chipps) - see slides- General discussion:
+ funding to build only one jet, so it will start at ORNL (HRIBF) in late 2011/2012 and will be moved, once tested, to the ReA3 hall in early 2013 (despite the possible closure of the HRIBF, beams for testing will still be available, and the DRS beamline will likely not be needed during the next couple years of experimental campaign)
+ pumps, etc will be ordered in the summer of this year, as the equipment funding must be committed by end of fiscal year
- Lessons learned from St. George (Couder):
+ capabilities for characterization need to be built-in from the start
+ possible other applications (lasers, etc)
+ involvement of fluid dynamics experts for characterization of the jet? (get a good starting point for testing, etc)
- Timeline/news from ReA3 (Montes/Schatz):
+ yield calculator available at www.nscl.msu.edu/exp/sr/yields
+ at the moment, stable beams < 1 MeV/u
+ beamline construction next year
+ hope for "first rare beam into ReA3" in Jan 2012, and first distribution of beams (to target stations) in Jan 2013
+ beam at target location expected to be roughly 0.5mm (one sigma), so a beam diameter of roughly 2mm x&y
+ at the moment, there is no crane in the ReA3 experimental hall (this needs to be considered)
+ the compressor for the jet must be indoors at ReA3
+ ReA3 call for proposals (May): JENSA (as a collaboration) should submit a letter of intent describing their general experimental campaign
- Development of a close-packed, highly cost effective gamma array for the jet (Erikson):
+ not meant as a substitute for something like GRETA, but as a complement to other jet detectors
+ uses PIXI electronics and achieved good resolution in tests
+ effect of kinematics (doppler broadening) still to be tested
- Jet at HRIBF with superORRUBA (Bardayan):
+ 24 detectors ordered with 17 in-house
+ superORRUBA utilizes ASICs
+ placement of jet at HRIBF for testing/commissioning makes fiscal sense as HRIBF has funding and equipment already invested, plus the DRS
+ reuse of existing equipment (incl DRS and several pumps)
+ superORRUBA can be adapted to fit around the jet, with QQQs/CDs at forward/backward angles (as necessary)
- ANASEN and the jet (Blackmon):
+ mounts/footprints for the ANASEN, ORRUBA and superORRUBA detectors all the same, so individual detectors are interchangeable
+ ANASEN provides an extended gas target for (a,p) studies, but jet could be used with 4He to look in-depth at a few energies based on the excitation function seen by ANASEN (wouldn't require a full recoil separator)
+ use new design QQQ3s with jet as well
+ possibility of ReA3 beamline sharing?
- Discussion:
+ mounting and alignment of pumping stages and apertures, sizes of apertures
+ compressor housing/enclosure
+ He pressure loss due to piping
+ location of detectors, cabling, and diagnostics (esp. alignment: faraday cup, phosphor, collimator, iris?)
+ custom parts for electronics feedthroughs (ie, a new ORRUBA "donut")
+ detector noise from pumps?
+ specific backing (dry) pumps
+ updates to website
+ eventual capabilities of ReA3 hall (6MeV/u, 9MeV/u)
+ JINA funding - use for recoil detectors? jet upgrades?
+ possibility of monthly collaboration call?
- To Do:
+ Memorandum of Understanding to officially form the JENSA collaboration
+ LoI for ReA3
+ NSCL project management plan for jet
+ fluid dynamics simulations of jet?
+ pumping scheme modeling?
+ continued purchasing/construction
A meeting summary will be posted here when available.
If you are interested in joining the JENSA collaboration, please contact Uwe Greife, ugreife at mines.edu.
