Proposal Writing Workshop

FRIB hosted a remote FRIB Proposal Writing Workshop on May 4 - 8, 2020. You can view the invitation letter for the Workshop by clicking here.

One of the information sessions of this workshop was dedicated to proposals for SECAR experiments. Please click here to see the invitation letter encouraging participation in the SECAR information session and a planned follow-up breakout session.
The session was held via the Zoom software platform starting at 16:00 EDT on Wednesday, May 6, 2020.

Preparing an Experiment Proposal

Here are the steps to prepare a proposal using the SECAR system with members of the SECAR Collaboration:

• PI formulates experiment idea

• PI joins the SECAR Collaboration (SC) if not yet a member

• PI sends abstract of proposal to the SC Executive Council one month before the facility proposal deadline

• PI uses these resources listed below to help prepare proposal

• PI sends draft of proposal to the SC Executive Council two weeks before the facility proposal deadline

• SC Executive Council distributes proposal to all members of Core Group and invites them and their research group members to join proposal

• SC Executive Council informs PI of final list of participants

• PI can circulate proposal to others outside the SC as desired

• PI incorporates comments from SC Executive Council and Core Group members if any

• PI finalizes proposal and submits by facility deadline


Here are some resources that may be useful for proposal writing:

• SECAR technical information
    — Windowless gas target configuration: extended target chamber or jet (JENSA)
    — Extended target maximum thickness: 1e19 cm-2
    — Jet target maximum thickness: 1e19 cm-2
    — Gamma detection at target: BGO array
    — BGO efficiency: 49% at 1.3 MeV with extended target
    — nominal angular acceptance: +/- 25 mrad
    — nominal energy acceptance: +/- 3.1%
    — nominal rigidity acceptance: 0.14 - 0.8 (B rho), 1 - 16 MV (E rho) for standard optics
    — charge state acceptance: only a single charge state accepted by the full system
    — rejection of primary beam: initial goal 1e-13 for masses A<65
    — beam rejection: sufficient for (p,gamma) measurements with 1e07pps beam intensity
    — beam rejection: expected to be better for lighter mass beams
    — beam rejection: expected to be worse for heavier beams but experiments still possible
    — performance: expected better for reactions with larger beam-recoil mass differences
    — Focal plane position measurement: 2 microchannel plate TOF detectors
    — Focal plane particle ID: gas ionization counter
    — Focal plane energy measurement: Si detector

SECAR Information (May 2020)

SECAR design (pre-CDR report)

• "Design of SECAR: a Recoil Mass Separator for Astrophysical Capture Reactions with Radioactive Beams" by G. Berg, M. Couder, M.T. Moran, K. Smith, M. Wiescher, H. Schatz, U. Hager, C. Wrede, F. Montes, G. Perdikakis, X. Wu, A. Zeller, M.S. Smith, D.W. Bardayan, K.A. Chipps, S.D. Pain, J. Blackmon, U. Greife, K.E. Rehm, and R.V.F. Janssens, Nuclear Instruments and & Methods A 877, (2018) 87-103.

• For additional questions on SECAR ion optics, rigidities, acceptance, please contact Manoel Couder (mcouder at

JENSA update presentation by Kelly Chipps (May 2020)

• "Status of the JENSA gas-jet target for experiments with rare isotope beams", K. Schmidt, K.A. Chipps, S. Ahn, D.W. Bardayan, J. Browne, U. Greife, Z. Meisel, F. Montes, P.D. O'Malley, W-J. Ong, S.D. Pain, H. Schatz, K. Smith, M.S. Smith, P.J. Thompson, Nuclear Inst. Meth. A 911 (2018) 1-9.

• For additional questions on the JENSA gas target system, please contact Kelly Chipps (chippska at

• For questions on the SECAR focal plane detector system, please contact Jeff Blackmon (blackmon at

beam rate calculator

relativistics kinematics

LISE++ code system

  Separator for Capture Reactions