JENSA -- Jet Experiments in Nuclear Structure and Astrophysics

A major piece of instrumentation at FRIB useful for nuclear astrophysics (as well as other areas) will be a gas jet target system. The system envisioned will be a H and He gas jet target with a high density (1e19 atoms/cm2) and a jet diameter (approximately 2 mm) matched to the FRIB beam. This system will be able to work in a standalone mode -- useful for transfer reaction measurements -- or as coupled to the SECAR recoil separator system -- useful for capture reaction measurements. It is also envisioned that this target can be used in an extended target mode (with target region ~ 10 cm long) in addition to the default gas jet target mode (with a jet diameter of ~2 mm, matched to the FRIB beam).

The JENSA collaboration has beef formed to improve communication between different gas jet target systems. If you are interested in joining the JENSA collaboration, please contact Uwe Greife, ugreife at


March 2011: JENSA Workshop
The JENSA Collaboration had a meeting on Friday, March 25, 2011 at the Colorado School of Mines [CSM] in Golden, Colorado. Details of the meeting can be found on this page. Kelly Chipps from CSM gave an overview of JENSA at the meeting - you can view it by clicking here.

February 2011: JENSA Summary to the FRIB Science Advisory Committee
The FRIB Science Advisory Committee (SAC) had a meeting in February 2011 and requested input from all the FRIB Working Groups. The purpose of the SAC meeting was to review the recent progress from the Working Groups and make recommendations to the FRIB facility on near-term funding priorities. To view the JENSA summary to the FRIB SAC, please click here.

February 2010: FRIB Equipment meeting
A discussion of the gas jet target system was held at the FRIB Equipment Workshop on the campus of Michigan State University, East Lansing, Michigan on Saturday, February 20, 2010, from 19:30 - 21:30 in the Salon (B+C) Rooms at the East Lansing Marriott Hotel, 300 MAC Avenue, East Lansing, MI 48823.

Status & History

In the past, two different gas target systems were being concurrently developed. One is a collaboration of Colorado School of Mines / Oak Ridge National Lab / Louisiana State University and was to be utilized at ORNL HRIBF and TRIUMF ISAC, then moved to FRIB. The second target system was to be developed by JINA for use at the ReA3 area at MSU NSCL in preparation for FRIB. A status report on JENSA describing this was prepared for the FRIB SAC in February 2011.

As a result of the March 2011 JENSA meeting, these efforts will now be combined, and one system will be built, tested, and commissioned at ORNL HRIBF and then moved to ReA3 at MSU NSCL. More details will be posted here when available.


JENSA status to FRIB SAC [February 2011]

Future Meetings

Please check here for future collaboration meetings.

Past meetings included the March 2011 JENSA Workshop and the February 2010 FRIB Equipment Workshop.


JENSA Overview, Kelly Chipps, March 2011

Collaborators' Pages

We will establish password-protected pages for JENSA collaborators here.

If you are interested in joining the JENSA collaboration, please contact Uwe Greife, ugreife at