The Supersonic Gasjet Target and its Experimental Enviroment at the ESR Storage Ring

The Supersonic Gasjet Target

Target species and densities The supersonic jet provides target atoms with a very narrow momentum spread. For a detailed description of the jet-target see: The Hydrogen Cluster Target at the ESR

Experimental Enviroment at the ESR Jet-Target

For experiments at the supersonic jet-target two experimental reaction chambers are available, one dedicated to spectroscopy and collision studies by means of x-ray detection the other devoted to recoil ion spectroscopy. The two set-ups can be interchanged at typical time intervalls of approximately one year. The 0-deg electron spectrometer, now available at the ESR, serves as a permanent experimental installation.

a) X-Ray Detector Chamber Combined with 0-deg Electron Spectrometer

Supersonic jet-target with the x-ray detection chamber. Downstream from the target zone, the 0-deg electron spectrometer is mounted.

Schematic view of the x-ray detection chamber.

b) Recoil Ion Chamber with Reaction Microscope and 0-deg Electron Spectrometer

The reaction microscope at the ESR gas jet consists of a set of guiding fields, a longi-tudinal magnetic B-field (along the projectile axis) combined with a flexible configuration of electrostatic-extraction E-fields extending over the entire target zone also including recoil- and low-momentum electron detectors. Recoiling target ions and low momentum electrons (p_e < 10 a.u.) emanating from the target zone can be extracted onto multihit capable 2D position sensitive detectors at opposite ends of the target region. Electrons emitted from collision partners in the target region with 0° ±2° with respect to the beam direction and velocities around the projectile velocity will be momentum analyzed and guided onto a 2D position sensitve detector while permitting to reconstruct their primordial emission charcteristics.

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