Status of the HERMES atomic beam source and possible improvements

Details Status of the HERMES atomic beam source and possible improvements Status of the HERMES atomic beam source and possible improvements

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..570..894n&link_type=abstract

The fourteenth international spin physics symposium, SPIN2000. AIP Conference Proceedings, Volume 570, pp. 894-894 (2001).

Physics

Ion Sources: Polarized, Beam Dynamics, Collective Effects And Instabilities

Scientific paper

To improve the flow rate of about 4.5.1016Dvec/s a new dissociator based on a microwave discharge at 2.45 GHz has been developed and installed into the HERMES Atomic Beam Source. The long term stability was found to be excellent. Compared with the Radio-Frequency dissociator (RFD) used so far the intensity was increased by 15% although the sextupole magnet system has been optimized for the RF-dissociator. Furthermore the Carrier Jet method was tested, a new method of beam formation based on an expanded beam surrounded by an overexpanded carrier jet. Since there was a large deviation between the measurements and the results of the Navier-Stokes calculations Monte Carlo simulations were performed. The results agree well with the measurements, showing that the method used in ref. does not provide a realistic description of beam formation in this flow range, in particular concerning the diffusive mixture of the two beams. .

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