Commissioning of the EBIS-based heavy ion preinjector at Brookhaven Page: 7 of 7
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and deflectors, LEBT solenoid & deflectors, MEBT
quads, linac quads, and HEBT quads & steerers).Table 3: Parameters for
demonstrated for CD-4.helium, gold and iron ions
Parameter He"r Au32 Fe+20
g/m 0.25 0.162 0.357
Platform Voltage (kV) 68 104 47.6
RFQ Power (kW) 40 95 20
Linac Power (kW) 75 180 37
Dipole Current (A) 1415 2270 1030
Pulse Length (ps) 20 20 36
Rep. Rate (Hz) 1 1 1
Intensity (108) ions/pulse 1250 3.7 4.75
Energy (MeV/u) 2 2 2
Transmission, 75 90* 60*
RFQ input to middle of bend (*=inferred, due to multiple
charge states)
TRANSITION TO OPERATIONS
Following this successful demonstration of CD-4
requirements, we now have a plan to ramp up the intensity
to the full design values during the coming RHIC run
cycle. Helium and neon beams from EBIS will be used
for experiments at the NASA facility in November, 2010.
Increased intensities for Au, U, Fe, etc. will then come
about through a combination of the following: 1) doing a
full bake of EBIS (EBIS has yet to be baked, so there is a
significant impurity content in the beam), 2) transmission
improvements, 3) routine operation at 10A electron beam,
and 4) increase of injected 1+ ion intensity.
EBIS beams can be developed even while RHIC and
NSRL are taking beams from the Tandem, since pulses
from both preinjectors can be interleaved within one
accelerator "supercycle". Once the required intensity is
achieved from EBIS for any species, EBIS will be used
rather than Tandem. EBIS is expected to provide uranium
ions for a short run of uranium for RHIC in the spring.
SUMMARY
All systems making up the new EBIS preinjector are
operating, and performing as expected. There has beengood agreement between measurements and simulations
for the EBIS, RFQ, linac, and transport lines. The EBIS
has operated continuously for multi-day shifts. The
superconducting solenoid has been at full field for many
months. Her1, An"+ and Fe20+ beams were transported to
Booster, and helium was circulated in Booster.
Alternating pulses of Au" and Fe2"+ every 2 seconds has
been demonstrated. All CD-4 requirements (for official
project completion) have been achieved. The full design
parameters are met routinely for platform voltage, if
powers, magnet currents, etc., except for full electron
current and source repetition rate (pushing these
parameters was delayed until after completion of CD-4
requirements). The next phase is now ramp-up of the
intensity, but no new hardware is required for this.
REFERENCES
[1] J. G. Alessi, et. al., "The Brookhaven National
Laboratory electron beam ion source for RHIC",
Rev. Sci. Instrum. 81, 02A509 (2010).
[2] A Pikin, et. al., "RHIC EBIS: basics of design and
status of commissioning", J. Inst. 5 C09003 (2010).
[3] G. Kuznetsov, Nuclear Instrum. & Meth. In Physics
Res. A 340, 1994, p. 204.
[4] ACCEL Instruments GmbH, Bergisch Gladbach,
Germany.
[5] E.N. Beebe, et. al., "Test EBIS Operation and
Component Development for the RHIC EBIS",
Journal of Phys.: Conf. Series 2 164-173. (2004)
[6] M. Vossberg, et. al., "The new EBIS RFQ for BNL",
Proc. of Linac 2008, Victoria, BC, Canada.
[7] Continental Electronics Corp., Dallas, TX.
[8] M. Okamura, et.al., "Beam Commissioning Results
for the RFQ and MEBT of the EBIS Based
Preinjector for RHIC", these proceedings.
[9] D. Raparia, et.al., "Commissioning of the IH Linac
and High Energy Beam Transport of the EBIS Based
Preinjector for RHIC", these proceedings.
[10] Sigmaphi, Vannes, France.
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Alessi, J.; Beebe, E.; Binello, S.; Hoff, L.; Kondo, K.; Lambiase, R. et al. Commissioning of the EBIS-based heavy ion preinjector at Brookhaven, article, September 12, 2010; United States. (https://digital.library.unt.edu/ark:/67531/metadc837875/m1/7/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.