The Coupling Impedance of a Toroidal Beam Tube With Circular Cross Section Page: 2 of 2
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Fig. 4. Pulse forming network.
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-tapered from one end to the other (Fig. 4). The observed
current pulse at 33 kV is shown in Fig. 5. Although
relatively conventional in its design, pre-fire problems
plagued the units. Holding the voltage during the 10-hour
store time was finally demonstrated after careful
conditioning of the thyratron and proper choice of the
trigger circuitry. The latter design was complicated by the
broad operating range from RHIC injection energy to
storage energy or -3 to 33 kV.
5 ACKNOWLEDGEMENTS
The conceptual design of the beam abort system was
finalized by Michael Harrison and the preliminary design of
the pulsed power supply was done by Eric Forsyth and
Chisl Pappas. iL is WIUL pJeasui Lu aknwvweduge
consultations on the pre-fire problem with Ron Sheldrake
(EEV), Ron Navrocky and Joe S Nee .T VNNT '), Laurent
Ducimetiere (CERN), Chris Jensen (FNAL), and our
colleagues from the AGS and RI-C.
SA. J. Stevens, Cnncentual Design f the RJHIC Dumn
Core, Report AD/RHIC/RD-94 (BNL 1995).-I. A@ VS '& -1.9 "it
Fig. 5. Abort kicker current pulse shape at 33 kV
(5 kA per unit).
4 PULSED POWER SUPPLY
A separate power modulator powers each abort kicker
magnet. The main components of the modulator are the
Pulse Forming Network, the deuterium thyratron EEV
CX1575C to hold off voltage, the DC power supply, and the
trigger circuitry. The ceramic 4.5-in. diameter hollow
anode tube was selected in view of its reverse current
capabilities and is operated in air. The measured inductance
of the kicker magnet with feedthrough is 1.67 pH. In order
to achieve the 1 ps rise time, a PFN impedance of -2 92 is
required, which brings the voltage into the 30 - 40 kV
range. Dispersing the beam on the dump block is achieved
by modulating the current during the pulse between 14 and
21 kA at top energy. This is accomplished by using a PFN
in which the impedance of the network is mismatched andSu-
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s~ v'
15.6 v0.39uF 0.39uF 0.39uF 0.39uF
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Hahn, H. The Coupling Impedance of a Toroidal Beam Tube With Circular Cross Section, article, March 29, 1999; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc707324/m1/2/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.