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Studies of beam injection with a compensated bump and uncompensated bump in a synchrotron
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10.1063/1.4817676
/content/aip/journal/rsi/84/8/10.1063/1.4817676
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/8/10.1063/1.4817676

Figures

Image of FIG. 1.
FIG. 1.

The layout of the synchrotron. Here, BM, QF, and QD represent bending, focusing quadrupole, and defocusing quadrupole respectively. S1–S6 denote the straight section numbers and RF denotes RF cavity. The injection septum and three injection kickers are located in S1, S2 and S6 straight sections.

Image of FIG. 2.
FIG. 2.

Lattice functions for one superperiod at the operating point (2.11, 1.44).

Image of FIG. 3.
FIG. 3.

Compensated injection orbit bump of 38.0 mm.

Image of FIG. 4.
FIG. 4.

A normalized phase space circles of the injected beam and for the residual oscillation.

Image of FIG. 5.
FIG. 5.

Variation of maximum beam displacement with injection angle for different slices in the compensated bump scheme. The solid and dotted lines indicate accepted and unaccepted part of the beam slices respectively. The calculations have been carried out by Eq. (10) .

Image of FIG. 6.
FIG. 6.

Effect of injection angle on amplitude of residual betatron oscillations for different slices in the compensated bump scheme. The solid and dotted lines indicate accepted and unaccepted part of the slices, respectively. The calculations have been carried out by Eq. (11) .

Image of FIG. 7.
FIG. 7.

Movement in phase space of first to six slices of the injected beam at the septum for the injection angle of −0.4 mrad for the compensated bump of 38 mm. The vertical bars near x = 32 mm indicates the inner edge of the injection septum magnet. The phase space plots have been simulated by using the computer code RACETRACK.

Image of FIG. 8.
FIG. 8.

Movement in phase space of first to six slices of the injected beam when the beam injection angle is varied from −0.4 mrad to 0.8 mrad in step of 0.2 mrad during injection in the compensated bump scheme. The vertical bars near x = 32 mm indicates the inner edge of the injection septum magnet. The phase space plots have been simulated by using the computer code RACETRACK.

Image of FIG. 9.
FIG. 9.

The bumped closed orbit in the uncompensated orbit bump scheme with all kickers set at 14.6 mrad. The bumped orbit is calculated by using Eq. (12) .

Image of FIG. 10.
FIG. 10.

Variation of maximum beam displacement with injection angle for different slices in the uncompensated bump scheme. The solid and dotted lines indicate accepted and unaccepted part of the beam slices, respectively. The calculations have been carried out by using computer code RACETRACK.

Image of FIG. 11.
FIG. 11.

Effect of injection angle on amplitude of residual betatron oscillations for different slices in the uncompensated bump scheme. The solid and dotted lines indicate accepted and unaccepted part of the slices, respectively. The calculations have been carried out by using computer code RACETRACK.

Image of FIG. 12.
FIG. 12.

Movement in phase space of fifth to nine slice of the injected beam at the septum at the injection angle of 4.6 mrad for the uncompensated bump scheme. The vertical bars near x = 32 mm indicates the inner edge of the injection septum magnet. The phase space plots have been simulated by using the computer code RACETRACK.

Image of FIG. 13.
FIG. 13.

Movement in phase space of fifth to nine slice of the injected beam when the beam injection angle is varied from 4.4 mrad to 5.2 mrad in step of 0.2 mrad during injection in the uncompensated bump scheme. The vertical bars near x = 32 mm indicate the inner edge of the injection septum magnet. The phase space plots have been simulated by using the computer code RACETRACK.

Image of FIG. 14.
FIG. 14.

Beam current in the compensated bump scheme (the dipole ramp profile and accelerated current (DCCT signal, 100 mv/mA) are label in the figure). The peak value of the DCCT indicates injected beam current at 0.35 ms and flat top corresponding to the booster dipole flat top indicates the final accelerated beam current.

Image of FIG. 15.
FIG. 15.

Beam injection on the rising part of the septum pulse (Injected beam pulse, synchrotron injection septum, injection kicker are labelled in the figure).

Image of FIG. 16.
FIG. 16.

Synchrotron DCCT in uncompensated bump scheme. All injection kicker magnet current are set at 14.6 mrad kick. The peak value of the DCCT (calibration DCCT signal, 100 mv/mA) indicates injected beam current at 0.35 ms and flat top corresponding to the booster dipole flat top indicates the final accelerated beam current.

Image of FIG. 17.
FIG. 17.

Synchrotron DCCT in uncompensated bump scheme (Beam injection is performed on the rising part of the injection septum pulse). The peak value of the DCCT (calibration DCCT signal, 100 mv/mA) indicates injected beam current at 0.35 ms and flat top corresponding to the booster dipole flat top indicates the final accelerated beam current.

Image of FIG. 18.
FIG. 18.

Accelerated beam current with 60 ns injected beam pulse in the compensated and uncompensated bump schemes.

Tables

Generic image for table
Table I.

Parameters of the microtron.

Generic image for table
Table II.

Comparison between experiments and theoretical simulations of both injection schemes in terms of injected beam pulse length acceptance (T), accelerated beam current (I), and residual betatron oscillation amplitude (A) in a slice of 94 ns pulse length. Brackets in the columns of the two schemes denote the sequence number of the accepted slices.

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/content/aip/journal/rsi/84/8/10.1063/1.4817676
2013-08-13
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Studies of beam injection with a compensated bump and uncompensated bump in a synchrotron
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/8/10.1063/1.4817676
10.1063/1.4817676
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