Beam dynamics simulation with the use of macroparticle «PROTON» code in different variants of input dynamical matchers in a heavy ion high current RFQ structure
Beam dynamics simulations with the use of macroparticle method were performed for two cases of input dynamical matchers for RFQ. It is done a comparison with data obtained from the envelope equations. These simulation results are in agreement with other simulation and theoretical ones.
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2006
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| Цитувати: | Beam dynamics simulation with the use of macroparticle «PROTON» code in different variants of input dynamical matchers in a heavy ion high current RFQ structure / I.A. Vorobyov // Вопросы атомной науки и техники. — 2006. — № 2. — С. 151-153. — Бібліогр.: 7 назв. — англ. |
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irk-123456789-788702015-03-23T03:02:16Z Beam dynamics simulation with the use of macroparticle «PROTON» code in different variants of input dynamical matchers in a heavy ion high current RFQ structure Vorobyov, I.A. Линейные ускорители заряженных частиц Beam dynamics simulations with the use of macroparticle method were performed for two cases of input dynamical matchers for RFQ. It is done a comparison with data obtained from the envelope equations. These simulation results are in agreement with other simulation and theoretical ones. Численное исследование динамики пучка методом крупных частиц выполнено в двух вариантах входного динамического согласователя для ПОКФ. Сделано сравнение с данными, полученными по уравнениям для огибающих. Результаты численного моделирования находятся в соответствии с данными других расчётов. Чисельне дослідження динаміки пучка методом великіх часток виконано у двох варіантах вхідного динамічного узгоджувача для ПОКФ. Зроблено порівняння з даними, отриманими по рівняннях для обгинаючих. Результати чисельного моделювання відповідають даним інших розрахунків. 2006 Article Beam dynamics simulation with the use of macroparticle «PROTON» code in different variants of input dynamical matchers in a heavy ion high current RFQ structure / I.A. Vorobyov // Вопросы атомной науки и техники. — 2006. — № 2. — С. 151-153. — Бібліогр.: 7 назв. — англ. 1562-6016 PACS: 29.27.Bd http://dspace.nbuv.gov.ua/handle/123456789/78870 en Вопросы атомной науки и техники Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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English |
| topic |
Линейные ускорители заряженных частиц Линейные ускорители заряженных частиц |
| spellingShingle |
Линейные ускорители заряженных частиц Линейные ускорители заряженных частиц Vorobyov, I.A. Beam dynamics simulation with the use of macroparticle «PROTON» code in different variants of input dynamical matchers in a heavy ion high current RFQ structure Вопросы атомной науки и техники |
| description |
Beam dynamics simulations with the use of macroparticle method were performed for two cases of input dynamical
matchers for RFQ. It is done a comparison with data obtained from the envelope equations. These simulation results
are in agreement with other simulation and theoretical ones. |
| format |
Article |
| author |
Vorobyov, I.A. |
| author_facet |
Vorobyov, I.A. |
| author_sort |
Vorobyov, I.A. |
| title |
Beam dynamics simulation with the use of macroparticle «PROTON» code in different variants of input dynamical matchers in a heavy ion high current RFQ structure |
| title_short |
Beam dynamics simulation with the use of macroparticle «PROTON» code in different variants of input dynamical matchers in a heavy ion high current RFQ structure |
| title_full |
Beam dynamics simulation with the use of macroparticle «PROTON» code in different variants of input dynamical matchers in a heavy ion high current RFQ structure |
| title_fullStr |
Beam dynamics simulation with the use of macroparticle «PROTON» code in different variants of input dynamical matchers in a heavy ion high current RFQ structure |
| title_full_unstemmed |
Beam dynamics simulation with the use of macroparticle «PROTON» code in different variants of input dynamical matchers in a heavy ion high current RFQ structure |
| title_sort |
beam dynamics simulation with the use of macroparticle «proton» code in different variants of input dynamical matchers in a heavy ion high current rfq structure |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| publishDate |
2006 |
| topic_facet |
Линейные ускорители заряженных частиц |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/78870 |
| citation_txt |
Beam dynamics simulation with the use of macroparticle «PROTON» code in different variants of input dynamical matchers in a heavy ion high current RFQ structure / I.A. Vorobyov // Вопросы атомной науки и техники. — 2006. — № 2. — С. 151-153. — Бібліогр.: 7 назв. — англ. |
| series |
Вопросы атомной науки и техники |
| work_keys_str_mv |
AT vorobyovia beamdynamicssimulationwiththeuseofmacroparticleprotoncodeindifferentvariantsofinputdynamicalmatchersinaheavyionhighcurrentrfqstructure |
| first_indexed |
2025-07-06T02:58:17Z |
| last_indexed |
2025-07-06T02:58:17Z |
| _version_ |
1836864711129300992 |
| fulltext |
BEAM DYNAMICS SIMULATION WITH THE USE OF MACROPARTI-
CLE «PROTON» CODE IN DIFFERENT VARIANTS OF INPUT
DYNAMICAL MATCHERS IN A HEAVY ION HIGH CURRENT RFQ
STRUCTURE
I.A. Vorobyov
ITEP, Moscow, Russia
E-mail: vorobjev@itep.ru
Beam dynamics simulations with the use of macroparticle method were performed for two cases of input dynam-
ical matchers for RFQ. It is done a comparison with data obtained from the envelope equations. These simulation re-
sults are in agreement with other simulation and theoretical ones.
PACS: 29.27.Bd
1. INTRODUCTION
Beam dynamics simulations with the use of
macroparticle PROTON code [1] were performed for
two input dynamical matchers with different electrode
profiles for KV and Gauss initial particle distributions.
The first case, “RM37”, was optimized for a beam cur-
rent 55 mA and the second one, “IRM37-400”, was op-
timized for the current 400 mA. Both cases with
monotonous electrode profiles were developed with the
use of modernized ABC code [2,3] to provide reduced
slopes of input matched beam envelopes. The “IR-
M37-400” matcher provides almost constant value of
dynamical matching coefficient and low sensitivity to
difficult controlled initial site of a fringe field within a
wide range of beam currents.
The simulations were performed using 5000
macroparticles in one central bunch and two virtual
neighboring ones. Statistics includes 100% of the parti-
cles. Space charge forces were calculated with the use
of a particle-particle method and a fast two-level-tree al-
gorithm. Integration of motion equations was evaluated
by the Runge-Kutta scheme of 4-th order involving 200
steps of integration during one RF period. The testing
channel consists of 39 RFQ cells with 12 matching ones
and analytical set of field. The main parameters of .RFQ
[4] are shown in Table 1.
Table 1. Main parameters of RFQ-GSI
Ions U+4, U+3
Input beam current (U+4), mA 37
Input beam current (U+3), mA 18
Full beam current, mA 55
Beam charge neutralization in LEBT, % 100
Beam energy (U+4), keV/u 2.2
Full energy of ion (U+4), MeV 0.52
Input beam emittance, mm.mrad 330
2. BEAM DYNAMICS WITH
KV DISTRIBUTION
The results of beam dynamics simulation for initial
KV distributions are shown in Figs.1-4.
“IRM37” “IRM37-400”
Fig.1. Input emittances
Fig.2. Beam envelopes in plane X
Fig.3. Output emittances in plane X
Fig.4. Output emittances in plane Y
3. BEAM DYNAMICS WITH GAUSS DISTRI-
BUTION
The results of beam dynamics simulation for initial
Gauss distribution are shown in Fig.5-8 for “IRM37”
and “IRM37-400” matchers.
“IRM37” “IRM37-400”
Fig.5. Input emittances
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PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. 2006. № 2.
Series: Nuclear Physics Investigations (46), p.151-153.
151
Fig.6. Beam envelopes in plane X
Fig.7. Output emittances in plane X
Fig.8. Output emittances in plane Y
4. OUTPUT TWISS PARAMETERS
The parameters of beam emittance obtained from
simulations and matched parameters, calculated with the
use of ABC program, for both cases of dynamical
matchers are shown in Table 2 and Table 3. The match-
ing coefficients, calculated according to Kapchinsky
method [5], are shown in Table 4 and Table 5.
Table 2. Twiss parameters for IRM output
KV IRM37 IRM37-400 Matched
αx 2.254 1.771 1.90
αy -1.397 -1.539 -1.90
βx 0.003882 0.003569 0.00421
βy 0.003697 0.003395 0.00421
Table 3. Twiss parameters for IRM output
Gauss IRM37 IRM37-400 Matched
αx 3.607 2.417 1.90
αy -1.301 -1.237 -1.90
βx 0.005606 0.004135 0.00421
βy 0.004760 0.003751 0.00421
Table 4. Input matching coefficients
Units IRM37 IRM37-400
k x k y k x k y
KV 1.170 1.173 1.170 1.173
Gauss 1.040 1.008 1.040 1.008
Table 5. Output matching coefficients
Units IRM37 IRM37-400
k x k y k x k y
KV 1.686 1.372 1.271 1.240
Gauss 2.564 2.194 1.732 1.636
Current density is generated up to ≈780 mA/cm⋅
mrad for KV beam and ≈1990 mA/cm⋅mrad for Gauss
beam. Required current rms density is 768 mA/cm⋅
mrad.
The results from PROTON code simulations are in
agreement with the results obtained by DYNAMION
code [6,7] and other theoretical data.
5. EMITTANCE GROWTH AND BEAM
TRANSMISSION
The results for rms emittances and beam losses, ob-
tained from beam dynamics simulation for initial KV
and Gauss distributions are shown in Figs.9-12 for “IR-
M37” and “IRM37-400” matchers. The dependences of
beam transmission and output beam current on input
beam current for “IRM37” and “IRM37-400” matchers
for KV beam are shown in Fig.13 and Fig.14.
Fig.9. Normalized rms emittances in plane X for “IR-
M37” matcher
Fig.10. Normalized rms emittances in plane X for
“IRM37-400” matcher
Fig.11. Beam transmission for “IRM37” matcher
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PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. 2006. № 2.
Series: Nuclear Physics Investigations (46), p.151-153.
151
Fig.12. Beam transmission for “IRM37-400” matcher
Fig.13. Dependences of beam transmissions on input
beam current for “IRM37” and “IRM37-400” matchers
for KV beam
Fig.14. Dependences of output beam currents on input
beam current for “IRM37” and “IRM37-400” matches
for KV beam
6. CONCLUSION
The beam dynamics simulations with the use of the
macroparticle method and the PROTON code were per-
formed for two cases of input dynamical matchers for
RFQ for KV and Gauss beams. The comparison with
data obtained from the envelope equations and by DY-
NAMION code simulations, has shown that the results
from simulations with the use of PROTON code are in
agreement with others. Twiss parameters for KV beam
are close to the theoretical values calculated for a beam
current of 55 mA. To obtain better agreement between
calculated and theoretical data, a special procedure for
initial particle distribution generation is required. This
procedure will provide exact initial matching conditions
according to required current density and investigations
of beam matching for different initial distributions. The
second case of matcher, optimized for beam current of
400 mA, has improved dynamics for all the parameters
under investigation including reduced sensitivity for ini-
tial particle distributions with respect to the first case.
Further improvement of beam dynamics in high current
region requires special optimization procedure for re-
ducing emittance growth and particles losses, which
may be realized by joining ABC and PROTON codes
into one program.
REFERENCES
1. V.N. Lyachovitsky, E.S.Galpern, I.A.Vorobyov,
O.S.Sergeeva. Program PROTON. Information
fond of algorithms and programs on accelerator
theme. AS and Minatom RF, M., 1992, p.171.
2. I.A. Vorobyov. Program ABC. Information fond of
algorithms and programs on accelerator theme. AS
and Minatom RF, M., 1992, p.159.
3. I.A. Vorobyov. Analytical law for focusing rigidity
and calculation with use of optimizing ABC code of
dynamical unmodulated matcher with reduced
slope of beam envelope at the RFQ entrance.
Preprint ITEP. 2005, 8-05.
4. JW. Barth, L. Dahl, J. Glatz et al. Achievements of
the High Current Beam Performance of the GSI
Unilac. Proc. of EPAC04, Lucern. 2004, p.1171.
5. I.M.Kapchinsky. Theory of Linear Resonance Ac-
celerators. M.: “Energoizdat”, 1982.
6. A.A. Kolomiets, V.I. Pershin, I.A. Vorobyov et al.
DYNAMION – The Code for Beam Dynamics Simu-
lations in High Current Ion Linac. Proc. of
EPAC98. 1998, p.1201-1203.
7. J. Klabunde, W. Barth, A. Kolomiets, S. Yarami-
shev. Beam Dynamics Simulations for the GSI High
Current Injector with the New Versatile Computer
Code DYNAMION. Proc. of PAC01, Chicago.
2001, p.2899-3001.
ЧИСЛЕННОЕ ИССЛЕДОВАНИЕ ДИНАМИКИ ПУЧКА МЕТОДОМ КРУПНЫХ ЧАСТИЦ С ИС-
ПОЛЬЗОВАНИЕМ ПРОГРАММЫ «PROTON» В РАЗЛИЧНЫХ ВАРИАНТАХ ВХОДНОГО
ДИНАМИЧЕСКОГО СОГЛАСОВАТЕЛЯ В ТЯЖЕЛОИОННОЙ
СИЛЬНОТОЧНОЙ СТРУКТУРЕ ПОКФ
И.А.Воробьёв
Численное исследование динамики пучка методом крупных частиц выполнено в двух вариантах входно-
го динамического согласователя для ПОКФ. Сделано сравнение с данными, полученными по уравнениям
для огибающих. Результаты численного моделирования находятся в соответствии с данными других рас-
чётов.
ЧИСЕЛЬНЕ ДОСЛІДЖЕННЯ ДИНАМІКИ ПУЧКА МЕТОДОМ ВЕЛИКИХ ЧАСТОК
З ВИКОРИСТАННЯМ ПРОГРАМИ «PROTON» У РІЗНИХ ВАРІАНТАХ ВХІДНОГО
ДИНАМІЧНОГО УЗГОДЖУВАЧА У ВАЖКОІОННІЙ ПОТУЖНОСТРУМОВІЙ СТРУКТУРІ ПОКФ
І.А.Воробйов
Чисельне дослідження динаміки пучка методом великіх часток виконано у двох варіантах вхідного
динамічного узгоджувача для ПОКФ. Зроблено порівняння з даними, отриманими по рівняннях для
обгинаючих. Результати чисельного моделювання відповідають даним інших розрахунків.
144
численное исследование динамики пучка методом крупных частиц с использованием программы «PROTON» в различных вариантах входного динамического согласователя в тяжелоионной
сильноточной структуре покф
Чисельне дослідження динаміки пучка методом великіх часток виконано у двох варіантах вхідного динамічного узгоджувача для ПОКФ. Зроблено порівняння з даними, отриманими по рівняннях для обгинаючих. Результати чисельного моделювання відповідають даним інших розрахунків.
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