An interactive procedure of a transverse beam matching and correction in INR Linac
An application package is developed to carry out an interactive procedure for a transverse beam matching and correction in INR Linac. The results of multiple beam profile measurements in several accelerator areas are used. The currents in steering coils are found to suppress the beam displacement....
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| Zitieren: | An interactive procedure of a transverse beam matching and correction in INR Linac / S.E. Bragin, A.V. Feschenko, O.V. Grekhov, N.F. Lebedeva, V.N. Mikhailov, A.N. Mirzojan, V.A. Moiseev, O.M. Volodkevich // Вопросы атомной науки и техники. — 2006. — № 3. — С. 116-118. — Бібліогр.: 2 назв. — англ. |
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irk-123456789-798622015-04-06T03:01:55Z An interactive procedure of a transverse beam matching and correction in INR Linac Bragin, S.E. Feschenko, A.V. Grekhov, O.V. Lebedeva, N.F. Mikhailov, V.N. Mirzojan, A.N. Moiseev, V.A. Volodkevich, O.M. Ускорители заряженных частиц An application package is developed to carry out an interactive procedure for a transverse beam matching and correction in INR Linac. The results of multiple beam profile measurements in several accelerator areas are used. The currents in steering coils are found to suppress the beam displacement. The gradients in quadrupole lenses are calculated to match the beam. This procedure is successfully used in accelerator tuning. Разработан пакет программ для проведения интерактивной процедуры поперечного согласования и коррекции пучка по результатам измерения профилей пучка на различных участках линейного ускорителя ИЯИ РАН. Определяются режимы включения корректирующих элементов для выведения пучка на ось ускорителя и градиенты полей квадрупольных линз для согласования пучка с фокусирующим каналом ускорителя. Разработанная процедура успешно используется при настройке режимов работы ускорителя. Розроблено пакет програм для проведення інтерактивної процедури поперечного узгодження і корекції пучка за результатами виміру профілів пучка на різних ділянках лінійного прискорювача ІЯД РАН. Визначаються режими включення коригувальних елементів для виведення пучка на вісь прискорювача і градієнти полів квадрупольних лінз для узгодження пучка з фокусуючим каналом прискорювача. Розроблена процедура успішно використається при настроюванні режимів роботи прискорювача. 2006 Article An interactive procedure of a transverse beam matching and correction in INR Linac / S.E. Bragin, A.V. Feschenko, O.V. Grekhov, N.F. Lebedeva, V.N. Mikhailov, A.N. Mirzojan, V.A. Moiseev, O.M. Volodkevich // Вопросы атомной науки и техники. — 2006. — № 3. — С. 116-118. — Бібліогр.: 2 назв. — англ. 1562-6016 PACS: 29.27.Eg http://dspace.nbuv.gov.ua/handle/123456789/79862 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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| language |
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Ускорители заряженных частиц Ускорители заряженных частиц |
| spellingShingle |
Ускорители заряженных частиц Ускорители заряженных частиц Bragin, S.E. Feschenko, A.V. Grekhov, O.V. Lebedeva, N.F. Mikhailov, V.N. Mirzojan, A.N. Moiseev, V.A. Volodkevich, O.M. An interactive procedure of a transverse beam matching and correction in INR Linac Вопросы атомной науки и техники |
| description |
An application package is developed to carry out an interactive procedure for a transverse beam matching and
correction in INR Linac. The results of multiple beam profile measurements in several accelerator areas are used.
The currents in steering coils are found to suppress the beam displacement. The gradients in quadrupole lenses are
calculated to match the beam. This procedure is successfully used in accelerator tuning. |
| format |
Article |
| author |
Bragin, S.E. Feschenko, A.V. Grekhov, O.V. Lebedeva, N.F. Mikhailov, V.N. Mirzojan, A.N. Moiseev, V.A. Volodkevich, O.M. |
| author_facet |
Bragin, S.E. Feschenko, A.V. Grekhov, O.V. Lebedeva, N.F. Mikhailov, V.N. Mirzojan, A.N. Moiseev, V.A. Volodkevich, O.M. |
| author_sort |
Bragin, S.E. |
| title |
An interactive procedure of a transverse beam matching and correction in INR Linac |
| title_short |
An interactive procedure of a transverse beam matching and correction in INR Linac |
| title_full |
An interactive procedure of a transverse beam matching and correction in INR Linac |
| title_fullStr |
An interactive procedure of a transverse beam matching and correction in INR Linac |
| title_full_unstemmed |
An interactive procedure of a transverse beam matching and correction in INR Linac |
| title_sort |
interactive procedure of a transverse beam matching and correction in inr linac |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| publishDate |
2006 |
| topic_facet |
Ускорители заряженных частиц |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/79862 |
| citation_txt |
An interactive procedure of a transverse beam matching and correction in INR Linac / S.E. Bragin, A.V. Feschenko, O.V. Grekhov, N.F. Lebedeva, V.N. Mikhailov, A.N. Mirzojan,
V.A. Moiseev, O.M. Volodkevich
// Вопросы атомной науки и техники. — 2006. — № 3. — С. 116-118. — Бібліогр.: 2 назв. — англ. |
| series |
Вопросы атомной науки и техники |
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| fulltext |
AN INTERACTIVE PROCEDURE OF A TRANSVERSE BEAM MATCH-
ING AND CORRECTION IN INR LINAC
S.E. Bragin, A.V. Feschenko, O.V. Grekhov, N.F. Lebedeva, V.N. Mikhailov, A.N. Mirzojan,
V.A. Moiseev, O.M. Volodkevich
Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia
E-mail: bragin@inr.ru
An application package is developed to carry out an interactive procedure for a transverse beam matching and
correction in INR Linac. The results of multiple beam profile measurements in several accelerator areas are used.
The currents in steering coils are found to suppress the beam displacement. The gradients in quadrupole lenses are
calculated to match the beam. This procedure is successfully used in accelerator tuning.
PACS: 29.27.Eg
1. INTRODUCTION
The Linac of Institute for Nuclear Research of the
Russian Academy of Sciences (INR) is a high intensity
accelerator [1]. Therefore, it is important to achieve op-
timal beam transportation throughout the accelerator
with minimum beam losses.
There are five areas in the high energy accelerator
part (above 100 MeV) where the measurements are
done to observe and to adjust beam characteristics.
2. INSTRUMENTATION
Transverse behavior of the beam is monitored by
wire scanners. From three to five wire scanners are in-
stalled in each measuring area of the accelerator. The
scanner consists of two perpendicular wires, which are
parallel to horizontal and vertical axes. The two-wire as-
sembly is moved across the beam by a step motor. Scan-
ning is made through the whole accelerator channel
aperture in the range of ±20 mm. A scan step is set by
an operator and can be equal to 0.5, 1 or 2 mm. The du-
ration of measuring cycle depends on a number of scan-
ners used and is about 10…15 minutes. Processing of
experimental profiles (Fig.1) gives rms size of the beam
and position of the beam centre for both transverse
planes. These data along with information on focusing
structure of the measuring area are further used for data
treatment.
Fig.1. Example of beam profile measurement
3. TREATMENT OF PROFILE MEASURE-
MENTS
The results of rms beam size and the beam centre
measurements in the point of wire scanner longitudinal
location for each phase plane represent vertical lines.
The disposition of these lines can be transferred to an
arbitrary point of measuring area by a matrix transfor-
mation.
The results of measurements with several scanners
transferred to a selected position represent a set of lines.
The phase ellipse is inscribed with the iteration algo-
rithm in central part of the phase space separated by the
lines, the sum of distances for all the lines to the ellipse
being minimized (Fig.2).
The parameters of phase ellipses αx, βx, γx, αy, βy, γy
and the emittances εx and εy are calculated in rms mean-
ing for any point of interest. Below the results of treat-
ment of measurements are presented for a 100 MeV
INR Linac measuring area.
Fig.2. The inscribed beam phase ellipses related to the
entrance of the measuring area at 100 MeV region
____________________________________________________________
PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. 2006. № 3.
Series: Nuclear Physics Investigations (47), p.116-118.116
The method mentioned above has computational er-
rors in determination of the ellipse parameters which de-
pend on mutual disposition of the lines. To decrease
these errors, a procedure is carried out for several points
along the measuring area. Then the parameters of all the
ellipses are transformed to the point of interest by the
matrix transformation and the mean values of the pa-
rameters are calculated. For example, the parameters at
the entrance of the 100 MeV measuring area are the fol-
lowing:
βx =1.01±0.03 mm/mrad; βy =1.48±0.04 mm/mrad;
αx =-1.22±0.04; αy =0.24±0.04;
εx=0.63±0.01 mm⋅mrad; εy =0.66±0.01 mm⋅mrad
The errors shown represent procedural errors of the
method and are only the part of the total errors.
Similarly one can get a series of transformed straight
lines for a beam centre. Ideally, an intersection point of
these lines is a beam centre in a phase space. Normally,
due to errors, all the lines do not intersect in one point,
so the point of beam centre is found by minimizing the
sum of distances to all the lines (Fig.3). Similarly to the
procedural errors for ellipse parameters there are proce-
dural errors for centre determination and the values re-
lated to Fig.3 are:
Xcentre= -0.13±0.17 mm; Ycentre=0.50±0.14 mm;
X′centre= -0.16±0.31 mrad; Y′centre=-0.80±0.18 mrad
Fig.3. Determination of the beam centre for the en-
trance of the measuring area at 100 MeV region
Fig.4. Lattice (a) and tracing of the β -function before (b) and after (c) matching procedure
Fig.5. Tracing of the beam centre before and after correction (first step of procedure)
4. MATCHING PROCEDURE
Reconstruction of transverse beam phase ellipses
and determination of the beam centers in an arbitrary
longitudinal point is necessary for the subsequent proce-
dure of beam matching and correction. The elements of
focusing structure and wire scanners for 100 MeV mea-
suring area are shown in Fig.4,a. The tracing of the
found phase space ellipse parameters along the measur-
ing area is presented in Fig.4,b. To minimize the beam
size, a specially developed matching algorithm is used.
The gradients in the first four quadrupoles (for
100 MeV area) or quadrupole doublet assemblies (for
other measuring areas) are varied to match the entrance
beam parameters found by the method mentioned above
with the downstream accelerator structure. After
____________________________________________________________
PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. 2006. № 3.
Series: Nuclear Physics Investigations (47), p.116-118.117
selection and setting the values of gradients the profile
measurements are repeated. Fig.4,c shows a behavior of
the beam after proper matching. Sometimes the match-
ing procedure must be iterated several times for better
results.
5. BEAM CENTRE CORRECTION
There are additional windings in the quadrupoles to
produce an additional dipole field for beam steering.
Two steering elements for each plane are used in each
measuring area. A standard correction procedure [2] en-
ables to suppress displacement and angle of the beam at
the exit of the second steering element in both horizon-
tal and vertical planes.
The correction procedure is carried out after comple-
tion of the procedure of beam matching.
The steering currents are calculated with a separate
code. Fig.5 demonstrates a behavior of beam centre
throughout the measuring area before and after correc-
tion.
To estimate the correction efficiency a special pa-
rameter was introduced. It is determined as an rms devi-
ation of the beam centre from the ideal axis averaged
over the measuring area. Fig.5 demonstrates an im-
provement of beam behavior after the first step of cor-
rection. The parameters defined above are Xcen-
rms=0.95 mm, Ycenrms=1.81 mm before correction and
Xcenrms=0.87 mm, Ycenrms=0.70 mm after correction.
To improve the accuracy several iterations are required
though further studies are necessary.
6. CONCLUSION
All the algorithms mentioned above are included to
the application package. The method has been tested at
a 100 MeV region and is planned to use in all the mea-
suring areas of INR Linac. This application package is
developed for interactive analysis and control of trans-
verse beam parameters. Effective beam matching and
correction are achieved in the first experiment.
REFERENCES
1. B.P. Murin et al. Ion Linear Accelerators. M.: «At-
omizdat», 1978.
2. I.N. Biryukov, A.N.Mirzojan et al. Investigation of
Transverse Beam Dynamics at the INR Linac. INR
Report, 1991.
ИНТЕРАКТИВНАЯ ПРОЦЕДУРА ПОПЕРЕЧНОГО СОГЛАСОВАНИЯ И КОРРЕКЦИИ ПУЧКА
НА ЛИНЕЙНОМ УСКОРИТЕЛЕ ИЯИ РАН
С.Е. Брагин, А.В. Фещенко, О.В. Грехов, Н.Ф. Лебедева, В.Н. Михайлов, А.Н. Мирзоян, В.А. Моисеев,
О.М. Володкевич
Разработан пакет программ для проведения интерактивной процедуры поперечного согласования и кор-
рекции пучка по результатам измерения профилей пучка на различных участках линейного ускорителя ИЯИ
РАН. Определяются режимы включения корректирующих элементов для выведения пучка на ось ускорите-
ля и градиенты полей квадрупольных линз для согласования пучка с фокусирующим каналом ускорителя.
Разработанная процедура успешно используется при настройке режимов работы ускорителя.
ІНТЕРАКТИВНА ПРОЦЕДУРА ПОПЕРЕЧНОГО УЗГОДЖЕННЯ І КОРЕКЦІЇ ПУЧКА
НА ЛІНІЙНОМУ ПРИСКОРЮВАЧІ ІЯД РАН
С.Є. Брагін, А.В. Фещенко, О.В. Грєхов, Н.Ф. Лебедева, В.Н. Міхайлов, А.Н. Мірзоян, В.А. Моисєєв,
О.М. Володкевич
Розроблено пакет програм для проведення інтерактивної процедури поперечного узгодження і корекції
пучка за результатами виміру профілів пучка на різних ділянках лінійного прискорювача ІЯД РАН.
Визначаються режими включення коригувальних елементів для виведення пучка на вісь прискорювача і
градієнти полів квадрупольних лінз для узгодження пучка з фокусуючим каналом прискорювача.
Розроблена процедура успішно використається при настроюванні режимів роботи прискорювача.
118
Интерактивная процедура поперечного согласования и коррекции пучка на линейном ускорителе ИЯИ РАН
ІНТЕРАКТИВНА ПРОЦЕДУРА ПОПЕРЕЧНОГО УЗГОДЖЕННЯ І КОРЕКЦІЇ ПУЧКА НА ЛІНІЙНОМУ ПРИСКОРЮВАЧІ ІЯД РАН
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