CA1063243A - Feed system for a particle accelerator and a radio-therapy apparatus using this system - Google Patents
Feed system for a particle accelerator and a radio-therapy apparatus using this systemInfo
- Publication number
- CA1063243A CA1063243A CA257,646A CA257646A CA1063243A CA 1063243 A CA1063243 A CA 1063243A CA 257646 A CA257646 A CA 257646A CA 1063243 A CA1063243 A CA 1063243A
- Authority
- CA
- Canada
- Prior art keywords
- accelerator
- generator
- transformer
- situated
- pulse generator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/02—Circuits or systems for supplying or feeding radio-frequency energy
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Particle Accelerators (AREA)
- Radiation-Therapy Devices (AREA)
Abstract
A FEED SYSTEM FOR A PARTICLE ACCELERATOR
AND A RADIO-THERAPY APPARATUS USING THIS SYSTEM
Abstract of the Disclosure A system for supplying pulsed high voltage and hyper-frequency energy by means of a single pulse generator G
to a particle accelerator A situated at a great distance from the generator G, the deformation of the pulses applied to said accelerator being negligible. This system comprises a pulse generator G, a step up voltage transformer T1 situated in the vicinity of the accelerator A, the primary of the transformer T1 being connected to the generator G
by means of a coaxial cable L of predetermined length, a variable resistor R enabling the shape of the pulses applied to the accelerator to be corrected. Another transformer T2 can supply the pulsed high voltage to the hyperfrequency generator K delivering the HF energy to the accelerator sections of the accelerator A.
AND A RADIO-THERAPY APPARATUS USING THIS SYSTEM
Abstract of the Disclosure A system for supplying pulsed high voltage and hyper-frequency energy by means of a single pulse generator G
to a particle accelerator A situated at a great distance from the generator G, the deformation of the pulses applied to said accelerator being negligible. This system comprises a pulse generator G, a step up voltage transformer T1 situated in the vicinity of the accelerator A, the primary of the transformer T1 being connected to the generator G
by means of a coaxial cable L of predetermined length, a variable resistor R enabling the shape of the pulses applied to the accelerator to be corrected. Another transformer T2 can supply the pulsed high voltage to the hyperfrequency generator K delivering the HF energy to the accelerator sections of the accelerator A.
Description
The modulator used for supplying pulsed high voltage to the hyperfrequency generator (for example Klystron or magnetron) delivering high frequency energy to the accelerator cavities of a charged particle accelerator, generally supplies the accelerator itself with pulsed high voltage, an additional winding or a branch being provided for this purpose in the secondary of the ~IT trans-former situated downstream of the modulator.
But, particle sources (for example electron guns) repre-sents high-impedance charges which, in some cases, are of necessity situated fairly far from the high tension winding of the transfor-mer, as is the case for example with certain radio-therapy appa-ratus.
The high frequency generator is normally situated in the vicinity of the modulator and the step-up voltage transformer, whereas the accelerator, situated at a distance of several metres from this HT transformer, receives the pulsed high voltage through a transmission line of considerable length which is situated bet-ween the secondary of the HT transformer and the accelerator, generally being associated with a resistance of low value connec-ted in parallel and having a high power consumption compared withthe power consumption of the HF generator. In addition, the capacitance carried back by the transmission line to the level of the primary winding of the HT transformer is of high value.
The system for feeding an accelerator according to the invention enables these disadvantages to be obviated.
According to the invention, there is provided a feed system for feeding a particle accelerator, said system comprising a low impedance pulse generator situated at a distance from said accelerator, a step up voltage transformer having a primary winding and a secondary winding for supplying a pulse high voltage to said accelerator and means for injecting a high frequency energy lnto said accelerator, said transformer, situated in the vicinity of ~063243 said accelerator, having said secondary winding connected to said accelerator by means of a short connection and said primary wind-ing connected to the pulse generator by means of a transmission line of predetermined length, adjustable matching means being provided upstream of said transmission line for suitably matching said pulse generator and obtaining suitable pulses at the output end of said first transformer.
For the better understanding of the invention and to show how the same may be carried into effect, reference will be made to the drawing accompanying the ensuing description.
The single figure shows a feed system according to the invention for an accelerator A, this system comprising a pulse generator G and a first step up voltage transformer Tl situated in the vicinity of the accelerator A. The primary winding of the transformer Tl is connected to the pulse generator G by a conven-tional coaxial cable L having an impedance of 50 or 75 ohms for example and a predetermined length (for example approximately 10 metres) and the secondary winding is connected to the electron gun CA of the accelerator A. An adjustable matching system Sa is arranged between the pulse generator G and the input end of the coaxial cable L. This adjustable matching system Sa may be a variable resistor connected in serie$ and having adjustable values between 50 and 100 ohms for example. The resistance value is adjusted for suitably loading the pulse generator G and obtaining undistorted pulses at the output end of the transformer Tl, this adjustable matching systèm Sa being able to correct the pulse distorsions introduced by the coaxial line L and the windings of the transformer Tl. The HF energy injected into the accelerator A is supplied by a hyperfrequency generator K which may be suppli~
with high voltage by another step up voltage transformer T2 f which the primary winding is connected to the pulse generator G
whilst its secondary high tension winding is connected to the _ 3 _ ~,j .
~063243 hyperfrequency ~enerator K, the pulsed high voltage being applied to the gun CK of the generator K (for example a klystron). A
hyperfrequency connecting line g enables the HF energy supplied by the klystron K to be injected into the accelerator sections of the accelerator A.
The feed system according to the invention may be used with advantage in medical radio-therapy apparatus comprising a particle accelerator A situated in the vicinity of the irradiation head, i.e. at a fairly considerable distance from the pulse gene-rator. I
But, particle sources (for example electron guns) repre-sents high-impedance charges which, in some cases, are of necessity situated fairly far from the high tension winding of the transfor-mer, as is the case for example with certain radio-therapy appa-ratus.
The high frequency generator is normally situated in the vicinity of the modulator and the step-up voltage transformer, whereas the accelerator, situated at a distance of several metres from this HT transformer, receives the pulsed high voltage through a transmission line of considerable length which is situated bet-ween the secondary of the HT transformer and the accelerator, generally being associated with a resistance of low value connec-ted in parallel and having a high power consumption compared withthe power consumption of the HF generator. In addition, the capacitance carried back by the transmission line to the level of the primary winding of the HT transformer is of high value.
The system for feeding an accelerator according to the invention enables these disadvantages to be obviated.
According to the invention, there is provided a feed system for feeding a particle accelerator, said system comprising a low impedance pulse generator situated at a distance from said accelerator, a step up voltage transformer having a primary winding and a secondary winding for supplying a pulse high voltage to said accelerator and means for injecting a high frequency energy lnto said accelerator, said transformer, situated in the vicinity of ~063243 said accelerator, having said secondary winding connected to said accelerator by means of a short connection and said primary wind-ing connected to the pulse generator by means of a transmission line of predetermined length, adjustable matching means being provided upstream of said transmission line for suitably matching said pulse generator and obtaining suitable pulses at the output end of said first transformer.
For the better understanding of the invention and to show how the same may be carried into effect, reference will be made to the drawing accompanying the ensuing description.
The single figure shows a feed system according to the invention for an accelerator A, this system comprising a pulse generator G and a first step up voltage transformer Tl situated in the vicinity of the accelerator A. The primary winding of the transformer Tl is connected to the pulse generator G by a conven-tional coaxial cable L having an impedance of 50 or 75 ohms for example and a predetermined length (for example approximately 10 metres) and the secondary winding is connected to the electron gun CA of the accelerator A. An adjustable matching system Sa is arranged between the pulse generator G and the input end of the coaxial cable L. This adjustable matching system Sa may be a variable resistor connected in serie$ and having adjustable values between 50 and 100 ohms for example. The resistance value is adjusted for suitably loading the pulse generator G and obtaining undistorted pulses at the output end of the transformer Tl, this adjustable matching systèm Sa being able to correct the pulse distorsions introduced by the coaxial line L and the windings of the transformer Tl. The HF energy injected into the accelerator A is supplied by a hyperfrequency generator K which may be suppli~
with high voltage by another step up voltage transformer T2 f which the primary winding is connected to the pulse generator G
whilst its secondary high tension winding is connected to the _ 3 _ ~,j .
~063243 hyperfrequency ~enerator K, the pulsed high voltage being applied to the gun CK of the generator K (for example a klystron). A
hyperfrequency connecting line g enables the HF energy supplied by the klystron K to be injected into the accelerator sections of the accelerator A.
The feed system according to the invention may be used with advantage in medical radio-therapy apparatus comprising a particle accelerator A situated in the vicinity of the irradiation head, i.e. at a fairly considerable distance from the pulse gene-rator. I
Claims (3)
1. A feed system for feeding a particle accelerator, said system comprising a low impedance pulse generator situated at a distance from said accelerator, a step up voltage transformer having a primary winding and a secondary winding for supplying a pulse high voltage to said accelerator and means for injecting a high frequency energy into said accelerator, said transformer, situated in the vicinity of said accelerator, having said secon-dary winding connected to said accelerator by means of a short connection and said primary winding connected to the pulse gene-rator by means of a transmission line of predetermined length, adjustable matching means being provided upstream of said trans-mission line for suitably matching said pulse generator and obtaining suitable pulses at the output end of said first trans-former.
2. A feed system as claimed in claim 1, wherein said pulse generator is associated with a second step up voltage trans-former which enables a pulsed high voltage to be supplied to a high frequency generator for delivering the high frequency energy to said accelerator.
3. A feed system as claimed in claim 1, wherein said adjustable matching means comprise a variable resistor.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7523141A FR2319272A1 (en) | 1975-07-24 | 1975-07-24 | POWER SUPPLY DEVICE FOR A PARTICLE ACCELERATOR AND RADIOTHERAPY DEVICE USING SUCH A DEVICE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1063243A true CA1063243A (en) | 1979-09-25 |
Family
ID=9158318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA257,646A Expired CA1063243A (en) | 1975-07-24 | 1976-07-23 | Feed system for a particle accelerator and a radio-therapy apparatus using this system |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5216000A (en) |
| CA (1) | CA1063243A (en) |
| DE (1) | DE2632726A1 (en) |
| FR (1) | FR2319272A1 (en) |
| GB (1) | GB1530524A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011086551B4 (en) | 2011-11-17 | 2023-02-23 | Siemens Healthcare Gmbh | Flexible impedance matching for a pulse current supplied microwave generator |
| GB2567620A (en) * | 2017-10-10 | 2019-04-24 | Teledyne E2V Uk Ltd | Microwave generation |
-
1975
- 1975-07-24 FR FR7523141A patent/FR2319272A1/en active Granted
-
1976
- 1976-07-21 GB GB3047776A patent/GB1530524A/en not_active Expired
- 1976-07-21 DE DE19762632726 patent/DE2632726A1/en active Pending
- 1976-07-23 JP JP8805876A patent/JPS5216000A/en active Pending
- 1976-07-23 CA CA257,646A patent/CA1063243A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2319272B1 (en) | 1977-12-09 |
| JPS5216000A (en) | 1977-02-05 |
| GB1530524A (en) | 1978-11-01 |
| FR2319272A1 (en) | 1977-02-18 |
| DE2632726A1 (en) | 1977-02-17 |
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