Paper | Title | Other Keywords | Page |
---|---|---|---|
TUA03 | New Time Structures Available at the HZB Cyclotron | cyclotron, proton, extraction, ion | 130 |
|
|||
While most of the beam time of the cyclotron is used for proton therapy of ocular melanomas, an increasing amount of beam time is used for experiments. In response to a growing demand on time structures a new pulse suppressor was developed. This was necessary as our cyclotron was originally designed for heavy ions, thus limiting us to repetition rates of 75 kHz for light ions. The pulse suppression is now accomplished completely on the low-energy side, making the pulse suppressor on the high energy side, which was needed for single pulses, superfluous. With this new pulse suppressor the repetition rate of the pulse may be varied from 2 MHz down to 1 Hz or less. The pulse length can be freely chosen from a quasi-continuous beam to single pulses with a pulse width less than 1 ns. The pulses are measured either with a specially developed Faraday cup or non-destructively with a pick-up. The extraction of single pulses surveys very precisely if single turn extraction is achieved. The set-up of the pulse suppressor, measurements on the time structures for various beams and examples of their experimental use will be presented. | |||
![]() |
Slides TUA03 [3.956 MB] | ||
Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||
TUP12 | High Accuracy Cyclotron Beam Energy Measurement using Cross-correlation Method | cyclotron, proton, experiment, real-time | 193 |
|
|||
Funding: This project was supported by the NSTIP strategic technologies program in the kingdom. Award No. (14-MAT-1233-20) This work discusses a method to measure the protons energy from the CS 30 Cyclotron at KFSHRC. Using two Fast Current Transformers (FCT), particles' Time of Flight (ToF) can be accurately determined by using windowed cross-correlation method. Existing techniques use pulse width or edge delay measurement to get the ToF. The accuracy of these methods, however, is limited by sampling rate, signal level, noise, and distortion. By using Cross-Correlation and interpolation, on the other hand, a fractional delay measurement can be obtained, and the system works with low level signals, i.e. high S/N ratio. During experiments, time delay measured between the two signals was 9.4023 ns. By using relativistic equations cyclotron energy was calculated and found to be 25.99 MeV, bearing in mind that cyclotron energy (mentioned in the CS30 manual) is 26.5 MeV for protons. The difference between actual and calculated energy was <2%. Results will be further discussed and analyzed. S. Varnasseri et al., "Test Bench Experiments for Energy Measurement and Beam Loss of ESS-BILBAO", Proceedings of IBIC2013, Oxford, UK, 2013. |
|||
Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||
THP14 | Design of RF Pick-up for the Cyclotron | cavity, cyclotron, resonance, simulation | 336 |
|
|||
The radio-frequency (RF) pick-up for RFT-30 cyclotron which was located in the Korea Atomic Energy Research Institute (KAERI) was designed by Sungkyunkwan University in Korea. This paper covers proper position of RF pick-up and things to consider when designing. Our RF pick-up antenna is designed for RFT-30, but approach to design process can be used any RF pick-up antenna design. This paper provide some tendency graph according to position of RF pick-up. | |||
![]() |
Poster THP14 [2.010 MB] | ||
Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||
THP18 | Suppression of RF Radiation Originating from the Flattop Cavity in the PSI Ring Cyclotron | cavity, flattop, vacuum, cyclotron | 348 |
|
|||
In the PSI Ring cyclotron, protons are accelerated from 72 MeV to 590 MeV. In several upgrade programs, the beam current was increased from the initial design value of 100 μA up to 2.4 mA. The rf-system of this separated sector cyclotron consists of 4 copper cavities running at 50 MHz for the main acceleration. For the purpose of increasing the phase acceptance of the Ring, an aluminum flattop cavity is operated at a gap voltage of 555 kVp at the 3rd harmonic frequency. As a result of the progressively increased flattop voltage, this cavity was pushed toward its mechanical and electrical limits. As a consequence rf-power is leaking into the cyclotrons vacuum chamber, which in turn caused several problems. A visible effect was the formation of plasma in the vacuum chamber *. In the last shutdown, an attempt was made to reduce the radiated rf-power. On the vacuum sealing between the flattop cavity and sector magnet 6, a shim was installed which reduces the gap for the beam from 60mm to 25mm in height. Results of this intervention will be presented and compared with finite element model simulations **.
* N.J. Pogue et al. NIM-A: Volume 821, 11 June 2016, pp. 87 - 92. ** N.J. Pogue et al. NIM-A: Volume 828, 21 August 2016, pp. 156 - 162. |
|||
Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||