33.7
                MHz
           heavy-ion radio frequency quadrupole linac at VECC Kolkata

Naik, Vaishali; Dechoudhury, Siddhartha; Bandyopadhyay, Arup; Mondal, Manas; Pandey, H.K.; Roy, Tufan; Sanyal, Dirtha; Bhowmick, Debasis

doi:10.1063/1.2727457

Cited by 8 publications

(5 citation statements)

References 4 publications

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“…Figure 5 shows the measured frequency shift vs rotation of loop and compared with analytical results. The design of a loop type coupler and inductive tuner for RFQ cavity has been successfully developed and low power tests has been done from VNA the measured value is quite (3) close to the analytically estimated value. The loop coupler successfully delivered the power to RFQ cavity from RF amplifier and tested up to 4 KW continues power and 11 KW pulsed power with 30% duty cycle.…”

Section: Inductive Tunersupporting

confidence: 56%

“…In the Radioactive Ion Beam (RIB) facility being built at Kolkata, India [1], radioactive nuclei will be produced inside a thick target and after ionization in an Electron Cyclotron Resonance Ion Source (ECRIS) [2] and mass separation, the low-energy (1.0 keV/u; q/A~1/16) RIB will be accelerated to about 86 keVlu in a the Radio Frequency Quadrupole (RFQ) [3] linac and then in IH-LINAC [4] to the final energy.…”

Section: Introductionmentioning

confidence: 99%

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RF coupler and frequency tuning system design for RFQ cavity of VEC-RIB

Pandey

Naik

2007

2007 IEEE Applied Electromagnetics Conference (AEMC)

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An input coupler with adequate coupling is needed so as to transfer a higher CW power to the RFQ cavity effectively and maintain a match between the final RF amplifier and cavity R ...... -L R = 2. (Lp / 2) and Figure 2 .The lumped equivalent circuit of RFQ resonating structure If the total number of such rf-cell is n then L RFQ = L R / nand C RFQ = n. C R Using the basic four wire transmission line and parallel plate transmission line theory we can calculate the C rod and Lpos t [6]. These help for calculation of frequency 10, Q-value and shunt impedance R p • Using this description the preliminary rf structure was fixed and further optimization was done with the code MAFIA. The resonant frequency, Q value and shunt impedance R p of the 1.7 m long structure with unmodulated electrodes of the same characteristic radius have been calculated to be 35.16 MHz, 9830 and 174 kQ respectively. The resonant structure is formed by the four vanes supported on posts on a base plate. Each diagonally opposite pair of vanes is supported by two posts. The basic rf cell of the above 'four-rod' structure can be described as two coupled A14 transmission lines excited in transverse 1t-mode forming a parallel LC resonant circuit with the vanes as capacitance and the posts as inductance. In this configuration the posts can be seen as a parallel plate transmission line shorted at on end and other end is open (with height I :s A/4) acting as inductor and these are loaded with vans that can be seen as capacitance (open ended transmission line). The lumped equivalent circuit of one resonating rf-cell is shown in Figure 2. The total capacitance of resonating structure of one rf-cell is C R and inductance is L R • Where

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Section: Inductive Tunersupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

RF coupler and frequency tuning system design for RFQ cavity of VEC-RIB

Pandey

Naik

2007

2007 IEEE Applied Electromagnetics Conference (AEMC)

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“…operating at 33.7 and 37.8 MHz [2,3]. Main advantage of this type of RFQ is -robust mechanical structure with embedded cooling channels, no brazed joints and ease of frequency tuning.…”

Section: Jinst 12 T02005mentioning

confidence: 99%

Physics design of rod type proton Radio Frequency Quadrupole linac

et al. 2017

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A Radio Frequency Quadrupole (RFQ) linac delivering 800 keV, 5 mA protons has been designed. It is envisaged as first injector of the proton driver that will be used for production of proton-rich radioactive beams in the proposed ANURIB facility. The option of rod-type structure at frequency of 80 MHz has been chosen owing to ease of mechanical fabrications and to avoid detrimental nearby dipole modes present in vane type structure. Optimization of parameters has been carried out for a viable length and power of RFQ in order to avoid any infrastructural complexity. Conventional method of keeping focusing factor and vane voltage constant along the length of RFQ has been adopted. Results of detailed beam dynamics and RF structure design, space charge induced effects and corroborative particle tracking with realistic 3D fields of modulated vane has been presented.

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“…The reaction products diffusing out of the target would be ionized to 1 + charge state in an integrated target-ion source and would then be transported to an ECR ion-source charge breeder for producing multiply charged radioactive ions. A dipole downstream of the ECR would select the ion beam of interest (q/A selection) and then the ion beam would be accelerated first in an RFQ [2][3][4] to about 99 keV/u and then in a series of IH Linac tanks [5] to about 415 keV/u. The post accelerators including the RFQ have been designed for q/A ≥ 1/14.…”

Section: Introductionmentioning

confidence: 99%

Design of medium energy beam transport line between the RFQ and the Linac in the radioactive ion beam facility at VECC, Kolkata

et al. 2010

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The design of a medium energy beam transport (MEBT) line comprising of a re-buncher and four quadrupoles, two upstream and the other two downstream of the re-buncher, has been presented. The design was done to ensure almost 100% transport of heavy-ion beams of about 99 keV/u energy from RFQ having a q/A not less than 1/14 through the re-buncher and then through IH Linac of about 0.6 m length in which beam would be accelerated to about 185 keV/u. The re-buncher has been designed to operate at 37.8 MHz, the resonating frequency of both the RFQ and the IH Linac. The entire beam line has been installed and recently O 5+ beam from RFQ has been transported through the re-buncher and subsequently accelerated in the IH Linac successfully.

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33.7 MHz heavy-ion radio frequency quadrupole linac at VECC Kolkata

Cited by 8 publications

References 4 publications

RF coupler and frequency tuning system design for RFQ cavity of VEC-RIB

RF coupler and frequency tuning system design for RFQ cavity of VEC-RIB

Physics design of rod type proton Radio Frequency Quadrupole linac

Design of medium energy beam transport line between the RFQ and the Linac in the radioactive ion beam facility at VECC, Kolkata

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