Performance characteristics of an induction linac magnetic pulse compression modulator at multi-kilohertz pulse repetition frequencies

Sampayan, S.; Chambers, F. W.; Deadrick, F.J.; Niven, W.A.; Ollis, C.W.; Payne, A.N.; Renbarger, V.L.; Scharlemann, E.T.; Turner, W.C.; Watson, J.

doi:10.1109/pac.1991.165199

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…Here, we explore repetition rate operation of an LIA. The pulsed source for ETA-II utilized thyratrons (Fig 5a, large cabinets) driving a Melville line (large vertical cylindrical structure to the left) [ 59]. The overall schematic is shown in Figure 5b.…”

Section: Resultsmentioning

confidence: 99%

Megavolt Bremsstrahlung Measurements from Linear Induction Accelerators Demonstrate Possible Use as a FLASH Radiotherapy Source to Reduce Acute Toxicity

Sampayan

Sampayan²,

Caporaso

et al. 2021

Preprint

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Recent studies indicate better efficacy and healthy tissue sparing with high dose-rate FLASH radiotherapy (FLASH-RT) cancer treatment. This technique delivers a prompt high radiation dose rather than fractional doses over a longer period of time. The threshold is >40 Gy-s-1 with a maximal effect at >100 Gy-s-1 that must be maintained in the treatment volume. Mechanisms are still widely debated, but toxicity is minimized while inducing apoptosis in malignant tissue. Delivery technologies to date show that a capability gap exists with clinic scale, broad area, deep penetrating, high dose rate capability. Based on present trends, if FLASH-RT is adopted, it may become a dominant approach except in the least technologically advanced countries. The linear induction accelerator (LIA) developed for high current, high repetition rate, species independent charged particle acceleration, has yet to be considered for this application. We briefly review the status of LIA technology, explore the physics of bremsstrahlung-converter-target interactions and our work on stabilizing the electron beam. While the gradient of the LIA is low, we present our preliminary work to improve the gradient by an order of magnitude, presenting a point design for a multibeam FLASH-RT system using a single accelerator for application to conformal FLASH-RT.

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Section: Resultsmentioning

confidence: 99%

Megavolt Bremsstrahlung Measurements from Linear Induction Accelerators Demonstrate Possible Use as a FLASH Radiotherapy Source to Reduce Acute Toxicity

Sampayan

Sampayan²,

Caporaso

et al. 2021

Preprint

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show abstract

“…The voltage output at the load end in the system is directly obtained from the synchronous discharge of switches, each biased to charging voltage; and the temporal characteristics depend on a single brick. The scheme, hence eliminates the intermediated voltage conditioning steps, otherwise employed in the popular magnetic pulse compression (MPC) based systems [23][24][25][26][27][28]. The comparison of the system, specifically with MPC based systems is done taking in consideration the typical areas of application, with specific emphasis to pulse width, rep-rate and temporal jitter requirement of the output voltage [24,[26][27][28].…”

Section: Resultsmentioning

confidence: 99%

Development of 22 kV, 1 kHz rep-rated solid-state pulser based on Linear Transformer Driver topology

et al. 2014

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The present manuscripts discusses the development of a forty stage, 22 kV solid-state pulser based on Linear Transformer Driver (LTD) topology employing 240 MOSFET switches operating at rep-rate of 1 kHz. A transformer based triggering scheme is implemented which enables the switches to operate at a jitter of < 5 ns. Each stage drives ∼ 220 A peak pulsed current and the output voltage of forty such stages are inductively added to generate 22 kV across 100 Ω resistive load, having a rise time of ∼ 20 ns. The paper presents the developmental steps, highlighting the temporal jitter characteristics ∼ 5 ns (peak to peak jitter measured at output voltage at load end) demonstrated by the system.

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“…There is potential for improvement. Using a much larger power supply (5 MW compared to 695 kW total for ETA-III), the High Average Power Test Stand at LLNL was able to consistently demonstrate operation of a PPU and MAG-1D pulse compressor into a dummy load for 800-pulse bursts (a result of the work described in ref [4]). Burst length could also be extended by using larger capacitor banks.…”

Section: Discussionmentioning

confidence: 90%

“…The timing system was especially critical [4]. The electron beam provided most of the loading for Ihe highvoltage pulse at the induction gaps.…”

mentioning

confidence: 99%

Burst mode FEL with the ETA-III induction linac

Lasnier

Allen

Felker

et al.

Proceedings of International Conference on Particle Accelerators

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The FEL peak output power exceeded 1 GW during many Pulses of 140 GHz microwaves have been produced at a bursts. This is not as great as the highest power (=2 GW) 2 kHz rate using the ETA-III induction linac and IMP wiggler. measured during single-pulse operation [ 11. Corkscrew and The accelerator was run in bursts of up to 50 pulses at 6 MeV energy sweep of the beam during a burst remained within the and greater than 2 kA peak current. A feedback timing control acceptable range during short bursts, as evidenced by consistent system was used to synchronize acceleration voltage pulses FEL output (Fig 4). The experimental time to optimize with the electron beam, resulting in sufficient reduction of the operation was limited, so the longest recorded burst of corkscrew and energy sweep for efficient FEL operation. Peak microwaves contained slightly more than 25 pulses (Fig. 5). microwave power for short bursts was in the range 0.5-1.1 GW, which is comparable lo the single-pulse peak power II. DESCRIPTION OF THE EXPERIMENT of 0.75-2 GW [l]. FEL bursts of more than 25 pulses were obtained.

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Performance characteristics of an induction linac magnetic pulse compression modulator at multi-kilohertz pulse repetition frequencies

Cited by 6 publications

References 5 publications

Megavolt Bremsstrahlung Measurements from Linear Induction Accelerators Demonstrate Possible Use as a FLASH Radiotherapy Source to Reduce Acute Toxicity

Megavolt Bremsstrahlung Measurements from Linear Induction Accelerators Demonstrate Possible Use as a FLASH Radiotherapy Source to Reduce Acute Toxicity

Development of 22 kV, 1 kHz rep-rated solid-state pulser based on Linear Transformer Driver topology

Burst mode FEL with the ETA-III induction linac

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