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SECOND GENERATION RHODOTRON® BENEFITS OF BEAM PULSING

IP.com Disclosure Number: IPCOM000242937D
Publication Date: 2015-Sep-01
Document File: 8 page(s) / 295K

Publishing Venue

The IP.com Prior Art Database

Abstract

Pulsing the RF system of the second generation Rhodotron® is an innovation bringing multiple advantages to the traditional continuous wave first generation Rhodotron®. This white paper describes some benefits of the pulsed Rhodotron®.

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Page 01 of 8

WHITE PAPER

SECOND GENERATION RHODOTRON® BENEFITS OF BEAM PULSING

Date: September 2015


Authors: Michel Abs, Jeremy Brison and Philippe Dethier IBA

Pulsing the RF system of the second generation Rhodotron® is an innovation bringing multiple advantages to the traditional continuous wave first generation Rhodotron®.

This white paper describes some benefits of the pulsed Rhodotron® including:


Reduced power consumption
Increased Electron-Beam energy
Reduced size Rhodotron®


Fast beam switching

02REDUCED POWER CONSUMPTION

The industry has increasing challenges when it comes to efficient use of energy. Pulsing the Rhodotron® RF system is a very interesting way to improve its energy efficiency.

The total Rhodotron® power consumption consists of the sum of:


Electron beam power


Power required to polarize and maintain the cavity acceleration field


Power consumed by other accelerator systems (magnets, vacuum, primary cooling, control system, …)

Pulsing the RF system allows improving the Rhodotron® power efficiency by increasing the ratio "Average Beam Power" / "Average Cavity Power".

Second Generation Rhodotron® Benefits of Beam Pulsing - September 2015

01INTRODUCTION

1


Page 02 of 8

WHITE PAPER

consumption

Electron beam power

Electron beam power consumption

P

P

Cavity power

consumption

O

W

E

R

O

W

E

R

POWER SAVINGS POWER SAVINGS

Cavity power consumption

Other systems power consumption

Other systems power consumption

TIME

TIME

 Figure 1 : Continuous wave Rhodotron® power consumption breakdown (left) versus Pulsed beam power consumption (right). Pulsed beam improves Rhodotron® energy efficiency by improving the ratio Average Beam Power / Average Cavity Power

In this example, both beam profiles lead to the same average beam power


1. In Continuous Wave mode : Average beam power = Peak beam power


2. In Pulsed beam mode : Average beam power = Peak beam power * duty cycle

In general, the most significant energy efficiency improvements occur when the average beam power required is the lowest compared with maximum peak beam power available.

In pulsed mode, the beam power is always set at the maximum beam the Rhodotron® can achieve and the average beam power is changed by adapting the pulsing duty cycle.

The average power required by the cavity in pulsed mode is drastically reduced making the Rhodotron® a very energy efficient solution, especially when compared to traditional Electron beam Linear Accelerators (Linacs).

Second Generation Rhodotron® Benefits of Beam Pulsing - September 2015

2


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WHITE PAPER

Energy efficiency

Linac vs Rhodotron®

35,0%

30,0%

Energy efficiency

25,0%

Typical 10 MeV Linac

Rhodotron 1st generation

Rhodotron 2nd generation

20,0%

15,0%

10,0%

5,0%

0,0%

10 20 30 40 50 60

Beam power

Figure 2 : The second generation Rhodotron® is by far the most energy efficient 10 MeV accelerator available. From 30kW (dotted line), 2 Linacs are usually required.

In the 10 to 60 kW beam range, a...