GX Pei

[Effect of Stand Age on Soil Extracellular Enzyme Activity and Stoichiometry in Chinese Fir (Cunninghamia lanceolata) Plantations in Southern Subtropical China].

Manman Ou, Zhongguo Li, GX Pei, Bing Mao et autres

contents in different forest ages. Changes in soil physicochemical properties induced by forest stand age variations were the main driving factor for the changes in soil enzyme activities and enzyme stoichiometric characteristics in Chinese fir plantations. The results of this study provide …

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Progress on the Design and Construction of the 100 MeV / 100 kW Electron Linac for the NSC KIPT Neutron Source

Shilun Pei, Yunlong Chi, GX Pei, S. Wang et autres

IHEP in China is designing and constructing a 100 MeV / 100 kW electron linac for NSC KIPT, which will be used as the driver of a neutron source based on a subcritical assembly. Recently, the physical design has been finalized. The …

Positron sources using channeling: A promising device for linear colliders

X. Artru, I. Chaikovska, R. Chehab, M. Chevallier et autres

International audience

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BEPC II linac beam commissioning and operation

王书鸿, 裴国玺, Yunlong Chi, 陈延伟 et autres

The BEPC II injector linac upgrade goal aims at higher beam energy with smaller beam emittance and energy spread to meet the colliding luminosity upgrade by two orders of magnitude. This paper describes the beam commissioning and operation. The beam energy, energy …

Studies on the beam orbit and energy instabilities at the BEPC II linac

王书鸿, 裴国玺, 刘渭滨, 陈延伟 et autres

During the commissioning and early operation of the upgraded BEPC II injector linac, some beam instabilities were appeared, and have been studied by both experimental and analytical ways. This paper describes the observed beam orbit instabilities, beam energy jitter, and the beam …

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BEPCII-The Second Phase Construction of Beijing Electron Positron Collider

Chuang Zhang, GX Pei

BEPCII, the second phase construction of the Beijing Electron Positron Collider (BEPC), is a double ring machine with a design luminosity of 1×1033cm-2s-1at 1.89GeV, two orders of magnitude higher than present BEPC. The construction was started in the beginning of 2004 and …

PAD design for the phasing system of BEPC II linac

耿哲峤, 侯汨, 裴国玺, ZQ Geng et autres

Phase and amplitude measurement is one of the most important issues for the phasing system of BEPCII linac. Two kinds of PAD, based on analog and digital I/Q demodulator respectively, have been constructed and tested in both laboratory and the klystron gallery …

Beam commissioning of BEPC II injector Linac

陈延伟, 王书鸿, 裴国玺, 刘渭滨 et autres

This paper describes the beam commissioning process of BEPC II Injector Linac. Aiming at the beam design goal and the beam physics characteristics of this injector linac, the beam commissioning method has been proposed, and some problems met in the beam commissioning …

Concept design of the BTF accelerator

朱雄伟, 裴国玺, Yunlong Chi, Jianping Dai et autres

Beijing X-ray free electron laser test facility (BTF) will reside in the BEPCII Linac, which is the best electron linac in China. The BTF will not use the existing DC gun pre-injector, but use photoinjector to obliquely inject beam to the main …

BEPC II positron source

裴国玺, 孙耀霖, 刘晋通, Yunlong Chi et autres

BEPC II - an upgrade project of the Beijing Electron Positron Collider (BEPC) is a factory type of e(+)e(-) collider. The fundamental requirements for its injector linac are the beam energy or 1.89GeV for on-energy injection and a 40mA positron beam current …

Design studies of RF phasing system for BEPC II linac

顾鹏达, 耿哲峤, 崔艳艳, 裴国玺 et autres

In order to compensate the RF phase drift due to various factors, we will establish a RF phasing system for BEPC II linac. Energy maximizing method will be used to determine the RF phase of each RF power source. A coaxial line …

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Development of the BEPC II positron source flux concentrator

刘晋通, 耿哲峤, X. Sun, 孙耀霖 et autres

The flux concentrator is a matching device for the positron beam, which matches the transverse emittance between the target and successive accelerator tubes. It is one of the most important parts of the BEPC II positron source and for improving the positron …

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