Secondary electron time detector for mass measurements at CSRe

A pilot experiment for mass measurement at CSRe

Electron cooling plays an important role in the Heavy Ion Research Facility of Lanzhou cooler storage ring (HIRFL-CSR). Two electron coolers were equipped in main ring (CSRm) and experimental ring (CSRe) in HIRFL-CSR respectively. Two electron cooling devices have commissioned for twelve years since they were installed and completed in 2004. The function and operation procedure of electron cooler were presented in this report. Their performance and the highlights of experiments results were described. Their commission and optimization were summarized here. The issues and troubles during the commission were enumerated and collected in this presentation. The future upgrade and improvement were suggested, and the new operation scenario and requirement were proposed. INTRODUCTION OF HIRFL-CSR HIRFL-CSR (Heavy Ion Research Facility at Lanzhou--Cooling Storage Ring ) is multi-purpose accelerator complex [1], it is consisted two storage ring, the heavy ion beam with energy range 8-50 MeV/u from HIRFL— composed two existing cyclotron SFC(K=69) and SSC (K=450) is used as injector, will be accumulated, cooled and accelerated to the high energy range of 100—400 MeV/u in the main ring (CSRm), then extracted fast to produce RIB or highly charged heavy ions. The secondary beams will be accepted and stored by experimental ring (CSRe) for many internal target experiments or high precision spectroscopy with beam cooling, On the other hand, the beam with energy range of 100-900 MeV/u will also be extracted from CSRm with slow and fast extraction. Accelerated ion beam from the CSRm through the radioactive beam separator line with the length of 100m was injected into the CSRe. Generally the CSRe operated with the DC mode. A gas jet internal target was installed in the opposite side of electron cooler. ELECTRON COOLING FOR CSR In CSRm, the electron cooling device [2, 3, 4, 5, 6] plays an important role in the heavy ion beam accumulation at injection energy. The new state-of-the-art electron cooling device was designed and manufactured in the collaboration between BINP and IMP, it has three distinctive characteristics, namely high magnetic field parallelism in cooling section, variable electron beam profile and electrostatic bending in toroids. Each ring was equipped an electron cooling device, the electron energy in the main ring is 35 keV and 300 keV for the experimental ring. The electron cooling device plays an important role in HIRFL-CSR experimental ring for the heavy ion beam. Continuous electron cooling is applied to the stored ion beam for the compensation of the heating by various scattering. The most important is the ability to cool ion beams to highest quality for physics experiments with stored highly charged ions.

http://jacow.org/rupac2016/papers/wepsb042.pdf

Commissioning of Electron Cooling Devices at HIRFL-CSR

The Tune measurement system for HIRFL-CSR has been running in the commissioning of CSRm.The FFT method is used in the system.It is composed of two parts,one is a kicker system that is made up of a noise generator,an excitation kicker,a power amplifier and a switch for the excitation signal,another one is for measurement of the Tune that is made up of a beam position monitor,a 180° hybrid,a switch for the time delay of the synchronization and a real time spectrum analyzer.The principle and the results of the Tune measurement are introduced in the paper.

Tune Measurement System for HIRFL-CSR

A Schottky precise mass spectroscope in lightmedium and in heavier nuclei with the mass resolution of Δm/m=5×10-6 or 5×10-7,respectively,has been successfully built up and operated well at ESR ( Experimental Storage Ring cooled by electron beam) in G SI,the leading nuclear research institute.The spectroscope is anonstop of the beam type with quite sensitive,even one nucleus can be measured,setup that is a beam diagnosis relia ble instrument for the cooling beam in ESR,now it becomes aprecise mass spectroscope for nuclear reaction and nuclear spectroscopy study.

Schottky Mass Spectroscope

Some signal samples acquired from Schottky probes and beam position monitor during operation were presented in this paper, and they were observed in the different operation stages such as during injection, after cooling and cooling force measurement. These signals were considered related with the ion beam instability. The central frequency of ion beam varied with the time. Some were caused by the ripple of hardware, the other were created by ion beam itself. The reasons which caused these phenomena were analyzed. The possible solutions were suggested, and some necessary upgrade and improvements were expected. These results were helpful to attempt the Schottky Mass Spectrometry measurement in the CSR.

Beam instability phenomena observed at HIRFL-CSR in the presence of electron cooler

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Beam instability phenomena observed at HIRFL-CSR in the presence of electron cooler