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The pulse injector of the low energy positrons

机译：低能正电子的脉冲注入器

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The pulsed injector of the low energy positrons for positron accumulator LEPTA has been constructed and tested at JINR. The injector is based on ~(22)Na radioactive source. Positrons from the source are moderated in the solid neon and injected into positron trap, where they are accumulated during about 80 seconds. For injection the positrons are extracted by the pulsed electric field and accelerated up to the required energy. The injector will generate positrons of the energy of up to 10 keV at relative energy spread of 210~(-3), intensity of 10~8 -10~9 particles per pulse and at injection pulse duration of 300 nsec.rnThe cryogenic source of slow positrons has been tested with a test isotope ~(22)Na of the initial activity of 80 MBk. The continuous slow positron beam with average energy of 1.2 eV, width of a spectrum 1 eV has been obtained. The achieved moderator efficiency is about 1 %.rnThe accumulation process in the positron trap was investigated with electron flux. The life time of thernelectrons in the trap, τ_(life) ≥ 80 s and capture efficiency v ～ 0.4 have been obtained. The maximum number of thernaccumulated particle was N_(exper) = 2~*10~8 at the initial flux of 5·10~6 electrons per sec.rnThe dynamics of slow positrons (electrons) in the injector and physics of the particle storage process are discussed in the report.rnThe work is supported by RFBR grant No 05-02-16320, the president of Russia Federation grant (MK-3948.2007.2) for supporting of young scientists and leading scientific schools.
机译：正电子蓄能器LEPTA的低能正电子脉冲注入器已在JINR建造并经过测试。喷射器基于〜（22）Na放射源。来自源的正电子在固态氖气中被缓和，然后注入到正电子阱中，并在其中聚集约80秒。为了注入，正电子由脉冲电场提取并加速到所需能量。注入器在210〜（-3）的相对能量扩散，每脉冲10〜8 -10〜9个粒子的强度以及300 ns的注入脉冲持续时间内将产生高达10keV的正电子。慢速正电子已通过初始活动为80 MBk的测试同位素〜（22）Na进行了测试。已获得平均能量为1.2 eV，光谱宽度为1 eV的连续慢速正电子束。达到的慢化剂效率约为1％。用电子通量研究了正电子陷阱中的积累过程。陷阱中电子的寿命为τ_（life）≥80 s，捕获效率为v〜0.4。在每秒5·10〜6个电子的初始通量下，最大堆积粒子的数量为N_（exper）= 2〜* 10〜8。rn注入器中慢速正电子（电子）的动力学和粒子存储过程的物理学该报告由RFBR拨款05-02-16320资助，俄罗斯联邦总统拨款（MK-3948.2007.2）支持青年科学家和领先的科学学校。

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