Modal analysis of HPGe detector assembly in gamma-ray spectrometers

Jakovļevs, Oļegs; Malgin, Vladislav; Vība, Jānis

doi:10.21595/vp.2017.19205

Cited by 3 publications

(6 citation statements)

References 9 publications

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“…Moreover, it is important to take into account the Q-factor of considered oscillatory systems, which is determined by the energy dissipation in the material and elastic supports. For example, the Q-factor of the detector assembly with fiberglass supports for the axial vibration mode does not exceed 10-15 [7]. The Q-factor of the axial resonances of the vacuum cap is much higher and reaches values of 50-70.…”

Section: The Dynamic Model Of Cryostat With Hpge Detectormentioning

confidence: 99%

“…The gamma-ray spectrometer "Monolith" can be equipped with HPGe crystals of various size and mass, which are determined by the required efficiency [7]. The mass of the installed crystal can vary from 0.5 to 1.8 kg or more.…”

Section: The Dynamic Model Of Cryostat With Hpge Detectormentioning

confidence: 99%

“…A significant vibration reduction at the driving frequency is usually provided by a tuned vibration absorber. However, its harmonics can cause resonant oscillations of oscillatory systems [7]. The output capacitance of HPGe detector is very small and does not exceed a few pF.…”

Section: The Dynamic Model Of Cryostat With Hpge Detectormentioning

confidence: 99%

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Modal analysis application for the problemof gamma-ray spectrometers resolution improving

Malgin¹,

Jakovļevs²,

Vība³

2019

Vib. proced.

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The cryostat of gamma-ray spectrometer with HPGe detector cooled by Stirling cycle cryocooler is under consideration. The natural frequencies and modes shapes for components involved to oscillatory systems distinguished in dynamic model of cryostat were calculated by Solidworks simulation. The results obtained for the gamma-ray spectrometer "Monolith" produced by BSI, represent its specific modal portrait and allow identification the components of electrical noise due to microphone effect. The absence of resonant amplification due to coincidence between the harmonics of cryocooler operating frequency and the natural frequencies of the cryostat components is an important condition for reducing the influence of microphonics. The results obtained by modal analysis are also useful for assessing the influence of external mechanical disturbances, such as shocks, external vibration or audible noise.

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Section: The Dynamic Model Of Cryostat With Hpge Detectormentioning

confidence: 99%

Section: The Dynamic Model Of Cryostat With Hpge Detectormentioning

confidence: 99%

See 1 more Smart Citation

Modal analysis application for the problemof gamma-ray spectrometers resolution improving

Malgin¹,

Jakovļevs²,

Vība³

2019

Vib. proced.

Self Cite

View full text Add to dashboard Cite

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“…2. Результаты расчетов использованы при проектировании подвески ОЧГ-детектора с целью отстройки ее резонансных частот от вибрационного спектра используемого ЭМО [12,13].…”

Section: а бunclassified

Development of Unified Spectrometric Module Based on HPGE Detectors with Electric Machine Cooling

Yakovlevs

Malgin

Gostilo

2018

Nucl. and Rad. Safe.

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The development results of unified spectrometric module based on HPGe detectors with electric machine cooling for application in nuclear physical equipment of various application are presented. Unified module has cryostat with HPGe detector of the required size, electric machine cooler and electronic unit. The analysis of the cooling processes dynamics and HPGe detectors heating in cryostats, cooled by liquid nitrogen and EMC is made on the sample of the typical cooling circuits. Much attention is paid to design technological aspects of the cryostat development, cooled with electric coolers. With Solidworks software package the modal analysis of the cryostat cover and HPGe detector with various registration efficiency and weight was carried out. Based on the modal analysis of HPGe detector assembly the design of the holders where axial vibration mode was removed to the area of higher harmonics with smaller amplitudes was selected. The design of the developed unified module is reviewed. To increase EMC efficiency the additional radiators with heat tubes are installed and active method of blow off was applied. It secured the temperature decrease of EMC extender and accordingly provided the heat mode comfort for EMC operation what increases the safety of the developed module. The spectra of radioisotopes Co-57 and Co-60 are presented, registered by unified spectrometric module with HPGe detector with gamma radiation registration efficiency of 40%. The energy resolution by energies 122 and 1332 keV is 0,98 and 1,85 accordingly. The overall sizes of the unified module is 280×315×265 mm, its weight with the detector is about 20 kg. The module provides the radiation registration in any spatial position. It allows easy installation of the developed module on various equipment. The samples of the manufactured devices with unified spectrometric module are presented.

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“…Visaktīvāk ĪTG detektora kriostatā tiek izmantots labirinta tipa balsti [14]. Tāpat arī tiek minēti balstu pielietošanas rezultāti, izmantojot trīs elastīgos gredzenus [52]. Ir attēloti (3.12.att.)…”

Modal analysis of HPGe detector assembly in gamma-ray spectrometers

Cited by 3 publications

References 9 publications

Modal analysis application for the problemof gamma-ray spectrometers resolution improving

Modal analysis application for the problemof gamma-ray spectrometers resolution improving

Development of Unified Spectrometric Module Based on HPGE Detectors with Electric Machine Cooling

Dinamisko procesu analīze kriostatos ar elektromašīnu dzesēšanu

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