Performance study of trial M-THGEM

BackgroundM-THGEM is a new type of electron multiplier, which is developed with a high gain, good stability and uniformity based on THGEM. With the successful application of small area M-THGEM, the large-area M-THGEM is proposed based on large-volume gas detector.
PurposeThe production of large-area M-THGEM is difficult compared with the small one with more holes and more stable instruments. To meet the requirements of large-area gas detectors, the performances of the large-area M-THGEM need to be measured and researched, which will provide a guidance on the process and design of the M-THGEM.
MethodsThe M-THGEM membrane was loaded into a chamber to complete the test under the conditions of ^55 Fe/X-ray source (5.9 keV) and working gas Ar:iC _4 H _10 = 97:3. The performance of gain, energy resolution, uniformity and long-term stability can be tested.
ResultsBased on the small area M-THGEM, the research and design of large-area M-THGEM with 200 \times 200\,\mathrmmm^2 were finished. The basic performances were measured. The results show that the gain with the working gas of Ar:iC _4 H _10 = 97:3 can reach to 6 \times 10^3 , and the energy resolution of the ^55 Fe /X-ray source (5.9 keV) reaches 29.4% with a good gain uniformity and stability.
ConclusionAt present, the production and measurement of the large-area M-THGEM has been finished. The M-THGEM of 200 \times 200\,\mathrmmm^2 shows a good performance, which will provide many references for the future design.