Electron beam extraction on plasma cathode electron sources system

Purwadi, Agus; Taufik, Taufik; Susita, R M Lely; Suprapto, Suprapto; Saefurrochman,; Anjar, A H; Wibowo, Kurnia; Aziz, Ihwanul; Siswanto, Bambang

doi:10.1063/1.4978849

Cited by 5 publications

(4 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Likewise, Cintia et al (2018) argue that discovery learning can improve students' mathematical creativity. Moreover, students who are taught using discovery learning perform better in trigonometry creativity than those who are engaged in the conventional learning process (Chrysmawati et al, 2017). Darusman (2014) found that the increase of mathematical creativity of students whose learning was facilitated with the mind-mapping method was more significant than that of the students who were taught using conventional methods.…”

Section: Students' Responses At the End Of Cycle IImentioning

confidence: 99%

Learning To Promote Students’ Mathematical Curiosity And Creativity

2023

View full text Add to dashboard Cite

[Background] Discovery learning is a model that guides students to actively learn in finding concepts or knowledge through an inquiry process based on the data or information obtained from experiments or observations. [Objective] The present study examined the implementation of a modification of discovery learning using mind mapping in promoting students’ mathematical curiosity and creativity. [Method] A Classroom Action Research (CAR) design was employed in this study. The participants were 250 students in Middle Indonesian who registered in the academic year of 2020/2021. [Results] The descriptive analysis showed that the students achieved an average score of 44.04 with a standard deviation of 18.716 in pre-CAR, 52.48 with a standard deviation of 22.978 after cycle I, and 76.72 with a standard deviation of 17.097 after cycle II. Based on the students’ mathematical creative thinking scores, 2 (8%) students could perform creative thinking in pre-CAR, 6 (24%) students after cycle I, and 22 (88%) students after cycle II. These figures indicated that the students classically achieved the ability to think creatively in mathematics after cycle II. [Conclusion] It was concluded that the implementation of modified discovery learning and mind mapping could promote students’ mathematical creative thinking ability. The interview results also suggest that the learning model could increase mathematical curiosity of both the low and high achievers.

show abstract

Section: Students' Responses At the End Of Cycle IImentioning

confidence: 99%

Learning To Promote Students’ Mathematical Curiosity And Creativity

2023

View full text Add to dashboard Cite

show abstract

“…Elektron di dekat selubung ion (ion sheath) diperlambat sedang untuk ion dipercepat [5]. Untuk lolos dari plasma elektron harus dapat mengatasi penghalang potensial, oleh karenanya persamaan umum untuk kerapatan arus elektron ke kolektor j e diberikan oleh persamaan Boltzmann [6]. , (1) dengan j e kerapatan arus elektron plasma, j e0 kerapatan arus elektron plasma jenuh/maksimum, e muatan elektron (1,602 × 10 -19 C), φ p potensial plasma, φ k potensial kolektor, k tetapan Boltzmann (1,381 × 10 -23 J/K), dan T e suhu elektron plasma.…”

Section: Landasan Teoriunclassified

“…Bejana anoda berongga yang digunakan adalah berbentuk silinder dengan volume V, jejari r dan panjang l (V = πr 2 l), maka kerapatan partikel elektron n e dalam BE adalah jumlah partikel total dibagi dengan volume V. Muatan 1 (satu) coulomb untuk partikel elektron adalah sebanyak 6,256 × 10 18 partikel, sedang muatan total Q yang merupakan hasil kali besar arus lucut I(t) dengan lebar pulsa τ (dapat diperoleh dari hasil eksperimen) atau Q = I(t) × τ, maka kerapatan partikel/elektron n e dalam BE dapat dihitung dengan [10] . (5) Untuk penentuan parameter suhu elektron plasma T e dapat dihitung dari persamaan (2) yang merupakan persamaan untuk rapat arus lucut elektron jenuh/maksimal j e pada suatu nilai tegangan ekstraksi U a tertentu (Gambar 4) yaitu dapat dinyatakan dalam bentuk , (6) dengan T e suhu elektron plasma, m e massa elektron = 9,109 × 10 -31 kg, e muatan elektron = 1,602 × 10 -19 C, n e kerapatan plasma, dan k tetapan Boltzmann = 1,381 × 10 23 J/K.…”

Section: Gambar 3 Emisi Elektron Dari Plasma Dengan Teganganunclassified

“…Kedua nilai parameter elektron plasma n e dan T e tersebut telah sesuai dengan yang diharapkan karena menurut literatur untuk kondisi pengerjaan secara eksperimen untuk nilai n e berkisar antara 10 12 hingga 10 14 partikel/cm 3 dan untuk nilai T e adalah hanya dalam beberapa eV [6]. Secara perhitungan/simulasi telah ditentukan besar jejari arus berkas elektron optimum adalah sebesar r = 2,00 mm dan arus lucut plasma I ADPS-Opt.…”

Section: Hasil Dan Pembahasanunclassified

See 1 more Smart Citation

Penentuan Parameter Elektron Plasma Bejana Emiter Berbasis Besar Arus Lucut Busur Gas Udara

Purwadi

Suprapto²,

Aziz³

et al. 2020

risal.fis.

View full text Add to dashboard Cite

Abstrak – Telah dilakukan penentuan parameter elektron plasma dalam Bejana Emiter (BE) berbasis besar arus lucut busur gas udara pada tegangan 10 kV untuk Ignitor Discharge Power Supply (IDPS) dan tegangan anoda 1 kV untuk Arc Discharge Power Supply (ADPS). Tekanan gas udara divariasi mulai dari 5,70 × 10-3 Torr hingga 7,90 × 10-3 Torr. BE terbuat dari Stainless Steel-304 (SS-304) silinder berdiameter ф = 4,00 cm dan panjang l = 66 cm, dipasangi grid berukuran 60 cm × 2,6 cm dan ditutup dengan frame yang terdiri dari 15 grup lubang (masing-masing berisi 10 lubang kecil berdiameter ф = 0,4 cm). Dari hasil eksperimen pada tekanan gas udara sekitar 6,8 × 10-3 Torr diperoleh arus berkas elektron pulsa terekstraksi sebesar 4,17 A pada tegangan tinggi ekstraksi 5 kV. Berdasarkan arus elekton terekstraksi tersebut, diperoleh kerapatan elektron plasma ne sebesar 3,15 × 1012 partikel/cm3 dan suhu elektron plasma Te sebesar 1,77 × 104 K ≈ 1,50 eV.Kata kunci: emitter, plasma, bejana emiter (BE), lucutan, kerapatan, suhu Abstract – The determination of plasma electron parameters in the Emitter Vessel (EV) based on arc dischage value of air gas has been conducted at 10 kV of Ignitor Discharge Power Supply (IDPS) and 1 kV of anode voltage for Arc Discharge Power Supply (ADPS). The air gas pressure was varied from 5.70 × 10-3 Torr to 7, 90 × 10-3 Torr. The EV was made from Stainless Steel-304 (SS-304) cylindrical shape with diameter ф of 4.00 cm and length l of 66 cm, fitted with 60.00 cm × 2.60 cm grid and covered with a frame consisting of 15 groups of holes (each containing 10 holes small diameter ф of 0.4 cm). From the experiment result at the average air gas pressure of about 6.80 × 10-3 Torr, it was obtained 4.17 A of extracted pulse electron beam current at 5 kV of extracted high voltage. Based on that extracted electron beam current, it was obtained 3.15 × 1012 particles/cm3 of plasma electron density ne and 1.77 × 104 K ≈ 1.50 eV of plasma electron temperature Te. Key words: emitter, plasma, emmiter vessel (EV), discharge, density, temperature

show abstract