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

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Abstrak Telah dilakukan penentuan  parameter elektron plasma dalam Bejana Emitter (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 Ñ„ = 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 Ñ„ = 0,4 cm). Dari hasil eksperimen pada tekanan gas udara rerata 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 n_esebesar 3,15 ´ 10¹² partikel/cm³ dan suhu elektron plasma T_e sebesar 1,77 x 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 discharge value of air gas has been conducted at 10 kV of Ignitor Discharge Power Supply (IDPS) and 1 kV anode voltage for Arc Discharge Power Supply (ADPS). The air gas pressure was varied at 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 Ñ„ of 4.00 cm and length l of 66 cm, fitted with a grid measuring 60.00 cm ´ 2.60 cm and covered with a frame consisting of 15 groups of holes (each containing 10 holes small diameter Ñ„ 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 n_e and 1.77 x 10⁴ K ≈ 1,50 eV of plasma electron temperature T_e.

Key words: emitter, plasma, emmiter vessel (EV), discharge, density, temperature