Estimation of dispenser cathode surface temperature of a practical potted heater cathode assembly

1993 ◽  
Vol 40 (10) ◽  
pp. 1855-1863 ◽  
Author(s):  
A. Sil ◽  
N.K. Samria ◽  
A. Chatterjee ◽  
D.S. Venkateswarlu
Keyword(s):  
Surface Temperature ◽  
Cathode Surface ◽  
Dispenser Cathode ◽  
Cathode Assembly

Evaluation of Cathode Heater Assembly for 42 GHz, 200 kW Gyrotron

Frequenz ◽  
2014 ◽  
Vol 68 (9-10) ◽  
Author(s):  
S. K. Sharma ◽  
Narendra Kumar Singh ◽  
Udaybir Singh ◽  
Hasina Khatun ◽  
Nitin Kumar ◽  
...  
Keyword(s):  
Surface Temperature ◽  
Cathode Surface ◽  
Magnetron Injection Gun ◽  
Heater Power ◽  
Vacuum Processing

AbstractIn this paper, the evaluation of cathode-heater assembly of magnetron injection gun (MIG) for 42 GHz, 200 kW gyrotron is presented. The cathode-heater assembly is purchased from M/S SEMICON.The cathode-heater assembly is experimentally studied in three different conditions; in a belljar system, during vacuum processing of MIG and during MIG testing to ensure the required rise of cathode surface temperature for pre-set heater power.

Validation of evaporation-determined model of arc-cathode coupling in the peak current phase in pulsed GMA welding

2021 ◽  
Author(s):  
Marek Sebastian Simon ◽  
Oleg Mokrov ◽  
Rahul Sharma ◽  
Uwe Reisgen ◽  
Guokai Zhang ◽  
...  
Keyword(s):  
Surface Temperature ◽  
Weld Pool ◽  
Cathode Surface ◽  
Gma Welding ◽  
Gas Metal Arc Welding ◽  
Welding Process ◽  
Qualitative Reasoning ◽  
Current Phase ◽  
Temperature Plasma ◽  
Peak Current

Abstract A first experimental validation of the EDACC (evaporation-determined arc-cathode coupling) model is performend by comparing the experimental and simulated current in the peak current phase of a pulsed GMAW (gas metal arc welding) process. For this, the EDACC model was extended to limit the cathode surface temperature to a realistic value of <2400K. The information on the plasma for the EDACC model was gathered from literature and extrapolated and extended according to qualitative reasoning. The information on the cathode surface of the EDACC model was derived from a steady-state simulation of the weld pool, using an averaging approach over time for the energy and current. The weld pool surface temperature was compared to pyrometric measurements, that were performed for this work, and the agreement was found to be fair. The observed agreement between the modelled and experimentally determined current was within 10%. As strong assumptions were made for the comparison, the validation cannot be considered as final, but the assumptions are thoroughly analyzed and discussed. However the critical link between surface temperature, plasma temperature and total current transmitted could be reconstructed.

Research on Cathode Chronopotentiograms and Interelectrode Resistance during Vacuum Boiling Electroforming

2014 ◽  
Vol 633-634 ◽  
pp. 854-857
Author(s):  
Jun Tao Wang ◽  
Ping Mei Ming
Keyword(s):  
Surface Temperature ◽  
Surface Quality ◽  
Cathode Surface ◽  
Process Conditions ◽  
Cathode Potential ◽  
Research Results ◽  
Vacuum Degree ◽  
Electroforming Process ◽  
Change Characteristics ◽  
Interelectrode Resistance

Studies have showed that the electrolyte vacuum boiling electroforming process can significantly improve surface quality and microstructures of the deposited layer. To explore the mechanisms that produce the above-mentioned favorable improvements, this paper focused on analyzing the change characteristics of cathode potential and interelectrode resistance carried out under different process conditions. Research results showed that, reducing vacuum degree or increasing cathode surface temperature result in an intense fluctuation in the cathode chronopotentiometry and interelectrode resistance; decreasing the vacuum degree causes the whole cathode chronopotentiometry to shift negatively, but situation is opposite when the cathode surface temperature rises.

Sign in / Sign up

Export Citation Format

Share Document