| AVS 61st International Symposium & Exhibition | |
| Accelerating Materials Discovery for Global Competitiveness Focus Topic | Wednesday Sessions |
| Session MG-WeM |
| Session: | Design of New Materials |
| Presenter: | Erdong Wang, Brookhaven National Laboratory |
| Authors: | E. Wang, Brookhaven National Laboratory I. Ben-Zvi, Brookhaven National Laboratory J. Skaritka, Brookhaven National Laboratory T. Rao, Brookhaven National Laboratory R. Bothell, Atlas Technologies J. Bothell, Atlas Technologies A. Henry, Atlas Technologies |
| Correspondent: | Click to Email |
The high average current polarized electron source for future electron ion collider (EIC) requires extremely high vacuum. Currently, we have constructed a DC gun based on principle of beams funneling and this gun is under commissioning. Superlattice GaAs cathodes will be used as our electron source. The lifetime of these cathodes is dependent on ion back bombardment which caused by the residual gas pressure. Multiple GaAs cathodes with almost same lifetime are extremely crucial for the operation of this gun. Therefore, produce a uniform extremely high vacuum environment is essential in gun design. We studied residual molecules distribution in funneling gun by Molflow+ and a python based Monte-Carlo simulator. Twenty cathodes testing is under planning. Cathodes lifetime changes will give us indication on vacuum distribution inside the gun. This articles describes our coding and modeling for the gun vacuum, analyzes the residual gas distribution on the gun and discusses on multiple cathodes lifetime measurement test. We also discusses the XHV achievement in our gun test.