Physical and Electromagnetic Properties of Customized Coatings for SNS Injection Ceramic Chambers and Extraction Ferrite Kickers

Estimation of secondary electron effect in the J-PARC rapid cycling synchrotron after first study

“…We also investigated the SEY from the kicker ferrite. Since the ferrite as material for a kicker is expected to have a high SEY, the SNS kicker surface was reported to be covered with the TiN [7]. In the case of J-PARC RCS, the kicker ferrite was not covered with any coating.…”

Summary on Titanium Nitride Coating of SNS Ring Vacuum Chambers

“…Half-Cell B (9) Half-Cell C (9) bellows (6) quad doublet (3) chicane chambers (4) reactive DC magnetron sputtering -using acylindrical cathode with internal permanent magnets. This cathode configuration generates a deposition-rate sufficient to meet the required production schedule and 'produces stoichiometric films with good adhesion, low SEY and acceptableoutgassing.…”

“…The coating I on the ferrite surface of the extraction The measured SEY of coated chambers was found to be kicker modules needs to have low SEY,and minimum* dependent on surface roughness [5]. A rougher surface induced eddy'current heating., [4]. :An estimate.of the yields lower SEY values, however these coatings were coating uniformity, was made based on a cosine found'to have a higher outgassing rate than coatings approximation ( Figure 5).…”