Title :
Adsorption study of Al2O3 coating on the pulse septum magnet surface
Author :
Zhang, Hai-Ou ; Pei, Yuan-Ji
Author_Institution :
NSRL, Hefei, China
Abstract :
The surface of pulse septum magnet in HLS was specially coated with Al2O3 powder by plasma spraying. It was found with such magnet in the injection vacuum chamber the pressure was relatively low. To investigate the mechanics 20 sheets of coating were made (120 × 80 × 20 mm2), adsorption capacity was tested. Pore constitution was studied by N2 isotherm method. Results indicated ultimate pressure reduced obviously from 6.4 × 10-5 Pa to 8.6 × 10-6 Pa. Coat adsorption capacity is about 3.68 × 10-4 Pa · 1/cm2. BET surface area is 201 m2/g, Coat is porous and pore is closed at one end. XPS results indicate there are hydroxyl, carboxyl etc., on the surface, and they are most probably related with adsorption.
Keywords :
X-ray photoelectron spectra; accelerator magnets; aluminium compounds; electron accelerators; particle beam dynamics; particle beam injection; plasma arc spraying; Al2O3 coating; HLS; XPS; coat adsorption capacity; injection vacuum chamber; isotherm method; plasma spraying; pore constitution; pulse septum magnet surface; Aluminum oxide; Coatings; Constitution; Powders; Shape; Steel; Surface topography; System testing; Thermal spraying; X-ray scattering;
Conference_Titel :
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the
Print_ISBN :
0-7803-7738-9
DOI :
10.1109/PAC.2003.1289488
