Paper Information

Title: 

SIMULATION OF A HEMISPHERICAL DEFLECTOR ANALYZERS AND FRINGING FIELD OPTIMIZATION

Type: PAPER
Author(s): MOGHBELALHOSSEIN MOJTABA,GANJALIVANDI GHAMARI ESMAT
 
 
 
Name of Seminar: NATIONAL VACUUM CONFERENCE IRAN
Type of Seminar:  CONFERENCE
Sponsor:  ANJOMANE KHALA IRAN-DANESHGAHE SHAHID BEHESHTI AHVAZ
Date:  2014Volume 6
 
 
Abstract: 

THE ENERGY RESOLUTION OF A HEMISPHERICAL DEFLECTOR ANALYSER (HDA) CAN BE SUBSTANTIALLY IMPROVED BY USING ITS ENTRY FRINGING FIELDS ADVANTAGEOUSLY, RATHER THAN TRYING TO ELIMINATE THEM, THE TRADITIONAL APPROACH. THE INTRINSIC LENSING PROPERTIES OF THESE FRINGING FIELDS, AS SHOWN IN SIMULATIONS, ARE ABLETO NOT ONLY RESTORE, BUT EVEN IMPROVE FIRST-ORDER FOCUSING AT THE 180O DEFLECTION PLANE IN A CONTROLLED WAY, WITHOUT THE USE OF ANY ADDITIONAL FIELDCORRECTION ELECTRODES. THIS IS ACCOMPLISHED BY CHANGING THE ENTRY RADIUS R0AND BIASV (R0) FROM THEIR CONVENTIONAL VALUES OF R0=`R, THE MEAN RADIUS `R=(R1+R2) /2 AND V (R0) =0 TO NEW VALUES R0>`R WITH V (R0)<0 ORR0<`R WITHV (R0)>0.

 
Keyword(s): HEMISPHERICAL DEFLECTOR ANALYZERS, FRINGING FIELD, RESOLUTION
 
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