Gabriel Palacios gabrielp@jlab.org 09/04/18 Tests for Joe Gabriel Palacios gabrielp@jlab.org 09/04/18

Models: T-cathode I produced field maps in CST for the T-shape cathode for 3 cases: Cathode at -100 kV anode at 0 kV Cathode at 0 kV anode at -0 kV Cathode at -100 kV anode at -10 kV Then I ran three different simulations on GPT to check superposition of E-fields: Simulation with the 100_0 field map Simulation with the 100_0 field map and 0_100 field map (called one after the other in the *.in file) Simulation with the 100_10 field map

Cathode-anode gap: Not mushroom but T-shape, though! The data for the following plots was taken along the cathode anode gap as a function of the height (on the photocathode surface) varying from -6mm to 6mm. Not mushroom but T-shape, though!

Transverse vertical field maps

GPT results: Transverse electric field – T-shape

GPT results: Transverse electric field – T-shape

GPT results: Transverse electric field – T-shape

GPT results: Transverse electric field – T-shape

GPT results: Transverse electric field – T-shape

GPT results: Transverse electric field – T-shape

GPT stuff

NEMI_Y_RMS BUT, BUT, BUT!? SUPERPOSITION PRINCIPLE!

Then? How to recover Ey after GPT solves? To check if:

False color abs-E

100-0

0-10

100-10

Fin.

CST frame of reference: y x z X goes into the page.