Before the IB tower venting the PMC has been let scanned at 4 Hz (plot 3)
I took profit to assess the TEM01 & TEM02 contribution to the neoVAN beam.
Better than the "rough" alignment attempt of log entry 42043 this should say more preciselly what could be the available power at the PMC transmission
- Measure at PMC_T (plots 1 & 4)
TEM01 = 10,01 % of the TEM00 (measured in transmission)
TEM02 = 2,22 % of the TEM00 (measured in transmission)
--> PMC_TRA = 61,68 W/V* 0,99 V *[ ( 1 + 0,022 + 0,1001 ] = 68,57 W
(61,68 W/V is the calibration of the signal PMC_TRA_DC from the PMC diagnobox, see 41060)
- Measure at PMC_R (plots 1 & 4)
TEM00 = 2,4972 V / 3,215 V = 77,67 % of the overallreflectedpower (measuredin reflection)
TEM01 = 7,90% of the overallreflectedpower (measuredin reflection)
TEM02 = 1,43% of the overallreflectedpower (measuredin reflection)
--> Modal Content = 87,0 %
- Piezo sensitivity (plot 2)
1 PMC FSR is scanned with 0,2607 V read at PZT_Monit (which is 1/20 of the voltage on the piezo)
--> S_pzt = 35,96 MHz / V
FSR = c/1,6 m ~ 187,5 MHz
