User's Manual

TES-63 Source
User manual – version 06/2021
Page 18/46
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4.4 Getting hardware ready for the first beam
The control software must be installed before in order to be able to operate the ion source. Please
refer to the software installation section.
CAUTION
Never operate the source (do not put it under High Voltage nor send any UHF power to
it) when the source is at atmospheric pressure.
a) Evacuate
Pump down the system.
Wait for the pressure to reach 1∙10
-6
mbar before operating the source for the first time.
Wait typically 1h for proper outgassing, limit void base pressure can only be reached if
outgassing is finished.
Perform a leak check of the CF flange if the limit void base pressure cannot be reached
within the usual expected time given the turbopump pumping speed.
b) High Voltage conditioning
CAUTION
Perform a progressive voltage ramp up conditioning before the first utilization
WARNING
NEVER DISCONNECT THE HIGH VOLTAGE CABLES WHEN THE CONTROL RACK IS
OPERATING.
Procedure for conditioning the source before generating the first ion beam:
1. slowly ramp up the High Voltage while monitoring the supply current (1)
2. stop when the supply current spikes and reduce the voltage until the spikes disappear (2)
3. wait a few minutes and then slowly increase the voltage again (3)
Repeat the above procedure until the desired voltage level has been reached with a stable supply
current (4).
(1) high voltage steps of 300V, do the ramp 300V in 5 seconds.
(2) spikes of tens of µAmps, with typically 1s duration, there can be several consecutive spikes.
(3) same high voltage steps as (1)
(4) no spikes over a few minutes operation.