ANX_10_RF – Field notes
EU XFEL Build #1 R4
11/13/14 Dale Miller
3.3 In-situ baking
At the end of the in-situ baking all volumes of the coupler assembly must present a vacuum level of
10-7 mbar (7.5E-8 Torr) or less at the end of the baking while the temperature in the oven
is still 130°C.
Warm-in
CPC
Warm-out
11/4/14
11/4/14
11/4/14
11:45
11:45
11:45
8.1E-8 Torr
8.0 E-7 Torr
7.9E-8 Torr
First measurement by the RGA after in-situ baking must present H 2 as the major component. Second
in quantity should be CO+ (~20% less than H 2 ). H 2 O+ should be of the order of 50 times less than H 2 .
No atomic mass above 50 should be within 100 times lower than the measure quantity of H 2 . Vacuum
level during this measurement must be 5.10-9 mbar ( 3.7-9 Torr ) or less. The RGA measurement is
applied to all three volumes separately. Vacuum level during this measurement must be 5.10-9 mbar or
less (eq. N2).
The measurement is performed as close as possible to the pumping port, with an ionic pump starcell
VacIon Plus 20 (20 l/s).The quadrupole mass analyser must allow the measurement of up to 200 100
amu (atomic mass unit) with a good sensibility (using a channeltron amplifier).
3.5 Vacuum level
At the end of the conditioning procedure all three volumes of the coupler pair assembly must present a
vacuum level of 1.10-7 mbar (7.5E-8 Torr) or less. In case this limit is not achieved refer to §3.6.
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RGA procedure
1.
2.
3.
4.
5.
6.
7.
Power off ion pumps
Open oven
Disconnect N2 and H.V. cables
Move to “Tent”
Connect to H.V. cables, and RGA head and cables
Turn on ion pump power supplies
Log pressures from ion gauge controllers
Time
RF-in
CPC/hoses/RGA
RF-out
11:05
1.00E-11
3.20E-09
1.00E-11
8. Turn on-RGA and allow to outgas (~2 hours over lunch, pressure increased slightly with ambient
temperature)
9. Log CPC pressure from ion gauge controller
Time
RF-in
CPC/hoses/RGA
RF-out
13:26
1.00E-11
8.80E-09
1.00E-11
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
Run scan on CPC volume
Turn RGA off and save file
Close valve to CPC
Open valve to RF-in
Turn RGA on, let warm up for 5 minutes
Record pressure from ion gauge controller
Time
RF-in
13:32
3.00E-9
Hoses/RGA +
RF-in
6.60E-09
RF-out
1.00E-11
Run scan on RF-in volume
Turn RGA off and save file
Close valve to RF-in
Open valve to RF-out
Turn RGA on, let warm up for 5 minutes
Record pressure from ion gauge controller
Time
RF-in
13:47
6.60E-10
Hoses/RGA +
RF-out
6.40E-09
RF-out
2.80E-09
Run scan on RF-out volume
Turn RGA off and save file
Close valve to RF-out, and open valve to CPC
Remove RGA control unit and cables
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Data
RGA scan files
Volume scanned
CPC
RF-in
RF-out
File name
Monitor, Position 1, RGA MPH100M 70062311, 011-05-2014 19'07'30
Monitor, Position 1, RGA MPH100M 70062311, 011-05-2014 21'33'51
Monitor, Position 1, RGA MPH100M 70062311, 011-05-2014 21'47'49
CPC, manifold and bellows
11/5/14 1:22 PM
RF-in, manifold and bellows
11/5/14 1:39 PM
RF-out, manifold and bellows
11/5/14 1:52 PM