- PIMs.
- VMTSA.
- Vacuum modules in LHC experiments
=> In particular there is the very interesting case of the wake-field suppressor
in the VELO (VErtex LOcator) of LHCb. Some pictures:
1,
2,
3,
4,
5,
6,
7,
8,
9,
10,
11,
12, 13, 14, 15,
movie1.
-
Vacuum modules in LHC septa.
-
RF contacts in LHC beam instrumentation.
-
RF contact fingers in LHC ABT equipments.
-
Collimators.
- TCTVB.
- Info on ferrites:
-
4A4.
-
4S60.
-
TT2-111R.
Results of outgassing tests from VSC (CWG, 01/10/2012).
-
Trans-Tech (Ceramics and Advanced Materials).
-
Ferroxcube ferrites.
-
4E2 => Curie temperature > 400 deg C.
- REMINDER FOR THE USE OF RF FINGERS:
1) The RF fingers should be made of Au (or Ag) plated CuBe
(grade C17410) and they should be in contact with a Rh plated material.
2) Au has been used for the PIMs (as it is better for the cold
welding) and Ag for the collimators (as Au cannot be used because of the
bake-out at ~ 250 deg C => Due to the diffusion of the Cu into Au and then the
Au layer disappears). The same problem happens with Ag but at a higher
temperature.
3) In case of bake-out the grade of the CuBe is very
important!
4) SS (instead on Cu-Be, but still Au plated) is used for the
MKI RF fingers because of the bake-out at ~ 350 deg C which would lead with
Cu-Be to a very small residual elasticity of ~ 20% only (see slide 27 of SC's
talk during 3rd meeting).
- REMINDERS FOR VACUUM CONVENTIONS:
1) In VMXYZ,
X describes the flange, Y describes the RF insert topology and Z describes the
body (1 port, 2 ports etc.).
2) Y = A for vacuum pipe diameter 80/80
(standard), Y = B for 63/63 (vacuum valves), Y = C for 63/80 (vacuum valves) and
Y = O for 100/63 (vacuum valves).
3) VA = Vacuum Assembly, VB = Vacuum
Bellows, VC = Vacuum Chambers, VD = Vacuum Dump Lines, VE = Vacuum Bakeout, VF =
Vacuum Flange, VG = Vacuum Gauge, VH = Vacuum Support & Handling, VI = Vacuum
Instrumentation, VJ = Vacuum Seal, VM = Vacuum Modules, VN = Vacuum Cleaning, VP
= Vacuum Pump, VS = Vacuum Screen, VT = Vacuum Tombac / Flexible Hoses, VV =
Vacuum Valve, VW = Warm Beam Vacuum.