HL-LHC BPM Design
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Assembly drawings
1. Cross check octagonal dimensions --> Michal ⇒ OK
2. Hatching ⇒ OK
3. Total length 270.6 verification and validation --> (Delio and Cedric, confirm that checked) ⇒ OK, agreed on drawings approval and change control
4. Interfaces with beam screen and plug-in module --> (to verify with Cedric and Delio, confirm that checked) ⇒ OK, agreed on drawings approval and change control
5. Add fit diameters between body and transitions ⇒ NOK, but agreed that it's not mandatory
6. BOM: elastic washers SS 301 --> replace with 316L(N) or CuBe ⇒ OK, 316L
7. Headless screw --> Jeveka ⇒ OK, suppliers removed
8. Specify silver coating for the fasteners on the assembly drawings ⇒ OK
9. Delete EDMS reference for the ACC ⇒ OK
10. Pos. 18 and 19 --> move to the 3D view ⇒ OK
11. Add missing threads dimensions on the assembly drawings ⇒ OK
12. Add transitions lengths ⇒ OK
13. Would it be possible to add a beam screen and plug-in modules in dashed lines to one of the views (top left)? ⇒ OK, done, but not associated with the 3D model
14. Amorphous carbon coating is done without installing (list all the positions you don't need during the ACC, electrodes feedthroughs, etc.) ⇒ OK, referred to EDMS with engineering specification
LHCBPMQST_0016
1. D13.5g6 --> check with the hole on the bodies, make sure there is a radial gap min 0.025 mm ⇒ OK, LHCBPMQST_0016 has been modified to accommodate the required gap (Dmitry)
LHCBPMQFT0007
1. 120mm between holes --> reduce position tolerance to 0.05 mm ⇒ OK
LHCBPMQST_A0008 and LHCBPMQST_B0009
1. CF holes depth to be modified to allow min 4 mm material thickness between the conical tip of the hole and the inner surfaces ⇒ OK, the minimum thickness is 3.6 mm (Dmitry)
2. D13.5H7 --> check with the hole on the bodies, make sure there is a radial gap min 0.025 mm, ⇒ OK, LHCBPMQST_0016 has been modified to accommodate the required gap (Dmitry)
3. Position tolerance between CF holes --> reduce to 0.1, move reference "X" to CF gasket cylindrical interface ⇒ OK, done on both drawings (Dmitry)
4. UF feature in top-right view? ⇒ OK, done on both drawings (Dmitry)
5. Check octagonal shape dimensions (difference in the title block and on the drawing's views 112.1 mm vs. 114.1 mm) ⇒ OK, removed from the title blocks (Dmitry)
LHCBPMQST_A0007 and LHCBPMQST_B0002
1. Mount brackets before welding ⇒ OK, discussed with the main workshop, not an option
2. Welding arrow location ⇒ OK
LHCBPMQST_A0003, LHCBPMQST_A0004, LHCBPMQST_B0003, LHCBPMQST_B0004
1. Cross-check octagonal dimensions with VSC beam screen ⇒ OK
2. How inspected (question for MME manufacturing)? ⇒ OK, checked, they do test weld, then cut and inspect. For BPM quality --> visual inspection and CMM
3. 99.55 mm --> check with VSC ⇒ OK
4. RF fingers in three different positions: free, nominal, and max, with stroke value for each ⇒ NOK, but we agreed not to do it.
5. Remove the "before installation" note ⇒ OK, notes removed
6. Hatching ⇒ OK
LHCBPMQST_A0001, LHCBPMQST_A0005, LHCBPMQST_B0005, LHCBPMQST_B0007
1. Why do we need R1? Such a big radius? ⇒ OK, R reduced
2. Holes D5.4 --> D5.6 ⇒ OK, done
LHCBPMQST_B0031
1. Change material to 316L --> SCEM 44.59.20.150.0 ⇒ OK, done
2. Remove tolerances ⇒ OK, tolerances updated and explained
LHCBPMQST_B0030
1. a-->b tolerance? ⇒ OK, tolerances explained
Tube brackets:
1. Change material to 316L(N) ⇒ OK
D2 BPMs Body
1. Check D of a copper gasket ⇒ OK, dimensions are as per catalogue
2. Localisation of asset number plate holes ⇒ OK, dimension added
3. Milling of the surface for the asset number plate ⇒ OK, dimension added
4. Check options to have bigger wall thickness (see view G-G) ⇒ OK
5. Increase tolerance for the cooling tube interface hole ⇒ OK
Transitions LHCBPMQBC_A0002 vs. LHCBPMQST_A0003
--> we would like to understand the difference in assembly processes between A/B type and D2 type octagonal transitions, and possibly select one configuration but let's discuss ⇒ OK, design inherited from TE-VSC
LHCBPMQBC_A0004
1. holes diameters 5.4-->5.6 ⇒ OK
LHCBPMQST_A0002
Question about UZ - offset zone ⇒ OK, explained
LHCBPMQST_B0027
Check with Fritz ⇒ OK, done