Study of the impact of the remote alignment in the vacuum system

Transcription

1 Study of the impact of the remote alignment in the vacuum system R. Rego, V. Baglin, J. Hansen CERN, 24 th September 2018 EDMS:

2 Outline 1. Introduction 2. Inner triplet area 3. TAXN-D2 area 4. Crab Cavities area 5. Q4 area 6. Q5 area 7. Overview of WP12 proposal for remote alignment 8. Summary 2

3 1. Introduction 3

4 WP12 baseline as of Feb 2018 The components along the LSS have to be rigidly displaced during the alignment. Remote alignment up to Q5 included (i.e. Q5-Q6 & Q6-Q7 areas excluded). Inner triplet, D1, TAXN, D2, Q4, Q5 & crab cryomodules (CCs) are remote aligned from the CCC (within ± 2.5 mm) [1]. Cost of 1.7 MCHF. However, following a detailed study, this previous solution is no longer valid due to hardware and possible costs issues!!! 4

5 Updated baseline under study The components along the LSS have to be rigidly displaced during the alignment. Remote alignment up to Q5 included (i.e. Q5-Q6 & Q6-Q7 areas excluded). TCTH&V, TCLX and TCL5 are now remotely aligned. TCLMB 4 & 5 masks are now remotely aligned. Inner triplet, D1, TAXN, D2, Q4, Q4 mask, Q5, Q5 mask & crab cryomodules (CCs) are remote aligned from the CCC (within ± 2.5 mm) [2]. Inputs: Vacuum equipment around the collimators are supported by the collimator (except VABs). Following recent discussion VABs are not embarked with any other equipment: VABs are installed in there own (remotely aligned or not) support. 5

6 Implementation means for vacuum modules Standard RF bridge with RF fingers with stroke up to +/- 2 mm [3]: Compatible with all fixed components or all remote. Standard RF bridge Deformable RF bridge (DRF) must be used for alignment displacements up to +/- 2.5 mm. ID 63 DRFs have the same volume as LHC like VM. However, due to their design, ID 80, 91 and 100 DRFs have much larger volume than the respective LHC like VM (flange size, outer diameter and length). Impact on HL integration Deformable RF bridge Reference [2] 6

7 Implementation means: new VAB supporting system Two types of supporting system. Type 1 is made of a new VSC interface platform between the support and the valves/vms assembly Under study by WP12 New interface with the support which allows. To align each beam line independently. Fiducialisation by Survey team. Type 2 is made of both the new VSC interface platform together with the SU remote alignment platform Includes resident motors and sensors to allow remote alignment. Test on performance with present remote aligned platform is required to assess robustness with respect to force exerted by the sector valve. In case of failure, the remote aligned platform has to be redesigned by VSC. Remote aligned SU platform 7

8 Cost estimates for the new VAB supporting system Type 1 Support and VSC interface platform: 11 kchf. Alignment targets: 2*4*0.5 = 4 kchf. Total = 15 kchf. Type 2 WP12: Support, VSC interface platform and alignment targets: 15 kchf; Survey platform (including joints and knobs): 5 kchf; Total for WP12: 20 kchf. Note: To be procured and delivered by WP15.4: Resident motors: 10.5 * 5 = 52.5 kchf; Sensors kit: 40 kchf; Total for WP15.4: 92.5 kchf. Total for type 2: 115 kchf. Alignment knobs shall be easily accessible. Sensors kit includes: 2 WPS sensors + 1 inclinometer + 1 rack + acquisition system + cable + cable pulling, etc.. 8

9 Clearance definition Clearance is used by WP12 to quantify the gap or overlap between the beam and the vacuum equipment: Clearance values are expressed along the radius Gap clearance > 0; Overlap clearance < 0. Clearance takes into account all the parameters that influence the positioning of the inner part of the vacuum component with respect to the beam: Mechanical tolerances: Gaskets, flanges, inner surfaces, etc.; Alignment tolerances; Vacuum equipment offset; Beam size; Beam offset; Remote alignment transversal stroke (+/- 2.5 mm), which includes ground motion [3]. HC: minimum horizontal local clearance in mm. VC: minimum vertical local clearance in mm. 9

10 Objective of the present document Present for each area the presently more suitable layout which fulfill the required performance according to the update baseline under study (slide 5). We are aiming at filling-in the table below by the 26 th September following our proposal acceptance. 10

11 2. Inner triplet area 11

12 Manually aligned VABs BPM fixed and with ID 150 mm. Vacuum equipment is not motorized. VAB with new VSC interface platform (type 1). Total 1 VVG + 1 new VAB support type 1 already in the WP12 baseline. 1 DRF to be added to WP12 baseline. 12

13 3. TAXN-D2 area 13

14 Remotely aligned D2 VAB VAB with the new VSC interface platform and with the SU remote alignment platform (type 2). BPM moved into D2. The implication on the final layout is still under study. Total 2 VVG already in the WP12 baseline. 3 Vacuum chamber + 1 VM + 1 DRF + 1 Survey platform for type 2 support + costs of changes due to BPM displacement into D2 to be added to WP12 baseline. Motors + sensors kit by WP

15 Impact on the layout Vacuum chamber supported by the collimator. 2 new vacuum chambers in the place of the BPMs (if they move). Single bellow VM (300 mm), so that this can be supported by the collimator. Which implies an addition of a vacuum chambers of 220 mm. Longitudinal space changes: VVGs staggered (New VAB length of 780 mm); VM with DRF; Implication of BPM displacement into D2 to be studied (see next slide). Note To ease the VM design, the reduction of the TAXN aperture, may allow keeping the Y chamber flange size to DN

16 BPM displacement into D2 Implications for WP12 due to BPM displacement into D2: Longitudinal space changes that might affect the space to accommodate the VAB; Extra cost of minimum 100 kchf (up to this date, for the 4 IPs) to be added to WP12 baseline. Reference [6] 16

17 4. Crab cavities area 17

18 Remotely aligned D2 VABs D2 VAB with the new VSC interface platform and with the SU remote alignment platform (type 2). Vacuum chambers (VCs), between D2 and the CCs, must be remote aligned (in study). VCs embarked with the VAB. Total 2 VVGs already in the WP12 baseline. 1 Survey platform for type 2 support to be added to WP12 baseline. 8 VVGs + 4 DRF + 2 new vacuum chambers + 2 flange transition pieces already included in the WP4 baseline. Motors + sensors kit by WP

19 Impact in the integration layout Change CCs sector valves (VVGs) flanges, form DN100 to DN150. Longitudinal space changes: Sector valves on the VAB have to be staggered (New VAB length 780 mm); Use of transition flanges after the VMs (with DRF) upstream of the CCs; Use of VMs with DRF. 19

20 5. Q4 area 20

21 Manually aligned Q4 VABs VAB with new VSC interface platform (type 1). Total 4 VVGs + 2 new VAB support type 1 already in the WP12 baseline. 8 DRF + 12 flange transition pieces to be added to WP12 baseline. Note: In order to gain margin in the clearance at the VAB, in the IP side of Q4, one can realign the VAB, when needed, during a long shutdown. 21

22 Impact in the layout Use of flange transitions pieces: DN 100 to DN 150 in the VAB (downstream Q4) and on the VM next to the VC/Beam equipment downstream; DN 100 to DN 63 in the flange connections with Q4. Longitudinal space changes. Note: In case of a conflate flange, a space of 55 mm, between the Q4 mask and its flange, needs to be provided. This space will allow the assemble of the bolts. 22

23 6. Q5 area 23

24 Manual aligned Q5 VABs VAB with new VSC interface platform (type 1). Total 4 VVG + 2 new VAB support type 1 already in the WP12 baseline. 2 vacuum chamber + 4 VM + 8 DRF + 12 flange transition pieces to be added to WP12 baseline. 24

25 Impact in the layout Vacuum chamber supported by the collimator. Single bellow VM, so that these can be supported by the collimator. Which implies an addition of a VC of 220 mm. Use of flange transitions pieces: DN 100 to DN 150 in the VAB (downstream Q5) and on the VMs downstream of the collimator; DN 100 to DN 63 in the flange connections with Q5. Longitudinal space changes. Note: In case of a conflate flange, a space of 55 mm, between the Q5 mask and its flange, needs to be provided. This space will allow the assemble of the bolts. 25

26 7. Overview of WP12 proposal for remote alignment 26

27 WP12 proposal Remotely aligned Manually aligned Manually aligned but with new VSC platform Possibly: moved to into D2 or with VAB 27

28 8. Summary 28

29 Summary For each region, a systematic study was done to identify a proposed strategy compatible with remote alignment transversal stroke (+/- 2.5 mm): LHC type VAB (i.e. no remote alignment): Q6; Q7. Manually aligned VABs (type 1): D1; Q4; Q5. Remotely aligned VABs (type 2): D2. All the clearance values where positive for this solution. Nevertheless, it is worth to underline that any changes in the beam size and offset values may impact the present proposal (the data for the beam size was provided by WP2 in May 2018 [5]), as well as, component displacements. 29

30 References [1] Preliminary study of the impact of the remote alignment system in the vacuum system, EDMS: v.3. [2] Alignment: is this an issue for HL-LHC? Or How can we profit as maximum from our investment in alignment?, P. Fessia, Chamonix, 2018.] [3] Full Remote alignment study (FRAS), HL-LHC integration meeting, 13 April [4] Proposed Methodology for vacuum equipment mechanical aperture computation, EDMS [5] VM counting (P1 and P5), 07/05/2018, 16:06 hours, private communication. [6] d2, 02/10/2018, 14:36 hours, private communication. 30

31 WP12 actions Layout implementation in coordination with WP15; Fill-in the table for the 26 th of September; Discuss in detail with WP15.4 the performance of the SU platform, in particular the case of the vacuum force applied on the survey system; To optimize the cost, clarify in coordination with WP2 the impact of the DRF on the full HL-LHC impedance budget as a function of number of DRF, length, angle, etc.. Have a functional specification validated by WP2. 31

32 Thank you for your attention Particular thanks to: TE-VSC: C. Garion, R. Pedersen, T. Henry EN-SMM-HPA: H. Durand, A. Herty BE-ABP-HSS: Riccardo de Maria 32

33 Backup slides 33

34 Survey platform Manual Without standardized platform more difficult and more time consuming Plug-in motors Alignment by wire Remote Resident motors and sensors Reference [2] 34

35 Key messages (EN-SMM) parameters radial vertical (mm) fiducialisation ground motion per year IP movement per year experiment to accelerator predictable + measurements predictable Smoothing of components before interconnecting them will guarantee very little initial offset. Manufacturing tolerances have to be respected. Motor range > worst case IP offset + ground motion 2.5 mm > 2.0 mm mm FRAS 13 April

36 D1 VAB clearance VVG No problem of aperture. No problem with flange due to use of DRF. DN 200 for VVG and VMs. VM upstream No problem of aperture. VM with the DRF (downstream) End flange (orange) connected to the remotely aligned D1. Component Clearance [mm] IP [m] Detail H V DN DRF VS RF VAxyz Vaxyz - Sector Valve IE VAxyz Start VM ID End VM ID Start VV ID End VV ID Start VM ID End VM ID RF - DRF Note: - Slight change in the IP values when taken into account the DRF length restriction. 36

37 VVGs VMs No problem of aperture. No problem of aperture. D2 VAB clearance Because this VAB is remote aligned, the value of the beam correction (+/- 2.5 mm), when computing clearance, is set to zero. Component Clearance* [mm] Detail IP [m] Interior Exterior DN Interior Exterior Interior Exterior H V H V D2 Start Start D2 End End VAB (VMxyz) Start Start VM ID 100 VM ID VAB (VMxyz) End End VM ID 100 VM ID DRF VS RF RF VAB- Sector Valve (VVGSH) VAB (VMxyz) Start End VAB- Sector Valve (VVGSH) Start End VV ID 100 VV ID 100 VV ID 100 VV ID Start Start VM ID 100 VM ID VAB (VMxyz) End End VM ID 91 VM ID RF 37

38 D2 VAB clearance VVGs VMs No problem of aperture. No problem of aperture. Because this VAB is remote aligned, the value of the beam correction (+/- 2.5 mm), when computing clearance, is set to zero. Clearance [mm] Component Detail IP [m] Interior Exterior DN Interior Exterior Interior Exterior H V H V Start Start VM ID 80 VM ID VMxyz VMxyz End End VM ID 100 VM ID DRF VS RF RF VAB- Sector Valve (VVGSH) VMxyz D2 Start End VAB- Sector Valve (VVGSH) Start End VV ID 100 VV ID 100 VV ID 100 VV ID Start Start VM ID 100 VM ID VMxyz End End VM ID 100 VM ID Start Start D2 End End RF 38

39 VVGs VMs No problem of aperture. Q4 VABs clearance Flanges in orange connected to the remotely aligned Q4 and Q4 mask. Problem with flange (yellow), which leads to the use of transition flange pieces. Clearance [mm] Component Detail IP [m] Interior Exterior DN Interior Exterior Interior Exterior H V H V Start Start VM ID 80 VM ID VAB VAB End End VM ID 63 VM ID VAB- Sector Valve (VVGST) VAB Q4 VAB VAB- Sector Valve (VVGST) VAB Start End VAB- Sector Valve (VVGST) Start End VV ID 63 VV ID 63 VV ID 63 VV ID Start Start VM ID 63 VM ID VAB End End VM ID 63 VM ID Start Start Q4 End End Start Start VM ID 63 VM ID VAB End End VM ID 63 VM ID Start VAB- Sector Start VV ID 63 VV ID End Valve (VVGST) End VV ID 63 VV ID Start Start VV ID 63 VV ID VAB End End VM ID 80 VM ID DRF VS RF RF - DRF DRF - DRF 39

40 Q5 VABs clearance VVGs: VMs: No problem of aperture. Flanges in orange connected to the remotely aligned Q5 and Q5 mask. Problem with flange (yellow), which leads to the use of transition flange pieces. Component Clearance [mm] Detail IP [m] Interior Exterior DN Interior Exterior Interior Exterior H V H V VADHA Start VADHA Start VM ID 80 VM ID (VMACC) End (VMAND) End VM ID 63 VM ID VADHA - Sector Valve (VVGSH) VADHA (VMABD) LQYHC.L5 VAB VAB- Sector Valve (VVGST) VAB Start End VADHA - Sector Valve (VVGST) Start End VV ID 63 VV ID 63 VV ID 63 VV ID Start VADHA Start VV ID 63 VM ID End (VMAOC) End VM ID 63 VM ID Start Start LQYHC.L5 End End Start Start VM ID 80 VM ID VAB End End VM ID 63 VM ID Start VAB- Sector Start VV ID 63 VV ID End Valve (VVGST) End VV ID 63 VV ID Start Start VM ID 63 VM ID VAB End End VM ID 63 VM ID DRF VS RF RF - DRF DRF - RF 40

41 VM with DRF ID Left FLANGE Right Operation al LENGTH (mm) ST NUMBER (1) 63 (1) DN 100 UHV ROT. DN 100 UHV FIX (340) ST (2) DN 150 UHV ROT. DN 100 UHV FIX (340) ST (2) 80 (3) DN 150 UHV ROT. DN 150 UHV FIX (340) ST (4) 150 (5) DN 150 UHV ROT. DN 200 UHV ROT. DN 150 UHV FIX DN 200 UHV FIX (340) ST (340) ST (3) (5) (4)

42 Survey platform cost estimation PU [kchf] Survey Platform Number per platform Cost [kchf] Motor Platform Sensors kit* Total: 97.5 * 2 WPS sensors + 1 inclinometer + 1 rack + acquisition system + EL cable pulling, etc. - By Helene Durand 100kCHF 42

43 Remote alignment brief description The target is to equip of remote alignment capability all the equipment between the Q1 and the Q5 included In the present HL-LHC baseline several of the equipment/system are equipped, but as there are missing elements There is no possibility to use the system as an operational tool The tunnel human intervention for alignment is still required in TS with impact on physics time and on exposure of teams to radiation Originally it was not specifically stated that it could be used At cold In operational conditions With pilot bunches We target to provide ± 2.5 mm capability of remote alignment on all the components Larger alignment window will be accessible via manual intervention in the LS The ± 2.5 mm would not be necessary available between continuous element in opposite direction (+2.5 and -2.5 mm) because of the limitation of the interconnecting bellows. Interlocks shall be introduced We need to introduce a datalog to follow the resulting position of the bellows after re-alignment We need still to discuss how to approach very hot elements to avoid intervening also in the LS Interlocks reacting to various beam conditions have to be defined and implemented probably with various levels Cold machine Pilot bunch Dangerous beam 05/09/

44 Alignment Scenario First year of operation would require Correction by remote alignment after initial luminosity to compensate for potential large IP offset because of the experiment/machine assembly incertitude Correction with human intervention in the tunnel at first YETS to recover the full 2.5 mm of remote alignment capacity From year two ground motion is compensated on an annual basis (or in the zones potentially affected by the HL CE more often if needed) Man intervention in the tunnel shall be limited at the LSs to recover the full 2.5 mm remote alignment stroke wherever possible. Alignment strategy Ground motion is corrected individually to the components or on groups Local ground motion (approx. 10 m zone) will roughly be the same, thus girder options can be considered In case an IP shift is needed, all components of the LSS are shifted from Q1 to Q4 by the amount needed. 05/09/

45 investigated zones - overview manual baseline survey platform TAXS BPM to be moved inside D2 QQS DFX BPM SV TAXN CRAB CAVITIES MASK Q4 MASK Q5 05/09/

46 D2 VABs Both ID 100 VVGs need to have the actuator up. VM with RF fingers. New total length 780 mm. 40 mm 270 mm 85 mm 290 mm 134 mm Cold Side VC VM VM V V G V V G VM VM VC Warm Side 134 mm 270 mm mm mm 94 mm 46

47 DRF ID 63 to ID 80 DN100 (In study) Note: Implies reduction of flange transition pieces. 47