Vacuum issues from the integration perspectives

C. Collazos, J.P. Corso P. Fessia, C. Magnier, Y. Muttoni, S. Weisz.

With the contribution of WP3 and WP4:E. Todesco and R.Calaga, O. Capatina, T. Renaglia

General remarks• Radiation level will increase everywhere. Therefore

vacuum equipment installation shall also target to prevent and limit personnel exposure. This means– Reliability– Avoiding very hot areas (TAS-Q1)– Optimizing for maintenance activities

• Electronics should take into account the HL-LHC radiation level

• Evaluation of the remnant dose and dose to the electronics are being triggered by the integration working with RP and WP10

Insulation vacuumMany cryogenic equipment will be installed adding volume and new elements to the insulation vacuum system– Magnets: IR1, IR5, IR6– SC links (with the feed boxes): IR7, IR1, IR5– new cryogenics: IR4, IR1, IR5– RF (crab, 200 MHz, 400 MHz): IR1,IR5,IR4

IR4• LS2: new cryogenic system will be added in order to

provide margin, flexibility and redundancy separating the magnet sector from, the RFs. The vacuum system shall allow (at least) the same type of manipulations as the cryogenics (separate cool down and warm up…. Possible internal sectorization of the RF area to be still analysed)

• LS3: many new equipment will be added and in particular new type of RF superconductive cavity could be installed (200 MHz, 800 MHz). The vacuum lay-out and sectorization shall allow easiness of intervention and maintenance. Study in progress.

IR 4 L a very conceptual view

BSRT 20 m

E- lenses

6 m

800 MHZ 15 m 200 MHZ 8

m

ISC 1 ISC 2

H.B.F.SISC 3

BGV 20 m

IR 4 R, a very conceptual view

ISC 2 ISC 1

800 MHZ 15 m

E- lenses

6 m

200 MHZ 8

m

BPM

H.B.F.S ISC 3

BGV 20 m

IR1 AND IR5PLOTS FOR IR5 RIGHT ONLY

IR5 IS MOST DIFFICULT FOR INTEGRATION

The integration lay-our proposed here is not matching HL-LHC optics V1.0 being already an evolution that try to deal with integration issues and to be a starting point for the next optic version. In particular- 4 pairs of crab cavities divided in 4 cryo modules for maximum reliability and

allowing to use the maximum of the SPS design (ODU cavity taken as option being the longest)

- Protective masks- Different lay-out of the correctors in the D2-Q4 area- Shorter D2- Beam Instrumentation requestsIt is an on-going work, it has not yet gone through any approval processes Incoherencies could be present

The inner triplet area

From D1 to D2LRBBWC placed in arbitrary with the largest volume provided, it is a memento not a space reservation

D2 to Q5

Zoom on crabHL-LHC V1.-0

4 cryo-modules, 4 jumper on machine side (2 on QRL side ?) warm to cold transition and sectorisation valves for vacuum

between each pair of modules

Q5 to Q7

The DFB will be a new object this is only a

“virtual image”

A small list of possible open issues• DS collimator– The short cold->warm->cold transition between two

D11T with a collimator in the middle • The Beam-Beam compensator and the hollow

lenses• New TAN and TAS in IR8