lss review: bt injection systems (lss8r(l), 2l(r))): v.mertens + ti’s (lss part)

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LSS Review: BT

Injection systems (LSS8R(L), 2L(R))): V.Mertens + TI’s (LSS part)

Tune/aperture kickers (LSS4L): V.Mertens

Beam dumping system (LSS6L, 6R): B.Goddard

With input and support from

AB / ABP: M.Gevrey

AB / BT: L.Ducimetière, W.Weterings

AT / MEL: D.Gerard, D.Smekens

AT / VAC: J.M.Jimenez

TS / IC: K.Foraz

IRR for injection systems presented at TCC in September 2005http://lhcp.web.cern.ch/lhcp/tcc/planning/tcc/Minutes/Mins2005/tcc2005-09/tcc2005_09.pdf

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beam (ring 1)

+ instrumentation BTVSS, BTVSI, BTVST

+ TCLIM

LSS Review: BT / V.Mertens / 29.3.2006

Injection system (LSS2L, schematic)

(M)

3 LSS Review: BT / V.Mertens / 29.3.2006

TI 8 layout (in LSS region)

MBIAH MQI, MCIA, TCDI, TCDIM

MQI MCIA

MQI MCIA

MQI, MCIA, TCDI, TCDIM,

BTVI+ other instrumentation (BPMI, BLMI)

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Equipment + groups involved (focusing on LSS installation)

AB / ATB TCDI Transfer line collimator (3 + 3)TCDIM Shielding associated with TCDI (2 + 2)TDI Injection beam stopper (1 + 1)TCDD Mask (mobile, LSS2L) associated with TDI (1)TCDDM Mask (fixed, LSS8R) associated with TDI (1)TCLIA Auxiliary injection collimator (1 + 1)TCLIB Auxiliary injection collimator (1 + 1)

AB / BI BPMI Beam position monitors (3 + 3)BTVI Beam screens (1 + 1)BLMI Beam loss monitors (a few)BTVSS Beam screen downstream of MSI (1 + 1)BTVSI Beam screen up-/downstream of MKI (2 + 2)BTVST Beam screen upstream of TDI (1 + 1)

AB / BT MKI Injection kickers (4 + 4)TCLIM Mask associated with TCLIB (1 + 1)

AB / CO WIC Warm interlock controllers (magnet temp. surveillance)FCCM Fast magnet current change monitorsBIC Beam interlock controllers

AT / MEL MQI Main quadrupoles (x + 3)MBIAH Recuperated dipoles (B340) (LSS8R: 7)MBIBH Recuperated dipoles (B280) (LSS2L: 6)MCIAH/V Correctors (x + 6)

MSIA Injection septa (2 + 2)MSIB Injection septa (3 + 3)

AT / VAC Remaining TI 2 + TI 8 parts (ca. 2 x 0.12 km), special gear for injection equipment

• Legend: (#LSS2L + #LSS8R)

• Spares not included

• TI 2, 8 outside LSS not included

R.Assmann

C.Fischer


opposite side of the insertion

opposite side of the insertion

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TI 8


TI 8 magnets installed (I)

UJ88

MBIAH

TI 8


TI 8 magnets installed (II)

MCIAV

TI 8

LHC

TCDIH87904MQI

UJ88

MBIAH

Layouts updated and integration re-checked in 06/2005


TI 8 magnets installed (III)

MCIA TI 8

LHC

MQI

RH87


TI 8 magnets installed (IV)

MQIMCIAV

RA87

TCDIV88123

TCDIH88121

TI 8

LHC

Remaining works (apart from vacuum):

• Alignment/re-alignment from MBIBV87715 + downstream: April

• Installation of cable descents, cabling: starting now

• Water connections: intended to start this week (DS)

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TI 8 vacuum system

• ~ 120 m remain to be installed

• Detailed layout exists

• Additional vacuum valve just at end of TI 8 (disentangles TI 8 works from LHC)

• No vacuum window added (not good for emittance)

• Rather differential pumping (similar to start of dump lines) + some NEG parts

• Hardware in preparation

• Equipment will be “ready when needed”

• Installation planned by Russian team as of June

• Work can be done with LHC in front of it

AT / VAC (J.M.Jimenez)


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TI 8 vacuum system, cont’d

Some special cases have been looked at a long time ago.

Q6


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IR8 injection system

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Septum magnets (MSI)

MSIA

MSIB

injected beam

circulating beams

AT / MEL (D.Gerard)

• All magnets since long at CERN

• Currently supports being installed

• Installation of 3 MSIB + 2 MSIA foreseen during 2 weeks, starting 3 April

• Vacuum chambers still to be inserted

• Presently testing special vacuum chambers + procedures on magnet # 1

vacuum intermodule


bakeout tests

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Injection kickers (MKI); layout (LSS8R)

MKI magnets

beam (ring 2)

electronics

electronics

RCPS

RCPS

PFN

PFN

transmission lines

UA87

RA87

AB / BT, L.Ducimetière

Q4

Q5

vacuum valves


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MKI

cell assembly

magnet, nearly assembled

injected beam

circulating beams

• All 4 MKI for LSS8R assembled and inserted into their vacuum tanks.

• Presently inserting magnet # 7 and starting assembly of magnet # 8.

tank before closure


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MKI, cont’dHV test cage with series PFN and series magnet

prototype

Preparation: ~ 150 h bake-out cycle (at 300 °C) + ~10 days HV conditioning to reach nominal voltage

~ 3 – 4 weeks turn-around time to see the effect of modifications (while other magnets can use the chain …)

Constraints: 1 oven, 1 HV test stand, work interleaved with preparation + testing of other series components)


Bakeout oven

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MKI status, beam screen

Magnets very good from basic HV and vacuum viewpoint (after lots of preparation work)

Long learning curve for 1st generation of beam screens (3 m long ceramic tube; stripes etched from inside into metallic paint)

With that sparking inside beam screen at quite low voltages (not inside magnet as such) bad effect on vacuum at higher voltages, field (?), …

Devised new type of screen end of last summer

Magnet # 1: Still sparking above 80 % of nominal voltage (which is 54 kV PFN); magnet kept under vacuum after test

Magnet # 2: Result as # 1 (with identical configuration); magnet under vacuum

Magnet # 3: 9 wires less than # 1, near end of HV conditioning, reached > 55 kV PFN yesterday

Magnet # 4: Wires as # 3 + better wire “geometry” + additional damping resistor; in bake-out, HV result expected by mid April (should “normally” be better than # 3)

At least a “startup solution” seems now at hand.

(reduced wire configuration checked for impedance: “factor 3 increased power”; t.b.c.)

F.Caspers, T.Kroyer


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MKI status, beam screen issue

Strategy:

If magnet # 4 performs as # 3 (or better), equip # 1 and # 2 as # 4 (1-2 weeks).

Install all 4 magnets in LHC, without (?) further bake-out/conditioning cycle in lab.

Full re-bake-out/conditioning needs anyway to be done in tunnel (mount heating jackets)

Every bake-out involves a risk; possible ageing effect from prolonged HV conditioning.

Unexpected effects could potentially also arise from transport to LSS.

Install (if possible) equipment which is at least good for the first years of operation.

Use available time before “hard LSS deadline” for measurements

• Magnet calibration (field strength vs. PFN voltage)

• Pulse form, with improved pickups (to confirm or not fast transients at flat top)

Also various investigations in view of possible longer-term solution to be made.

If problems appear in LSS, could inject during sector test with MKI between 0 and 100 % (using other LHC elements, like MCBYV.5R8.B2 and MCBYV.B4R8.B2)

Disposing of a separate vacuum sector is helpful for any later re-fitting.


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LSS8R schedule (draft SCR, doc 703600, 16/2/2006)New version already in preparation …

Basic iteration made with TS/IC, AT/VAC, but also other constraints to be looked at.

Consolidation, communication, ...


TS / IC, K.Foraz

see next page …

today M J JA

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Vacuum schedule (draft)


TS / IC, K.Foraz

AT/VAC, J.M.Jimenez2006 2007

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Protection element TCLIM (LSS8L)

TCLIA

TCLIBTCLIM

D1D2

Q6DFB

beam (ring 2)


• Similar in design to TCDQM (which is for LSS6)

• Will be constructed along with TCDQM (to become available for installation as of October/November 2006)

• For 2nd installation campaign, together with TCLIA/B

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TI 2 + IR2 injection system

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envisaged period ?

2006 2007

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LSS2L

No particular new problems expected for second injection.

Material, procedures, ... should be available and proven by then.

Check on magnet temperatures upon beam impact on certain TCDIs to be finalised: (expected end March).

Followed by final update of TI 2 layout, detailed vacuum layout, ...

Integration ok.

Detailed installation planning still to be made.


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MKQA (LSS4L)

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2006 2007

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MKQA, LSS4L

ECR made, layout defined.

4 magnets not yet built (were last after MKI / MKD / MKB chain to be dealt with).

Do currently not expect problems here:

• Very similar to MKD (uses practically only proven components), different mechanics.

• Less sollicited than MKD.

• Not in vacuum.

Generator prototype under test – ok so far; “series” of other 3 to be built now.

Ceramic vacuum chamber first to be installed on its support (both existing).

No impact (delay) to be expected on vacuum closure.

Installed chamber needs then to be aligned and baked out.

At the end magnet will be installed around it, with own lifting table (a la MKD).

Magnet should also be ready in time for installation, once preparatory work is done.

No 3-month « reliability run » foreseen as for LBDS.


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Summary


Lots of ECRs, ESs published.

No open layout, integration or database issues known w.r.t. LHC V6.501.

For TI 2 still waiting for OK for chosen TCDI positions, to be followed by layout update.

Some concerns over LSS8R ...

• MSI (insertion of vacuum chambers),

• MKI (beam screen),

• TDI (beam screen welding)

Some slippage of certain items but no showstoppers identified for sector test.

No problems visible right now for LSS2L, LSS4L.

Planning to be adapted, resp. detailed plannings to be made.

Still risks (new technical problems, very heavy workload, dependency on suppliers, ...).

Maintain close follow-up and good communication.

lss review: bt injection systems (lss8r(l), 2l(r))): v.mertens + ti’s (lss part)

Documents

vacuum system

vacuum window

vacremaining ti

end of ti

additional vacuum valve

lss regionmbiahmqi

lss review

ab btmkiinjection kickers