LHC Sector Test Requirements

Machine configuration & requirements

We will need:

TI2 operational
Injection region fully commissioned
Inner triplet, D1, D2, Q4, Q5 left of IP2 cold, and commissioned to the requisite level.
Alice ready
Inner triplet, D1, D2, Q4, Q5, Q6, Q7, dispersion suppressor right of IP2 cold, and commissioned to the requisite level.
Arc 23 fully commissioned and cold , and commissioned to the requisite level - beam 1 circuits only - where applicable.
Dispersion suppressor plus Q7 and Q6 right of IP3 cold, and commissioned to the requisite level.
DFBs and PICs
BICs

We keep the number of circuits to a minimum.
They will be powered for the most part to 450 GeV level
Cycling can certainly be to a lot less than 5 TeV if necessary. [30% nominal agreed].

Details below...

TI2

TI2 commissioned to the last TED before the LHC in 2008. The additional section between the TED and the LHC septa is relatively simple and will have to be commissioned with beam at the same time as the LHC injection test. The requirements for the transfer line commissioning are well described elsewhere.

The main requirements for the injection test are a stable, well corrected, well matched trajectory with the designated emittance. Orthogonal Steering of injection point will be required. Interlocks/extraction inhibit, from various LHC elements will be required.

IR2 & Injection region

Need:

Septa installed & commissioned, associated power converter, controls, interlocks.
Kickers: installed, baked-out, tested. Controls, timing, pre-pulses, analogue acquisition etc.
Q5, Q4, D2 left of IP2 cold and commissioned.
TDI: commissioned, controls, radiation monitoring
TCDD installed.
D1 and inner triplet left and right: cold and commissioned
Inner triplet multipole compensation probably not needed
Orbit correctors commissioned
Spectrometer magnet compensators - de-commissioned.
Spectrometer magnet OFF

Full list of elements

Magnet circuits left of IP2

Septa inwards [ML2]

Circuit Name	Magnet Type	Description	Needed?
RQ5.L2	MQY	Matching section individually powered Quadrupole	Yes
RQ4.L2	MQY	Matching section individually powered Quadrupole	Yes
RD2.L2	MBRC	Twin Aperture Separation dipole in IR(188mm). D2	Yes
RCBYH5.L2B1	MCBYH	Horizontal corrector	Yes
RCBYHS5.L2B1	MCBYH	Horizontal corrector	Yes
RCBYVS5.L2B1	MCBYV	Vertical corrector	Yes
RCBYV4.L2B1	MCBYV	Vertical corrector	Yes
RCBYVS4.L2B1	MCBYV	Vertical corrector	Yes
RCBYHS4.L2B1	MCBYH	Horizontal corrector	Yes

Inner Triplet right of 8 [XL2]

Circuit Name	Magnet Type(s)	Description	Needed?
RCBXH1.L2	MCBXH	Inner triplet dipole corrector, horizontal	Yes
RCBXH2.L2	MCBXH	Inner triplet dipole corrector, horizontal	Yes
RCBXH3.L2	MCBXH	Inner triplet dipole corrector, horizontal	Yes
RCBXV1.L2	MCBXV	Inner triplet dipole corrector, vertical	Yes
RCBXV2.L2	MCBXV	Inner triplet dipole corrector, vertical	Yes
RCBXV3.L2	MCBXV	Inner triplet dipole corrector, vertical	Yes
RCOSX3.L2		Skew Octupole Corrector	No
RCOX3.L2		Octupole Corrector	No
RCSSX3.L2		Skew Sextupole corrector	No
RCSX3.L2		Sextupole corrector	No
RCTX3.L2		Dodecapole Corrector	No
RD1.L2	MBX	Single aperture separation dipole. D1 in IR2 and IL2	Yes
RQSX3.L2	MQSX	Skew quadrupole corrector (a2) in between Q2 and Q3	Yes
RQX.L2	MQXA, MQXB	Inner Triplet (Q1,Q2,Q3 in series)	Yes

Beam Instrumentation left of 2

BCT before septa,
Screen before and after septa,
Screen before and after kickers,
Screen before TDI.
BPMs and BLMs at agreed positions.
Pickups after D2 and before D1.

ALICE

The final vacuum chamber will be in place
Spectrometer magnet compensation elements de-commissioned. Spectrometer magnet off
Foreseen RAMSES monitors in place

RBLWH.L2.SR8	OFF
RBXWH.R2.SR8	OFF
RBXWSH.R2.SR8	OFF
RBXWSH.L2.SR	OFF

Right of IP2

Injection collimators (TCL) are optional.
Instrumentation as planned

Inner triplet right of IP [XR2]

Circuit Name	Magnet Type(s)	Type	Needed?
RCBXH1.R2	MCBXH	Horizontal corrector	Yes
RCBXH2.R2	MCBXH	Horizontal corrector	Yes
RCBXH3.R2	MCBXH	Horizontal corrector	Yes
RCBXV1.R2	MCBXV	Vertical corrector	Yes
RCBXV2.R2	MCBXV	Vertical corrector	Yes
RCBXV3.R2	MCBXV	Vertical corrector	Yes
RCOSX3.R2		Skew Octupole Corrector	No
RCOX3.R2		Octupole Corrector	No
RCSSX3.R2		Skew Sextupole corrector	No
RCSX3.R2		Sextupole corrector	No
RCTX3.R2		Dodecapole Corrector	No
RD1.R2	MBX	Recombination dipole	Yes
RQSX3.R2	MQSX	Skew Quadrupole Corrector	Yes
RQX.R2	MQXA, MQXB	Inner Triplet (Q1,Q2,Q3 in series)	Yes

Inner triplet quadrupoles as for L2.

1.1.2. Matching section R2 [MR2]

RCBCHS5.R2B1	MCBCH	Dipole Corrector in MCBCA(B,C,D), Horizontal	Yes
RCBCV5.R2B1	MCBCV	Dipole Corrector in MCBCA(B,C,D), Vertical	Yes
RCBCVS5.R2B1	MCBCV	Dipole Corrector in MCBCA(B,C,D), Vertical	Yes
RCBYH4.R2B1	MCBYH	Dipole Corrector in MCBYA(B), Horizontal	Yes
RCBYHS4.R2B1	MCBYH	Dipole Corrector in MCBYA(B), Horizontal	Yes
RCBYVS4.R2B1	MCBYV	Dipole Corrector in MCBYA(B), Vertical	Yes
RD2.R2	MBRC	Twin Aperture Separation dipole in IR(188mm). D2	Yes
RQ4.R2	MQY	Matching section individually powered Quadrupole	Yes
RQ5.R2	MQM	Quadrupole in the insertions (3.4 m)	Yes

Dispersion Suppressor R2

Dispersion Suppressor: Q8, Q9, Q10, Q11, Q12, Q13 commissioned, powered and cold, plus dipole correctors as listed below.

Circuit Name	Magnet Type	Description	Needed?
RQ6.R2	MQM, MQML	Matching section individually powered Quadrupole	Yes
RQ7.R2	MQM	Quad	Yes
RQ8.R2	MQML	Quad	Yes
RQ9.R2	MQM, MQMC	Dispersion suppressor individually powered Quadrupole	Yes
RQ10.R2	MQML	Dispersion suppressor quad	Yes
RQTL11.R2B1	MQTLI	Dispersion suppressor trim quad	Yes
RQT12.R2B1	MQT	Extended D. S. Tuning trim quad	Yes
RQT13.R2B1	MQT	Extended D. S. Tuning trim quad	Yes
RCBCH6.R2B1	MCBCH	Dipole Corrector in MCBCA(B,C,D), Horizontal	Yes
RCBCV7.R2B1	MCBCV	V Corrector	Yes
RCBCH8.R2B1	MCBCH	H Corrector	Yes
RCBCV9.R2B1	MCBCV	V Corrector	Yes
RCBCH10.R2B1	MCBCH	H Corrector	Yes

Full list of elements

Arc 23

Powering: The full complement of magnet circuits is shown in table . Clearly not all of these circuits will be required for the single pass injection test and the potential need for each circuits is indicated in the priority column: 1 is essential, 3 is not needed. Clearly only need beam 1 circuits.

The test is taking place at 450 GeV and the need to push the circuits all the way to top energy will not be required. The effect of cycling the main bends is an option, but the 5 TeV equivalent does not necessarily need to be used as the high point of a magnetic cycle. Clearly the magnets, cryogenics, quench protection system, vacuum system, energy extraction system, interlock systems will have to have been commissioned as planned.

	Magnet Type	Number of circuits/Beam 2	Priority
Main bends	MBA/MBB	1	1
Lattice quadrupoles	MQ	2	1
Skew quadrupoles	MQS	1	1
Lattice sextupoles	MS	4	2
Skew sextupoles	MSS	1	3
Lattice octupoles	MO	2	3
Tuning quadrupoles	MQT	2	1
Sextupole spool pieces	MCS	1	2
Octupole spool pieces	MCO	1	3
Decapole spool pieces	MCD	1	3
Orbit correctors	MCBV/MCBH	24 + 23	1

Beam Instrumentation as planned
One quad, one bend smothered in beam loss monitors
Orbit Corrector list below

Class	Type	Circuit
Main bends	MB	RB.A23
Main quads	MQ	RQD.A23
Main quads	MQ	RQF.A23
Skew quads	MQS	RQS.A23B1
Trim quads	MQT	RQTD.A23B1
Trim quads	MQT	RQTF.A23B1
Sextupoles	MS	RSD1.A23B1
Sextupoles	MS	RSD2.A23B1
Sextupoles	MS	RSF1.A23B1
Sextupoles	MS	RSF2.A23B1
Skew sextupoles	MSS	RSS.A23B1
Lattice octupoles D	MO	ROD.A23B1
Lattice octupoles F	MO	ROF.A23B1
b3 spool	MCS	RCS.A23B1.
Octupole spool	MCO	RCO.A23B1
Decapole spool	MCD	RCD.A23B1

Dump right of IP7

More details here

Dispersion suppressor to Q7 cold and commissioned.
Q6 installed and commissioned
D4, D3, Q5 etc. not installed.
TED installed with appropriate monitoring
Radiation monitors
Additional beam instrumentation
Additional vacuum pipe installed - appropriate monitoring

Circuit Name	Description	Needed?
RQT13.R7B1		Yes
RQT12.R7B1		Yes
RQTL11.R7B1		Yes
RQTL9.R7B1		Yes
RQTL10.R7B1		Yes
RQTR2.R7B1	Dispersion suppressor quad [MQTLI]	Yes
RQTL7.R7B1	Matching Trim Quadrupole [MQTLI Insertion Region Long Trim Quadrupole Inertia Tube Type]	Yes
RQ6.R7B1	Matching cold quadrupole composed of 6 long trim quads in series [MQTLH]	Yes
RCBCH10.R7B1	Corrector	Yes
RCBCV9.R7B1	Corrector	Yes
RCBCH8.R7B1	Corrector	Yes
RCBCV7.R7B1	Corrector	Yes
RCBCH6.R7B1	Corrector	Yes

MQTLH -> 4.5 K (nominal: 400 A, 90 T/m) > 4.5 K (nominal: 400 A, 90 T/m)
MQTLI -> 1.9 K (nominal: 550 A, 125 T)

ARC 23 Orbit Correctors

Horizontal Orbit correctors

RCBH12.R2B1
RCBH12.R7B1
RCBH14.R2B1
RCBH14.R7B1
RCBH16.R2B1
RCBH16.R7B1
RCBH18.R2B1
RCBH18.R7B1
RCBH20.R2B1
RCBH20.R7B1
RCBH22.R2B1
RCBH22.R7B1
RCBH24.R2B1
RCBH24.R7B1
RCBH26.R2B1
RCBH26.R7B1
RCBH28.R2B1
RCBH28.R7B1
RCBH30.R2B1
RCBH30.R7B1
RCBH32.R2B1
RCBH32.R7B1
RCBH34.R2B1

Vertical Correctors

RCBV11.R2B1
RCBV11.R7B1
RCBV13.R2B1
RCBV13.R7B1
RCBV15.R2B1
RCBV15.R7B1
RCBV17.R2B1
RCBV17.R7B1
RCBV19.R2B1
RCBV19.R7B1
RCBV21.R2B1
RCBV21.R7B1
RCBV23.R2B1
RCBV23.R7B1
RCBV25.R2B1
RCBV25.R7B1
RCBV27.R2B1
RCBV27.R7B1
RCBV29.R2B1
RCBV29.R7B1
RCBV31.R2B1
RCBV31.R7B1
RCBV33.R2B1
RCBV33.R7B1

Feedboxes and Power interlock controllers

Powering Subsector	Description	PIC	DFB
A23	Arc 7-8 cryostat (right side) + Match. section	CIPCA.R7
A23	Arc 7-8 cryostat (left side) + Match. section	CIPCA.R2
MR2	Matching section in R2	CIPCM.R2
XR2	Inner triplet in R2	CIPCX.R2
XL2	Inner triplet in L2	CIPCX.L2
ML2	Matching sections in L2	CIPCM.L2

plus 3 beam interlock controllers and injection BIC