2023 Special Run Configurations

The planning on this page reflects the best current knowledge and will be regularly updated and changed accordingly. Please consider this when using these parameters for any estimate. In case of doubts do not hesitate to contact the LPC.

VdM scan 1

VdM scan 2

90m run

van der Meer scan ATLAS/CMS

Step

Duration

Experiments activities

Remarks

3b setup fill - 19m optics

as needed

ATLAS
head-on 15 min
crossing angle from 0 to -160 urad
head-on 15 min

Setup fill for orbit cleaning and test of IP1 crossing angle change.

Collisions, but no stable beam will be declared.

Optional: BBA for AFP (2h?) in preparation for low mu fill during VdM2 (requires Stable Beam).

Scans IP1/5 - 19m optics

19h
(plus overhead)

ATLAS	CMS	LHCb
5.5h : ATLAS VdM part 1
	4.5h : CMS VdM part 1
		0.5h : LHCb mini-scan
3.5h : ATLAS VdM part 2
	4.5h : CMS VdM part 2
1h: ATLAS crossing angle test

Filling Scheme:
525ns_138b_136_35_16_8bpi_19inj_noCloseLR_2023.csv

Part 1 and 2 scans should ideally happen in the same fill. If beams are dump during a scan will need to repeat at least that full part

LHCb VELO Ghost charge measurements at start of parts 1 and 2, if possible.

Length Scale Calibration - 19m optics

7h
(plus overhead)

ATLAS	CMS
4h : ATLAS LSC
	2.5h : CMS LSC

Filling Scheme:
525ns_138b_136_35_16_8bpi_20inj_noCloseLR_2023.csv

Can happen in the same fill as the previous one, if the beams are still good.

Calibration transfer fill (140b - low ß* optics)

ATLAS	CMS
2h : immediate beam separation to µ=0.5 after optimisation. AFP insertion	head-on
0.5h: maximal beam separation
1h : µ-scan
5min: maximal beam separation
15min: ß* levelling to 40-50 cm for maximum pile-up
1h : µ-scan
2h : head-on	45min : µ-scan (TBC)

Filling Scheme:
Multi_525ns_140b_140_75_16_8bpi_19inj_2023.csv
ß* levelling to target (40-50cm) only after first µ scan at 120cm

1800b / 2400b - mu variation fill (physics optics)

12h

ATLAS	CMS
15 min: µ-scan setup (separate immediately in IP1 to 3.5 sigma)
2h: ATLAS µ-scan
	2h: CMS µ-scan
30 min: Extended emittance scan	30 min: Extended emittance scan
Long decay of µ (remaining part of fill)	Physics

Filling Scheme:
25ns_1886b_1873_1217_1173_236bpi_12inj_hybrid_2INDIV.csv or 25ns_2358b_2345_1692_1628_236bpi_14inj_hybrid_2INDIV.csv

Normal physics fill

optimal

Back to normal physics data taking

Filling Scheme:
Default 2023 full ring

van der Meer scan ALICE/LHCb

Step

Duration

Experiments activities

Remarks

Scans IP2/8 - 19m optics

24h
(including overhead)

ATLAS	CMS	LHCb	ALICE
very low mu	head-on	1h30min : LHCb part 1 (SMOG-less)
very low mu	head-on	3h30min : LHCb part 2 (VdM, BGI, LS)
very low mu	head-on	4h: LHCb ghost charge	4h: ALICE scan (VdM, LS)

Filling Scheme:
Multi_70b_58_20_22_4bpi_19inj.csv

Scans should ideally happen in the same fill. If beams are dumped during a scan will need to repeat at least that full part

LHCb VELO Ghost charge measurements throughout ALICE scan, if possible.

van-der Meer scan parameters (TO BE CONFIRMED)

Beam parameters for Calibration Transfer fill

Items	Remarks
Filling Scheme	Multi_525ns_140b_140_75_16_8bpi_19inj.csv
Bunch Spacing	525 ns (minimal)
Injections	up to 2 batches of 4 bunches
Emittance in Stable Beams	as during physics fills
Intensity in Stable Beams	around 1.4x10¹¹ ppb
Brightness (bunch intensity / emittance)	as during physics fills

Beam parameters for scans in IP1 and IP5

Items	Remarks
Filling Scheme	525ns_138b_136_35_16_8bpi_20inj_noCloseLR_2023.csv
Bunch Spacing	525 ns (minimal)
Injections	up to 2 batches of 4 bunches
Emittance in Stable Beams	3µm -- tolerable variations: 2.5µm to 3.5µm; some spread O(20%-30%) is welcome
Intensity in Stable Beams	0.8x10¹¹ ppb -- tolerable variations: 0.70x10¹¹ ppb to 0.9x10¹¹ ppb; some spread O(20%-30%) is welcome
Profiles	Preparation for VdM : Gaussian profiles which factorise the beam wrt H and V planes
IP 2 Dipole polarity	+
IP 2 external half crossing angle	145 µrad; internal half crossing angle : -72 µrad --> effective half crossing angle at IP: 73 µrad which is ok for using the ZDC.
Injection Optics	With crossing angle to not have problems with LR interactions when beams are large at injection

Beam parameters for Scans in IP2 and IP8

Items	Remarks
Filling Scheme	Multi_70b_58_20_22_4bpi_19inj.csv
Bunch Spacing	1000 ns (minimal)
Injections	up to 4 batches of 1 bunch ("traditional" VdM schemes)
Emittance in Stable Beams	3µm for LHCb; >3µm for ALICE (second in scan programme)
Intensity in Stable Beams	0.7x10¹¹ - 0.9x10¹¹ ppb in LHCb 0.4x10¹¹ - 0.9x10¹¹ ppb in ALICE (ALICE is second in the scan programme)
Profiles	Preparation for VdM : Gaussian profiles which factorise the beam wrt H and V planes
IP8 beta*	24m
IP8 Dipole polarity	Down, +
IP8 external half crossing angle	-300 µrad; internal half crossing angle : -140 µrad --> effective half crossing angle at IP: -440 µrad.
Injection Optics	With crossing angle to not have problems with LR interactions when beams are large at injection
IP2 beta*	19m
IP2 polarities	+ / + (Dipole and L3 magnet)
IP2 internal crossing angle	-72µrad
IP2 external crossing angle	145 µrad
IP2 effective crossing angle	+73µrad which is ok for using the ZDC

90m run for TOTEM

The high beta run is scheduled to take place after TS1, during which the new T2 detector will be installed, on 25 June 2023.

The squeeze for this fill will be very long (~1h?) and will go to 120m to achieve the optimal pile-up level.

The TOTEM roman pots will be inserted close to the beam, so there will be no stable beam and beam should stay below "SETUP BEAM" limits (3x10¹¹ protons).

Beam parameters for TOTEM run

Items	Remarks
Filling Scheme	3 colliding bunches in IP1/5, 1 non-colliding: Single_4b_3_0_0_1ncol.csv
Emittance in Stable Beams	Ideally 2µm
Intensity in Stable Beams	0.7x10¹¹ ppb
Target pile-up level in T2	µ=0.04-0.1 No offset leveling allowed
Beam crossing in IP5	Zero crossing
Target luminosity	About 1/nb - should take around 6 hours

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