Ballistic with beta* de-squeeze at top energy to reach above 1Km beta in dipoles, to study quadrupolar errors in dipoles. This is specially important in view of HL-LHC D2 b2 errors.
Telescopic for tune jitter measurements with enhanced arcs.
Ballistic with large vertical dispersion.
Half integer tune.
60 degrees arc cell phase advance for HE-LHC (or ⅓ HE-LHC), and for improving knowledge on LHC itself as phase advance samples errors differently and arc sextupoles are factor ~2 weaker (more linear machine): arc errors, MCS shifts + coupling, BPM aberrations (beam signal closer to pure sin).
Experience HL-LHC-like injection optics with beta*=6m (pilots only).
Look at 11 T flux jumps with TbT data, possibly using a new optics with enhanced beta functions.
2 possible experiments with TOTEM to understand the assymetry of the local dispersion in IR5:
Measurements with flat orbit, >60 bunches.
Measurements with ballistic optics.
Non-90 degrees arc cell phase advance to ease correction of errors in the arcs (reduce the knob degeneracy of orbit bumps at sextupoles).
Measure optics at smallest beta* for a long time, looking for an effect as in SKEKB where Final Focus quadrupole strength drifted by 0.01%. https://kds.kek.jp/event/39396/
Try Closed Orbit Distortion optics measurement as in SuperKEKB with 3-6 orbit correctors per plane and orbit fitting.
Tilting triplets to correct local coupling to operate without MQSX.
Switching off MCS and main sextupoles in one arc to evaluate possible (systematic) vertical or horizontal misalignment of dipoles by measuring coupling and beta-beating during the b3 decay. In a previous MD there was a quadratic coupling increase due to the orbit bump in the arc (maybe the one without MS, tbc).
Crazy MD for this, could be shifting the edge of some dipoles up to see change in coupling.
Tilting a triplet quadrupole to check validity of the tilt measurement (with and/or without beam).
Measure bad BPMs with low and high intensities to detect possible issues with the comparator (transistor). Also swap connections between good and bad BPM to identified.
Have one BPM unplugged to detect its noise until next technical stop.
Momentum compaction factor from Qs versus Voltage.
Snap-back with forced 3D oscillations (optics, chroma,...).
Maybe not OMC: 24h pilot at top energy to use damped beam for BSRT resolution measurement.
0.5 um bunch from new injector chain?? Good for optics measurements, BSRT calibration etc.
K-Modulation with Xing angle and OFB off for Leon's Xing angle reconstruction.
Arc K-modulation.
K-modulation in IR4 during the energy ramp.
Reduce to one the DCCTs per circuit with pilot in the machine and ATS optics to see the impact of 2 DCCTs. Michele Martino also proposes increasing in 1ppm the noise of the DCCTs in one or all dipole PCs to see impact on tune jitter.
Commissioning?: Measure amplitude detuning coming from CMS solenoid by having the on and off measurements.
IR non-linear corrector offsets measurement.
Emittance growth from octupoles and chroma.
Amplitude detuning measurement versus crossing angle with b6 corrector on, for 5 crossing angles to evaluate performance of the technique for b6 correction.
Amplitude dependent optics: Dedicated settings at injection as PoP (Thomas & Barbara), alternative techniques in parallel (K-modulation with decohered beams and amplitude dependent segment-by-segment).
IR2 non-linear correction -> Dedicated squeeze for IR2 to allow for good triplet characterization to shed light on b4.
Amplitude detuning in ballistic optics.
ADT for single kicks.
b5 RDTs.
Measurement and correction of a3 RDTs at injection for lifetime optimization (correcting with MSSX and MSS).
Reduce RF voltage to decrease synchrotron tune to limit the emittance blow-up during excitation with driven and natural tunes close to each other.