|
|
Entry condition |
|
E.A.4.1 |
Machine setup |
.01 |
Nominal injection optics: beta*=11m in IP1 and IP5; beta*=10m in IP2 and IP8 |
.02 |
Nominal tunes if possible (otherwise, need to work on coupling with special optics) |
.03 |
Both beams on central orbit, separation bumps OFF (separation commissioned in A.6) |
.04 |
Coasting
beams (LHC) and Inject&Dump mode (beam for few seconds) |
.05 |
Alternated beam 1 / beam 2 injections |
.06 |
Stable/reproducible
optics and orbit [specify requirements] |
.07 |
Reproducible injected beams shot by shot [specify requirements] |
.08 |
Chromaticity under control [specify requirements] |
.09 |
Alignment
optics for D1/D2 transfer function check prepared [low priority!] |
.10 |
Some measurements could require two beams simultaneously (repeat after Phase A.6):
(1) Orbit/optics correction in the common regions; (2) D1/D2 transfer function checks; (3) Parallel separation bumps. |
|
E.A.4.2 |
Beam requirements |
|
.01 |
Both circulating beams with lifetime larger than ~ 1h |
|
.02 |
Single bunches only |
|
.03 |
Intensities up to a few 1e10 protons |
|
Nominal beam
emittance (value agreed for ramping; baseline: 3.5mum) |
|
.05 |
Reproducible
emittance from injectors [specify requirements] |
.06 |
Possibility to inject lower intensities (some 1e9p) to perform measurements with full beam scraping |
|
E.A.4.3 |
RF |
|
.01 |
Fully commissioned for pilot++ intensities (see A.3) |
|
.02 |
Radial steering fully commissioned for generating energy shifts |
|
.03 |
Transverse damper commissioned. Possibility to switch it ON/OFF [keep it off to have 'constant' betatron oscillation amplitudes during measurements with kicked beams] |
|
E.A.4.4 |
Magnet requirements (ring/detectors) |
|
.01 |
COD polarity checked and calibrated with beam, both arcs and IRs |
|
.02 |
Higher order corrector circuits fully HW commissioned. Trimmable from CCC.
- Lattice correctors: coupling (a2), chromaticity (b3), Landau octupoles (b4)
- Spool pieces: sextupole (b3), octupole (b4), decapole (b5)
- MQX correctors: orbit, coupling, dodecapoles (b6) |
.03 |
Appropriate magnetic cycles defined for the various circuits ( Landau octupoles = 0 and degaussed) |
|
.04 |
Experimental and compensator magnets OFF |
|
.05 |
Spectrometers of IP2 and IP8 OFF |
|
.06 |
HW commissioning of steerers for separation/crossing bumps in the IR's |
|
.07 |
Both signs of bumps available |
|
E.A.4.5 |
BI requirements |
|
.01 |
Orbit feedback operational (See A.3.10). Will need to switch it ON/OFF (global and/or local corrections) |
.02 |
BPM system: All monitors polarity checked and calibrated. Expected resolution for single bunches of 1 to a few 10^10p: closed orbit = 10mum; trajectory = 50-100 mum.
- Sum signal available [imposes constraints for the operation with two beams!]
- Synchronized acquisitions with other devices (kickers, wires, ...)
- Turn-by-turn acquisition available
- >1000-turn acquisition, both for position and sum signals |
.03 |
BCT system:
DC BCT's cannot be used at pilot or pilot+ intensities
Measurements must rely on the fastBCT measurements (10% accuracy with 1e10;1% accuracy with 1e11!)
Turn-by-turn acquisitions synchronized to kicker/BPM/wires/BLM |
.04 |
Emittance measurements (only as beam size measurements).
Full commissioning of
- Wire scanners [priority 1]
- Ionization profile monitors (IPM's) [priority 3]
- Synchrotron radiation monitor [priority 2]
- Absolute calibration <~20% for the beam size
|
.05 |
Beam loss monitors (for identification of loss locations)
Signal acquisition for all the available monitors; appropriate display (global + per region/sector)
Movable monitors ready to use |
.06 |
Screens: Emittance measurements in the TL for pulse-to-pulse monitoring |
.07 |
Appropriate software for acquisition/display of the required BI |
|
E.A.4.6 |
Application software |
|
.01 |
YASP steering program (already available):
- Correct and steer the closed orbit
- Correct and adjust single (first) turn (e.g., re-tuning of injection areas after orbit bumps)
- 3- and 4-corrector bumps as a function of time
- Optics model to calculate Dp/p |
|
.02 |
Dedicated automatic application for SLIDING BUMPS (within YASP?) |
|
.03 |
Collimator control software |
|
.04 |
Control, acquisition, display and logging of all required BI (BPM, BCT, BLM, wires, etc...) and devices (tune kickers, aperture kickers, ...)
Simultaneous data taking is crucial! |
|
.05 |
"Aperture database" - Online update for "as-measured" aperture model (location of aperture bottlenecks, bump settings that optimize aperture). |
.06 |
(On-line) optics model to get (propagate) the optics at any longitudinal location
(MAD-X online model or multi-turn application with MAD-X interface) Control software for the AC dipoles, if we want to use them in this phase |
|
E.A.4.7 |
Additional hardware |
|
.01 |
Tune/aperture kickers (done already in Phase A.3) |
|
.02 |
Beam scraping at the SPS (generate "pencil" beams or small emittances) |
|
.03 |
How can we commission a controlled emittance blow up (?) Transverse noise? |
|
.04 |
AC dipoles [Low priority during commissioning at 450 GeV] |
|
E.A.4.8 |
Machine protection requirements |
|
.01 |
As in Phase A.3 - beam intensities will be smaller or equal |