Requirement Details
Electron Ion Collider
G-ESR.3
Requirement details, history, relationships and interfaces associated with requirement G-ESR.3
CURRENT RECORD- ARCHIVE RECORDS
- RELATIONSHIPS
- INTERFACES
| Record Date: 09/25/2024 16:11 | |||
| Identifier: | G-ESR.3 | WBS: | 6.04 |
| Date Modified: | TBD: | FALSE | |
| Status Date: | Status: | In Process | |
| Description: | The ESR shall provide electron bunches having the bunch parameters specified in [10]Â | ||
| Comments: | |||
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| F-ESR-ARC.1 | The EIC ESR lattice arc magnet structure shall contain an array of regular FODO cells |
| F-ESR-ARC.2 | The EIC ESR lattice arc magnet structure shall consists of a quadrupole, a sextupole, a bending section, and a dipole corrector in each arc half-cell. |
| F-ESR-ARC.3 | The EIC ESR lattice arc magnet structure shall contain drift spaces between the half cells all of which may beslightly different in each individual arc. To account for small differences in the required average bending radii at the different arc locations. |
| F-ESR-ARC.4 | The bending sections shall contain three individual dipole magnets, referred to as “super-bendsâ€. |
| F-ESR-ARC.5 | The super-bends shall generate additional synchrotron radiation damping to support a large beam-beam parameter of 0.1 and to create the required horizontal design emittance [5.9] when the ESR is operated at energies below 10 GeV. |
| F-ESR-ARC.6 | The polarity of the center bending magnet shall be capable of being wired in reverse to control the beam emittance and to damp the beam. The polarity will be dictated by the beam energy. |
| F-ESR-ARC.7 | The FODO cell shall operate with a horizontal and vertical betatron phase advance of 60 degrees per arc section at beam energies of 10 GeV and below. |
| F-ESR-ARC.8 | The sextupole wiring scheme shall accomadate the required sextupole families needed per arc to create the 60 degree FODO cell phase advance at < 10 GeV. |
| F-ESR-ARC.9 | The FODO cell shall operate with a horizontal and vertical betatron phase advance of 90 degrees per arc section to provide the required horizontal beam emittance [5.9] at 18 GeV. |
| F-ESR-ARC.11 | The vertical emittance in the arc section shall be controlled by appropriate beam orbit manipulations and horizontal-vertical cross coupling. |
| F-ESR-INST.1 | The instrumentation system shall include dual-plane beam position monitors (BPMs) adjacent to specified quadrupoles. |
| F-ESR-INST.2 | The BPMs shall have turn-by-turn orbit measurement capability based on a single, remotely selectable bunch out of the fully filled bunch train to enable injection optimization. |
| F-ESR-INST.3 | The instrumentation system shall include a beam current monitor to measure average beam current |
| F-ESR-INST.4 | The instrumentation system shall include a system to measure individual bunch charges and bunch pattern |
| F-ESR-INST.5 | The instrumentation system shall include a system to measure transverse beam profiles |
| F-ESR-INST.6 | The instrumentation system shall include a system to measure longitudinal beam profiles |
| F-ESR-INST.7 | The longitudinal bunch profile monitor needs turn-by-turn capability based on a single bunch in the fully filled bunch train to allow timing and energy adjustment for injection optimization. |
| F-ESR-INST.8 | The instrumentation system shall include system to measure H & V betatron tunes. |
| F-ESR-INST.9 | The instrumentation system shall facilitate all required feedback systems (slow transverse, longitudinal and transverse bunch-by-bunch) |
| F-ESR-INST.10 | The instrumentation system shall include beam loss monitor system with detectors located only at select regions of the ESR. |
| F-ESR-MAG.1 | The magnets shall meet the requirements defined by the physics lattice. |
| F-ESR-MAG.2 | The magnets shall have the required field quality to meet the operational needs. |
| F-ESR-MAG.3 | The sextupoles shall be sorted into appropriate “families†and powered accordingly. |
| F-ESR-MAG.4 | The “super-bends†in the ARC sections shall consist of two long dipoles on either end of a short dipole. |
| F-ESR-MAG.5 | The good field region of the dipoles shall extend over a horizontal range of at least 4 centimeters in the radial direction, for all operational beam energies from 5 to 18 GeV. This will take into account the orbit changes due to the reverse bends. Confirm the 4cm with Daniel and Scott |
| F-ESR-MAG.6 | All quadrupoles shall be designed to facilitate beam based alignment. |
| F-ESR-MAG.7 | The maximum integrated field strength of the FODO sextupoles needs to be sufficient to provide chromatic correction at all energies from 5 to 18 GeV with two low-beta interaction regions. |
| F-ESR-MAG.8 | The aperture of all magnets shall be large enough to accommodate the ESR vacuum chamber. Add a link to details of vacuum. |
| F-ESR-MAG.9 | The ESR Shall have a conventional orbit corrector scheme, with single-plane correctors located at the respective quadrupoles.The strength of these correctors needs to be chosen to correct for any source of orbit distortion and should have enough margin for beam based diagnostic purposes, Harmonic Spin bumps,emittance generating bumps. |
| F-ESR-MAG.10 | The two types of dipole magnets in the regular arc cells, the long dipole and the short one, shall be organized into two logical power circuits capable of being optimized subject to the physical power scheme used. |
| F-ESR-MAG.11 | The main arc quadrupoles shall be powered to accommodate the Lattice requirements having the appropriate number of circuits to power the focusing and defocusing quadrupoles in each sextant of the ESR. |
| F-ESR-MAG.12 | The quadrupoles in the straight sections IR10, IR12, IR2, and IR4 and in the transition from the arc to the straight section structure shall be wired to provide the optimized betatron phase advance across each straight section, as required for dynamic aperture optimization. |
| F-ESR-MAG.13 | The quadrupoles shall all be capable of being individually varied by a ~1% indivudally for beam based alignment purposes |
| F-ESR-MAG.14 | The sextupole power supply scheme shall be laid out such that the sextupole family structure can be configured for both the 60 and the 90 degree lattice along with a small number of individually powered sextupoles in the transition regions between arcs and straight sections with minimal effort, cost and minimizing any risk of error. |
| F-ESR-PS.1 | The ESR magnets shall be fed by a system of power supplies matched in voltage and maximum current to the specifications and requirements of the respective magnets |
| F-ESR-PS.2 | The ESR magnet power supply’s shall be capable of providing the stability the ESR needs to operate |
| F-ESR-RF.1 | Provision shall be made at IR10 to accommodate RF systems. |
| F-ESR-RF.2 | The RF system shall be capable of restoring a maximum synchrotron radiation power loss of 10 MW to the beam. |
| F-ESR-RF.3 | The total RF power provided by the RF amplifiers shall be chosen such that all power losses due to synchrotron radiation and other losses created by the stored electron beam can be compensated. |
| F-ESR-RF.4 | The RF system shall provide sufficient voltage to provide a bucket height of at least 10 times the rms energy spread of the beam. |
| F-ESR-RF.5 | The RF system shall provide sufficient gradient to allow installation of all necessary cavaties in the allocated beamline space in IR 10. |
| F-ESR-RF.6 | The superconducting RF system shall allow storage of electron bunches in a 1260 bunch pattern; 1160 buckets will actually be filled with beam while the remaining empty 100 buckets serve as the ion clearing and beam abort gap |
| F-ESR-RF.7 | The RF system resonant frequency of the cavities shall be chosen to accommodate the bunch patterns, subject to coordination with the hadron ring. |
| F-ESR-RF.8 | The RF system controls shall be designed to handle the transient beam loading for all necessary bunch patterns. |
| F-ESR-RF.9 | The HSR Ring RF system shall provide controls and diagnostics for all cavity and system functionality. |
| F-ESR-STRAIGHT.1 | The phase advance of each straight section shall be tunable in order to optimize the dynamic aperture of the ESR. |
| F-ESR-STRAIGHT.2 | The straight sections IR2,4,10 and 12 shall be based on FODO cells. |
| F-ESR-STRAIGHT.3 | There shall be matching sections at the ends of each of the straight sections to compensate for the different FODO cell lengths wrt the arc FODO cells imposed by geometric constraints. |
| F-ESR-VAC.1 | The vacuum chamber shall provide sufficient horizontal and vertical aperture to accommodate; a +/-15 sigma beam, where the vertical RMS beam size is based on the emittance of a fully coupled beam, plus an additional 10 mm horizontally and 5 mm vertically margin to account for expected orbit errors. |
| F-ESR-VAC.2 | The dynamic pressure around the ring shall be consistent with a beam gas lifetime of >10[hrs] with the design currents after an integrated beam current of 1000 [A.h]. |
| F-ESR-VAC.3 | There shall be no pressure bumps in the ring exceeding (TBD)[Torr] |
| F-ESR-VAC.4 | The vacuum chamber and all its components shall be designed to withstand a total synchrotron radiation load of 10 MW, considering the uneven linear load particularly related to the super-bends. |
| F-ESR-VAC.5 | The vacuum chamber material shall be chosen such that the SR power can be intercepted by the arc chambers and in addition good radiation shielding will be provided. |
| F-ESR-VAC.6 | The impedance of the entire ESR vacuum system, including the interaction regions in IR 6 and IR 8, shall allow for the bunch intensities, beam currents, and bunch numbers contained in [5.9]. |
| F-ESR.1 | The ESR lattice shall provide a minimum dynamic aperture of 10 sigma w.r.t Gaussian electron beam distribution in all three dimensions, horizontal, vertical, and longitudinal. With the vertical emittance being half the horizontal design emittance. |
| F-ESR.2 | The minimum dynamic aperture shall be achieved in two optics configurations (60 and 90 degrees betatron phase advance per FODO cell) at all operational beam energies as per [5.9], and with one and with two low-beta insertions. |
| F-ESR.12 | The ESR Lattice shall contain provisions for correctors such as skew quadrupoles, Dipole correctors etc. as needed. |
This function not yet implemented.