Requirement Details
Electron Ion Collider
G-ESR.02
Requirement details, history, relationships and interfaces associated with requirement G-ESR.02
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| Record Date: 01/27/2025 16:43 | |||
| Identifier: | G-ESR.02 | WBS: | 6.04 |
| Date Modified: | TBD: | FALSE | |
| Status Date: | Status: | Approved | |
| Description: | The ESR shall have a depolarization time long enough to ensure an average polarization of 70%, assuming an injected polarization level of 80% and a bunch replacement rate of two bunches per second. | ||
| Comments: | |||
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| F-EIS-HETL.4 | The ESR extraction system shall have another three bump magnets, its own septum magnet and use the strip line injection kicker to extract and replace the circulating bunches. |
| F-ESR-VAC.01 | The ESR 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 horizontal and 5 mm vertical margin to account for expected orbit errors. |
| F-ESR-VAC.02 | The dynamic pressure around the ESR 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.03 | There shall be no pressure bumps in the ESR exceeding (TBD)[Torr] |
| F-ESR-VAC.04 | The ESR 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.05 | The ESR 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 to prevent damage to other components. |
| F-ESR-VAC.06 | The impedance of the entire ESR vacuum system, including the interaction regions in IR06 and IR08, shall allow for the bunch intensities, beam currents, and bunch numbers contained in the Master Parameter Table (MPT). [Document#:EIC-SEG-RSI-005] |
| F-ESR.06 | The ESR shall deliver a spin polarized electron beam with time-averaged polarization of at least 70 percent. |
| F-ESR.07 | The polarization lifetime of the beam in the ESR shall be maximized to maximize time-averaged polarization based on the given replacement frequency and polarization degree of the bunches provided by the injector. |
| F-ESR.08 | The polarization lifetime maximum optimization in the ESR shall be accomplished by proper spin matching which minimizes the spin diffusion. |
| F-ESR.10 | The ESR shall include a system to absorb the energy of bunches which are periodically and continually ejected from the ESR to accommodate freshly polarized bunches. |
| F-ESR.09 | The ESR shall be capable of having all polarized electron bunches in the ring continually replaced while the electron beam is in collision with a hadron beam, thus allowing for arbitrary spin patterns for the collider experiments. |
| F-ESR.11 | The ESR shall be capable of delivering bunches with longitudinal spins to the IP. |
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