Requirement Details
Electron Ion Collider
G-ESR.2
Requirement details, history, relationships and interfaces associated with requirement G-ESR.2
CURRENT RECORD- ARCHIVE RECORDS
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- INTERFACES
| Record Date: 10/10/2024 14:48 | |||
| Identifier: | G-ESR.2 | WBS: | 6.04 |
| Date Modified: | TBD: | FALSE | |
| Status Date: | Status: | In Process | |
| 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.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.6 | The ESR shall deliver a spin polarized electron beam with time-averaged polarization of at least 70 percent. |
| F-ESR.7 | 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.8 | The polarization lifetime maximum optimization shall be accomplished by proper spin matching which minimizes the spin diffusion. |
| F-ESR.9 | The ESR shall be capable of continuously replacing all polarized electron bunches in the ring while the electron beam is in collision with a hadron beam allowing it to provide arbitrary spin patterns for the collider experiments. |
| F-ESR.10 | The ESRÂ shall include a system to absorb the energy of bunches which are periodically ejected from the ESR to accommodate freshly polarized bunches. |
| F-ESR.11 | The ESR shall be capable of delivering bunches with longitudnal spins to the IP. |
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