Requirement Details
Electron Ion Collider
G-HSR.22
Requirement details, history, relationships and interfaces associated with requirement G-HSR.22
CURRENT RECORD- ARCHIVE RECORDS
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| Record Date: 12/06/2024 11:10 | |||
| Identifier: | G-HSR.22 | WBS: | 6.05 |
| Date Modified: | TBD: | FALSE | |
| Status Date: | Status: | In Process | |
| Description: | The HSR shall have a cryogenic system to cool and operate all elements which need cryogenic cooling and will, where possible utlise the existing RHIC cooling system. | ||
| Comments: | |||
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| F-HSR-INJ.2 | Hadron ring injection system, consisting of the transport beamline, septum magnet and injection kickers, shall be capable of transporting the 23.8 GeV proton bunch coming from the ATR line to IR4 central area and injecting it into the HSR. |
| F-HSR-INJ.4 | The cryogenic distribution system shall be modified to tie into the 5 o’clock Q10 (05BQ10) quadrupole. |
| F-HSR-SNAK.9 | The orientation of the magnetic field at the helical magnet entrance shall be vertical. |
| F-HSR-SNAK.15 | One additional snake shall be placed between Q7 and Q8 in sector 7 of the 8 o’clock area. |
| F-HSR-SNAK.17 | An interface with the cryogenic system shall be provided for each Snake at their location. |
| F-HSR-STR_IR04.2 | IR4 HSR modifications shall provide sufficient aperture for the injected and circulating beam. |
| F-HSR-STR_IR08.1 | The HSR IR8 modifications shall be performed in the area between Q10 quadrupoles on 7 and 8 o’clock side. |
| F-HSR-STR_IR10.4 | The switching magnet added into the HSR IR10 straight drift near the 9 o’clock triplet assembly shall leave enough space for the hadron SRF cavity. |
| F-HSR-STR_IR12.5 | The DX and D0 in IR12 HSR magnets shall be removed and a new warm switching magnet added. |
| F-HSR-VAC-BS.1 | All the HSR beam pipes which are at cryogenic temperature, including 41 GeV arc, shall be upgraded in-situ by inserting screens.   |
| F-HSR-VAC-BS.2 | The screens shall reduce the average combined heat load on cryogenic system from resistive beam heating and electron cloud to 0.5 W/m or less, including the worst case of radially shifted orbit. |
| F-HSR-VAC-BS.3 | The beam screen design shall ensure adequate vacuum level & stability for all beam parameters [5.12]. |
| F-HSR-VAC-BS.4 | The beam screens shall operate below 10 K. |
| F-HSR-VAC-BS.5 | Beam screens shall not be required for the cold beam pipe of the hadron injection beamline at the 5:00 blue arc. |
| F-HSR-VAC-BS.6 | Beam screens shall not be required for the warm beam pipe sections of the HSR but other means to inhibit SEY, likely NEG, are required. |
| F-HSR-VAC-BS.7 | Beam screens shall be designed to fit into the HSR round cold beam pipes in all seven HSR arcs. |
| F-HSR-VAC-BS.8 | Beam screens shall be designed to fit into the cold beam pipe of the HSR arc magnets. |
| F-HSR-VAC-BS.9 | Beam screens shall be designed to fit through the cold mass interconnect. |
| F-HSR-VAC-BS.10 | The impedance of the screen design, including the screen with RF finger bellows at the cold mass interconnects shall not exceed the the global impedance budget which has been defined by approved by beam physics . |
| F-HSR-VAC-BS.11 | The beam screens shall be designed to be mechanically resistant to eddy-current forces resulting from a magnet quench. |
| F-HSR-VAC-BS.12 | The beam screen design for the transition-crossing jump quadrupole beam pipes shall enable a magnetic field transition time of 40 ms or faster. |
| F-HSR-VAC-BS.13 | The beam screen fabrication and installation shall be conducted such that the installation process minimizes or eliminates adding particulates to the hadron ring. |
| F-HSR-VAC-BS.14 | All beam screens shall be designed to be removable without negative impact to any HSR components. |
| F-HSR-VAC-BS.15 | All beam screens shall be actively cooled. |
| F-HSR-VAC-BS.16 | The RF finger bellows surface profile design shall be chosen to minimize the impedance as much a possible. |
| F-HSR-VAC-BS.17 | The innermost surface of the RF finger bellows shall suppress electron secondary emission yield (SEY).  |
| F-HSR-VAC-BS.18 | The RF finger bellows shall not interfere with the existing process and magnet bus lines (anti-squirm can)Â |
| F-HSR-VAC-BS.19 | The RF finger bellows design shall also include an RF connection to the beam screen |
| F-HSR-VAC-BS.20 | The RF finger bellows design shall have provisions for mounting 4 BPMs or RF shielded pump ports.  |
| F-HSR-VAC-BS.21 | Stainless steel surfaces exposed to the beam shall be coated with a copper layer to minimize resistive wall heating |
| F-HSR-VAC-BS.22 | The RF finger bellows design shall ensure adequate vacuum level & stability for all beam parameters [5.9]. |
| F-HSR-VAC-BS.23 | The RF finger bellows shall operate at a temperture required to minimise beam heating effects.   |
| F-HSR-VAC-BS.24 | The RF finger bellows fabrication and installation shall be conducted such that the installation process minimizes or eliminates adding particulates to the hadron ring. |
| F-HSR-VAC-BS.25 | The cooling system shall be capable of removing the thermal load generated by resistive beam heating and electron cloud. |
| F-HSR-VAC.1 | The HSR vacuum system shall be modified to accommodate worst case dynamic heat load (0.72 A beam with 290 bunches at 19.8·1010 ppb). |
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