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Analysis of Pressure and Temperature Variations at TDI During Fill 2219

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This report examines the pressure behavior at TDI, highlighting a characteristic increase linked to heating. Following fill 2219 on October 16, the TDI gap was expanded from 22 mm to 55 mm in the parking position, resulting in pressure stabilizing within the low 10^-8 mbar range across fills 2218 to 2234. Additionally, temperature data gathered from thermocouples installed on TDI and TCTVB during TS4 (week 35) demonstrates correlations between pressure and temperature variations. Detailed measurements and observations are critical for optimizations in operational practices.

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Analysis of Pressure and Temperature Variations at TDI During Fill 2219

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  1. TDI with large gaps V. Baglin (21/10/11) CERN TE-VSC, Geneva 1. 2. 3. 4.

  2. Pressure history • The pressure at TDI exhibit a pressure increase characteristic of heating • Since fill 2219 (16/10, PM), the TDI gap was increased in parking position from 22 mm to 55 mm • As a result, the pressure stays in the few 10-8 mbar range

  3. Fills 2218-19-20-21-22 • The pressure at TDI exhibit a pressure increase characteristic of heating • Since fill 2219 (16/10, PM), the TDI gap was increased in parking position from 22 mm to 55 mm • As a result, the pressure stays in the few 10-8 mbar range

  4. Fills 2218 to 2234 • The pressure at TDI exhibit a pressure increase characteristic of heating • Since fill 2219 (16/10, PM), the TDI gap was increased in parking position from 22 mm to 55 mm • As a result, the pressure stays in the few 10-8 mbar range or bellow for lower values of beam current

  5. TDI8R – Pressure and Temperature • The pressure at TDI exhibit a pressure increase characteristic of heating • Since fill 2219 (16/10, PM), the TDI gap was increased in parking position from 22 mm to 55 mm • As a result, the pressure stays in the few 10-8 mbar range but the temperature increase remains 2219

  6. TDI8R – Pressure and Temperature • The pressure at TDI exhibit a pressure increase characteristic of heating • Since fill 2219 (16/10, PM), the TDI gap was increased in parking position from 22 mm to 55 mm • As a result, the pressure stays in the few 10-8 mbar range but the temperature increase remains 2222 2219

  7. TS4-2011 • During the TS 4, wk 35, the TDI.8R and TCTVB.8R were equipped with thermocouples • TC1 and TC2 are located on TCTVB.8R • TC 4 and TC11 are located are located on TDI.8R transitions • TC5,6,9 and 10 are located on TDI.8R extremity • TC 7,8 are located at the centre of TDI.8R • TC3 and TC12 are located at reference vacuum chambers NEG coated. • Pressure is measured at TDI by VGPB.231.4R8.X

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