TCDI Setup and validation

1. TCDI Setup and validation

2. TCDI Setup • Changed by hand the beta functions in the TRIM application  collimator positions moved to 5 s and position thresholds to ±0.25 s(dump) and ±0.125 s (warning) automatically.

3. TCDI Setup • Changed by hand the beta functions in the TRIM application  collimator positions moved to 5 s and position thresholds to ±0.25 s (dump) and ±0.125 s (warning) automatically. • Energy thresholds set up by hand to 10 s + 1 s (equivalent in mm)

4. Calibration BLM • Close 1 jaw to 1 nominal snom shot the beam onto the collimator  record losses at the near by BLM. 1 s Beam axis

5. Calibration • Close 1 jaw to 1 nominal snom shot the beam onto the collimator  record losses at the near by BLM. • Normalize BLM reading with respect to the extracted beam intensity • Define real beam size sreal(measured emittance, dispersion, nominal Dp/p = 1e-4) • Define the fraction of beam intercepted by the collimator jaw (NORMDIST(snom,beam centre, sreal) )

6. Validation BLM • Knob producing n soscillation in H and V plane for different phases 0-30-60…-360° (the knobs had to be regenerated on the spot because of the change in the optics) 5 s Nominal beam axis 5 s

7. Validation • Knob producing n s oscillation in H and V plane for different phases 0-30-60…-360° (the knobs had to be regenerated on the spot because of the change in the optics) • Oscillations with 5 snom amplitude  look at BLM readings  normalize with respect to the extracted intensity • Convert BLM readings in fraction of beam intercepted • Convert fraction of beam intercepted in amplitude cut in sreal by the collimator jaws (to be added to the amplitude of the applied oscillation)  TCDI aperture in sreal

8. Validation Results Knobs and validation fine for TI2 horizontal and TI8 vertical Should measure ~3 points per phase (4,4.5,5 σ) – here we aimed only at the 5 σ oscillation due to time constraints and previous validation

9. Validation Results • Some problems with: • TI2 vertical knob: 10 s amplitude needed to have ~ 5 mm oscillation (1 s = 0.9 mm) in the TL Recalculated amplitudes

10. Validation Results • Some problems with: • TI2 vertical knob: 10 s amplitude needed to have ~ 5 mm oscillation (1 s = 0.9 mm) in the TL • TI8 horizontal knob: 1.5-2 s amplitude needed to have ~ 5 mm oscillation in the TL Recalculated amplitudes

11. Validation Results • Some problems with: • TI2 vertical knob: 10 s amplitude needed to have ~ 5 mm oscillation (1 s = 0.9 mm) in the TL • TI8 horizontal knob: 1.5-2 s amplitude needed to have ~ 5 mm oscillation in the TL • For 5 mm oscillation (seen in YASP) we see a loss level at the TCDIs as expected from the ‘good’ knobs  validation OK • In principle the validation was redundant since we already measured that the TCDIs at 5 ssettings provide the required protection

12. Injection of 144 Bunches after Setup

13. Injection of 144 Bunches after Setup

14. General Critical Issues • TCDIs are the only protection in case of large trajectory drifts • TCDI setup and validation takes minimum 2-3 shifts • Knob generation is critical and should never be done on the spot • Two people are needed for both procedures • At least two teams covering 8h shifts are needed or at least 8h machine downtime has to be accepted between setup and validation • Automatize as much as possible both procedures • Automatics setup tool will be tested in MD on Wednesday