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Tuesday 8.6.

Tuesday 8.6. Morning: Finishing BI intensity studies BPM versus beam intensity: orbit reading stable from 10 11 to 3 10 10 . BCT studies with up to 4 nominal bunches  4 10 11 . PLL studies with high intensities. First beam image for Beam 2 V and H from BGI .

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Tuesday 8.6.

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  1. Tuesday 8.6. • Morning: Finishing BI intensity studies • BPM versus beam intensity: orbit reading stable from 1011 to 3 1010. • BCT studies with up to 4 nominal bunches  4 1011. • PLL studies with high intensities. • First beam image for Beam 2 V and H from BGI. • 11:00: Hump studies. • Measuring the beam spectra as function of beam screen cooling (triplet L1 off; triplet R1 off; XL2 off; XR2 off; XL1 off; XL5 off; XR5 off; XL8 off; XR8 off) No obvious differences observed. • 13:00: Preparing for access. • Noisy nQPS board in A21L1 requires replacement. • Noisy reading of temperature at current lead of DFBX.R8 – RD1. • QPS card for RCBXH1.R2 requires replacement. • BLM card change and update of logger and concentrator 8:30 meeting

  2. Tuesday 8.6. • Orbit versus beam intensity: 8:30 meeting

  3. Tuesday 8.6. • BCT for high beam intensities: 8:30 meeting

  4. Tuesday 8.6. • Beam spectra with and without beam screen cooling in triplet IR1: 8:30 meeting

  5. Tuesday 8.6. • First image from BGI monitor for Beam 2: pressure 1e-8, intensity 2e11 8:30 meeting

  6. Tuesday 8.06 • Access issues: • Elevator at PM65 is. After talking with the DSO, it is OK to close the machine and pre-cycle/run. However not access possible to S56 (from Pt 5) or S67 (from Pt 7) until the elevator is fixed. • A large number of circuits (~30) failed the QPS soft reset in S12 • Performed some collimator checks parallel to pre-cycle: sensor readings for the minimum gaps were checked. No indication of a large scale error in collimator gap and position monitoring was found (was triggered by yesterday’s TCP/TDI measurements). • 19:00: Access finished and starting Damper studies • Completed the setting-up of the damper beam position modules for high intensity 1x1011. • High intensity check of the calibration only done in vertical plane for Beam 2: (Beam loss at the end of the shift due to the switching of BPM intensities for B1 while a nominal bunch was in B2). • tested new firmware for multi-bunch operation 8:30 meeting

  7. Tuesday 08.06 • 00:00 : Injection/dump protection studies • Local aperture scan at the BPM.31L5.B1: +14.5 mm. • Repeated yesterday's TDI beam size measurement with two different angles:With an angle of +/-1 mrad anti-parallel for both jaws the beam size and centre up and downstream was measured for different n-sigma settings of the TCP. • In the case of +1 mrad angles the centers are slightly different (150 mm) and the beam size is increased while for the -1 mrad case the measured centers remain and beam size remain unchanged. • 04:00 : Starting RF bunch length studies • Can not change the Beam Mode: stayed with "injection physics beam". • 04:49: Starting the ramp. • 05:08: starting longitudinal emittance blow-up. 8:30 meeting

  8. Tuesday 8.06 • V aperture in Q31L5.B1 (large local shift of orbit , ~2.5 mm, after recovering BPM following last tech stop) – OK now ! 8:30 meeting

  9. Tuesday 8.6. • Longitudinal beam size during ramp: The emittance was blown-up by a factor ~2 from 0.32eVs initial. 8:30 meeting

  10. Tuesday 8.6. • Very clean ramp: no beam losses. 8:30 meeting

  11. Tuesday 8.6. • Left beams at flat top to look at bunch length evolution. 8:30 meeting

  12. Tuesday 8.6. • Longitudinal emittance blow-up at flat top. 8:30 meeting

  13. Wednesday 09.06 • Program for today: • finish Longitudinal blow-up studies during ramp • Transfer line and injection checks • damper studies 8:30 meeting

  14. Wednesday 9.06 • Open Issues. • Elevator at PM65 is. After talking with the DSO, it is OK to close the machine and pre-cycle/run. However not access possible to S56 (from Pt 5) or S67 (from Pt 7) until the elevator is fixed. • A large number of circuits (~30) failed the QPS soft reset in S12 • ELQA needed on one V tap for current lead of RQS.A12.B2 (lost redundancy). • Multiplier tube for abort gap monitor of Beam 1 requires replacement  requires access (but not before the end of the week). • Sector 78 still requires final tests for validation of 10 A/sec ramp rate requires 1-2 h pre-warning and ca. 1 hour without beam). 8:30 meeting

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