10Hz Spectral Lines Joschua Dilly 10Hz Spectral Lines 2

Introduction Ions 50cm Protons 30cm Protons 60/15cm flatoptics Protons at Injection Conclusion Summary 10Hz Spectral Lines 3

Introduction In the context of the luminosity problems in IP2 during the ion runs at the end of 2018, a 10Hz modulation on the beam has been detected to cause additional problems (i.e. beam dumps). This modulation seems to originate in the IP2 triplets. In this study the spectra of some measurements was investigated to see this modulation and extract statistics about it. Furthermore, it was checked if this modulation occurs during proton runs as well. 10Hz Spectral Lines 4

Hints The amplitude A of the modulation is calculated as: A = A f · pk2pk , A Q where • A f is the amplitude of the frequency line • A Q is the amplitude of the tune line • pk2pk is the peak-to-peak value (in mm) of the focusing quadrupoles in the arcs 10Hz Spectral Lines 5

Hints • I added some markers for the 10Hz and the 12Hz onto the pictures. These are only a visual aid and not in any way accurate. 10Hz Spectral Lines 6

Ions 50cm • Date: 2018-11-03 01:38 • FILL#: 7396 • BeamProcess: SQUEEZE-6.37TeV-ATS-1m-50cm-2018 ION V1@270 [END] 10Hz Spectral Lines 7

∼ 10Hz ∼ 12Hz Figure: Beam 1 Frequency Spectrum of horizontal BPMs. File Plane Window Amplitude [mm] Frequency 0 . 85 · 10 − 3 ± 1 . 5 · 10 − 4 8 . 32 · 10 − 3 ± 2 . 85 · 10 − 3 9 . 00 · 10 − 4 ± 3 . 92 · 10 − 5 X Beam1@Turn@2018 11 03@01 38 04 244.sdds 1 . 15 · 10 − 3 ± 1 . 5 · 10 − 4 1 . 66 · 10 − 2 ± 7 . 44 · 10 − 3 1 . 04 · 10 − 3 ± 3 . 64 · 10 − 5 Beam1@Turn@2018 11 03@01 38 04 244.sdds X 10Hz Spectral Lines 8

∼ 10Hz ∼ 12Hz Figure: Beam 1 Frequency Spectrum of vertical BPMs. File Plane Window Amplitude [mm] Frequency 0 . 85 · 10 − 3 ± 1 . 5 · 10 − 4 4 . 15 · 10 − 3 ± 1 . 60 · 10 − 3 9 . 18 · 10 − 4 ± 1 . 33 · 10 − 5 Beam1@Turn@2018 11 03@01 38 04 244.sdds Y 1 . 15 · 10 − 3 ± 1 . 5 · 10 − 4 2 . 31 · 10 − 3 ± 7 . 49 · 10 − 4 1 . 13 · 10 − 3 ± 6 . 72 · 10 − 5 Beam1@Turn@2018 11 03@01 38 04 244.sdds Y 10Hz Spectral Lines 9

∼ 10Hz ∼ 12Hz Figure: Beam 2 Frequency Spectrum of horizontal BPMs. File Plane Window Amplitude [mm] Frequency 0 . 85 · 10 − 3 ± 1 . 5 · 10 − 4 7 . 10 · 10 − 3 ± 3 . 42 · 10 − 3 8 . 48 · 10 − 4 ± 3 . 52 · 10 − 5 Beam2@Turn@2018 11 03@01 35 06 976.sdds X 1 . 15 · 10 − 3 ± 1 . 5 · 10 − 4 2 . 18 · 10 − 2 ± 9 . 78 · 10 − 3 1 . 03 · 10 − 3 ± 1 . 56 · 10 − 5 Beam2@Turn@2018 11 03@01 35 06 976.sdds X 10Hz Spectral Lines 10

∼ 10Hz ∼ 12Hz Figure: Beam 2 Frequency Spectrum of vertical BPMs. File Plane Window Amplitude [mm] Frequency 0 . 85 · 10 − 3 ± 1 . 5 · 10 − 4 2 . 84 · 10 − 3 ± 1 . 12 · 10 − 3 7 . 94 · 10 − 4 ± 0 . 11 · 10 − 5 Beam2@Turn@2018 11 03@01 35 06 976.sdds Y 1 . 15 · 10 − 3 ± 1 . 5 · 10 − 4 2 . 73 · 10 − 3 ± 8 . 67 · 10 − 4 1 . 21 · 10 − 3 ± 7 . 84 · 10 − 5 Y Beam2@Turn@2018 11 03@01 35 06 976.sdds 10Hz Spectral Lines 11

Protons 30cm • Date: 2018-06-16 15:37 • FILL#: 6811 • BeamProcess: RAMP PELP-SQUEEZE-6.5TeV-ATS-1m- 2018 V3 V1 MD1@1210 [END] 10Hz Spectral Lines 12

∼ 10Hz ∼ 12Hz Figure: Beam 1 Frequency Spectrum of horizontal BPMs. File Plane Window Amplitude [mm] Frequency 1 . 00 · 10 − 3 ± 1 . 5 · 10 − 4 5 . 90 · 10 − 3 ± 2 . 61 · 10 − 3 1 . 01 · 10 − 3 ± 2 . 52 · 10 − 5 Beam1@Turn@2018 06 16@15 37 05 144.sdds X 10Hz Spectral Lines 13

∼ 10Hz ∼ 12Hz Figure: Beam 1 Frequency Spectrum of vertical BPMs. File Plane Window Amplitude [mm] Frequency 1 . 00 · 10 − 3 ± 1 . 5 · 10 − 4 1 . 76 · 10 − 3 ± 5 . 08 · 10 − 4 9 . 79 · 10 − 4 ± 6 . 73 · 10 − 5 Beam1@Turn@2018 06 16@15 37 05 144.sdds Y 10Hz Spectral Lines 14

Protons 60/15cm flatoptics • Date: 2018-10-30 13:04 • FILL#: 7391 • BeamProcess: SQUEEZE-6.5TeV-ATS-65cm-60 15cm- 2017 V1 ATSFlat@526 [END] 10Hz Spectral Lines 17

∼ 10Hz ∼ 12Hz Figure: Beam 2 Frequency Spectrum of horizontal BPMs. File Plane Window Amplitude [mm] Frequency 1 . 00 · 10 − 3 ± 1 . 5 · 10 − 4 1 . 28 · 10 − 2 ± 4 . 22 · 10 − 3 1 . 00 · 10 − 3 ± 1 . 85 · 10 − 5 X Beam2@Turn@2018 10 30@13 04 06 462.sdds 10Hz Spectral Lines 20

∼ 10Hz ∼ 12Hz Figure: Beam 2 Frequency Spectrum of vertical BPMs. File Plane Window Amplitude [mm] Frequency 1 . 00 · 10 − 3 ± 1 . 5 · 10 − 4 2 . 45 · 10 − 3 ± 6 . 52 · 10 − 4 1 . 00 · 10 − 3 ± 5 . 92 · 10 − 5 Beam2@Turn@2018 10 30@13 04 06 462.sdds Y 10Hz Spectral Lines 21

Protons at Injection • Date: 2018-04-03 23:06 • FILL#: 6504 Here the conclusion is not conclusive, as different measurements show very different spectra in this region. Hence shown are 4 measurements of Beam 1 horizontal for comparison. 10Hz Spectral Lines 22

∼ 10Hz ∼ 12Hz Figure: Beam 1 Frequency Spectrum of horizontal BPMs. 10Hz Spectral Lines 23

Conclusion 10Hz Spectral Lines 27

Conclusion • Lines around 10Hz are visible in the horizontal spectrum • No lines can be found in the vertical spectrum • often two lines at around 10Hz and 12Hz • the 12Hz line is bigger • sometimes only one line around 11Hz • these lines are visible for Ions and Protons • they are more distinct for Ion optics, especially in Beam 2 10Hz Spectral Lines 28

Summary 10Hz Spectral Lines 29

10Hz Spectral Lines Joschua Dilly 10Hz Spectral Lines 2 - PowerPoint PPT Presentation

10Hz Spectral Lines Joschua Dilly 10Hz Spectral Lines 2 Introduction Ions 50cm Protons 30cm Protons 60/15cm flatoptics Protons at Injection Conclusion Summary 10Hz Spectral Lines 3 Introduction In the context of the luminosity problems

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