nominal and no csr ( r 56-1 = 55 mm, r 56-2 = 59 mm, r 56-3 = 0)
DESCRIPTION
Elegant Tracking. s z 1 = 0.275 mm (post BC1 bunch length). CSR OFF BC3 OFF. Nominal and no CSR ( R 56-1 = 55 mm, R 56-2 = 59 mm, R 56-3 = 0) L1 phase = 21 deg , V 3.9 = 55 MV. s z 1 = 0.275 mm (post BC1 bunch length). ge x 1.0 m m. CSR ON BC3 OFF. ge x 0.45 m m. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Nominal and no CSR ( R 56-1 = 55 mm, R 56-2 = 59 mm, R 56-3 = 0)](https://reader037.vdocuments.net/reader037/viewer/2022103100/56813b9d550346895da4d58d/html5/thumbnails/1.jpg)
Nominal and no CSR (R56-1 = 55 mm, R56-2 = 59 mm, R56-3 = 0)L1 phase = 21 deg, V3.9 = 55 MV
CSR OFFBC3 OFF
Elegant Tracking
sz1 = 0.275 mm (post BC1 bunch length)
![Page 2: Nominal and no CSR ( R 56-1 = 55 mm, R 56-2 = 59 mm, R 56-3 = 0)](https://reader037.vdocuments.net/reader037/viewer/2022103100/56813b9d550346895da4d58d/html5/thumbnails/2.jpg)
Nominal: (R56-1 = -55 mm, R56-2 = -59 mm, R56-3 = 0)L1 phase = -21 deg, V3.9 = 55 MV
gex 1.0 mm
gex 0.45 mm
CSR ONBC3 OFF
sz1 = 0.275 mm (post BC1 bunch length)
![Page 3: Nominal and no CSR ( R 56-1 = 55 mm, R 56-2 = 59 mm, R 56-3 = 0)](https://reader037.vdocuments.net/reader037/viewer/2022103100/56813b9d550346895da4d58d/html5/thumbnails/3.jpg)
New: (R56-1 = -55 mm, R56-2 = -49.6 mm, R56-3 = 0)L1 phase = -23 deg, V3.9 = 56 MV
gex 0.77 mm
gex 0.42 mm
CSR ONBC3 OFF
sz1 = 0.215 mm (post BC1 bunch length)
![Page 4: Nominal and no CSR ( R 56-1 = 55 mm, R 56-2 = 59 mm, R 56-3 = 0)](https://reader037.vdocuments.net/reader037/viewer/2022103100/56813b9d550346895da4d58d/html5/thumbnails/4.jpg)
New: (R56-1 = -55 mm, R56-2 = -35.2 mm, R56-3 = 0)L1 phase = -25 deg, V3.9 = 59 MV
gex 0.69 mm
gex 0.39 mm
CSR ONBC3 OFF
sz1 = 0.140 mm (post BC1 bunch length)
![Page 5: Nominal and no CSR ( R 56-1 = 55 mm, R 56-2 = 59 mm, R 56-3 = 0)](https://reader037.vdocuments.net/reader037/viewer/2022103100/56813b9d550346895da4d58d/html5/thumbnails/5.jpg)
New: (R56-1 = -55 mm, R56-2 = -17 mm, R56-3 = 0)L1 phase = -26 deg, V3.9 = 65 MV
gex 0.55 mm
gex 0.38 mm
CSR ONBC3 OFF
sz1 = 0.090 mm (post BC1 bunch length)
![Page 6: Nominal and no CSR ( R 56-1 = 55 mm, R 56-2 = 59 mm, R 56-3 = 0)](https://reader037.vdocuments.net/reader037/viewer/2022103100/56813b9d550346895da4d58d/html5/thumbnails/6.jpg)
CSR Emittance Growth vs L1 RF phase (i.e., BC1 compression)
BC3 OFF
![Page 7: Nominal and no CSR ( R 56-1 = 55 mm, R 56-2 = 59 mm, R 56-3 = 0)](https://reader037.vdocuments.net/reader037/viewer/2022103100/56813b9d550346895da4d58d/html5/thumbnails/7.jpg)
Parameter L1 j = -21
L1 j = -23
L1 j = -25
L1 j = -26
Post BC1 sz (mm) 0.275 0.215 0.140 0.090BC1 sE/E (rms) 1.4 1.5 1.6 1.8BC1 R56 (mm) 55 55 55 55BC2 R56 (mm) 59.0 49.6 35.2 17.0V3.9-GHz (MV) 55 56 59 65Final gex (mm) 1.0 0.77 0.69 0.55Final gey
(mm) 0.45 0.42 0.39 0.38
Compression Parameters Over L1 RF Phase Scan(~1-kA constant peak current)
![Page 8: Nominal and no CSR ( R 56-1 = 55 mm, R 56-2 = 59 mm, R 56-3 = 0)](https://reader037.vdocuments.net/reader037/viewer/2022103100/56813b9d550346895da4d58d/html5/thumbnails/8.jpg)
Current Profile is Spiked and Sloped – How to Fix It?
?
No CSR
![Page 9: Nominal and no CSR ( R 56-1 = 55 mm, R 56-2 = 59 mm, R 56-3 = 0)](https://reader037.vdocuments.net/reader037/viewer/2022103100/56813b9d550346895da4d58d/html5/thumbnails/9.jpg)
Use Harmonic Voltage to Slope the Current Profile (2nd order chirp)
L1 phase and voltage adjusted also
![Page 10: Nominal and no CSR ( R 56-1 = 55 mm, R 56-2 = 59 mm, R 56-3 = 0)](https://reader037.vdocuments.net/reader037/viewer/2022103100/56813b9d550346895da4d58d/html5/thumbnails/10.jpg)
Use Harmonic Phase to flatten the Current Profile (3rd order chirp)
L1 phase and voltage, as well as 3.9-GHz voltage all adjusted also
![Page 11: Nominal and no CSR ( R 56-1 = 55 mm, R 56-2 = 59 mm, R 56-3 = 0)](https://reader037.vdocuments.net/reader037/viewer/2022103100/56813b9d550346895da4d58d/html5/thumbnails/11.jpg)
Suggested New 100-pC Configuration
No DeChirper
8-m DeChirper
New
Old
No CSR
![Page 12: Nominal and no CSR ( R 56-1 = 55 mm, R 56-2 = 59 mm, R 56-3 = 0)](https://reader037.vdocuments.net/reader037/viewer/2022103100/56813b9d550346895da4d58d/html5/thumbnails/12.jpg)
Parameter symbol old newPost LH Bunch Length, rms (mm) sz0 1.0 1.0L1 Voltage (MV) V1 223 216L1 RF Phase (deg) j1 -21 -12.2L1 mean Gradient (MV/m) G1 14.1* 13.7*HL Voltage (MV) Vh 55 64.9HL RF Phase (deg) jh -165 -150HL mean Gradient (MV/m) Gh 10.6* 12.5*Post BC1 bunch length, rms (mm) sz1 0.275 0.150BC1 energy spread, rms (%) sE1/E1 1.4 1.6BC1 Energy (MeV) E1 250 250BC1 R56 (mm) R56-1 -55 -55BC2 R56 (mm) R56-2 -59.0 -37.5BC2 Energy (GeV) E2 1.6 1.6BC3 R56 (mm) R56-3 0 0
New 100-pC Configuration (12 A 1 kA)?
* 15/16 cavities powered with 98-MeV injector