STUDIES OF ENERGY RECOVERY LINACS AT ... - CASA

More documents

Recommendations

Info

[10] M. Brittan et al., in Proceedings of the 10 th International Conference on High Energy Accelerators, Serpukov, USSR, 1977 (1977), pp. 283–292. [11] C. Lyneis et al., in Proceedings of the Particle Accelerator Conference, San Francisco, CA, 1979 (IEEE, Piscataway, NJ, 1979), pp. 3246–3248. [12] Report Project 87-R-203, Continuous Electron Beam Accelerator Facility (1985). [13] N. Sereno et al., in Proceedings of the Particle Accelerator Conference, Wash- ington, DC, 1993 (IEEE, Piscataway, NJ, 1993), pp. 3246–3248. [14] N. Sereno, Ph.D. thesis, University of Illinois at Urbana-Champaign (1994). [15] G. Krafft and J. Bisognano, in Proceedings of the Particle Accelerator Confer- ence, Chicago, IL, 1989 (IEEE, Piscataway, NJ, 1989), pp. 1256–1258. [16] R. Rohatgi, H. Schwettman, and T. Smith, in Proceedings of the Particle Accel- erator Conference, Washington, DC, 1987 (IEEE, Piscataway, NJ, 1987), pp. 230–232. [17] D. Douglas et al., Technical Note 91-017, Jefferson Laboratory (1991). [18] G. Neil et al., Phys. Rev. Lett. 84 (2000). [19] D. Douglas, Technical Note 01-018, Jefferson Laboratory (2001). [20] C. Tennant et al., in Proceedings of the 11 th Workshop on RF Superconductivity, Travemunde, Germany, 2003 (2003). [21] S. Benson et al., in Proceedings of the Free Electron Laser Conference, Trieste, Italy, 2004 (Comitato Conferenze Elettra, 2004), pp. 229–232. 197
[22] L. Merminga, in Proceedings of the European Particle Accelerator Conference, Lucerne, Switzerland, 2004 (2004), pp. 16–20. [23] A. Todd, Nucl. Instrum. Methods A 557, 36 (2005). [24] C. Hernandez-Garcia et al., in Proceedings of the Particle Accelerator Confer- ence, Knoxville, TN, 2005 (IEEE, Piscataway, NJ, 2005), pp. 3117–3119. [25] M. Liepe and J. Knobloch, Nucl. Instrum. Methods A 557, 354 (2005). [26] J. Bisognano and R. Gluckstern, in Proceedings of the Particle Accelerator Con- ference, Washington, DC, 1987 (IEEE, Piscataway, NJ, 1987), pp. 1078–1080. [27] P. Axel et al., in Proceedings of the Particle Accelerator Conference, San Fran- cisco, CA, 1979 (IEEE, Piscataway, NJ, 1979), pp. 3143–3145. [28] C. Tennant et al., Phys. Rev. ST Accel. Beams 8, 074403 (2005). [29] C. Leemann, D. Douglas, and G. Krafft, Annu. Rev. Nucl. Part. Sci. 51, 413 (2001). [30] R. York and D. Douglas, in Proceedings of the Particle Accelerator Conference, Washington, DC, 1987 (IEEE, Piscataway, NJ, 1987), pp. 1292–1294. [31] Z. Li, Ph.D. thesis, College of William and Mary (1995). [32] D. Douglas, Presentation at CEBAF-ER working group meeting (2003). [33] R. York and C. Reece, in Proceedings of the Particle Accelerator Conference, Washington, DC, 1987 (IEEE, Piscataway, NJ, 1987), pp. 1307–1309. [34] M. Tiefenback, Comments in accelerator physics group meeting (2001). [35] M. Tiefenback, CEBAF ELOG 1140939 (2003). 198
Page 1 and 2:
STUDIES OF ENERGY RECOVERY LINACS A
Page 3 and 4:
DEDICATION To my wife Danielle and
Page 5 and 6:
2 CEBAF with Energy Recovery . . .
Page 7 and 8:
5.2 HOM Power . . . . . . . . . . .
Page 9 and 10:
ACKNOWLEDGMENTS First and foremost
Page 11 and 12:
6.1 Summary of the measured effects
Page 13 and 14:
2.10 Illustration of quadrupole sca
Page 15 and 16:
5.1 Successive frames in time (prog
Page 17 and 18:
6.8 A plot of 1/Qeff versus average
Page 19 and 20:
ABSTRACT An energy recovering linac
Page 21 and 22:
CHAPTER 1 Introduction An increasin
Page 23 and 24:
FIG. 1.1: Schematic of a generic li
Page 25 and 26:
FIG. 1.2: A CEBAF 5-cell cavity wit
Page 27 and 28:
The solution to Eq. (1.3) is U(t) =
Page 29 and 30:
y reducing the impedance of HOMs, a
Page 31 and 32:
Despite its success, this method of
Page 33 and 34:
design parameters, most notably ach
Page 35 and 36:
1.4.2 Machine Optics The second cat
Page 37 and 38:
analytic model elucidates many impo
Page 39 and 40:
CHAPTER 2 CEBAF with Energy Recover
Page 41 and 42:
FIG. 2.1: Energy versus average cur
Page 43 and 44:
FIG. 2.3: Additional hardware insta
Page 45 and 46:
FIG. 2.4: A picture of the energy r
Page 47 and 48:
dipoles and beam diagnostics such a
Page 49 and 50:
FIG. 2.7: Horizontal (red) and vert
Page 51 and 52:
FIG. 2.8: Illustration of the cryom
Page 53 and 54:
linac and θNL is the RF phase. The
Page 55 and 56:
2.4 Transverse Emittance One of the
Page 57 and 58:
where σ2 is the rms beam size meas
Page 59 and 60:
eams. The effects of varying the qu
Page 61 and 62:
FIG. 2.12: A typical wire scan near
Page 63 and 64:
quadratic fit and a multiple regres
Page 65 and 66:
ting the data is difficult. Without
Page 67 and 68:
primary source of error is measurin
Page 69 and 70:
identified, although the phase dela
Page 71 and 72:
TABLE 2.3: Comparison of Twiss para
Page 73 and 74:
the results of the fits. The vertic
Page 75 and 76:
FIG. 2.18: Schematic illustrating t
Page 77 and 78:
FIG. 2.19: The GASK signal measured
Page 79 and 80:
FIG. 2.20: The measured normalized
Page 81 and 82:
CHAPTER 3 The Jefferson Laboratory
Page 83 and 84:
FIG. 3.1: Schematic of the 10 kW FE
Page 85 and 86:
FIG. 3.2: Layout of the DC photocat
Page 87 and 88:
accelerating gradient at the front
Page 89 and 90:
eason for making the endloops achro
Page 91 and 92:
FIG. 3.7: Illustration of path leng
Page 93 and 94:
3.5 Longitudinal Dynamics This sect
Page 95 and 96:
FIG. 3.9: The effect of a thin focu
Page 97 and 98:
Under the constraint that each orde
Page 99 and 100:
form of beam breakup not only occur
Page 101 and 102:
4.1 The Pillbox Cavity Although the
Page 103 and 104:
FIG. 4.2: Electric field (red) and
Page 105 and 106:
where the full 4×4 transfer matrix
Page 107 and 108:
The threshold is inversely proporti
Page 109 and 110:
4.3 BBU Simulation Codes: Particle
Page 111 and 112:
6. The second pass beam bunch then
Page 113 and 114:
which excites it. The BBU instabili
Page 115 and 116:
Equation (4.41) is a dispersion rel
Page 117 and 118:
FIG. 4.4: Output from MATBBU showin
Page 119 and 120:
FIG. 4.5: Setup for measuring cavit
Page 121 and 122:
Consequently, depending on the exte
Page 123 and 124:
The projection of the beam displace
Page 125 and 126:
TABLE 4.1: Experimental measurement
Page 127 and 128:
FIG. 4.10: A plot showing the effec
Page 129 and 130:
these cryomodules. Modes from these
Page 131 and 132:
CHAPTER 5 Experimental Measurements
Page 133 and 134:
threshold current - preferably with
Page 135 and 136:
occurred at approximately 2 mA of a
Page 137 and 138:
FIG. 5.5: FFT of a pure 2106.007 MH
Page 139 and 140:
FIG. 5.6: Illustration to show the
Page 141 and 142:
5.4 Measuring the Threshold Current
Page 143 and 144:
for the HOM-beam system and is deri
Page 145 and 146:
FIG. 5.10: Schematic of the experim
Page 147 and 148:
FIG. 5.12: A plot of 1/Qeff versus
Page 149 and 150:
measured HOMs in zone 3, a BTF meas
Page 151 and 152:
FIG. 5.16: HOM voltage measured fro
Page 153 and 154:
FIG. 5.18: A plot of the three valu
Page 155 and 156:
the beam’s response in regions wh
Page 157 and 158:
CHAPTER 6 BBU Suppression: Beam Opt
Page 159 and 160:
FIG. 6.1: Schematic of a FODO cell
Page 161 and 162:
plane [85]. Equations (6.7) and (6.
Page 163 and 164:
6.2.3 Discussion The method of poin
Page 165 and 166: FIG. 6.3: Beam envelopes (horizonta
Page 167 and 168: FIG. 6.6: Beam position monitor rea
Page 169 and 170: FIG. 6.8: A plot of 1/Qeff versus a
Page 171 and 172: ⎛ ⎞ ⎜ ⎝ 0 0 0 0 0 −1/K 0
Page 173 and 174: FIG. 6.11: A plot of 1/Qeff versus
Page 175 and 176: FIG. 6.12: Threshold current for no
Page 177 and 178: FIG. 6.14: Threshold current utiliz
Page 179 and 180: TABLE 6.1: Summary of the measured
Page 181 and 182: CHAPTER 7 BBU Suppression: Feedback
Page 183 and 184: FIG. 7.1: A schematic of the feedba
Page 185 and 186: FIG. 7.4: A coaxial 3-stub tuner us
Page 187 and 188: All of these considerations are con
Page 189 and 190: FIG. 7.6: Generic layout for a feed
Page 191 and 192: in Section 4.2.1, however, in the p
Page 193 and 194: FIG. 7.7: The threshold current as
Page 195 and 196: FIG. 7.8: Threshold current versus
Page 197 and 198: FIG. 7.10: The threshold current as
Page 199 and 200: CHAPTER 8 Conclusions The work pres
Page 201 and 202: le were experimentally measured. Du
Page 203 and 204: APPENDIX A The Pillbox Cavity Start
Page 205 and 206: FIG. A.1: A pillbox cavity exhibiti
Page 207 and 208: Ez(ρ, φ) = ψ(ρ, φ) = E0Jm(γρ
Page 209 and 210: FIG. B.1: Relationship of the S-par
Page 211 and 212: FIG. C.1: Impedance and frequency o
Page 213 and 214: FIG. C.5: Impedance and frequency o
Page 215: BIBLIOGRAPHY [1] M. Tigner, Nuovo C
Page 219 and 220: [50] C. Hernandez-Garcia et al., in
Page 221 and 222: [79] L. Merminga et al., in Proceed
Page 223 and 224: VITA Christopher D. Tennant Christo
show all

STUDIES OF ENERGY RECOVERY LINACS AT ... - CASA

Create successful ePaper yourself

Delete template?

Save as template?