TRIAC Progress Report - KEK

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is installed in the drift tubes. The achieved effective shunt impedances of the 1st through 4th tanks are 274, 268, 249 and 228 MΩ/m, respectively. From the measured shunt impedances, we figured out the RF powers required for accelerating ions with q/A = 1/9, i.e. 12, 22, 30 and 50 kW for the 1st through 4th tanks, respectively. Magnetic Q-triplet Rf-Coupler L-Tuner Ridge Drift Tube Fig. 2-15. IH view Modifications of cavities: The SCRFQ [2-12] and IH linacs [2-13] primarily have resonant frequencies of 25.5 and 51 MHz, respectively, while the JAEA Super Conducting (SC-) linac has a resonant frequency of 129.8 MHz. We changed the resonant frequency of the RFQ from 25.5 to 25.96 MHz and that of IH from 51 to 51.92 MHz for future’s connection to SC-linac. The resonant frequency of the RFQ was tuned by changing locally interelectrode capacitance and stem (used for supporting the electrodes) inductance. Values of the capacitance and inductance to be changed were well estimated by using an equivalent circuit analysis; with the changed frequency, the accelerating performance of the SCRFQ was shown to be kept except that the beam energy changes from 172 to 178 keV/nucleon. The resonant frequency of the IH linac was tuned by increasing the gap lengths between drift-tubes, that is, by decreasing the capacitance. All drift-tubes were replaced to the modified ones. The gap lengths were determined by model tests after rough estimations by MAFIA calculations. 2-4-2. Performances (obtained before the cavity modifications) Transmission efficiency: The transmission efficiency of the RFQ was measured as a function of the intervane voltage by using N2 + , N + and H2 + beams. Beam currents were 22 Stem
measured with Faraday cups, FC1, FC2 and FC3. FC1 is installed at the entrance, and FC2 at the exit of RFQ. A quadrupole doublet is installed between FC2 and FC3. Under the condition when the magnetic field strength of the quadrupole doublet is sufficient to focus the accelerated ions into FC3, the transmission for the accelerated ions is obtained from I(FC3) / I(FC1). Here, I(FCi) is the beam current from the i-th Faraday cup. The transmission for the drift-through ions (containing unaccelerated ions) is given by I(FC2) / I(FC1). 2-16. Transmission of the RFQ vs. intervane voltage Fig. 2-17. Transmission along the accelerator. The measured transmission is about 90 % at design voltage and agrees well with the simulation by PARMTEQ [2-12]. From Fig. 2-16, it was verified that the intervane voltage is applicable in a very wide range from 109 kV down to 1/14 of that voltage. The transmission efficiencies of the RF/ IH linac were measured along the accelerator 23
Page 1 and 2: TRIAC Progress Report TRIAC collabo
Page 3 and 4: i KEK Progress Report 2011-1 June 2
Page 5 and 6: PREFACE The Tokai Radioactive Ion A
Page 7 and 8: 1. Introduction Following the succe
Page 9 and 10: maximum available beam power for th
Page 11 and 12: container of ion source and uranyl
Page 13 and 14: gaseous and volatile elements (e.g.
Page 15 and 16: = 10.6 m) were 4.5 %, that for 146
Page 17 and 18: with different plasma volumes [2-6]
Page 19 and 20: ECR plasma: We used natural helium
Page 21 and 22: higher efficiency for gaseous eleme
Page 23 and 24: The asymmetric component representi
Page 25 and 26: ut differs from the electron-loss p
Page 27: consumption in the cavity is less t
Page 31 and 32: y turning off the supply of RF powe
Page 33 and 34: Encouraged by the new finding, as t
Page 35: 2-4-4. Development of superconducti
Page 40 and 41: accelerating the radioactive ion be
Page 42 and 43: Fig. 2-29. Photos of the pre-bunche
Page 44 and 45: For the proposed experiment, the po
Page 46: a diagonal direction. The monitors
Page 49: charge state of xenon ions by using
Page 52 and 53: electrode as shown in Fig. 2-40) sh
Page 54 and 55: CO2 (10 %) and 16 kPa, respectively
Page 56 and 57: Although the gain shift of THGEM#3
Page 58 and 59: 3. Experiments at the TRIAC Since t
Page 60 and 61: Fig. 3-1. Schematic view of the det
Page 62 and 63: -element abundances up to the third
Page 64: higher reliability of the experimen
Page 67 and 68: GEM-MSTPC among the accumulated dat
Page 69 and 70: upstream of the pre-buncher, avoidi
Page 72 and 73: The process of nuclear polarization
Page 74 and 75: annealed platinum foil (stopper foi
Page 78 and 79:
the observed CP-violating phenomena
Page 80 and 81:
offline data analysis, about 1-Mega
Page 82 and 83:
Secondary 9 Li ions extracted from
Page 84 and 85:
Fig.3-24. γ ray energy spectra coi
Page 86 and 87:
In the experiments of RNB-J02/03 (S
Page 88 and 89:
atio), a diffusion coefficient was
Page 91 and 92:
Although the data for β-LiAl and
Page 93 and 94:
In the experiment of RNB-K06 ((Spok
Page 95 and 96:
difference spectra, more specifical
Page 97 and 98:
Mass, which is one of the most fund
Page 99:
gamma rays. 111 In, which decays to
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TRIAC Progress Report - KEK

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