MEASUREMENT OF PICOSECOND SINGLE BEkM OF
3S MeV T.l\DAI LINAC
T. Ueda, H. KObayashi, .T. Kobayashi, Y. Katsumura
M. Washio,*S. Tagawa,Tabata,*~· Hasegawa*Y. Hosono, J. Tanaka,
I. Sato¥*Nuclear Engineering Research lab. Univ. of 'Ibkyo*Department of Nuclear Engineering, Univ. of 'Ibkyo**National lab. for High Energy Physics
IAbstract

Picosecond single pulse operation of a S-hand linear accelerator at Nuclear
Engineering Research Laboratory of University of 'Ibkyo (in 'Ibkai-mura) has been
carried out fran June in 1977. It was ·reported that the pulse width wasconfinned to be less than 18 ps by using a streak camera (Harnamatsu T. V) . 1 >2 >This paper describes nonitoring system canbined fast detector heads and a sampling oscilloscope (rise time is less than 2S ps). Shapes of picosecond pulses
have been measured by the rronitoring system. The rise time of the pulse shapeand the half width of the pulse were confinood to be less than 30 ps and 60 ps,
respectively. I t was confinned that the satellite could be distingiushed franmain pulse, by. using this nonitoring system.
liMeasurement and Result

Photo-! shows the co-axial line tragets used for nonitoring system.
Fig-1 shows the dependence of response on both detector heads and conecting
cable length. The kind of cables used for nonitoring system were 10D-2V, YF-8Dand seme.,-rigid cable. Photo-2 and Photo-3 show the fine structure pulses ofelectron beam measured by using the GR-air line system with 7. S m and 1 m semirigid conecting cable, respectively. The half width of pulses becanes shorter
with decreasing the cable length. Co-axial line targets with smaller radius
were confinned to have faster response. Photo-4 shows the pulse shape of thepicosecond single pulse measured by using the fast detector head, Type-1 (1.4rrm cp). The satellites can be confinood before the main pulse. Photo-S shows
the pulse shape of the picosecond .single pulse measured by using the n\icrostrip line nonitor. The rise time of the pulse shape and the half width of thepulse were confenned SO ps and 60 ps, respectively. The output voltage~
7.s v.3)4)
Reference(1)Y. Tabata, J. Tanaka, s. Tagawa, Y. Katsumura, T. Ueda, K. Hasegawa .1, Fac.
Eng. of Univ of 'Ibkyo (1978)(2)

Y. Tabata, S. Tagawa, Y. Katsumura, T. Ueda, K. Hasegawa, J. Tanaka
J. Atonic Energy Soc. Japan, 20, 473 (1978)(3)

J. Tanaka, I. Sato, S. Anami, S. Fukuda, H. MatSLll!Oto Y. Tabata,H. KObayashi, S. Tagawa and M. Washio KEK-PREPRIN!'-79-2S Jun. (1979) A/P(4)

M. Washio, S. Fukuda, J. Tanaka, I. Sato, S. Anami, Y. Tabata; H. Kobayashi,
Y. Katsumura, T. Ueda, s. Tagawa KEK Report 79-24 Oct. (1979) P-163-300I'll: Type I ( 1.4 mm 11 l

Coaxial8: Type 2 (6.0 mm~ l : GR-Airlinc ) Type.

1/)

CL..
i=.."'E

a:0: Type 3 (25 mm'2000: 5250~(1002Phot.l Several detector for head
525D, Type-3, Type-2 (GR-airline),
Type-1 from upper part.

~Type334567Cct>l e lemgth (m)B

Fig-1 Dependence of response on both
detector head and connecting cablelength.

Phot.2 Fine Structure pulses
measured by using a GR-air line,d +'·~ 7. 5 m semi -rigid connecting
Ci::LJ_:,l_;;::;Q

Phot.4 Pulse shape of thepicosecond sin~le pulse with small
sat~llites measured by ~sing theType.:.l·co-axial detector head.

Phot.3 Fine structure pulses measured
by using a GR-air line with 1.0 m semirigid connecting cable.

Phot.5 Pulse shape.of the picosecond
single pulse by using the micro.strip
line monitor.

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