Machine time: July 29 10:00-19:00(JT)

Our Fe Beam properties:
	Energy       500 MeV/nucleon (200,400,460 MeV/nucleon also availabel)
	Period       3.3s
	Duration     0.2-1s (unpredictable)
	Intensity    10^3-10^6 c/s:stable
		     <10^3 c/s    :unstable
	Size         circle of 5cm radius

Objective:
	a)Radiation effect on Si tracker (leakage current)
	b)Radiation effect on the readout electronics (latch-up, upset)
	c)Response to a large signal on Si tracker (recovery time)
We will perform Test b at first, then Test c, and finally Test c (TBD).

For test a, we will perform 1, 2, 5, 10 krad (TBD) irradiation on
both (1 0 0) and (1 1 1) orientation.
Since the beam intensity is 10^6-7c/s at the maximum,
it will take several hours to complete the test.
Before and after the irradiation, we measure the leakage current.
The amount of the irradiated beam is estimated by
integrating the current from Si sensor.

For test b,
we intend to adjust the beam intensity a few times 10^3 c/pulse.
	GTFE(or new chip): 1.14*0.2/(pi*5*5)*3*10^3 ~ 10 c/pulse
	GTRC             : 0.43*0.3/(pi*5*5)*3*10^3 ~ 5  c/pulse
We then input the test signal, read the data, and check
whether the bit-upset has occurred or not.
We also monitor the latch-up (A detail of the method has yet to be determined).
The beam intensity is monitored by a plastic scintillator.

For test c,
we reduce the beam intensity about 100 c/pulse and irradiate the beam
on Si sensor.
This corresponds to 0.1-1c/pulse per one strip,
and we monitor
the output signals (preamp output, shaper output, discriminator output)
by oscilloscope.
We also input the test signal to measure the recovery time.

Note:
LET of 500 MeV/nucleon Fe is about 3.5 GeV/cm (in Si), or, 1.5 MeV cm^2/mg.
This is far below the required level of single event latch-up immunity,
20 MeV cm^2/mg
(from "Glast tracker front-end electronics requirements"),
hence we need to place an absorber and reduce the beam energy
if we want to control the LET.
This level, however, correspond to very low energy (about 10 MeV/nucleon)
and such a low energy Fe ion might be stopped by the ACD
(plactic scintillator of 1cm depth).
It is also difficult to obtain such a low energy ion beam,
since the depth of the absorber should be adjucted
with accuracy of about 100um.
This is the reason why we assume 500 MeV/nucleon Fe beam
on Test b in this plan.