Tuesday, May 08, 2012, 07:32

Target oven is filled with 240 discs of SiC/C, and wrapped with 3 Ta-foils.

Tot mass= 31.95g (SiC + C foil + Org)

Tot length packed @ 8.2cm

Target was installed in the chamber yesterday and has been pumped down to low 10e-6 torr.

Increased TGHT to 70A and vacuum is starting to rise, currently at 2.6e-6 Torr.

Max target current = 820A or until there is no further reaction. 

 Tuesday, May 08, 2012, 08:55

Pressue is slowly coming down after heating for a while at 70A. 

Initiated auto heating at 0.5A/min. Parameter set for increasing current if <4.0e-5 torr, and backing off if >5.0e-5 torr.

Wednesday, May 09, 2012, 10:31

 There seems to be a pipe leakage in the ISAC-I B2 level, and the cooling water for the evaporator #1 is connected to the pipe.  

The TGHT was tapped down from 115A, and the p/s was turned off.  The water valve is now shut, and Curtis B. is looking into it.  

Wednesday, May 09, 2012, 13:44

As per Curtis, the drainage pipe was leaky, and it has been fixed. The evaporator is now turned back on.  TGHT was tabbed up to 115A, and has remained at that current for an hour.  The pressure is slowly raising, current at 4.6e-6 Torr.

Wednesday, May 09, 2012, 14:24

Initiated TGHT...

Saturday, May 12, 2012, 23:38 

TGHT is ramping up very slowly (currently at 270A) due to pressure restriction.  It has already taken over 4 days.  (see attachment 1: TGHT 0_270A)

Changed the parameter to <5.0e05 Torr for stepping up in current and >6.0e-5 Torr for backing off current.

 Sunday, May 13, 2012, 20:44

Pressure has started to come down to 3e-6 Torr.  Increased heating rate from 0.5A/min to 1.0A/min.

 Monday, May 14, 2012, 01:09

TGHT has reached to 820A and been holding at that current for about 3hr.  The pressure is coming down steadily, currently at 1.6e-5 Torr.

Asked ISAC OPS (Ed P.) to initial the auto-cool down at 03:00h, at 2A/min.

The target should be ready by 10:00h.

 Monday, May 14, 2012, 10:56

TGHT is now at 0A (see attachment 2).  The chamber is now being vented.  The target will be inspected.

Thursday, May 17, 2012, 12:51 

The target looks good and was tested in the teststand, see https://elog.triumf.ca/TIS/Test-Stand/97

It will be used as SiC#27.