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Message ID: 23     Entry time: Wednesday, May 25, 2011, 14:42
Author: John Wong 
Target Material: UO2/C 
Target Oven W.O#: UCx-heatboat#1 
Source: LP-SIS 
Status: Done 
Subject: Batch#1: UO2/C mixing & carbonization 

Before began the carbonization process, two cameras were setup in the hotlab for monitoring the evaporator and the power supply.  On duty ISAC Ops also helps to monitor on a regular basis and to grab the striptools + cameras (twice/shift) and put this information in the ISAC Logbook with subject header:  "UCx_2011_A 'date time'", for easy search.  


Wed May 25 14:39:31 2011:  UO2/C cast was dried in the fumehood over the weekend.  The cast was pilled off from the coated WD40 glass plate, rolled up and put in a target heating boat (/w TaC coating & sintered).   The boat was wrapped with 3 Ta-heat shields, then installed in the evaporator which is currently being pumped down.

Thu May 26 11:40:06 2011:  Vac @ 1.75e-6 torr, BP @ 0.032T.  TGHT stepped up to 30A/0.092V (panel @ 27A), ; TGHT has been held for over 10 mins, no change in vacuum yet.

Thu May 26 11:46:48 2011: TGHT @ 40A/0.123V (panel @ 37A), Vac 2.3e-6 Torr, BP@0.032T. 

Thu May 26 15:13:19 2011:  TGHT has been at 40A/0.123V for sometime.  Currently, Vac @ 4.39e-5 Torr, BP@ 0.27T.  (See Attachement#1)

Thu May 26 17:28:36 2011:  Auto ramping has begun.  (see attachment#2).  TGHT @ 40.60A, (panel @ 38A), vac @ 3.84 e-5 Torr.  

Wed Jun 1 13:28:58 2011:  TGHT currently at 395A/3.16V, vac @ 4.47e-5 Torr.  Heating sequence changed for the increment from 4.5e-5 Torr to 5.0e-5 Torr. 

Fri Jun 3 09:54:28 2011 :  The organics burnoff and the carbonization process are complete (see Attachment#3 for the striptool).  The cooling process will begin at a rate of 2A/min.  

Tue Jun 14 21:24:41 2011 :  The evaporator was about to be vented by argon on Jun 10 (Fri), but it was found that the argon cylinder was almost empty; a new one was replaced (see Attachment #4: Evaporator_Ar_flow).  After the argon cylinder was replaced,  the evaporator was purged with the gas and the vent valve was connected to the cylinder for venting of the evaporator.  The target oven was removed and stored in the hermetic transfer vessel, then transferred to the glove box.  (See attachment #5: UC2, Note: typo. Should read Ar gas, NOT N2).  The flakes were stored in the jar labelled "Stock# 2011_A", with total weight of 35g. 

Attachment 1: Screen_shot_2011-05-26_at_3.14.00_PM.png  63 kB  Uploaded Thursday, May 26, 2011, 16:16  | Show | Hide all
Attachment 2: auto_ramping.png  45 kB  Uploaded Thursday, May 26, 2011, 18:31  | Show | Hide all
Attachment 3: UCx_2011_A_carbonization.png  30 kB  Uploaded Friday, June 03, 2011, 11:05  | Show | Hide all
Attachment 4: Evaporator_Ar_flow.png  486 kB  Uploaded Tuesday, June 14, 2011, 23:21  | Show | Hide all
Attachment 5: UC2.png  1.336 MB  Uploaded Tuesday, June 14, 2011, 23:22  | Hide | Hide all
UC2.png
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