Logbooks Lab Maintenance Evaporator_1 Evaporator_2 Laser cutter Target Production Test-Stand RH-ISAC RH-Cyclotron RH-Meson Hall RH-Beamlines RH-ARIEL
  Evaporator_2  Not logged in ELOG logo
Entry  Tuesday, May 15, 2012, 12:26, John Wong, SiC, 38481-2, HP-SIS, Done, Re-condition the HP-SIS SiC target 
    Reply  Friday, May 18, 2012, 12:19, Nikita Bernier, SiC, 38481-2, HP-SIS, Done, Re-condition the HP-SIS SiC target autoramp1.pngievap2autoheat1.png
       Reply  Friday, May 18, 2012, 13:17, John Wong, SiC, 38481-2, HP-SIS, Done, Re-condition the HP-SIS SiC target 
          Reply  Tuesday, May 22, 2012, 12:15, Nikita Bernier, SiC, 38481-2, HP-SIS, Done, Re-condition the HP-SIS SiC target TGHT-VAC1.JPGTBHT-VAC1.JPG
             Reply  Tuesday, May 22, 2012, 15:26, John Wong, SiC, 38481-2, HP-SIS, Done, Re-condition the HP-SIS SiC target  
                Reply  Monday, June 11, 2012, 12:26, John Wong, SiC, 38481-2, HP-SIS, Problems, End caps vaporized Photo_2012-06-11_12_06_19_PM.jpg
Message ID: 30     Entry time: Monday, June 11, 2012, 12:26     In reply to: 25
Author: John Wong 
Target Material: SiC 
Target Oven W.O#: 38481-2 
Source: HP-SIS 
Status: Problems 
Subject: End caps vaporized 

John Wong wrote:

Nikita Bernier wrote:

John Wong wrote:

Nikita Bernier wrote:

John Wong wrote:

Tuesday, May 15, 2012, 12:24

The HP-SIS SiC target was made on Nov 03, 2010.  The target consists of 405 discs, 18.5cm in length.  It was sintered in the Evaporator#1. 

This target is going into Evap#2 for re-conditioning.  It is currently being pumped down. 


 

Friday, May 18, 2012, 12:19 

The target is wrapped with only one heat shield.

Evaporator #2 Target Heater is now auto-ramping at 0.5 A/min, up to 820 A, with the maximum voltage limited at 2 V, between 2.00e-05 (Good vacuum) and 3.00e-05 Torr (Bad vacuum). Tube Heater is auto-ramping at 0.5 A/min, up to 230 A, with the maximum voltage limited at 1 V. See attachments.

 Friday, May 18, 2012, 13:15

Increased TBHT voltage to 5V, and TGHT to 15V.  Currently, TBHT =83A, 0.986V, TGHT= 144A, 1.65V, IGP1 = 5.2e-7 Torr, IGP2 = 4.3e-7 Torr. 

Continue ramping up... 


 Tuesday, May 22, 2012, 12:02

TGHT and TBHT were ramped up to 830A/13.65V (local), and 235A/3.85V, respectively.  The target was conditioned over the long weekend.  


 

 Tuesday, May 22, 2012, 12:13

Initiating the cool-down process at 5 A/min.

See archive plots of the Target Heater (Attachment 1) and the Tube Heater (Attachment 2).

 Tuesday, May 22, 2012, 15:24

TGHT/TBHT were ramped down to 0A.  The target has cooled for about 45 min.  All pumps and chillers are off.  The chamber has been vented.


 

 Monday, June 11, 2012, 12:20

After the re-conditioning, the target's end-caps vaporized.  This is something happened before (see elog entries below):

https://elog.triumf.ca/TIS/Evaporator_1/20

https://elog.triumf.ca/TIS/Evaporator_1/22

The caps were removed and yellow crystals were observed. (see attachment#1).

The D-caps will be inserted in both ends and will be re-conditioned again to see if the yellow crystals can be removed at high temperature.


 

Attachment 1: Photo_2012-06-11_12_06_19_PM.jpg  1013 kB  | Show | Show all
ELOG V2.9.2-2455