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
Message ID: 351     Entry time: Saturday, March 11, 2017, 11:58
Author: John Wong 
Target Material: np-SiC 
Target Oven W.O#:  
Source: TARGET BOAT 
Status: Done 
Subject: Thermo test B3 Pellets 

Friday, March 10, 2017, 17:29

Three B3 pellets are loaded into the container for thermo test. 

(see lab book1 Pg 26, 28-30 for more detail about the materials)

Desired temp ~1500C; one long-sheet of Ta foil is used, est 400A. 

Auto ramping 0.5A/min to 300A first.  Check later...


 Saturday, March 11, 2017, 11:58

Increased TGHT from 300A to 350A last night at ramping rate of 0.5A/min.

Tapped up further from 350A to 400A, 6.92V (2.8kW), Temp measured at ~1550C. 

Pressure peaked at 1.5e-6 Torr and coming down when ramping TGHT from 350A to 400A. (see attachment1)

Will remain at the current.  Continue monitoring..


 Monday, March 13, 2017, 01:14

Temp was held at 1550C for about 1.5days. Vac stabilized at 3.08e-7 torr.  TGHT 400A/6.94V.

Initiated cooling at 1A/min. 

Next, Materials inspection.


 Monday, March 13, 2017, 11:24

Target has been at room temp for about 4 hours.  Venting chamber.


 

Attachment 1: heating_curve_900PSI_pellet.JPG  35 kB  Uploaded Saturday, April 01, 2017, 13:53  | Hide | Hide all
heating_curve_900PSI_pellet.JPG
ELOG V2.9.2-2455