Nikita Bernier wrote:

Monday, March 19, 2012, 17:04   Target boat contains 4 BeO pellets with 30% PVB: Sample,   Thickness (mm),   Mass (g),  Density (g/cm3) 1   4.943,  0.9628,  1.265 2  4.930,  0.9685,  1.276 3  4.758,  0.9607,  1.312 4  4.979,  0.9872,  1.288   Target chamber is currently being pumped down. Leak check will be done tomorrow by turning on the cooling water for the heat shield.    Wednesday, March 21, 2012, 18:30 The Evaporator #2 backing pump (IEVAP2BP1) muffler has been connected to the exhaust system. The auto-ramp program has been tested today and works well. Evaporator #2 is now auto-ramping overnight at 1 A/min, up to 500 A, between 5.00e-05 and 6.00e-05 Torr. ISAC ops have been informed of the process and they will include it in their walkaround.

After sintering at up to 500 A (~1000°C), the 4 BeO pellets have shrunk and feel robust. We can manipulate them with tweesers or hands. Also we can drop them from a couple of inches high and they don't break.

One of the pellets rolled to the extremity of the target boat tube and still has black traces from bad sintering on one side.

Sample,  Thickness (mm),  Mass (g),  Diameter (mm),  Density (g/cm3)

1  3.688,  0.7118,  11.231,  1.948

2  3.822,  0.7196,  11.241,  1.897

3  3.810,  0.7037,  11.188,  1.879

4  3.803,  0.7077,  11.269,  1.866

The average thickness before sintering was 4.90 mm. After sintering, 3.78 mm. Thus the average thickness loss is 1.12 mm (22.9%)

The average mass before sintering was 0.9698 g. After sintering, 0.7107 g. Thus the average mass loss is 0.2591 g (26.7%)

The average diameter before sintering was 14.35 mm. After sintering, 11.23 mm. Thus the average diameter loss is 3.12 mm (21.7%)

The average density after sintering is 1.897 g/cm3, compared to the density of BeO (3.01 g/cm3). Thus the pellets have a BeO density of 63.0%.

Evaporator #2 is now off.

Nikita Bernier wrote:

Monday, March 19, 2012, 17:04   Target boat contains 4 BeO pellets with 30% PVB: Sample,   Thickness (mm),   Mass (g),  Density (g/cm3) 1   4.943,  0.9628,  1.265 2  4.930,  0.9685,  1.276 3  4.758,  0.9607,  1.312 4  4.979,  0.9872,  1.288   Target chamber is currently being pumped down. Leak check will be done tomorrow by turning on the cooling water for the heat shield.   * Note: Target a boat is wrapped with a piece of Ta-foil as a heat shield - JW. Wednesday, March 21, 2012, 18:30 The Evaporator #2 backing pump (IEVAP2BP1) muffler has been connected to the exhaust system. The auto-ramp program has been tested today and works well. Evaporator #2 is now auto-ramping overnight at 1 A/min, up to 500 A, between 5.00e-05 and 6.00e-05 Torr. ISAC ops have been informed of the process and they will include it in their walkaround.

 Thursday, March 22, 2012, 00:25

TGHT SETPOINT was ramped up to 266A but the actual p/s current remained at 90A; that was because the voltage was set 1.05V.  (See attachment1: voltage_limiting.jpg). 

Increased TGHT voltage to 20V, and increased the auto-ramping final value from 500A to 1000A (~1780C as previously measured by a pyrometer, see Attachment 2: Temp-Cal vs Measured.jgp)

Thursday, March 22, 2012, 10:17 

TGHT  ramped up at the rate of 1A/min to 534A/8.89V, local @ 525A/8.90V.  Pressure is coming down to low 10e-6. (See attachment 3: TGHT_525A.jpg)

Increased ramping rate to 2A/min until TGHT reaches to 1000A.

Thursday, March 22, 2012, 13:32

A decision was made to stop the TGHT autoramping program, and set the current to 700A, (local at 690A).  The temperature was measured to be around 1780C on the target boat, and

1500C on the Ta-heat shield.  The current remained at that current for about 2 hours before it's ramping down at zero at -10A/min.

Nikita Bernier wrote:

Monday, March 19, 2012, 17:04   Target boat contains 4 BeO pellets with 30% PVB: Sample,   Thickness (mm),   Mass (g),  Density (g/cm3) 1   4.943,  0.9628,  1.265 2  4.930,  0.9685,  1.276 3  4.758,  0.9607,  1.312 4  4.979,  0.9872,  1.288   Target chamber is currently being pumped down. Leak check will be done tomorrow by turning on the cooling water for the heat shield.

 Tuesday, March 20, 2012, 14:35

It was found out that the Evaporator #2 backing pump (IEVAP2BP1) muffler is not connected to the exhaust system.  The sintering process is on hold until the pump is properly setup (see message ID#7 for more details). 

 Tuesday, March 20, 2012, 14:22

The Evaporator #2 backing pump (IEVAP2:BP1) muffler has not connected to the exhaust duct.

 See attachment#1 as to where the muffler should be connected to the exhaust ducting system.  

The Evaporator chamber is currently under vacuum; the BeO sintering process will be pending for now until the backing pump is properly installed. 

(ISAC E-fault 5880) 

 Wednesday, March 21, 2012, 13:55

Edi Dalla Valle is connecting the evaporator backing scroll pump exhaust to the existing nuclear exhaust. (See attachment#2: scroll_pump_exhause.jpg).  A filter is also added between the exhaust line 

to prevent any back flow of oil from the Evaporator #1 backing pump (An oil pump). 

Work is covered under ISAC WP# 2012-03-21-3.

The evaporator is now operational. 

 Monday, March 19, 2012, 17:04

Target boat contains 4 BeO pellets with 30% PVB:

Sample,   Thickness (mm),   Mass (g),  Density (g/cm3)

1   4.943,  0.9628,  1.265

2  4.930,  0.9685,  1.276

3  4.758,  0.9607,  1.312

4  4.979,  0.9872,  1.288

Target chamber is currently being pumped down. Leak check will be done tomorrow by turning on the cooling water for the heat shield. 

Wednesday, March 21, 2012, 18:30

The Evaporator #2 backing pump (IEVAP2BP1) muffler has been connected to the exhaust system.

The auto-ramp program has been tested today and works well.

Evaporator #2 is now auto-ramping overnight at 1 A/min, up to 500 A, between 5.00e-05 and 6.00e-05 Torr.

ISAC ops have been informed of the process and they will include it in their walkaround.

Thursday, March 01, 2012, 14:35

Both the IEVAP2:TBHT and IEVAP2:TGHT maximum current setpoints on the vacuum page (see page: /edl/ievap2_vacuum1.edl) are wrong. 

For IEVAP2:TGHT, the maximum current setpoint should be 1500A (see page: /edl/ievap2tghtcp.edl), not 1000A. 

For IEVAP2:TBHT, the maximum current setpoint should be 500A (see page: /edl/ievap2tbhtcp.edl), not 300A. 

See attachement#1 for grabscreen. 

Fault: 5853

 Tuesday, February 28, 2012, 10:36

Two thermocouples were inserted through the left side of the copper heat shield, see attachment #1.  One thermocouple is attached to the target tube with a Ta-wire, and the other is attached to the back block.

Data gathering: 

1.  Target heater (IEVAP2:TGHT) setpoint current/voltage  

2.  Target heater (IEVAP2:TGHT) readback current/voltage

4.  Tube heater (IEVAP2:TBHT) setpoint current/voltage

3.  Thermocouples voltages & controls' readback (IEVAP2:TCM) 

 Monday, February 13, 2012, 16:21

The Evaporator 2 is now commissioned.  See attachment#1 for the commissioning report or refer to Document #43321.  

Rick mentioned to me that the evaporator is ready for the next steps of the commissioning process.
In the chamber only the target leg heaters have current by-pass clamps on them. 
The ionizer tube heaters do not have them because these lines do not have the same configuration as the others. The current by-pass clamps will 
not fit these lines.

We may not need this for the commissioning, Rick will design and manufacture something  for this when I get back from holiday.

The water is on in all circuits except for the power supply cooling circuit.

Pierre

Evaporator #2 is still under construction.  For further information please contact Jens Lassen.