MAGNET COOLDOWN PROCEDURE: 
Revised 7/6/10 GLD
Revised 5/21/12 GLD

. stamp log book & fill in all info

. Heat temps should be set to 35/35/35
 
. take RGA data
 
. If ECDC is not running and has been requested before the run, 
begin plenum purging steps now (page 1 and 2 of ECDC procedure) 
while working through the steps below 

. check that upper cover cooling is set to 75% 

. check that lower cover cooling is set to 0% 

. toggle offset update on voltage/current screen of Cryo. 
If offsets dont reset correctly, reset Ross relays and 5V/5A supply 
(note: If ECDC is running, leave tf ross relay disabled)

. check IGT and Mass 40 readings 

. set EF magnet cooling setpoints as follows 

EF1u,l to -175C 
EF2u,l to -167C 
EF3u,l to -169C 
EF4U manual to 25%
EF4L manual to 20%
EFCU&L to -180C 

. set the OH cooling setpoint to -167C

. set LN2 pump to 5.0 psi

. verify that the valves you expect to open do so 

. If ECDC is not running and has been requested before the run, 
continue ECDC procedure now (page 3 through page 8) but skip 
RGA setup on page 3. 

. except for EFCs and EF2s wait until the EF coils are within 10C 
of their setpoints 

. check IGT and Mass 40 readings 

. set TFU, TFV, TFL cooling setpoints to -140C 

. wait until the TF regulates at -140C and verify that there are no 
increases in the machine base pressure or mass 40 on the RGA 

. set TFU, TFV, TFL cooling setpoints to -165C 

. after regulation verify that there are no increases in the machine 
base pressure or mass 40 on the RGA 

. set TFU cooling setpoint to -178C 

. set TFV cooling setpoint to -180C 

. set TFL cooling setpoints to -180C 

. reset i2t system 

. at time of lockup set CC_OUT cooling setpoint to -178C 

. at time of lockup set CC_INS cooling to manual at 40% 

. wait about 1 minute and verify CC_INS pressure is within 0.2 psi of 1.2 psi 

. after first shot set LN2 pump pressure to 8 psi 

. OPTIONAL DEPENDING ON COOLING ISSUES DURING RUN 
--> increase pump speed to 10 psi
--> enable "Enable Quad -162" with time on set to 480 seconds (On cryo_setpoint screen)

. After ECDC is shutdown go to gas Bias screen & toggle "pulse B Main" and verify that it opens

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