T R I U M F

OPERATIONS GROUP

CYCLOTRON TANK COOLDOWN PROCEDURES

Revision 19 - 22 June 2012 - Peter Yandon - (original: 24 April 1991)

This document is intended to be used as both instructions and as a checklist for bakeout. The author assumes that anyone using these instructions has a basic knowledge of the location and operation of the devices mentioned herein.

Print the WP file " COOL_DOWN.wpd " , (T:\WPWIN\DOCUMENT\COOL_DOWN.wpd)

INDEX 

1. LOWERING CYCLOTRON TEMPERATURE FOR OPERATION

1.01 RECORD TEMPERATURE OF AL-ALCW SYSTEM
1.02 START COOLDOWN
1.03 MONITOR TEMPERATURES
1.04 MONITOR THREE-WAY VALVE POSITION
1.05 MAINTAIN COOLDOWN RATE
1.06 END COOLDOWN
1.07 START R.F. TRANSMISSION LINE COOLING
1.08 START MAIN MAGNET COIL and BUSS BAR COOLING
1.09 START R.F. BOOSTER COOLING
1.10 START R.F. DEFLECTOR COOLING
1.11 START DEIONIZERS
1.12 SET INTERLOCKS
1.13 CHECK RESONATOR TEMPERATURE SETPOINT
1.14 MONITOR TEMPERATURE
1.15 SET R.F. THERMOCOUPLE WARNING AND TRIP TEMPERATURES
1.16 OPEN NORTH HEAT EXCHANGER
1.17 SET THREE WAY VALVE CONTROL TO NORMAL 2. R.F. BOOSTER COOLING SYSTEM

2.0 OVERVIEW
2.1 START UP
2.2 BAKEOUT
2.3 SHUTDOWN / SYSTEM ISOLATION


1.0 - LOWERING CYCLOTRON TEMPERATURE FOR OPERATION     1.01 - 1.17

Before proceeding, initial checks should be made to see if there are any special instructions (Blue Book notes etc.) in effect before starting the cooldown.

  * * *   DO   NOT   TURN   HEATERS   OFF !   * * *    
(see 1.06)


1.01 - RECORD TEMPERATURE OF AL-ALCW SYSTEM

1.02 - START COOLDOWN The temperature is lowered at a rate of 0.2 C/minute, therefore the time required to lower the temperature to 30.5C, should take 2 hours 27.5 minutes from 60C and 47.5 minutes from 40C.

1.03 - MONITOR TEMPERATURES
1.04 - MONITOR THREE-WAY VALVE POSITION 1.05 - MAINTAIN COOLDOWN RATE 1.06 - END COOLDOWN 1.07 - START R.F. TRANSMISSION LINE COOLING 1.08 - START MAIN MAGNET COIL and BUSS BAR COOLING If the Main Magnet is coming ON immediately , then fully open south heat exchanger valve D-17. If the Main Magnet is staying OFF, then adjust the south heat exchanger valve D-17 as required to maintain the temperature at 30.5 C on XTPAGE "2T"). The Al-ALCW water pump will provide enough heat to keep the temperature up. If D-17 is not left fully open, write up a defeat indicating that it will need to be opened when the Main Magnet is turned on.

1.09 - START R.F. BOOSTER COOLING See section 2.1 for instructions. Write up a defeat if booster cooling is not started.

1.10 - START R.F. DEFLECTOR COOLING 1.11 - START DEIONIZERS 1.12 - SET INTERLOCKS 1.13 - CHECK RESONATOR TEMPERATURE SETPOINT 1.14 - MONITOR TEMPERATURE 1.15 - SET R.F. THERMOCOUPLE WARNING AND TRIP TEMPERATURES

The thermocouples displayed on XTPAGE "2Y" may take up to six hours to cool down below the normal warning and trip levels (which are the same as those set on XTPAGE "2T"). Therefore implementation of this instruction may have to be delayed.


1.16 - OPEN NORTH HEAT EXCHANGER

DO NOT open north heat exchanger valve H-18 until the Main Magnet is ON.

Note : Only one heat exchanger is required to provide sufficient cooling for the Magnet by itself. However both are required for Magnet, R.F. and Trim Coils operation. Therefore if only the main magnet will be on, do not open H-18 until the other systems are ready to be turned on. If H-18 is left closed, write up a defeat indicating so.

1.17 - SET TWV CONTROL TO NORMAL

2.0 - R.F. BOOSTER COOLING SYSTEM     2.1 - 2.3

OVERVIEW

The R.F. booster is cooled by the CU-ALCW system. It is important at all times to prevent condensation from forming on the booster elements. This can happen anytime the tank is not at vacuum, and can happen at a molecular level during bakeout due to temperature difference. Therefore the cooling must be shut off for bakeout. In addition the booster cooling must be on during main R.F. operation as the induced voltages may reach 10kV if the system is detuned from resonance. Therefore the cooling must be on for any R.F. operation.


There are three cooling circuits involved with the R.F. Booster : Upper booster, Lower booster and Coupling Loop. The valves for these circuits are located in the vault basement, on the inside of the north cyclotron shielding support wall, in the vicinity of the booster itself. Both the Upper and Lower cooling loops have flow switches in their return lines. The valves descriptions follow :

A - The Upper and Lower booster supply valves are red handled ball valves located downstream of the red-and-white handled valves off the supply header. *** DO NOT adjust the red-and-white handled valves ***

B - The Upper and Lower booster return valves are blue lever handled gate valves located on the return header.

C - The booster Coupling loop uses red lever handled ball valves for both the supply and return lines. These valves are located about six feet upstream of the previously mentioned valves, on the supply and return headers.

D - The three cooling loops each have an unlabelled drain valve on both the supply and return lines, on the booster side of the supply and return valves. (Note: Upper/Lower Booster Supply drains are on wrong side of shut-off. Drains should not be a concern for bakeout, anyway.)

All supply and return valves MUST BE OPEN for ANY beam or booster operation.


2.1 - START UP

2.10 - Ensure that the water lines are intact.

2.11 - Check and close the six drain valves. (see D above)

2.12 - Set the three return valves to full open position (see B and C above)and check for leaks.

2.13 - Set the booster Coupling loop supply valve fully open (see C above)and check for leaks.

2.14 - Set the Upper and Lower booster supply valves fully open (see A above). Check for leaks.

2.2 - BAKEOUT

During bakeout the entire booster cooling water flow must be stopped (see 2,0 Overview).

To do so, close the three supply valves only (see A and C above).


2.3 - SHUTDOWN / SYSTEM ISOLATION

To stop the water flow in any or all of the cooling loops, close the Supply Valve Only!

To shutdown or isolate any of the three cooling loops (ie. checking for leaks, opening the cooling lines etc.) an additional step (3) is required in comparison to most other water cooling systems.

1, Close the supply valve

2, Close the return valve.

3, OPEN AN ASSOCIATED DRAIN VALVE (thus reducing the pressure on the cooling loop to zero).
For the Upper & Lower Booster, open the drain on the Return line. If the supply side needs to be drained, contact RF personnel for instruction.

DO NOT close a return valve before closing the associated supply valve.

DO NOT close a return valve without immediately opening an associated drain valve.



NOTE: The supply and return valves are "tagged" but not labelled, and the drain valves are not marked in any way.