Installation & Replacement

The target installation is a delicate procedure and should be performed only by qualified personnel. A minimum requirement is Radiation Worker II training. Only the first time installation does not require the monitoring of radiation around the pivot area. After the cell has been exposed to the electron beam, any replacement of the cell must be done under strict observation of possible radiation and contamination hazards.

The cells are fragile and under high pressure so they can cause damage not only to exposed skin and eyes, but also hearing. It is therefore important to wear hearing protection in the vicinity of an exposed cell and also to wear protective clothing and a face shield when handling or in the vicinity of someone handling a cell.

In the following we describe the procedure for cell replacement. The procedure applies both to a routine replacement and a replacement after a cell explosion.

• If the replacement of the cell follows the explosion of a previous target, a new $Q$ curve of the pickup coils should be measured. If the pickup coils have deteriorated, they should be replaced as well.

• Prepare the replacement target and, if necessary, a new set of pickup coils. Request Hall access from MCC, and wait for a member from the RADCON team to accompany the group of qualified people authorized to change a target cell.

• The member of the RADCON group will evaluate the radiation level around the target area. If safe levels of radiations are observed, the work can proceed. Otherwise a Radiation Work Permit will have to be written. The member of the RADCON group will either clean up the glass pieces or, after determining that there is no contamination, informs us that we can proceed to clean up the glass pieces.

• All personnel within the target area platform must wear ear protection and a face shield during any access to the inside of the target enclosure.

• Raise the target top assembly support and if necessary remove the scattering windows of the RF enclosure to provide sufficient access to the target. Monitor the radiation level close to the target ladder and oven. Determine what conditions are required to comply with a radiation safe work condition.

• Qualified personnel should proceed to replace the target and align it according to well defined reference lines of the target ladder. The motion of the target and the clearance between the pickup coils should be tested. When finished, the scattering windows of the RF enclosure should be put back in place.

• If an intact target cell was removed, it should be stored in a wooden box with a screwed lid or a metal box specially designed for store target cell. It must be left in the hall with ``Pressurized Glass Cell, Open By Authorized Personnel Only'' warning sign on the box. It can only be removed from the Hall after approval from RADCON.