Stefan, Yuta, Kiwamu

As a part of the 10 W preparation, we searched for the PRM parking beam and re-established the parking position.

After some time of steering PRM, we found it hitting on the in-vac aperture which was attached to the inner ceiling of the HAM2 chamber. We could see it from the left most lower viewport of the east side with an IR viewer. We centered the parking beam on the aperture to re-establish the parking position.

The new parking position for PRM is:

• P = -107
• Y = -5707

With this parking position, I was able to see the beam at the south ceiling viewport with a sensor card. The beam was round which indicated that the beam was not clipped. Indeed, I didn't see any scattered light in HAM2 as far as I looked from the lower side viewports. I took some pictures of the ceiling viewport and its canister. Note that the sensor card attached on the inner wall of the canister was removed after the pictures were taken.

I consulted with Gerardo about possibility of mounting a Kentek beam dump today without removing the lexan plate. However since the beam is so low in the canister with an agressive angle, we agreed that the dump will not fit it without a trick -- the beam is close to the lexan plate and it just hits the guard ring due to its output angle. We need to come up with a better idea to mount a dump.