IPAC2012 - List of Authors (Huang, Huang, Y.T.)

Paper	Title	Page
WEPPD021	Optimization of the Ultra-High Vacuum Systems for the 3 GeV TPS Synchrotron Light Source	2543
	G.-Y. Hsiung, C.K. Chan, C.-C. Chang, C.L. Chen, J.-R. Chen, C.M. Cheng, Y.T. Cheng, S-N. Hsu, H.P. Hsueh, Huang, Y.T. Huang, I.C. Sheng, L.H. Wu, Y.C. Yang NSRRC, Hsinchu, Taiwan
	The Taiwan Photon Source (TPS), a 3 GeV synchrotron light source, provides an ultra-low emittance of electron beam and the consequent extremely high brightness of photons. The vacuum pressure along the beam duct should be ultra-high vacuum (UHV) and even lower for reduction of the impact to the beam from the gas scattering or ion trapping troubles. Most of the outgas comes from the photon stimulated desorption (PSD) back streaming from downstream absorbers during beam operation and large area surface outgas inside the beam duct as well. Due to the anticipate request of the smallest vertical aperture of beam ducts from various insertion devices and the lowest broadband impedance through all the vacuum chambers of electron storage ring, the inner structure design and the surface treatment of vacuum chambers as well as the constraint of the back stream PSD outgas from distributed absorbers and the pumping locations should be optimized to obtain a high quality UHV system for the high stable synchrotron light source through the long period of operation. The optimized design of the vacuum chambers for the TPS will be described.

WEPPD023	Design and Manufacture of TPS BPM Diamond-Edge Gasket	2549
	Huang, Y.T. Huang, C.-C. Chang, C.L. Chen, J.-R. Chen, G.-Y. Hsiung, H.P. Hsueh NSRRC, Hsinchu, Taiwan
	TPS vacuum chamber is oil-free machined and the material is A6061T651 which the Brinell hardness is 95 kg/mm2. Beam position monitors are installed onto the bending chambers, B1 and B2 and the straight chambers, S3 and S4. The diamond-edge gasket was chosen to seal between BPM flange (SS316L) and the vacuum chamber (A6061T651). Easily manufactured, low cost and less clamping force are three main advantages of this diamond-edge gasket. This diamond-edge gasket is made of A1050H14 which has less hardness, 32 kg/mm2 and its surface roughness is well controlled under 0.8 μm because worse surface roughness probably lead to radial leak. Considering differences of thermal expansion between stainless steel and aluminium, SS304 set screws, nuts and washers are chosen to provide axial sealing force. The sealing ability of this diamond-edge gasket is reliable through tens of bake-out experiments. It is reminded that pre-torque should be sufficient to cause plastic deformation of the diamond-edge gasket and re-torque after baking 24hr and cooling down to room temperature is also important to prevent leaks resulting from loss of torque which usually happen at 100oC.

WEPPD024	A Study of Vacuum Pressure in TPS Cells	2552
	L.H. Wu, J.-R. Chen, C.M. Cheng, G.-Y. Hsiung, C.S. Huang, Huang, Y.T. Huang NSRRC, Hsinchu, Taiwan
	Recently, the type-2 and type-3 TPS cells are installed and pumped down into vacuum status. The pumping down curves of the type-2 and type-3cells, including R03, R06, R07, R10, and R11, are recorded after on-site welding and after assembling without leakage, individually. In the R03, R06, R07, R10 cells, the pumping down curve after assembling without leakage is a little higher than that after on-site welding. In those four cells, the pumping down curve after assembling all vacuum components and pumps is similar. However, in the R11 cell, it was found that the pumping down curve after assembling without leakage is almost along that of after on-site welding. The slope of pumping down curve near 1 hour in the R11 cell is -1.52, while that in the R10 cell is -1.39. It means that the vacuum pressure in the R11 cell is apparently improved. It is confirmed that the vacuum chambers are cleaned by the same process and the assembling components are similar. Besides, the photon stopper chambers are all pre-baked to 200 oC for the same time. We try to investigate the residual gas analysis (RGA) data to find the true reasons.

Paper

Title

Page

Optimization of the Ultra-High Vacuum Systems for the 3 GeV TPS Synchrotron Light Source

2543

G.-Y. Hsiung, C.K. Chan, C.-C. Chang, C.L. Chen, J.-R. Chen, C.M. Cheng, Y.T. Cheng, S-N. Hsu, H.P. Hsueh, Huang, Y.T. Huang, I.C. Sheng, L.H. Wu, Y.C. Yang
NSRRC, Hsinchu, Taiwan

The Taiwan Photon Source (TPS), a 3 GeV synchrotron light source, provides an ultra-low emittance of electron beam and the consequent extremely high brightness of photons. The vacuum pressure along the beam duct should be ultra-high vacuum (UHV) and even lower for reduction of the impact to the beam from the gas scattering or ion trapping troubles. Most of the outgas comes from the photon stimulated desorption (PSD) back streaming from downstream absorbers during beam operation and large area surface outgas inside the beam duct as well. Due to the anticipate request of the smallest vertical aperture of beam ducts from various insertion devices and the lowest broadband impedance through all the vacuum chambers of electron storage ring, the inner structure design and the surface treatment of vacuum chambers as well as the constraint of the back stream PSD outgas from distributed absorbers and the pumping locations should be optimized to obtain a high quality UHV system for the high stable synchrotron light source through the long period of operation. The optimized design of the vacuum chambers for the TPS will be described.

WEPPD023

Design and Manufacture of TPS BPM Diamond-Edge Gasket

2549

Huang, Y.T. Huang, C.-C. Chang, C.L. Chen, J.-R. Chen, G.-Y. Hsiung, H.P. Hsueh
NSRRC, Hsinchu, Taiwan

TPS vacuum chamber is oil-free machined and the material is A6061T651 which the Brinell hardness is 95 kg/mm2. Beam position monitors are installed onto the bending chambers, B1 and B2 and the straight chambers, S3 and S4. The diamond-edge gasket was chosen to seal between BPM flange (SS316L) and the vacuum chamber (A6061T651). Easily manufactured, low cost and less clamping force are three main advantages of this diamond-edge gasket. This diamond-edge gasket is made of A1050H14 which has less hardness, 32 kg/mm2 and its surface roughness is well controlled under 0.8 μm because worse surface roughness probably lead to radial leak. Considering differences of thermal expansion between stainless steel and aluminium, SS304 set screws, nuts and washers are chosen to provide axial sealing force. The sealing ability of this diamond-edge gasket is reliable through tens of bake-out experiments. It is reminded that pre-torque should be sufficient to cause plastic deformation of the diamond-edge gasket and re-torque after baking 24hr and cooling down to room temperature is also important to prevent leaks resulting from loss of torque which usually happen at 100oC.

WEPPD024

A Study of Vacuum Pressure in TPS Cells

2552

L.H. Wu, J.-R. Chen, C.M. Cheng, G.-Y. Hsiung, C.S. Huang, Huang, Y.T. Huang
NSRRC, Hsinchu, Taiwan

Recently, the type-2 and type-3 TPS cells are installed and pumped down into vacuum status. The pumping down curves of the type-2 and type-3cells, including R03, R06, R07, R10, and R11, are recorded after on-site welding and after assembling without leakage, individually. In the R03, R06, R07, R10 cells, the pumping down curve after assembling without leakage is a little higher than that after on-site welding. In those four cells, the pumping down curve after assembling all vacuum components and pumps is similar. However, in the R11 cell, it was found that the pumping down curve after assembling without leakage is almost along that of after on-site welding. The slope of pumping down curve near 1 hour in the R11 cell is -1.52, while that in the R10 cell is -1.39. It means that the vacuum pressure in the R11 cell is apparently improved. It is confirmed that the vacuum chambers are cleaned by the same process and the assembling components are similar. Besides, the photon stopper chambers are all pre-baked to 200 oC for the same time. We try to investigate the residual gas analysis (RGA) data to find the true reasons.